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wolfssl/ctaocrypt/src/asn.c

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/* asn.c
*
* Copyright (C) 2006-2011 Sawtooth Consulting Ltd.
*
* This file is part of CyaSSL.
*
* CyaSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* CyaSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef THREADX
#include "os.h" /* dc_rtc_api needs */
#include "dc_rtc_api.h" /* to get current time */
#endif
#include <cyassl/ctaocrypt/asn.h>
#include <cyassl/ctaocrypt/coding.h>
#include <cyassl/ctaocrypt/sha.h>
#include <cyassl/ctaocrypt/md5.h>
#include <cyassl/ctaocrypt/error.h>
#include <cyassl/ctaocrypt/pwdbased.h>
#include <cyassl/ctaocrypt/des3.h>
#include <cyassl/ctaocrypt/sha256.h>
#include <cyassl/ctaocrypt/logging.h>
#ifdef HAVE_NTRU
#include "crypto_ntru.h"
#endif
#ifdef HAVE_ECC
#include <cyassl/ctaocrypt/ecc.h>
#endif
#ifdef _MSC_VER
/* 4996 warning to use MS extensions e.g., strcpy_s instead of XSTRNCPY */
#pragma warning(disable: 4996)
#endif
#ifndef TRUE
enum {
FALSE = 0,
TRUE = 1
};
#endif
#ifdef THREADX
/* uses parital <time.h> structures */
#define XTIME(tl) (0)
#define XGMTIME(c) my_gmtime((c))
#define XVALIDATE_DATE(d, f, t) ValidateDate((d), (f), (t))
#elif defined(MICRIUM)
#if (NET_SECURE_MGR_CFG_EN == DEF_ENABLED)
#define XVALIDATE_DATE(d,f,t) NetSecure_ValidateDateHandler((d),(f),(t))
#else
#define XVALIDATE_DATE(d, f, t) (0)
#endif
#define NO_TIME_H
/* since Micrium not defining XTIME or XGMTIME, CERT_GEN not available */
#elif defined(USER_TIME)
/* no <time.h> structures used */
#define NO_TIME_H
/* user time, and gmtime compatible functions, there is a gmtime
implementation here that WINCE uses, so really just need some ticks
since the EPOCH
*/
#else
/* default */
/* uses complete <time.h> facility */
#include <time.h>
#define XTIME(tl) time((tl))
#define XGMTIME(c) gmtime((c))
#define XVALIDATE_DATE(d, f, t) ValidateDate((d), (f), (t))
#endif
#ifdef _WIN32_WCE
/* no time() or gmtime() even though in time.h header?? */
#include <windows.h>
time_t time(time_t* timer)
{
SYSTEMTIME sysTime;
FILETIME fTime;
ULARGE_INTEGER intTime;
time_t localTime;
if (timer == NULL)
timer = &localTime;
GetSystemTime(&sysTime);
SystemTimeToFileTime(&sysTime, &fTime);
XMEMCPY(&intTime, &fTime, sizeof(FILETIME));
/* subtract EPOCH */
intTime.QuadPart -= 0x19db1ded53e8000;
/* to secs */
intTime.QuadPart /= 10000000;
*timer = (time_t)intTime.QuadPart;
return *timer;
}
struct tm* gmtime(const time_t* timer)
{
#define YEAR0 1900
#define EPOCH_YEAR 1970
#define SECS_DAY (24L * 60L * 60L)
#define LEAPYEAR(year) (!((year) % 4) && (((year) % 100) || !((year) %400)))
#define YEARSIZE(year) (LEAPYEAR(year) ? 366 : 365)
static const int _ytab[2][12] =
{
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};
static struct tm st_time;
struct tm* ret = &st_time;
time_t time = *timer;
unsigned long dayclock, dayno;
int year = EPOCH_YEAR;
dayclock = (unsigned long)time % SECS_DAY;
dayno = (unsigned long)time / SECS_DAY;
ret->tm_sec = dayclock % 60;
ret->tm_min = (dayclock % 3600) / 60;
ret->tm_hour = dayclock / 3600;
ret->tm_wday = (dayno + 4) % 7; /* day 0 a Thursday */
while(dayno >= (unsigned long)YEARSIZE(year)) {
dayno -= YEARSIZE(year);
year++;
}
ret->tm_year = year - YEAR0;
ret->tm_yday = dayno;
ret->tm_mon = 0;
while(dayno >= (unsigned long)_ytab[LEAPYEAR(year)][ret->tm_mon]) {
dayno -= _ytab[LEAPYEAR(year)][ret->tm_mon];
ret->tm_mon++;
}
ret->tm_mday = ++dayno;
ret->tm_isdst = 0;
return ret;
}
#endif /* _WIN32_WCE */
#ifdef THREADX
#define YEAR0 1900
struct tm* my_gmtime(const time_t* timer) /* has a gmtime() but hangs */
{
static struct tm st_time;
struct tm* ret = &st_time;
DC_RTC_CALENDAR cal;
dc_rtc_time_get(&cal, TRUE);
ret->tm_year = cal.year - YEAR0; /* gm starts at 1900 */
ret->tm_mon = cal.month - 1; /* gm starts at 0 */
ret->tm_mday = cal.day;
ret->tm_hour = cal.hour;
ret->tm_min = cal.minute;
ret->tm_sec = cal.second;
return ret;
}
#endif /* THREADX */
static INLINE word32 btoi(byte b)
{
return b - 0x30;
}
/* two byte date/time, add to value */
static INLINE void GetTime(int* value, const byte* date, int* idx)
{
int i = *idx;
*value += btoi(date[i++]) * 10;
*value += btoi(date[i++]);
*idx = i;
}
#if defined(MICRIUM)
CPU_INT32S NetSecure_ValidateDateHandler(CPU_INT08U *date, CPU_INT08U format,
CPU_INT08U dateType)
{
CPU_BOOLEAN rtn_code;
CPU_INT32S i;
CPU_INT32S val;
CPU_INT16U year;
CPU_INT08U month;
CPU_INT16U day;
CPU_INT08U hour;
CPU_INT08U min;
CPU_INT08U sec;
i = 0;
year = 0u;
if (format == ASN_UTC_TIME) {
if (btoi(date[0]) >= 5)
year = 1900;
else
year = 2000;
}
else { /* format == GENERALIZED_TIME */
year += btoi(date[i++]) * 1000;
year += btoi(date[i++]) * 100;
}
val = year;
GetTime(&val, date, &i);
year = (CPU_INT16U)val;
val = 0;
GetTime(&val, date, &i);
month = (CPU_INT08U)val;
val = 0;
GetTime(&val, date, &i);
day = (CPU_INT16U)val;
val = 0;
GetTime(&val, date, &i);
hour = (CPU_INT08U)val;
val = 0;
GetTime(&val, date, &i);
min = (CPU_INT08U)val;
val = 0;
GetTime(&val, date, &i);
sec = (CPU_INT08U)val;
return NetSecure_ValidateDate(year, month, day, hour, min, sec, dateType);
}
#endif /* MICRIUM */
static int GetLength(const byte* input, word32* inOutIdx, int* len,
word32 maxIdx)
{
int length = 0;
word32 i = *inOutIdx;
byte b;
if ( (i+1) > maxIdx) { /* for first read */
CYASSL_MSG("GetLength bad index on input");
return BUFFER_E;
}
b = input[i++];
if (b >= ASN_LONG_LENGTH) {
word32 bytes = b & 0x7F;
if ( (i+bytes) > maxIdx) { /* for reading bytes */
CYASSL_MSG("GetLength bad long length");
return BUFFER_E;
}
while (bytes--) {
b = input[i++];
length = (length << 8) | b;
}
}
else
length = b;
if ( (i+length) > maxIdx) { /* for user of length */
CYASSL_MSG("GetLength value exceeds buffer length");
return BUFFER_E;
}
*inOutIdx = i;
*len = length;
return length;
}
static int GetSequence(const byte* input, word32* inOutIdx, int* len,
word32 maxIdx)
{
int length = -1;
word32 idx = *inOutIdx;
if (input[idx++] != (ASN_SEQUENCE | ASN_CONSTRUCTED) ||
GetLength(input, &idx, &length, maxIdx) < 0)
return ASN_PARSE_E;
*len = length;
*inOutIdx = idx;
return length;
}
static int GetSet(const byte* input, word32* inOutIdx, int* len, word32 maxIdx)
{
int length = -1;
word32 idx = *inOutIdx;
if (input[idx++] != (ASN_SET | ASN_CONSTRUCTED) ||
GetLength(input, &idx, &length, maxIdx) < 0)
return ASN_PARSE_E;
*len = length;
*inOutIdx = idx;
return length;
}
/* winodws header clash for WinCE using GetVersion */
static int GetMyVersion(const byte* input, word32* inOutIdx, int* version)
{
word32 idx = *inOutIdx;
if (input[idx++] != ASN_INTEGER)
return ASN_PARSE_E;
if (input[idx++] != 0x01)
return ASN_VERSION_E;
*version = input[idx++];
*inOutIdx = idx;
return *version;
}
/* Get small count integer, 32 bits or less */
static int GetShortInt(const byte* input, word32* inOutIdx, int* number)
{
word32 idx = *inOutIdx;
word32 len;
*number = 0;
if (input[idx++] != ASN_INTEGER)
return ASN_PARSE_E;
len = input[idx++];
if (len > 4)
return ASN_PARSE_E;
while (len--) {
*number = *number << 8 | input[idx++];
}
*inOutIdx = idx;
return *number;
}
/* May not have one, not an error */
static int GetExplicitVersion(const byte* input, word32* inOutIdx, int* version)
{
word32 idx = *inOutIdx;
if (input[idx++] == (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED)) {
*inOutIdx = ++idx; /* eat header */
return GetMyVersion(input, inOutIdx, version);
}
/* go back as is */
*version = 0;
return 0;
}
static int GetInt(mp_int* mpi, const byte* input, word32* inOutIdx,
word32 maxIdx)
{
word32 i = *inOutIdx;
byte b = input[i++];
int length;
if (b != ASN_INTEGER)
return ASN_PARSE_E;
if (GetLength(input, &i, &length, maxIdx) < 0)
return ASN_PARSE_E;
if ( (b = input[i++]) == 0x00)
length--;
else
i--;
mp_init(mpi);
if (mp_read_unsigned_bin(mpi, (byte*)input + i, length) != 0) {
mp_clear(mpi);
return ASN_GETINT_E;
}
*inOutIdx = i + length;
return 0;
}
static int GetAlgoId(const byte* input, word32* inOutIdx, word32* oid,
word32 maxIdx)
{
int length;
word32 i = *inOutIdx;
byte b;
*oid = 0;
if (GetSequence(input, &i, &length, maxIdx) < 0)
return ASN_PARSE_E;
b = input[i++];
if (b != ASN_OBJECT_ID)
return ASN_OBJECT_ID_E;
if (GetLength(input, &i, &length, maxIdx) < 0)
return ASN_PARSE_E;
while(length--)
*oid += input[i++];
/* just sum it up for now */
/* could have NULL tag and 0 terminator, but may not */
b = input[i++];
if (b == ASN_TAG_NULL) {
b = input[i++];
if (b != 0)
return ASN_EXPECT_0_E;
}
else
/* go back, didn't have it */
i--;
*inOutIdx = i;
return 0;
}
int RsaPrivateKeyDecode(const byte* input, word32* inOutIdx, RsaKey* key,
word32 inSz)
{
int version, length;
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(input, inOutIdx, &version) < 0)
return ASN_PARSE_E;
key->type = RSA_PRIVATE;
if (GetInt(&key->n, input, inOutIdx, inSz) < 0 ||
GetInt(&key->e, input, inOutIdx, inSz) < 0 ||
GetInt(&key->d, input, inOutIdx, inSz) < 0 ||
GetInt(&key->p, input, inOutIdx, inSz) < 0 ||
GetInt(&key->q, input, inOutIdx, inSz) < 0 ||
GetInt(&key->dP, input, inOutIdx, inSz) < 0 ||
GetInt(&key->dQ, input, inOutIdx, inSz) < 0 ||
GetInt(&key->u, input, inOutIdx, inSz) < 0 ) return ASN_RSA_KEY_E;
return 0;
}
/* Remove PKCS8 header, move beginning of traditional to beginning of input */
int ToTraditional(byte* input, word32 sz)
{
word32 inOutIdx = 0, oid;
int version, length;
if (GetSequence(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(input, &inOutIdx, &version) < 0)
return ASN_PARSE_E;
if (GetAlgoId(input, &inOutIdx, &oid, sz) < 0)
return ASN_PARSE_E;
if (input[inOutIdx++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
XMEMMOVE(input, input + inOutIdx, length);
return 0;
}
#ifndef NO_PWDBASED
/* Check To see if PKCS version algo is supported, set id if it is return 0
< 0 on error */
static int CheckAlgo(int first, int second, int* id, int* version)
{
*id = ALGO_ID_E;
*version = PKCS5; /* default */
if (first == 1) {
switch (second) {
case 1:
*id = PBE_SHA1_RC4_128;
*version = PKCS12;
return 0;
case 3:
*id = PBE_SHA1_DES3;
*version = PKCS12;
return 0;
default:
return ALGO_ID_E;
}
}
if (first != PKCS5)
return ASN_INPUT_E; /* VERSION ERROR */
if (second == PBES2) {
*version = PKCS5v2;
return 0;
}
switch (second) {
case 3: /* see RFC 2898 for ids */
*id = PBE_MD5_DES;
return 0;
case 10:
*id = PBE_SHA1_DES;
return 0;
default:
return ALGO_ID_E;
}
}
/* Check To see if PKCS v2 algo is supported, set id if it is return 0
< 0 on error */
static int CheckAlgoV2(int oid, int* id)
{
switch (oid) {
case 69:
*id = PBE_SHA1_DES;
return 0;
case 652:
*id = PBE_SHA1_DES3;
return 0;
default:
return ALGO_ID_E;
}
}
/* Decrypt intput in place from parameters based on id */
static int DecryptKey(const char* password, int passwordSz, byte* salt,
int saltSz, int iterations, int id, byte* input,
int length, int version, byte* cbcIv)
{
byte key[MAX_KEY_SIZE];
int typeH;
int derivedLen;
int decryptionType;
int ret = 0;
switch (id) {
case PBE_MD5_DES:
typeH = MD5;
derivedLen = 16; /* may need iv for v1.5 */
decryptionType = DES_TYPE;
break;
case PBE_SHA1_DES:
typeH = SHA;
derivedLen = 16; /* may need iv for v1.5 */
decryptionType = DES_TYPE;
break;
case PBE_SHA1_DES3:
typeH = SHA;
derivedLen = 32; /* may need iv for v1.5 */
decryptionType = DES3_TYPE;
break;
case PBE_SHA1_RC4_128:
typeH = SHA;
derivedLen = 16;
decryptionType = RC4_TYPE;
break;
default:
return ALGO_ID_E;
}
if (version == PKCS5v2)
ret = PBKDF2(key, (byte*)password, passwordSz, salt, saltSz, iterations,
derivedLen, typeH);
else if (version == PKCS5)
ret = PBKDF1(key, (byte*)password, passwordSz, salt, saltSz, iterations,
derivedLen, typeH);
else if (version == PKCS12) {
int i, idx = 0;
byte unicodePasswd[MAX_UNICODE_SZ];
if ( (passwordSz * 2 + 2) > (int)sizeof(unicodePasswd))
return UNICODE_SIZE_E;
for (i = 0; i < passwordSz; i++) {
unicodePasswd[idx++] = 0x00;
unicodePasswd[idx++] = (byte)password[i];
}
/* add trailing NULL */
unicodePasswd[idx++] = 0x00;
unicodePasswd[idx++] = 0x00;
ret = PKCS12_PBKDF(key, unicodePasswd, idx, salt, saltSz,
iterations, derivedLen, typeH, 1);
if (decryptionType != RC4_TYPE)
ret += PKCS12_PBKDF(cbcIv, unicodePasswd, idx, salt, saltSz,
iterations, 8, typeH, 2);
}
if (ret != 0)
return ret;
switch (decryptionType) {
#ifndef NO_DES3
case DES_TYPE:
{
Des dec;
byte* desIv = key + 8;
if (version == PKCS5v2 || version == PKCS12)
desIv = cbcIv;
Des_SetKey(&dec, key, desIv, DES_DECRYPTION);
Des_CbcDecrypt(&dec, input, input, length);
break;
}
case DES3_TYPE:
{
Des3 dec;
byte* desIv = key + 24;
if (version == PKCS5v2 || version == PKCS12)
desIv = cbcIv;
Des3_SetKey(&dec, key, desIv, DES_DECRYPTION);
Des3_CbcDecrypt(&dec, input, input, length);
break;
}
#endif
case RC4_TYPE:
{
Arc4 dec;
Arc4SetKey(&dec, key, derivedLen);
Arc4Process(&dec, input, input, length);
break;
}
default:
return ALGO_ID_E;
}
return 0;
}
/* Remove Encrypted PKCS8 header, move beginning of traditional to beginning
of input */
int ToTraditionalEnc(byte* input, word32 sz,const char* password,int passwordSz)
{
word32 inOutIdx = 0, oid;
int first, second, length, iterations, saltSz, id;
int version;
byte salt[MAX_SALT_SIZE];
byte cbcIv[MAX_IV_SIZE];
if (GetSequence(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
if (GetAlgoId(input, &inOutIdx, &oid, sz) < 0)
return ASN_PARSE_E;
first = input[inOutIdx - 2]; /* PKCS version alwyas 2nd to last byte */
second = input[inOutIdx - 1]; /* version.algo, algo id last byte */
if (CheckAlgo(first, second, &id, &version) < 0)
return ASN_INPUT_E; /* Algo ID error */
if (version == PKCS5v2) {
if (GetSequence(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
if (GetAlgoId(input, &inOutIdx, &oid, sz) < 0)
return ASN_PARSE_E;
if (oid != PBKDF2_OID)
return ASN_PARSE_E;
}
if (GetSequence(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
if (input[inOutIdx++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(input, &inOutIdx, &saltSz, sz) < 0)
return ASN_PARSE_E;
if (saltSz > MAX_SALT_SIZE)
return ASN_PARSE_E;
XMEMCPY(salt, &input[inOutIdx], saltSz);
inOutIdx += saltSz;
if (GetShortInt(input, &inOutIdx, &iterations) < 0)
return ASN_PARSE_E;
if (version == PKCS5v2) {
/* get encryption algo */
if (GetAlgoId(input, &inOutIdx, &oid, sz) < 0)
return ASN_PARSE_E;
if (CheckAlgoV2(oid, &id) < 0)
return ASN_PARSE_E; /* PKCS v2 algo id error */
if (input[inOutIdx++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
XMEMCPY(cbcIv, &input[inOutIdx], length);
inOutIdx += length;
}
if (input[inOutIdx++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(input, &inOutIdx, &length, sz) < 0)
return ASN_PARSE_E;
if (DecryptKey(password, passwordSz, salt, saltSz, iterations, id,
input + inOutIdx, length, version, cbcIv) < 0)
return ASN_INPUT_E; /* decrypt failure */
XMEMMOVE(input, input + inOutIdx, length);
return ToTraditional(input, length);
}
#endif /* NO_PWDBASED */
int RsaPublicKeyDecode(const byte* input, word32* inOutIdx, RsaKey* key,
word32 inSz)
{
int length;
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
key->type = RSA_PUBLIC;
#ifdef OPENSSL_EXTRA
{
byte b = input[*inOutIdx];
if (b != ASN_INTEGER) {
/* not from decoded cert, will have algo id, skip past */
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
b = input[(*inOutIdx)++];
if (b != ASN_OBJECT_ID)
return ASN_OBJECT_ID_E;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
*inOutIdx += length; /* skip past */
/* could have NULL tag and 0 terminator, but may not */
b = input[(*inOutIdx)++];
if (b == ASN_TAG_NULL) {
b = input[(*inOutIdx)++];
if (b != 0)
return ASN_EXPECT_0_E;
}
else
/* go back, didn't have it */
(*inOutIdx)--;
/* should have bit tag length and seq next */
b = input[(*inOutIdx)++];
if (b != ASN_BIT_STRING)
return ASN_BITSTR_E;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
/* could have 0 */
b = input[(*inOutIdx)++];
if (b != 0)
(*inOutIdx)--;
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
} /* end if */
} /* openssl var block */
#endif /* OPENSSL_EXTRA */
if (GetInt(&key->n, input, inOutIdx, inSz) < 0 ||
GetInt(&key->e, input, inOutIdx, inSz) < 0 ) return ASN_RSA_KEY_E;
return 0;
}
#ifndef NO_DH
int DhKeyDecode(const byte* input, word32* inOutIdx, DhKey* key, word32 inSz)
{
int length;
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
if (GetInt(&key->p, input, inOutIdx, inSz) < 0 ||
GetInt(&key->g, input, inOutIdx, inSz) < 0 ) return ASN_DH_KEY_E;
return 0;
}
int DhSetKey(DhKey* key, const byte* p, word32 pSz, const byte* g, word32 gSz)
{
/* may have leading 0 */
if (p[0] == 0) {
pSz--; p++;
}
if (g[0] == 0) {
gSz--; g++;
}
mp_init(&key->p);
if (mp_read_unsigned_bin(&key->p, p, pSz) != 0) {
mp_clear(&key->p);
return ASN_DH_KEY_E;
}
mp_init(&key->g);
if (mp_read_unsigned_bin(&key->g, g, gSz) != 0) {
mp_clear(&key->p);
return ASN_DH_KEY_E;
}
return 0;
}
#endif /* NO_DH */
#ifndef NO_DSA
int DsaPublicKeyDecode(const byte* input, word32* inOutIdx, DsaKey* key,
word32 inSz)
{
int length;
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
if (GetInt(&key->p, input, inOutIdx, inSz) < 0 ||
GetInt(&key->q, input, inOutIdx, inSz) < 0 ||
GetInt(&key->g, input, inOutIdx, inSz) < 0 ||
GetInt(&key->y, input, inOutIdx, inSz) < 0 ) return ASN_DH_KEY_E;
key->type = DSA_PUBLIC;
return 0;
}
int DsaPrivateKeyDecode(const byte* input, word32* inOutIdx, DsaKey* key,
word32 inSz)
{
int length, version;
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(input, inOutIdx, &version) < 0)
return ASN_PARSE_E;
if (GetInt(&key->p, input, inOutIdx, inSz) < 0 ||
GetInt(&key->q, input, inOutIdx, inSz) < 0 ||
GetInt(&key->g, input, inOutIdx, inSz) < 0 ||
GetInt(&key->y, input, inOutIdx, inSz) < 0 ||
GetInt(&key->x, input, inOutIdx, inSz) < 0 ) return ASN_DH_KEY_E;
key->type = DSA_PRIVATE;
return 0;
}
#endif /* NO_DSA */
void InitDecodedCert(DecodedCert* cert, byte* source, word32 inSz, void* heap)
{
cert->publicKey = 0;
cert->pubKeyStored = 0;
cert->signature = 0;
cert->subjectCN = 0;
cert->subjectCNLen = 0;
cert->source = source; /* don't own */
cert->srcIdx = 0;
cert->maxIdx = inSz; /* can't go over this index */
cert->heap = heap;
XMEMSET(cert->serial, 0, EXTERNAL_SERIAL_SIZE);
cert->serialSz = 0;
#ifdef CYASSL_CERT_GEN
cert->subjectSN = 0;
cert->subjectSNLen = 0;
cert->subjectC = 0;
cert->subjectCLen = 0;
cert->subjectL = 0;
cert->subjectLLen = 0;
cert->subjectST = 0;
cert->subjectSTLen = 0;
cert->subjectO = 0;
cert->subjectOLen = 0;
cert->subjectOU = 0;
cert->subjectOULen = 0;
cert->subjectEmail = 0;
cert->subjectEmailLen = 0;
#endif /* CYASSL_CERT_GEN */
}
void FreeDecodedCert(DecodedCert* cert)
{
if (cert->subjectCNLen == 0) /* 0 means no longer pointer to raw, we own */
XFREE(cert->subjectCN, cert->heap, DYNAMIC_TYPE_SUBJECT_CN);
if (cert->pubKeyStored == 1)
XFREE(cert->publicKey, cert->heap, DYNAMIC_TYPE_PUBLIC_KEY);
}
static int GetCertHeader(DecodedCert* cert)
{
int ret = 0, version, len;
byte serialTmp[EXTERNAL_SERIAL_SIZE];
mp_int mpi;
if (GetSequence(cert->source, &cert->srcIdx, &len, cert->maxIdx) < 0)
return ASN_PARSE_E;
cert->certBegin = cert->srcIdx;
if (GetSequence(cert->source, &cert->srcIdx, &len, cert->maxIdx) < 0)
return ASN_PARSE_E;
cert->sigIndex = len + cert->srcIdx;
if (GetExplicitVersion(cert->source, &cert->srcIdx, &version) < 0)
return ASN_PARSE_E;
if (GetInt(&mpi, cert->source, &cert->srcIdx, cert->maxIdx) < 0)
return ASN_PARSE_E;
len = mp_unsigned_bin_size(&mpi);
if (len < (int)sizeof(serialTmp)) {
if (mp_to_unsigned_bin(&mpi, serialTmp) == MP_OKAY) {
if (len > EXTERNAL_SERIAL_SIZE)
len = EXTERNAL_SERIAL_SIZE;
XMEMCPY(cert->serial, serialTmp, len);
cert->serialSz = len;
}
}
mp_clear(&mpi);
return ret;
}
/* Store Rsa Key, may save later, Dsa could use in future */
static int StoreRsaKey(DecodedCert* cert)
{
int length;
word32 read = cert->srcIdx;
if (GetSequence(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
read = cert->srcIdx - read;
length += read;
while (read--)
cert->srcIdx--;
cert->pubKeySize = length;
cert->publicKey = cert->source + cert->srcIdx;
cert->srcIdx += length;
return 0;
}
#ifdef HAVE_ECC
/* return 0 on sucess if the ECC curve oid sum is supported */
static int CheckCurve(word32 oid)
{
if (oid != ECC_256R1 && oid != ECC_384R1 && oid != ECC_521R1 && oid !=
ECC_160R1 && oid != ECC_192R1 && oid != ECC_224R1)
return ALGO_ID_E;
return 0;
}
#endif /* HAVE_ECC */
static int GetKey(DecodedCert* cert)
{
int length;
#ifdef HAVE_NTRU
int tmpIdx = cert->srcIdx;
#endif
if (GetSequence(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
if (GetAlgoId(cert->source, &cert->srcIdx, &cert->keyOID, cert->maxIdx) < 0)
return ASN_PARSE_E;
if (cert->keyOID == RSAk) {
byte b = cert->source[cert->srcIdx++];
if (b != ASN_BIT_STRING)
return ASN_BITSTR_E;
if (GetLength(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
b = cert->source[cert->srcIdx++];
if (b != 0x00)
return ASN_EXPECT_0_E;
}
else if (cert->keyOID == DSAk )
; /* do nothing */
#ifdef HAVE_NTRU
else if (cert->keyOID == NTRUk ) {
const byte* key = &cert->source[tmpIdx];
byte* next = (byte*)key;
word16 keyLen;
byte keyBlob[MAX_NTRU_KEY_SZ];
word32 rc = crypto_ntru_encrypt_subjectPublicKeyInfo2PublicKey(key,
&keyLen, NULL, &next);
if (rc != NTRU_OK)
return ASN_NTRU_KEY_E;
if (keyLen > sizeof(keyBlob))
return ASN_NTRU_KEY_E;
rc = crypto_ntru_encrypt_subjectPublicKeyInfo2PublicKey(key, &keyLen,
keyBlob, &next);
if (rc != NTRU_OK)
return ASN_NTRU_KEY_E;
if ( (next - key) < 0)
return ASN_NTRU_KEY_E;
cert->srcIdx = tmpIdx + (next - key);
cert->publicKey = (byte*) XMALLOC(keyLen, cert->heap,
DYNAMIC_TYPE_PUBLIC_KEY);
if (cert->publicKey == NULL)
return MEMORY_E;
XMEMCPY(cert->publicKey, keyBlob, keyLen);
cert->pubKeyStored = 1;
cert->pubKeySize = keyLen;
}
#endif /* HAVE_NTRU */
#ifdef HAVE_ECC
else if (cert->keyOID == ECDSAk ) {
word32 oid = 0;
int oidSz = 0;
byte b = cert->source[cert->srcIdx++];
if (b != ASN_OBJECT_ID)
return ASN_OBJECT_ID_E;
if (GetLength(cert->source, &cert->srcIdx, &oidSz, cert->maxIdx) < 0)
return ASN_PARSE_E;
while(oidSz--)
oid += cert->source[cert->srcIdx++];
if (CheckCurve(oid) < 0)
return ECC_CURVE_OID_E;
/* key header */
b = cert->source[cert->srcIdx++];
if (b != ASN_BIT_STRING)
return ASN_BITSTR_E;
if (GetLength(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
b = cert->source[cert->srcIdx++];
if (b != 0x00)
return ASN_EXPECT_0_E;
/* actual key, use length - 1 since preceding 0 */
cert->publicKey = (byte*) XMALLOC(length - 1, cert->heap,
DYNAMIC_TYPE_PUBLIC_KEY);
if (cert->publicKey == NULL)
return MEMORY_E;
XMEMCPY(cert->publicKey, &cert->source[cert->srcIdx], length - 1);
cert->pubKeyStored = 1;
cert->pubKeySize = length - 1;
cert->srcIdx += length;
}
#endif /* HAVE_ECC */
else
return ASN_UNKNOWN_OID_E;
if (cert->keyOID == RSAk)
return StoreRsaKey(cert);
return 0;
}
/* process NAME, either issuer or subject */
static int GetName(DecodedCert* cert, int nameType)
{
Sha sha;
int length; /* length of all distinguished names */
int dummy;
char* full = (nameType == ISSUER) ? cert->issuer : cert->subject;
word32 idx = 0;
InitSha(&sha);
if (GetSequence(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
length += cert->srcIdx;
while (cert->srcIdx < (word32)length) {
byte b;
byte joint[2];
int oidSz;
if (GetSet(cert->source, &cert->srcIdx, &dummy, cert->maxIdx) < 0)
CYASSL_MSG("Cert name lacks set header, trying sequence");
if (GetSequence(cert->source, &cert->srcIdx, &dummy, cert->maxIdx) < 0)
return ASN_PARSE_E;
b = cert->source[cert->srcIdx++];
if (b != ASN_OBJECT_ID)
return ASN_OBJECT_ID_E;
if (GetLength(cert->source, &cert->srcIdx, &oidSz, cert->maxIdx) < 0)
return ASN_PARSE_E;
XMEMCPY(joint, &cert->source[cert->srcIdx], sizeof(joint));
/* v1 name types */
if (joint[0] == 0x55 && joint[1] == 0x04) {
byte id;
byte copy = FALSE;
int strLen;
cert->srcIdx += 2;
id = cert->source[cert->srcIdx++];
b = cert->source[cert->srcIdx++]; /* strType */
if (GetLength(cert->source, &cert->srcIdx, &strLen,
cert->maxIdx) < 0)
return ASN_PARSE_E;
if (strLen > (int)(ASN_NAME_MAX - idx))
return ASN_PARSE_E;
if (4 > (ASN_NAME_MAX - idx)) /* make sure room for biggest */
return ASN_PARSE_E; /* pre fix header too "/CN=" */
if (id == ASN_COMMON_NAME) {
if (nameType == SUBJECT) {
cert->subjectCN = (char *)&cert->source[cert->srcIdx];
cert->subjectCNLen = strLen;
}
XMEMCPY(&full[idx], "/CN=", 4);
idx += 4;
copy = TRUE;
}
else if (id == ASN_SUR_NAME) {
XMEMCPY(&full[idx], "/SN=", 4);
idx += 4;
copy = TRUE;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectSN = (char*)&cert->source[cert->srcIdx];
cert->subjectSNLen = strLen;
}
#endif /* CYASSL_CERT_GEN */
}
else if (id == ASN_COUNTRY_NAME) {
XMEMCPY(&full[idx], "/C=", 3);
idx += 3;
copy = TRUE;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectC = (char*)&cert->source[cert->srcIdx];
cert->subjectCLen = strLen;
}
#endif /* CYASSL_CERT_GEN */
}
else if (id == ASN_LOCALITY_NAME) {
XMEMCPY(&full[idx], "/L=", 3);
idx += 3;
copy = TRUE;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectL = (char*)&cert->source[cert->srcIdx];
cert->subjectLLen = strLen;
}
#endif /* CYASSL_CERT_GEN */
}
else if (id == ASN_STATE_NAME) {
XMEMCPY(&full[idx], "/ST=", 4);
idx += 4;
copy = TRUE;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectST = (char*)&cert->source[cert->srcIdx];
cert->subjectSTLen = strLen;
}
#endif /* CYASSL_CERT_GEN */
}
else if (id == ASN_ORG_NAME) {
XMEMCPY(&full[idx], "/O=", 3);
idx += 3;
copy = TRUE;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectO = (char*)&cert->source[cert->srcIdx];
cert->subjectOLen = strLen;
}
#endif /* CYASSL_CERT_GEN */
}
else if (id == ASN_ORGUNIT_NAME) {
XMEMCPY(&full[idx], "/OU=", 4);
idx += 4;
copy = TRUE;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectOU = (char*)&cert->source[cert->srcIdx];
cert->subjectOULen = strLen;
}
#endif /* CYASSL_CERT_GEN */
}
if (copy) {
XMEMCPY(&full[idx], &cert->source[cert->srcIdx], strLen);
idx += strLen;
}
ShaUpdate(&sha, &cert->source[cert->srcIdx], strLen);
cert->srcIdx += strLen;
}
else {
/* skip */
byte email = FALSE;
byte uid = FALSE;
int adv;
if (joint[0] == 0x2a && joint[1] == 0x86) /* email id hdr */
email = TRUE;
if (joint[0] == 0x9 && joint[1] == 0x92) /* uid id hdr */
uid = TRUE;
cert->srcIdx += oidSz + 1;
if (GetLength(cert->source, &cert->srcIdx, &adv, cert->maxIdx) < 0)
return ASN_PARSE_E;
if (adv > (int)(ASN_NAME_MAX - idx))
return ASN_PARSE_E;
if (email) {
if (14 > (ASN_NAME_MAX - idx))
return ASN_PARSE_E;
XMEMCPY(&full[idx], "/emailAddress=", 14);
idx += 14;
#ifdef CYASSL_CERT_GEN
if (nameType == SUBJECT) {
cert->subjectEmail = (char*)&cert->source[cert->srcIdx];
cert->subjectEmailLen = adv;
}
#endif /* CYASSL_CERT_GEN */
XMEMCPY(&full[idx], &cert->source[cert->srcIdx], adv);
idx += adv;
}
if (uid) {
if (5 > (ASN_NAME_MAX - idx))
return ASN_PARSE_E;
XMEMCPY(&full[idx], "/UID=", 5);
idx += 5;
XMEMCPY(&full[idx], &cert->source[cert->srcIdx], adv);
idx += adv;
}
cert->srcIdx += adv;
}
}
full[idx++] = 0;
if (nameType == ISSUER)
ShaFinal(&sha, cert->issuerHash);
else
ShaFinal(&sha, cert->subjectHash);
return 0;
}
#ifndef NO_TIME_H
/* to the second */
static int DateGreaterThan(const struct tm* a, const struct tm* b)
{
if (a->tm_year > b->tm_year)
return 1;
if (a->tm_year == b->tm_year && a->tm_mon > b->tm_mon)
return 1;
if (a->tm_year == b->tm_year && a->tm_mon == b->tm_mon &&
a->tm_mday > b->tm_mday)
return 1;
if (a->tm_year == b->tm_year && a->tm_mon == b->tm_mon &&
a->tm_mday == b->tm_mday && a->tm_hour > b->tm_hour)
return 1;
if (a->tm_year == b->tm_year && a->tm_mon == b->tm_mon &&
a->tm_mday == b->tm_mday && a->tm_hour == b->tm_hour &&
a->tm_min > b->tm_min)
return 1;
if (a->tm_year == b->tm_year && a->tm_mon == b->tm_mon &&
a->tm_mday == b->tm_mday && a->tm_hour == b->tm_hour &&
a->tm_min == b->tm_min && a->tm_sec > b->tm_sec)
return 1;
return 0; /* false */
}
static INLINE int DateLessThan(const struct tm* a, const struct tm* b)
{
return !DateGreaterThan(a,b);
}
/* like atoi but only use first byte */
/* Make sure before and after dates are valid */
static int ValidateDate(const byte* date, byte format, int dateType)
{
time_t ltime;
struct tm certTime;
struct tm* localTime;
int i = 0;
ltime = XTIME(0);
XMEMSET(&certTime, 0, sizeof(certTime));
if (format == ASN_UTC_TIME) {
if (btoi(date[0]) >= 5)
certTime.tm_year = 1900;
else
certTime.tm_year = 2000;
}
else { /* format == GENERALIZED_TIME */
certTime.tm_year += btoi(date[i++]) * 1000;
certTime.tm_year += btoi(date[i++]) * 100;
}
GetTime(&certTime.tm_year, date, &i); certTime.tm_year -= 1900; /* adjust */
GetTime(&certTime.tm_mon, date, &i); certTime.tm_mon -= 1; /* adjust */
GetTime(&certTime.tm_mday, date, &i);
GetTime(&certTime.tm_hour, date, &i);
GetTime(&certTime.tm_min, date, &i);
GetTime(&certTime.tm_sec, date, &i);
if (date[i] != 'Z') { /* only Zulu supported for this profile */
CYASSL_MSG("Only Zulu time supported for this profile");
return 0;
}
localTime = XGMTIME(&ltime);
if (dateType == BEFORE) {
if (DateLessThan(localTime, &certTime))
return 0;
}
else
if (DateGreaterThan(localTime, &certTime))
return 0;
return 1;
}
#endif /* NO_TIME_H */
static int GetDate(DecodedCert* cert, int dateType)
{
int length;
byte date[MAX_DATE_SIZE];
byte b = cert->source[cert->srcIdx++];
if (b != ASN_UTC_TIME && b != ASN_GENERALIZED_TIME)
return ASN_TIME_E;
if (GetLength(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
if (length > MAX_DATE_SIZE || length < MIN_DATE_SIZE)
return ASN_DATE_SZ_E;
XMEMCPY(date, &cert->source[cert->srcIdx], length);
cert->srcIdx += length;
if (!XVALIDATE_DATE(date, b, dateType)) {
if (dateType == BEFORE)
return ASN_BEFORE_DATE_E;
else
return ASN_AFTER_DATE_E;
}
return 0;
}
static int GetValidity(DecodedCert* cert, int verify)
{
int length;
int badDate = 0;
if (GetSequence(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
if (GetDate(cert, BEFORE) < 0 && verify)
badDate = ASN_BEFORE_DATE_E; /* continue parsing */
if (GetDate(cert, AFTER) < 0 && verify)
return ASN_AFTER_DATE_E;
if (badDate != 0)
return badDate;
return 0;
}
static int DecodeToKey(DecodedCert* cert, int verify)
{
int badDate = 0;
int ret;
if ( (ret = GetCertHeader(cert)) < 0)
return ret;
if ( (ret = GetAlgoId(cert->source, &cert->srcIdx, &cert->signatureOID,
cert->maxIdx)) < 0)
return ret;
if ( (ret = GetName(cert, ISSUER)) < 0)
return ret;
if ( (ret = GetValidity(cert, verify)) < 0)
badDate = ret;
if ( (ret = GetName(cert, SUBJECT)) < 0)
return ret;
if ( (ret = GetKey(cert)) < 0)
return ret;
if (badDate != 0)
return badDate;
return ret;
}
static int GetSignature(DecodedCert* cert)
{
int length;
byte b = cert->source[cert->srcIdx++];
if (b != ASN_BIT_STRING)
return ASN_BITSTR_E;
if (GetLength(cert->source, &cert->srcIdx, &length, cert->maxIdx) < 0)
return ASN_PARSE_E;
cert->sigLength = length;
b = cert->source[cert->srcIdx++];
if (b != 0x00)
return ASN_EXPECT_0_E;
cert->sigLength--;
cert->signature = &cert->source[cert->srcIdx];
cert->srcIdx += cert->sigLength;
return 0;
}
static word32 SetDigest(const byte* digest, word32 digSz, byte* output)
{
output[0] = ASN_OCTET_STRING;
output[1] = (byte)digSz;
XMEMCPY(&output[2], digest, digSz);
return digSz + 2;
}
static word32 BytePrecision(word32 value)
{
word32 i;
for (i = sizeof(value); i; --i)
if (value >> (i - 1) * 8)
break;
return i;
}
static word32 SetLength(word32 length, byte* output)
{
word32 i = 0, j;
if (length < ASN_LONG_LENGTH)
output[i++] = (byte)length;
else {
output[i++] = (byte)(BytePrecision(length) | ASN_LONG_LENGTH);
for (j = BytePrecision(length); j; --j) {
output[i] = (byte)(length >> (j - 1) * 8);
i++;
}
}
return i;
}
static word32 SetSequence(word32 len, byte* output)
{
output[0] = ASN_SEQUENCE | ASN_CONSTRUCTED;
return SetLength(len, output + 1) + 1;
}
static word32 SetAlgoID(int algoOID, byte* output, int type)
{
/* adding TAG_NULL and 0 to end */
/* hashTypes */
static const byte shaAlgoID[] = { 0x2b, 0x0e, 0x03, 0x02, 0x1a,
0x05, 0x00 };
static const byte sha256AlgoID[] = { 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x01, 0x05, 0x00 };
static const byte md5AlgoID[] = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x02, 0x05, 0x05, 0x00 };
static const byte md2AlgoID[] = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x02, 0x02, 0x05, 0x00};
/* sigTypes */
static const byte md5wRSA_AlgoID[] = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x01, 0x01, 0x04, 0x05, 0x00};
/* keyTypes */
static const byte RSA_AlgoID[] = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x01, 0x01, 0x01, 0x05, 0x00};
int algoSz = 0;
word32 idSz, seqSz;
const byte* algoName = 0;
byte ID_Length[MAX_LENGTH_SZ];
byte seqArray[MAX_SEQ_SZ + 1]; /* add object_id to end */
if (type == hashType) {
switch (algoOID) {
case SHAh:
algoSz = sizeof(shaAlgoID);
algoName = shaAlgoID;
break;
case SHA256h:
algoSz = sizeof(sha256AlgoID);
algoName = sha256AlgoID;
break;
case MD2h:
algoSz = sizeof(md2AlgoID);
algoName = md2AlgoID;
break;
case MD5h:
algoSz = sizeof(md5AlgoID);
algoName = md5AlgoID;
break;
default:
CYASSL_MSG("Unknown Hash Algo");
return 0; /* UNKOWN_HASH_E; */
}
}
else if (type == sigType) { /* sigType */
switch (algoOID) {
case MD5wRSA:
algoSz = sizeof(md5wRSA_AlgoID);
algoName = md5wRSA_AlgoID;
break;
default:
CYASSL_MSG("Unknown Signature Algo");
return 0;
}
}
else if (type == keyType) { /* keyType */
switch (algoOID) {
case RSAk:
algoSz = sizeof(RSA_AlgoID);
algoName = RSA_AlgoID;
break;
default:
CYASSL_MSG("Unknown Key Algo");
return 0;
}
}
else {
CYASSL_MSG("Unknown Algo type");
return 0;
}
idSz = SetLength(algoSz - 2, ID_Length); /* don't include TAG_NULL/0 */
seqSz = SetSequence(idSz + algoSz + 1, seqArray);
seqArray[seqSz++] = ASN_OBJECT_ID;
XMEMCPY(output, seqArray, seqSz);
XMEMCPY(output + seqSz, ID_Length, idSz);
XMEMCPY(output + seqSz + idSz, algoName, algoSz);
return seqSz + idSz + algoSz;
}
word32 EncodeSignature(byte* out, const byte* digest, word32 digSz, int hashOID)
{
byte digArray[MAX_ENCODED_DIG_SZ];
byte algoArray[MAX_ALGO_SZ];
byte seqArray[MAX_SEQ_SZ];
word32 encDigSz, algoSz, seqSz;
encDigSz = SetDigest(digest, digSz, digArray);
algoSz = SetAlgoID(hashOID, algoArray, hashType);
seqSz = SetSequence(encDigSz + algoSz, seqArray);
XMEMCPY(out, seqArray, seqSz);
XMEMCPY(out + seqSz, algoArray, algoSz);
XMEMCPY(out + seqSz + algoSz, digArray, encDigSz);
return encDigSz + algoSz + seqSz;
}
/* return true (1) for Confirmation */
static int ConfirmSignature(DecodedCert* cert, const byte* key, word32 keySz,
word32 keyOID)
{
#ifndef NO_SHA256
byte digest[SHA256_DIGEST_SIZE]; /* max size */
#else
byte digest[SHA_DIGEST_SIZE]; /* max size */
#endif
int typeH, digestSz, ret;
if (cert->signatureOID == MD5wRSA) {
Md5 md5;
InitMd5(&md5);
Md5Update(&md5, cert->source + cert->certBegin,
cert->sigIndex - cert->certBegin);
Md5Final(&md5, digest);
typeH = MD5h;
digestSz = MD5_DIGEST_SIZE;
}
else if (cert->signatureOID == SHAwRSA || cert->signatureOID == SHAwDSA ||
cert->signatureOID == SHAwECDSA) {
Sha sha;
InitSha(&sha);
ShaUpdate(&sha, cert->source + cert->certBegin,
cert->sigIndex - cert->certBegin);
ShaFinal(&sha, digest);
typeH = SHAh;
digestSz = SHA_DIGEST_SIZE;
}
#ifndef NO_SHA256
else if (cert->signatureOID == SHA256wRSA ||
cert->signatureOID == SHA256wECDSA) {
Sha256 sha256;
InitSha256(&sha256);
Sha256Update(&sha256, cert->source + cert->certBegin,
cert->sigIndex - cert->certBegin);
Sha256Final(&sha256, digest);
typeH = SHA256h;
digestSz = SHA256_DIGEST_SIZE;
}
#endif
else {
CYASSL_MSG("Verify Signautre has unsupported type");
return 0;
}
if (keyOID == RSAk) {
RsaKey pubKey;
byte encodedSig[MAX_ENCODED_SIG_SZ];
byte plain[MAX_ENCODED_SIG_SZ];
word32 idx = 0;
int sigSz, verifySz;
byte* out;
if (cert->sigLength > MAX_ENCODED_SIG_SZ) {
CYASSL_MSG("Verify Signautre is too big");
return 0;
}
InitRsaKey(&pubKey, cert->heap);
if (RsaPublicKeyDecode(key, &idx, &pubKey, keySz) < 0) {
CYASSL_MSG("ASN Key decode error RSA");
ret = 0;
}
else {
XMEMCPY(plain, cert->signature, cert->sigLength);
if ( (verifySz = RsaSSL_VerifyInline(plain, cert->sigLength, &out,
&pubKey)) < 0) {
CYASSL_MSG("Rsa SSL verify error");
ret = 0;
}
else {
/* make sure we're right justified */
sigSz = EncodeSignature(encodedSig, digest, digestSz, typeH);
if (sigSz != verifySz || XMEMCMP(out, encodedSig, sigSz) != 0){
CYASSL_MSG("Rsa SSL verify match encode error");
ret = 0;
}
else
ret = 1; /* match */
#ifdef CYASSL_DEBUG_ENCODING
{
int x;
printf("cyassl encodedSig:\n");
for (x = 0; x < sigSz; x++) {
printf("%02x ", encodedSig[x]);
if ( (x % 16) == 15)
printf("\n");
}
printf("\n");
printf("actual digest:\n");
for (x = 0; x < verifySz; x++) {
printf("%02x ", out[x]);
if ( (x % 16) == 15)
printf("\n");
}
printf("\n");
}
#endif /* CYASSL_DEBUG_ENCODING */
}
}
FreeRsaKey(&pubKey);
return ret;
}
#ifdef HAVE_ECC
else if (keyOID == ECDSAk) {
ecc_key pubKey;
int verify = 0;
if (ecc_import_x963(key, keySz, &pubKey) < 0) {
CYASSL_MSG("ASN Key import error ECC");
return 0;
}
ret = ecc_verify_hash(cert->signature, cert->sigLength, digest,
digestSz, &verify, &pubKey);
ecc_free(&pubKey);
if (ret == 0 && verify == 1)
return 1; /* match */
CYASSL_MSG("ECC Verify didn't match");
return 0;
}
#endif /* HAVE_ECC */
else {
CYASSL_MSG("Verify Key type unknown");
return 0;
}
}
int ParseCert(DecodedCert* cert, int type, int verify,
Signer* signers)
{
int ret;
char* ptr;
ret = ParseCertRelative(cert, type, verify, signers);
if (ret < 0)
return ret;
if (cert->subjectCNLen > 0) {
ptr = (char*) XMALLOC(cert->subjectCNLen + 1, cert->heap,
DYNAMIC_TYPE_SUBJECT_CN);
if (ptr == NULL)
return MEMORY_E;
XMEMCPY(ptr, cert->subjectCN, cert->subjectCNLen);
ptr[cert->subjectCNLen] = '\0';
cert->subjectCN = ptr;
cert->subjectCNLen = 0;
}
if (cert->keyOID == RSAk && cert->pubKeySize > 0) {
ptr = (char*) XMALLOC(cert->pubKeySize, cert->heap,
DYNAMIC_TYPE_PUBLIC_KEY);
if (ptr == NULL)
return MEMORY_E;
XMEMCPY(ptr, cert->publicKey, cert->pubKeySize);
cert->publicKey = (byte *)ptr;
cert->pubKeyStored = 1;
}
return ret;
}
/* from SSL proper, for locking can't do find here anymore */
CYASSL_LOCAL Signer* GetCA(Signer* signers, byte* hash);
int ParseCertRelative(DecodedCert* cert, int type, int verify,
Signer* signers)
{
word32 confirmOID;
int ret;
int badDate = 0;
if ((ret = DecodeToKey(cert, verify)) < 0) {
if (ret == ASN_BEFORE_DATE_E || ret == ASN_AFTER_DATE_E)
badDate = ret;
else
return ret;
}
if (cert->srcIdx != cert->sigIndex)
cert->srcIdx = cert->sigIndex;
if ((ret = GetAlgoId(cert->source, &cert->srcIdx, &confirmOID,
cert->maxIdx)) < 0)
return ret;
if ((ret = GetSignature(cert)) < 0)
return ret;
if (confirmOID != cert->signatureOID)
return ASN_SIG_OID_E;
if (verify && type != CA_TYPE) {
Signer* ca = GetCA(signers, cert->issuerHash);
CYASSL_MSG("About to verify certificate signature");
if (ca) {
/* try to confirm/verify signature */
if (!ConfirmSignature(cert, ca->publicKey,
ca->pubKeySize, ca->keyOID)) {
CYASSL_MSG("Confirm signature failed");
return ASN_SIG_CONFIRM_E;
}
}
else {
/* no signer */
CYASSL_MSG("No CA signer to verify with");
return ASN_SIG_CONFIRM_E;
}
}
if (badDate != 0)
return badDate;
return 0;
}
Signer* MakeSigner(void* heap)
{
Signer* signer = (Signer*) XMALLOC(sizeof(Signer), heap,
DYNAMIC_TYPE_SIGNER);
if (signer) {
signer->name = 0;
signer->publicKey = 0;
signer->next = 0;
}
(void)heap;
return signer;
}
void FreeSigners(Signer* signer, void* heap)
{
while (signer) {
Signer* next = signer->next;
XFREE(signer->name, heap, DYNAMIC_TYPE_SUBJECT_CN);
XFREE(signer->publicKey, heap, DYNAMIC_TYPE_PUBLIC_KEY);
XFREE(signer, heap, DYNAMIC_TYPE_SIGNER);
signer = next;
}
(void)heap;
}
void CTaoCryptErrorString(int error, char* buffer)
{
const int max = MAX_ERROR_SZ; /* shorthand */
#ifdef NO_ERROR_STRINGS
XSTRNCPY(buffer, "no support for error strings built in", max);
#else
switch (error) {
case OPEN_RAN_E :
XSTRNCPY(buffer, "opening random device error", max);
break;
case READ_RAN_E :
XSTRNCPY(buffer, "reading random device error", max);
break;
case WINCRYPT_E :
XSTRNCPY(buffer, "windows crypt init error", max);
break;
case CRYPTGEN_E :
XSTRNCPY(buffer, "windows crypt generation error", max);
break;
case RAN_BLOCK_E :
XSTRNCPY(buffer, "random device read would block error", max);
break;
case MP_INIT_E :
XSTRNCPY(buffer, "mp_init error state", max);
break;
case MP_READ_E :
XSTRNCPY(buffer, "mp_read error state", max);
break;
case MP_EXPTMOD_E :
XSTRNCPY(buffer, "mp_exptmod error state", max);
break;
case MP_TO_E :
XSTRNCPY(buffer, "mp_to_xxx error state, can't convert", max);
break;
case MP_SUB_E :
XSTRNCPY(buffer, "mp_sub error state, can't subtract", max);
break;
case MP_ADD_E :
XSTRNCPY(buffer, "mp_add error state, can't add", max);
break;
case MP_MUL_E :
XSTRNCPY(buffer, "mp_mul error state, can't multiply", max);
break;
case MP_MULMOD_E :
XSTRNCPY(buffer, "mp_mulmod error state, can't multiply mod", max);
break;
case MP_MOD_E :
XSTRNCPY(buffer, "mp_mod error state, can't mod", max);
break;
case MP_INVMOD_E :
XSTRNCPY(buffer, "mp_invmod error state, can't inv mod", max);
break;
case MP_CMP_E :
XSTRNCPY(buffer, "mp_cmp error state", max);
break;
case MP_ZERO_E :
XSTRNCPY(buffer, "mp zero result, not expected", max);
break;
case MEMORY_E :
XSTRNCPY(buffer, "out of memory error", max);
break;
case RSA_WRONG_TYPE_E :
XSTRNCPY(buffer, "RSA wrong block type for RSA function", max);
break;
case RSA_BUFFER_E :
XSTRNCPY(buffer, "RSA buffer error, output too small or input too big",
max);
break;
case BUFFER_E :
XSTRNCPY(buffer, "Buffer error, output too small or input too big",max);
break;
case ALGO_ID_E :
XSTRNCPY(buffer, "Setting Cert AlogID error", max);
break;
case PUBLIC_KEY_E :
XSTRNCPY(buffer, "Setting Cert Public Key error", max);
break;
case DATE_E :
XSTRNCPY(buffer, "Setting Cert Date validity error", max);
break;
case SUBJECT_E :
XSTRNCPY(buffer, "Setting Cert Subject name error", max);
break;
case ISSUER_E :
XSTRNCPY(buffer, "Setting Cert Issuer name error", max);
break;
case ASN_PARSE_E :
XSTRNCPY(buffer, "ASN parsing error, invalid input", max);
break;
case ASN_VERSION_E :
XSTRNCPY(buffer, "ASN version error, invalid number", max);
break;
case ASN_GETINT_E :
XSTRNCPY(buffer, "ASN get big int error, invalid data", max);
break;
case ASN_RSA_KEY_E :
XSTRNCPY(buffer, "ASN key init error, invalid input", max);
break;
case ASN_OBJECT_ID_E :
XSTRNCPY(buffer, "ASN object id error, invalid id", max);
break;
case ASN_TAG_NULL_E :
XSTRNCPY(buffer, "ASN tag error, not null", max);
break;
case ASN_EXPECT_0_E :
XSTRNCPY(buffer, "ASN expect error, not zero", max);
break;
case ASN_BITSTR_E :
XSTRNCPY(buffer, "ASN bit string error, wrong id", max);
break;
case ASN_UNKNOWN_OID_E :
XSTRNCPY(buffer, "ASN oid error, unknown sum id", max);
break;
case ASN_DATE_SZ_E :
XSTRNCPY(buffer, "ASN date error, bad size", max);
break;
case ASN_BEFORE_DATE_E :
XSTRNCPY(buffer, "ASN date error, current date before", max);
break;
case ASN_AFTER_DATE_E :
XSTRNCPY(buffer, "ASN date error, current date after", max);
break;
case ASN_SIG_OID_E :
XSTRNCPY(buffer, "ASN signature error, mismatched oid", max);
break;
case ASN_TIME_E :
XSTRNCPY(buffer, "ASN time error, unkown time type", max);
break;
case ASN_INPUT_E :
XSTRNCPY(buffer, "ASN input error, not enough data", max);
break;
case ASN_SIG_CONFIRM_E :
XSTRNCPY(buffer, "ASN sig error, confirm failure", max);
break;
case ASN_SIG_HASH_E :
XSTRNCPY(buffer, "ASN sig error, unsupported hash type", max);
break;
case ASN_SIG_KEY_E :
XSTRNCPY(buffer, "ASN sig error, unsupported key type", max);
break;
case ASN_DH_KEY_E :
XSTRNCPY(buffer, "ASN key init error, invalid input", max);
break;
case ASN_NTRU_KEY_E :
XSTRNCPY(buffer, "ASN NTRU key decode error, invalid input", max);
break;
case ECC_BAD_ARG_E :
XSTRNCPY(buffer, "ECC input argument wrong type, invalid input", max);
break;
case ASN_ECC_KEY_E :
XSTRNCPY(buffer, "ECC ASN1 bad key data, invalid input", max);
break;
case ECC_CURVE_OID_E :
XSTRNCPY(buffer, "ECC curve sum OID unsupported, invalid input", max);
break;
case BAD_FUNC_ARG :
XSTRNCPY(buffer, "Bad function argument", max);
break;
case NOT_COMPILED_IN :
XSTRNCPY(buffer, "Feature not compiled in", max);
break;
case UNICODE_SIZE_E :
XSTRNCPY(buffer, "Unicode password too big", max);
break;
case NO_PASSWORD :
XSTRNCPY(buffer, "No password provided by user", max);
break;
default:
XSTRNCPY(buffer, "unknown error number", max);
}
#endif /* NO_ERROR_STRINGS */
}
#if defined(CYASSL_KEY_GEN) || defined(CYASSL_CERT_GEN)
static int SetMyVersion(word32 version, byte* output, int header)
{
int i = 0;
if (header) {
output[i++] = ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED;
output[i++] = ASN_BIT_STRING;
}
output[i++] = ASN_INTEGER;
output[i++] = 0x01;
output[i++] = version;
return i;
}
int DerToPem(const byte* der, word32 derSz, byte* output, word32 outSz,
int type)
{
char header[80];
char footer[80];
int headerLen;
int footerLen;
int i;
int err;
int outLen; /* return length or error */
if (type == CERT_TYPE) {
XSTRNCPY(header, "-----BEGIN CERTIFICATE-----\n", sizeof(header));
XSTRNCPY(footer, "-----END CERTIFICATE-----\n", sizeof(footer));
} else {
XSTRNCPY(header, "-----BEGIN RSA PRIVATE KEY-----\n", sizeof(header));
XSTRNCPY(footer, "-----END RSA PRIVATE KEY-----\n", sizeof(footer));
}
headerLen = XSTRLEN(header);
footerLen = XSTRLEN(footer);
if (!der || !output)
return BAD_FUNC_ARG;
/* don't even try if outSz too short */
if (outSz < headerLen + footerLen + derSz)
return BAD_FUNC_ARG;
/* header */
XMEMCPY(output, header, headerLen);
i = headerLen;
/* body */
outLen = outSz; /* input to Base64Encode */
if ( (err = Base64Encode(der, derSz, output + i, (word32*)&outLen)) < 0)
return err;
i += outLen;
/* footer */
if ( (i + footerLen) > (int)outSz)
return BAD_FUNC_ARG;
XMEMCPY(output + i, footer, footerLen);
return outLen + headerLen + footerLen;
}
#endif /* CYASSL_KEY_GEN || CYASSL_CERT_GEN */
#ifdef CYASSL_KEY_GEN
static mp_int* GetRsaInt(RsaKey* key, int idx)
{
if (idx == 0)
return &key->n;
if (idx == 1)
return &key->e;
if (idx == 2)
return &key->d;
if (idx == 3)
return &key->p;
if (idx == 4)
return &key->q;
if (idx == 5)
return &key->dP;
if (idx == 6)
return &key->dQ;
if (idx == 7)
return &key->u;
return NULL;
}
/* Convert RsaKey key to DER format, write to output (inLen), return bytes
written */
int RsaKeyToDer(RsaKey* key, byte* output, word32 inLen)
{
word32 seqSz, verSz, rawLen, intTotalLen = 0;
word32 sizes[RSA_INTS];
int i, j, outLen;
byte seq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
byte tmps[RSA_INTS][MAX_RSA_INT_SZ];
if (!key || !output)
return BAD_FUNC_ARG;
if (key->type != RSA_PRIVATE)
return BAD_FUNC_ARG;
/* write all big ints from key to DER tmps */
for (i = 0; i < RSA_INTS; i++) {
mp_int* keyInt = GetRsaInt(key, i);
rawLen = mp_unsigned_bin_size(keyInt);
tmps[i][0] = ASN_INTEGER;
sizes[i] = SetLength(rawLen, tmps[i] + 1) + 1; /* int tag */
if ( (sizes[i] + rawLen) < sizeof(tmps[i])) {
int err = mp_to_unsigned_bin(keyInt, tmps[i] + sizes[i]);
if (err == MP_OKAY) {
sizes[i] += rawLen;
intTotalLen += sizes[i];
}
else
return err;
}
else
return ASN_INPUT_E;
}
/* make headers */
verSz = SetMyVersion(0, ver, FALSE);
seqSz = SetSequence(verSz + intTotalLen, seq);
outLen = seqSz + verSz + intTotalLen;
if (outLen > (int)inLen)
return BAD_FUNC_ARG;
/* write to output */
XMEMCPY(output, seq, seqSz);
j = seqSz;
XMEMCPY(output + j, ver, verSz);
j += verSz;
for (i = 0; i < RSA_INTS; i++) {
XMEMCPY(output + j, tmps[i], sizes[i]);
j += sizes[i];
}
return outLen;
}
#endif /* CYASSL_KEY_GEN */
#ifdef CYASSL_CERT_GEN
/* Initialize and Set Certficate defaults:
version = 3 (0x2)
serial = 0
sigType = MD5_WITH_RSA
issuer = blank
daysValid = 500
selfSigned = 1 (true) use subject as issuer
subject = blank
*/
void InitCert(Cert* cert)
{
cert->version = 2; /* version 3 is hex 2 */
cert->sigType = MD5wRSA;
cert->daysValid = 500;
cert->selfSigned = 1;
cert->bodySz = 0;
cert->keyType = RSA_KEY;
XMEMSET(cert->serial, 0, CTC_SERIAL_SIZE);
cert->issuer.country[0] = '\0';
cert->issuer.state[0] = '\0';
cert->issuer.locality[0] = '\0';
cert->issuer.sur[0] = '\0';
cert->issuer.org[0] = '\0';
cert->issuer.unit[0] = '\0';
cert->issuer.commonName[0] = '\0';
cert->issuer.email[0] = '\0';
cert->subject.country[0] = '\0';
cert->subject.state[0] = '\0';
cert->subject.locality[0] = '\0';
cert->subject.sur[0] = '\0';
cert->subject.org[0] = '\0';
cert->subject.unit[0] = '\0';
cert->subject.commonName[0] = '\0';
cert->subject.email[0] = '\0';
}
/* DER encoded x509 Certificate */
typedef struct DerCert {
byte size[MAX_LENGTH_SZ]; /* length encoded */
byte version[MAX_VERSION_SZ]; /* version encoded */
byte serial[CTC_SERIAL_SIZE + MAX_LENGTH_SZ]; /* serial number encoded */
byte sigAlgo[MAX_ALGO_SZ]; /* signature algo encoded */
byte issuer[ASN_NAME_MAX]; /* issuer encoded */
byte subject[ASN_NAME_MAX]; /* subject encoded */
byte validity[MAX_DATE_SIZE*2 + MAX_SEQ_SZ*2]; /* before and after dates */
byte publicKey[MAX_PUBLIC_KEY_SZ]; /* rsa / ntru public key encoded */
int sizeSz; /* encoded size length */
int versionSz; /* encoded version length */
int serialSz; /* encoded serial length */
int sigAlgoSz; /* enocded sig alog length */
int issuerSz; /* encoded issuer length */
int subjectSz; /* encoded subject length */
int validitySz; /* encoded validity length */
int publicKeySz; /* encoded public key length */
int total; /* total encoded lengths */
} DerCert;
/* Write a set header to output */
static word32 SetSet(word32 len, byte* output)
{
output[0] = ASN_SET | ASN_CONSTRUCTED;
return SetLength(len, output + 1) + 1;
}
/* Write a serial number to output */
static int SetSerial(const byte* serial, byte* output)
{
int length = 0;
output[length++] = ASN_INTEGER;
length += SetLength(CTC_SERIAL_SIZE, &output[length]);
XMEMCPY(&output[length], serial, CTC_SERIAL_SIZE);
return length + CTC_SERIAL_SIZE;
}
/* Write a public RSA key to output */
static int SetPublicKey(byte* output, RsaKey* key)
{
byte n[MAX_RSA_INT_SZ];
byte e[MAX_RSA_E_SZ];
byte algo[MAX_ALGO_SZ];
byte seq[MAX_SEQ_SZ];
byte len[MAX_LENGTH_SZ + 1]; /* trailing 0 */
int nSz;
int eSz;
int algoSz;
int seqSz;
int lenSz;
int idx;
int rawLen;
/* n */
rawLen = mp_unsigned_bin_size(&key->n);
n[0] = ASN_INTEGER;
nSz = SetLength(rawLen, n + 1) + 1; /* int tag */
if ( (nSz + rawLen) < (int)sizeof(n)) {
int err = mp_to_unsigned_bin(&key->n, n + nSz);
if (err == MP_OKAY)
nSz += rawLen;
else
return MP_TO_E;
}
else
return BUFFER_E;
/* e */
rawLen = mp_unsigned_bin_size(&key->e);
e[0] = ASN_INTEGER;
eSz = SetLength(rawLen, e + 1) + 1; /* int tag */
if ( (eSz + rawLen) < (int)sizeof(e)) {
int err = mp_to_unsigned_bin(&key->e, e + eSz);
if (err == MP_OKAY)
eSz += rawLen;
else
return MP_TO_E;
}
else
return BUFFER_E;
/* headers */
algoSz = SetAlgoID(RSAk, algo, keyType);
seqSz = SetSequence(nSz + eSz, seq);
lenSz = SetLength(seqSz + nSz + eSz + 1, len);
len[lenSz++] = 0; /* trailing 0 */
/* write */
idx = SetSequence(nSz + eSz + seqSz + lenSz + 1 + algoSz, output);
/* 1 is for ASN_BIT_STRING */
/* algo */
XMEMCPY(output + idx, algo, algoSz);
idx += algoSz;
/* bit string */
output[idx++] = ASN_BIT_STRING;
/* length */
XMEMCPY(output + idx, len, lenSz);
idx += lenSz;
/* seq */
XMEMCPY(output + idx, seq, seqSz);
idx += seqSz;
/* n */
XMEMCPY(output + idx, n, nSz);
idx += nSz;
/* e */
XMEMCPY(output + idx, e, eSz);
idx += eSz;
return idx;
}
static INLINE byte itob(int number)
{
return (byte)number + 0x30;
}
/* write time to output, format */
static void SetTime(struct tm* date, byte* output)
{
int i = 0;
output[i++] = itob((date->tm_year % 10000) / 1000);
output[i++] = itob((date->tm_year % 1000) / 100);
output[i++] = itob((date->tm_year % 100) / 10);
output[i++] = itob( date->tm_year % 10);
output[i++] = itob(date->tm_mon / 10);
output[i++] = itob(date->tm_mon % 10);
output[i++] = itob(date->tm_mday / 10);
output[i++] = itob(date->tm_mday % 10);
output[i++] = itob(date->tm_hour / 10);
output[i++] = itob(date->tm_hour % 10);
output[i++] = itob(date->tm_min / 10);
output[i++] = itob(date->tm_min % 10);
output[i++] = itob(date->tm_sec / 10);
output[i++] = itob(date->tm_sec % 10);
output[i] = 'Z'; /* Zulu profile */
}
/* Set Date validity from now until now + daysValid */
static int SetValidity(byte* output, int daysValid)
{
byte before[MAX_DATE_SIZE];
byte after[MAX_DATE_SIZE];
int beforeSz;
int afterSz;
int seqSz;
time_t ticks;
struct tm* now;
struct tm local;
ticks = XTIME(0);
now = XGMTIME(&ticks);
/* before now */
local = *now;
before[0] = ASN_GENERALIZED_TIME;
beforeSz = SetLength(ASN_GEN_TIME_SZ, before + 1) + 1; /* gen tag */
/* adjust */
local.tm_year += 1900;
local.tm_mon += 1;
SetTime(&local, before + beforeSz);
beforeSz += ASN_GEN_TIME_SZ;
/* after now + daysValid */
local = *now;
after[0] = ASN_GENERALIZED_TIME;
afterSz = SetLength(ASN_GEN_TIME_SZ, after + 1) + 1; /* gen tag */
/* add daysValid */
local.tm_mday += daysValid;
mktime(&local);
/* adjust */
local.tm_year += 1900;
local.tm_mon += 1;
SetTime(&local, after + afterSz);
afterSz += ASN_GEN_TIME_SZ;
/* headers and output */
seqSz = SetSequence(beforeSz + afterSz, output);
XMEMCPY(output + seqSz, before, beforeSz);
XMEMCPY(output + seqSz + beforeSz, after, afterSz);
return seqSz + beforeSz + afterSz;
}
/* ASN Encoded Name field */
typedef struct EncodedName {
int nameLen; /* actual string value length */
int totalLen; /* total encoded length */
int type; /* type of name */
int used; /* are we actually using this one */
byte encoded[CTC_NAME_SIZE * 2]; /* encoding */
} EncodedName;
/* Get Which Name from index */
static const char* GetOneName(CertName* name, int idx)
{
switch (idx) {
case 0:
return name->country;
break;
case 1:
return name->state;
break;
case 2:
return name->locality;
break;
case 3:
return name->sur;
break;
case 4:
return name->org;
break;
case 5:
return name->unit;
break;
case 6:
return name->commonName;
break;
case 7:
return name->email;
break;
default:
return 0;
}
return 0;
}
/* Get ASN Name from index */
static byte GetNameId(int idx)
{
switch (idx) {
case 0:
return ASN_COUNTRY_NAME;
break;
case 1:
return ASN_STATE_NAME;
break;
case 2:
return ASN_LOCALITY_NAME;
break;
case 3:
return ASN_SUR_NAME;
break;
case 4:
return ASN_ORG_NAME;
break;
case 5:
return ASN_ORGUNIT_NAME;
break;
case 6:
return ASN_COMMON_NAME;
break;
case 7:
/* email uses different id type */
return 0;
break;
default:
return 0;
}
return 0;
}
/* encode CertName into output, return total bytes written */
static int SetName(byte* output, CertName* name)
{
int totalBytes = 0, i, idx;
EncodedName names[NAME_ENTRIES];
for (i = 0; i < NAME_ENTRIES; i++) {
const char* nameStr = GetOneName(name, i);
if (nameStr) {
/* bottom up */
byte firstLen[MAX_LENGTH_SZ];
byte secondLen[MAX_LENGTH_SZ];
byte sequence[MAX_SEQ_SZ];
byte set[MAX_SET_SZ];
int email = i == (NAME_ENTRIES - 1) ? 1 : 0;
int strLen = XSTRLEN(nameStr);
int thisLen = strLen;
int firstSz, secondSz, seqSz, setSz;
if (strLen == 0) { /* no user data for this item */
names[i].used = 0;
continue;
}
secondSz = SetLength(strLen, secondLen);
thisLen += secondSz;
if (email) {
thisLen += EMAIL_JOINT_LEN;
thisLen ++; /* id type */
firstSz = SetLength(EMAIL_JOINT_LEN, firstLen);
}
else {
thisLen++; /* str type */
thisLen++; /* id type */
thisLen += JOINT_LEN;
firstSz = SetLength(JOINT_LEN + 1, firstLen);
}
thisLen += firstSz;
thisLen++; /* object id */
seqSz = SetSequence(thisLen, sequence);
thisLen += seqSz;
setSz = SetSet(thisLen, set);
thisLen += setSz;
if (thisLen > (int)sizeof(names[i].encoded))
return BUFFER_E;
/* store it */
idx = 0;
/* set */
XMEMCPY(names[i].encoded, set, setSz);
idx += setSz;
/* seq */
XMEMCPY(names[i].encoded + idx, sequence, seqSz);
idx += seqSz;
/* asn object id */
names[i].encoded[idx++] = ASN_OBJECT_ID;
/* first length */
XMEMCPY(names[i].encoded + idx, firstLen, firstSz);
idx += firstSz;
if (email) {
const byte EMAIL_OID[] = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x01, 0x09, 0x01, 0x16 };
/* email joint id */
XMEMCPY(names[i].encoded + idx, EMAIL_OID, sizeof(EMAIL_OID));
idx += sizeof(EMAIL_OID);
}
else {
/* joint id */
names[i].encoded[idx++] = 0x55;
names[i].encoded[idx++] = 0x04;
/* id type */
names[i].encoded[idx++] = GetNameId(i);
/* str type */
names[i].encoded[idx++] = 0x13;
}
/* second length */
XMEMCPY(names[i].encoded + idx, secondLen, secondSz);
idx += secondSz;
/* str value */
XMEMCPY(names[i].encoded + idx, nameStr, strLen);
idx += strLen;
totalBytes += idx;
names[i].totalLen = idx;
names[i].used = 1;
}
else
names[i].used = 0;
}
/* header */
idx = SetSequence(totalBytes, output);
totalBytes += idx;
if (totalBytes > ASN_NAME_MAX)
return BUFFER_E;
for (i = 0; i < NAME_ENTRIES; i++) {
if (names[i].used) {
XMEMCPY(output + idx, names[i].encoded, names[i].totalLen);
idx += names[i].totalLen;
}
}
return totalBytes;
}
/* encode info from cert into DER enocder format */
static int EncodeCert(Cert* cert, DerCert* der, RsaKey* rsaKey, RNG* rng,
const byte* ntruKey, word16 ntruSz)
{
(void)ntruKey;
(void)ntruSz;
/* version */
der->versionSz = SetMyVersion(cert->version, der->version, TRUE);
/* serial number */
RNG_GenerateBlock(rng, cert->serial, CTC_SERIAL_SIZE);
cert->serial[0] = 0x01; /* ensure positive */
der->serialSz = SetSerial(cert->serial, der->serial);
/* signature algo */
der->sigAlgoSz = SetAlgoID(cert->sigType, der->sigAlgo, sigType);
if (der->sigAlgoSz == 0)
return ALGO_ID_E;
/* public key */
if (cert->keyType == RSA_KEY) {
der->publicKeySz = SetPublicKey(der->publicKey, rsaKey);
if (der->publicKeySz == 0)
return PUBLIC_KEY_E;
}
else {
#ifdef HAVE_NTRU
word32 rc;
word16 encodedSz;
rc = crypto_ntru_encrypt_publicKey2SubjectPublicKeyInfo( ntruSz,
ntruKey, &encodedSz, NULL);
if (rc != NTRU_OK)
return PUBLIC_KEY_E;
if (encodedSz > MAX_PUBLIC_KEY_SZ)
return PUBLIC_KEY_E;
rc = crypto_ntru_encrypt_publicKey2SubjectPublicKeyInfo( ntruSz,
ntruKey, &encodedSz, der->publicKey);
if (rc != NTRU_OK)
return PUBLIC_KEY_E;
der->publicKeySz = encodedSz;
#endif
}
/* date validity */
der->validitySz = SetValidity(der->validity, cert->daysValid);
if (der->validitySz == 0)
return DATE_E;
/* subject name */
der->subjectSz = SetName(der->subject, &cert->subject);
if (der->subjectSz == 0)
return SUBJECT_E;
/* issuer name */
der->issuerSz = SetName(der->issuer, cert->selfSigned ?
&cert->subject : &cert->issuer);
if (der->issuerSz == 0)
return ISSUER_E;
der->total = der->versionSz + der->serialSz + der->sigAlgoSz +
der->publicKeySz + der->validitySz + der->subjectSz + der->issuerSz;
return 0;
}
/* write DER encoded cert to buffer, size already checked */
static int WriteCertBody(DerCert* der, byte* buffer)
{
int idx;
/* signed part header */
idx = SetSequence(der->total, buffer);
/* version */
XMEMCPY(buffer + idx, der->version, der->versionSz);
idx += der->versionSz;
/* serial */
XMEMCPY(buffer + idx, der->serial, der->serialSz);
idx += der->serialSz;
/* sig algo */
XMEMCPY(buffer + idx, der->sigAlgo, der->sigAlgoSz);
idx += der->sigAlgoSz;
/* issuer */
XMEMCPY(buffer + idx, der->issuer, der->issuerSz);
idx += der->issuerSz;
/* validity */
XMEMCPY(buffer + idx, der->validity, der->validitySz);
idx += der->validitySz;
/* subject */
XMEMCPY(buffer + idx, der->subject, der->subjectSz);
idx += der->subjectSz;
/* public key */
XMEMCPY(buffer + idx, der->publicKey, der->publicKeySz);
idx += der->publicKeySz;
return idx;
}
/* Make MD5wRSA signature from buffer (sz), write to sig (sigSz) */
static int MakeSignature(const byte* buffer, int sz, byte* sig, int sigSz,
RsaKey* key, RNG* rng)
{
byte digest[SHA_DIGEST_SIZE]; /* max size */
byte encSig[MAX_ENCODED_DIG_SZ + MAX_ALGO_SZ + MAX_SEQ_SZ];
int encSigSz, digestSz, typeH;
Md5 md5; /* md5 for now */
InitMd5(&md5);
Md5Update(&md5, buffer, sz);
Md5Final(&md5, digest);
digestSz = MD5_DIGEST_SIZE;
typeH = MD5h;
/* signature */
encSigSz = EncodeSignature(encSig, digest, digestSz, typeH);
return RsaSSL_Sign(encSig, encSigSz, sig, sigSz, key, rng);
}
/* add signature to end of buffer, size of buffer assumed checked, return
new length */
static int AddSignature(byte* buffer, int bodySz, const byte* sig, int sigSz)
{
byte seq[MAX_SEQ_SZ];
int idx = bodySz, seqSz;
/* algo */
idx += SetAlgoID(MD5wRSA, buffer + idx, sigType);
/* bit string */
buffer[idx++] = ASN_BIT_STRING;
/* length */
idx += SetLength(sigSz + 1, buffer + idx);
buffer[idx++] = 0; /* trailing 0 */
/* signature */
XMEMCPY(buffer + idx, sig, sigSz);
idx += sigSz;
/* make room for overall header */
seqSz = SetSequence(idx, seq);
XMEMMOVE(buffer + seqSz, buffer, idx);
XMEMCPY(buffer, seq, seqSz);
return idx + seqSz;
}
/* Make an x509 Certificate v3 any key type from cert input, write to buffer */
static int MakeAnyCert(Cert* cert, byte* derBuffer, word32 derSz,
RsaKey* rsaKey, RNG* rng, const byte* ntruKey, word16 ntruSz)
{
DerCert der;
int ret;
cert->keyType = rsaKey ? RSA_KEY : NTRU_KEY;
ret = EncodeCert(cert, &der, rsaKey, rng, ntruKey, ntruSz);
if (ret != 0)
return ret;
if (der.total + MAX_SEQ_SZ * 2 > (int)derSz)
return BUFFER_E;
return cert->bodySz = WriteCertBody(&der, derBuffer);
}
/* Make an x509 Certificate v3 RSA from cert input, write to buffer */
int MakeCert(Cert* cert, byte* derBuffer, word32 derSz, RsaKey* rsaKey,RNG* rng)
{
return MakeAnyCert(cert, derBuffer, derSz, rsaKey, rng, NULL, 0);
}
#ifdef HAVE_NTRU
int MakeNtruCert(Cert* cert, byte* derBuffer, word32 derSz,
const byte* ntruKey, word16 keySz, RNG* rng)
{
return MakeAnyCert(cert, derBuffer, derSz, NULL, rng, ntruKey, keySz);
}
#endif /* HAVE_NTRU */
int SignCert(Cert* cert, byte* buffer, word32 buffSz, RsaKey* key, RNG* rng)
{
byte sig[MAX_ENCODED_SIG_SZ];
int sigSz;
int bodySz = cert->bodySz;
if (bodySz < 0)
return bodySz;
sigSz = MakeSignature(buffer, bodySz, sig, sizeof(sig), key, rng);
if (sigSz < 0)
return sigSz;
if (bodySz + MAX_SEQ_SZ * 2 + sigSz > (int)buffSz)
return BUFFER_E;
return AddSignature(buffer, bodySz, sig, sigSz);
}
int MakeSelfCert(Cert* cert, byte* buffer, word32 buffSz, RsaKey* key, RNG* rng)
{
int ret = MakeCert(cert, buffer, buffSz, key, rng);
if (ret < 0)
return ret;
return SignCert(cert, buffer, buffSz, key, rng);
}
/* Set cn name from der buffer, return 0 on success */
static int SetNameFromCert(CertName* cn, const byte* der, int derSz)
{
DecodedCert decoded;
int ret;
int sz;
if (derSz < 0)
return derSz;
InitDecodedCert(&decoded, (byte*)der, derSz, 0);
ret = ParseCertRelative(&decoded, CA_TYPE, NO_VERIFY, 0);
if (ret < 0)
return ret;
if (decoded.subjectCN) {
sz = (decoded.subjectCNLen < CTC_NAME_SIZE) ? decoded.subjectCNLen :
CTC_NAME_SIZE - 1;
strncpy(cn->commonName, decoded.subjectCN, CTC_NAME_SIZE);
cn->commonName[sz] = 0;
}
if (decoded.subjectC) {
sz = (decoded.subjectCLen < CTC_NAME_SIZE) ? decoded.subjectCLen :
CTC_NAME_SIZE - 1;
strncpy(cn->country, decoded.subjectC, CTC_NAME_SIZE);
cn->country[sz] = 0;
}
if (decoded.subjectST) {
sz = (decoded.subjectSTLen < CTC_NAME_SIZE) ? decoded.subjectSTLen :
CTC_NAME_SIZE - 1;
strncpy(cn->state, decoded.subjectST, CTC_NAME_SIZE);
cn->state[sz] = 0;
}
if (decoded.subjectL) {
sz = (decoded.subjectLLen < CTC_NAME_SIZE) ? decoded.subjectLLen :
CTC_NAME_SIZE - 1;
strncpy(cn->locality, decoded.subjectL, CTC_NAME_SIZE);
cn->locality[sz] = 0;
}
if (decoded.subjectO) {
sz = (decoded.subjectOLen < CTC_NAME_SIZE) ? decoded.subjectOLen :
CTC_NAME_SIZE - 1;
strncpy(cn->org, decoded.subjectO, CTC_NAME_SIZE);
cn->org[sz] = 0;
}
if (decoded.subjectOU) {
sz = (decoded.subjectOULen < CTC_NAME_SIZE) ? decoded.subjectOULen :
CTC_NAME_SIZE - 1;
strncpy(cn->unit, decoded.subjectOU, CTC_NAME_SIZE);
cn->unit[sz] = 0;
}
if (decoded.subjectSN) {
sz = (decoded.subjectSNLen < CTC_NAME_SIZE) ? decoded.subjectSNLen :
CTC_NAME_SIZE - 1;
strncpy(cn->sur, decoded.subjectSN, CTC_NAME_SIZE);
cn->sur[sz] = 0;
}
if (decoded.subjectEmail) {
sz = (decoded.subjectEmailLen < CTC_NAME_SIZE) ?
decoded.subjectEmailLen : CTC_NAME_SIZE - 1;
strncpy(cn->email, decoded.subjectEmail, CTC_NAME_SIZE);
cn->email[sz] = 0;
}
FreeDecodedCert(&decoded);
return 0;
}
#ifndef NO_FILESYSTEM
/* forward from CyaSSL */
int CyaSSL_PemCertToDer(const char* fileName, unsigned char* derBuf, int derSz);
/* Set cert issuer from issuerFile in PEM */
int SetIssuer(Cert* cert, const char* issuerFile)
{
byte der[8192];
int derSz = CyaSSL_PemCertToDer(issuerFile, der, sizeof(der));
cert->selfSigned = 0;
return SetNameFromCert(&cert->issuer, der, derSz);
}
/* Set cert subject from subjectFile in PEM */
int SetSubject(Cert* cert, const char* subjectFile)
{
byte der[8192];
int derSz = CyaSSL_PemCertToDer(subjectFile, der, sizeof(der));
return SetNameFromCert(&cert->subject, der, derSz);
}
#endif /* NO_FILESYSTEM */
/* Set cert issuer from DER buffer */
int SetIssuerBuffer(Cert* cert, const byte* der, int derSz)
{
cert->selfSigned = 0;
return SetNameFromCert(&cert->issuer, der, derSz);
}
/* Set cert subject from DER buffer */
int SetSubjectBuffer(Cert* cert, const byte* der, int derSz)
{
return SetNameFromCert(&cert->subject, der, derSz);
}
#endif /* CYASSL_CERT_GEN */
#ifdef HAVE_ECC
/* Der Encode r & s ints into out, outLen is (in/out) size */
int StoreECC_DSA_Sig(byte* out, word32* outLen, mp_int* r, mp_int* s)
{
word32 idx = 0;
word32 rSz; /* encoding size */
word32 sSz;
word32 headerSz = 4; /* 2*ASN_TAG + 2*LEN(ENUM) */
int rLen = mp_unsigned_bin_size(r); /* big int size */
int sLen = mp_unsigned_bin_size(s);
int err;
if (*outLen < (rLen + sLen + headerSz + 2)) /* SEQ_TAG + LEN(ENUM) */
return BAD_FUNC_ARG;
idx = SetSequence(rLen + sLen + headerSz, out);
/* store r */
out[idx++] = ASN_INTEGER;
rSz = SetLength(rLen, &out[idx]);
idx += rSz;
err = mp_to_unsigned_bin(r, &out[idx]);
if (err != MP_OKAY) return err;
idx += rLen;
/* store s */
out[idx++] = ASN_INTEGER;
sSz = SetLength(sLen, &out[idx]);
idx += sSz;
err = mp_to_unsigned_bin(s, &out[idx]);
if (err != MP_OKAY) return err;
idx += sLen;
*outLen = idx;
return 0;
}
/* Der Decode ECC-DSA Signautre, r & s stored as big ints */
int DecodeECC_DSA_Sig(const byte* sig, word32 sigLen, mp_int* r, mp_int* s)
{
word32 idx = 0;
int len = 0;
if (GetSequence(sig, &idx, &len, sigLen) < 0)
return ASN_ECC_KEY_E;
if ((word32)len > (sigLen - idx))
return ASN_ECC_KEY_E;
if (GetInt(r, sig, &idx, sigLen) < 0)
return ASN_ECC_KEY_E;
if (GetInt(s, sig, &idx, sigLen) < 0)
return ASN_ECC_KEY_E;
return 0;
}
int EccPrivateKeyDecode(const byte* input, word32* inOutIdx, ecc_key* key,
word32 inSz)
{
word32 oid = 0;
int version, length;
int privSz, pubSz;
byte b;
byte priv[ECC_MAXSIZE];
byte pub[ECC_MAXSIZE * 2 + 1]; /* public key has two parts plus header */
if (GetSequence(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(input, inOutIdx, &version) < 0)
return ASN_PARSE_E;
b = input[*inOutIdx];
*inOutIdx += 1;
/* priv type */
if (b != 4 && b != 6 && b != 7)
return ASN_PARSE_E;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
/* priv key */
privSz = length;
XMEMCPY(priv, &input[*inOutIdx], privSz);
*inOutIdx += length;
/* prefix 0 */
b = input[*inOutIdx];
*inOutIdx += 1;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
/* object id */
b = input[*inOutIdx];
*inOutIdx += 1;
if (b != ASN_OBJECT_ID)
return ASN_OBJECT_ID_E;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
while(length--) {
oid += input[*inOutIdx];
*inOutIdx += 1;
}
if (CheckCurve(oid) < 0)
return ECC_CURVE_OID_E;
/* prefix 1 */
b = input[*inOutIdx];
*inOutIdx += 1;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
/* key header */
b = input[*inOutIdx];
*inOutIdx += 1;
if (b != ASN_BIT_STRING)
return ASN_BITSTR_E;
if (GetLength(input, inOutIdx, &length, inSz) < 0)
return ASN_PARSE_E;
b = input[*inOutIdx];
*inOutIdx += 1;
if (b != 0x00)
return ASN_EXPECT_0_E;
pubSz = length - 1; /* null prefix */
XMEMCPY(pub, &input[*inOutIdx], pubSz);
*inOutIdx += length;
return ecc_import_private_key(priv, privSz, pub, pubSz, key);
}
#endif /* HAVE_ECC */
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