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wolfssl/wolfcrypt/src/ed25519.c

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/* ed25519.c
*
* Copyright (C) 2006-2021 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL 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.
*
* wolfSSL 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/* Based On Daniel J Bernstein's ed25519 Public Domain ref10 work. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* in case user set HAVE_ED25519 there */
#include <wolfssl/wolfcrypt/settings.h>
#ifdef HAVE_ED25519
#include <wolfssl/wolfcrypt/ed25519.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/wolfcrypt/hash.h>
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#define WOLFSSL_MISC_INCLUDED
#include <wolfcrypt/src/misc.c>
#endif
#ifdef FREESCALE_LTC_ECC
#include <wolfssl/wolfcrypt/port/nxp/ksdk_port.h>
#endif
#ifdef WOLF_CRYPTO_CB
#include <wolfssl/wolfcrypt/cryptocb.h>
#endif
#if defined(HAVE_ED25519_SIGN) || defined(HAVE_ED25519_VERIFY)
#define ED25519CTX_SIZE 32
static const byte ed25519Ctx[ED25519CTX_SIZE+1] =
"SigEd25519 no Ed25519 collisions";
#endif
static int ed25519_hash_init(ed25519_key* key, wc_Sha512 *sha)
{
int ret;
ret = wc_InitSha512_ex(sha, key->heap,
#if defined(WOLF_CRYPTO_CB)
key->devId
#else
INVALID_DEVID
#endif
);
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
if (ret == 0)
key->sha_clean_flag = 1;
#endif
return ret;
}
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
static int ed25519_hash_reset(ed25519_key* key)
{
int ret;
if (key->sha_clean_flag)
ret = 0;
else {
wc_Sha512Free(&key->sha);
ret = wc_InitSha512_ex(&key->sha, key->heap,
#if defined(WOLF_CRYPTO_CB)
key->devId
#else
INVALID_DEVID
#endif
);
if (ret == 0)
key->sha_clean_flag = 1;
}
return ret;
}
#endif /* WOLFSSL_ED25519_PERSISTENT_SHA */
static int ed25519_hash_update(ed25519_key* key, wc_Sha512 *sha,
const byte* data, word32 len)
{
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
if (key->sha_clean_flag)
key->sha_clean_flag = 0;
#else
(void)key;
#endif
return wc_Sha512Update(sha, data, len);
}
static int ed25519_hash_final(ed25519_key* key, wc_Sha512 *sha, byte* hash)
{
int ret = wc_Sha512Final(sha, hash);
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
if (ret == 0)
key->sha_clean_flag = 1;
#else
(void)key;
#endif
return ret;
}
static void ed25519_hash_free(ed25519_key* key, wc_Sha512 *sha)
{
wc_Sha512Free(sha);
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
key->sha_clean_flag = 0;
#else
(void)key;
#endif
}
static int ed25519_hash(ed25519_key* key, const byte* in, word32 inLen,
byte* hash)
{
int ret;
#ifndef WOLFSSL_ED25519_PERSISTENT_SHA
wc_Sha512 sha[1];
#else
wc_Sha512 *sha;
#endif
if (key == NULL || (in == NULL && inLen > 0) || hash == NULL) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
sha = &key->sha;
ret = ed25519_hash_reset(key);
#else
ret = ed25519_hash_init(key, sha);
#endif
if (ret < 0)
return ret;
ret = ed25519_hash_update(key, sha, in, inLen);
if (ret == 0)
ret = ed25519_hash_final(key, sha, hash);
#ifndef WOLFSSL_ED25519_PERSISTENT_SHA
ed25519_hash_free(key, sha);
#endif
return ret;
}
int wc_ed25519_make_public(ed25519_key* key, unsigned char* pubKey,
word32 pubKeySz)
{
int ret = 0;
byte az[ED25519_PRV_KEY_SIZE];
#if !defined(FREESCALE_LTC_ECC)
ge_p3 A;
#endif
if (key == NULL || pubKey == NULL || pubKeySz != ED25519_PUB_KEY_SIZE)
ret = BAD_FUNC_ARG;
if (ret == 0)
ret = ed25519_hash(key, key->k, ED25519_KEY_SIZE, az);
if (ret == 0) {
/* apply clamp */
az[0] &= 248;
az[31] &= 63; /* same than az[31] &= 127 because of az[31] |= 64 */
az[31] |= 64;
#ifdef FREESCALE_LTC_ECC
ltc_pkha_ecc_point_t publicKey = {0};
publicKey.X = key->pointX;
publicKey.Y = key->pointY;
LTC_PKHA_Ed25519_PointMul(LTC_PKHA_Ed25519_BasePoint(), az,
ED25519_KEY_SIZE, &publicKey, kLTC_Ed25519 /* result on Ed25519 */);
LTC_PKHA_Ed25519_Compress(&publicKey, pubKey);
#else
ge_scalarmult_base(&A, az);
ge_p3_tobytes(pubKey, &A);
#endif
}
return ret;
}
/* generate an ed25519 key pair.
* returns 0 on success
*/
int wc_ed25519_make_key(WC_RNG* rng, int keySz, ed25519_key* key)
{
int ret;
if (rng == NULL || key == NULL)
return BAD_FUNC_ARG;
/* ed25519 has 32 byte key sizes */
if (keySz != ED25519_KEY_SIZE)
return BAD_FUNC_ARG;
#ifdef WOLF_CRYPTO_CB
if (key->devId != INVALID_DEVID) {
ret = wc_CryptoCb_Ed25519Gen(rng, keySz, key);
if (ret != CRYPTOCB_UNAVAILABLE)
return ret;
/* fall-through when unavailable */
}
#endif
ret = wc_RNG_GenerateBlock(rng, key->k, ED25519_KEY_SIZE);
if (ret != 0)
return ret;
ret = wc_ed25519_make_public(key, key->p, ED25519_PUB_KEY_SIZE);
if (ret != 0) {
ForceZero(key->k, ED25519_KEY_SIZE);
return ret;
}
/* put public key after private key, on the same buffer */
XMEMMOVE(key->k + ED25519_KEY_SIZE, key->p, ED25519_PUB_KEY_SIZE);
key->pubKeySet = 1;
return ret;
}
#ifdef HAVE_ED25519_SIGN
/*
in contains the message to sign
inLen is the length of the message to sign
out is the buffer to write the signature
outLen [in/out] input size of out buf
output gets set as the final length of out
key is the ed25519 key to use when signing
type one of Ed25519, Ed25519ctx or Ed25519ph
context extra signing data
contextLen length of extra signing data
return 0 on success
*/
int wc_ed25519_sign_msg_ex(const byte* in, word32 inLen, byte* out,
word32 *outLen, ed25519_key* key, byte type,
const byte* context, byte contextLen)
{
int ret;
#ifdef WOLFSSL_SE050
(void)context;
(void)contextLen;
(void)type;
ret = se050_ed25519_sign_msg(in, inLen, out, outLen, key);
#else
#ifdef FREESCALE_LTC_ECC
byte tempBuf[ED25519_PRV_KEY_SIZE];
ltc_pkha_ecc_point_t ltcPoint = {0};
#else
ge_p3 R;
#endif
byte nonce[WC_SHA512_DIGEST_SIZE];
byte hram[WC_SHA512_DIGEST_SIZE];
byte az[ED25519_PRV_KEY_SIZE];
/* sanity check on arguments */
if (in == NULL || out == NULL || outLen == NULL || key == NULL ||
(context == NULL && contextLen != 0)) {
return BAD_FUNC_ARG;
}
#ifdef WOLF_CRYPTO_CB
if (key->devId != INVALID_DEVID) {
ret = wc_CryptoCb_Ed25519Sign(in, inLen, out, outLen, key, type,
context, contextLen);
if (ret != CRYPTOCB_UNAVAILABLE)
return ret;
/* fall-through when unavailable */
}
#endif
if (!key->pubKeySet)
return BAD_FUNC_ARG;
/* check and set up out length */
if (*outLen < ED25519_SIG_SIZE) {
*outLen = ED25519_SIG_SIZE;
return BUFFER_E;
}
*outLen = ED25519_SIG_SIZE;
/* step 1: create nonce to use where nonce is r in
r = H(h_b, ... ,h_2b-1,M) */
ret = ed25519_hash(key, key->k, ED25519_KEY_SIZE, az);
if (ret != 0)
return ret;
/* apply clamp */
az[0] &= 248;
az[31] &= 63; /* same than az[31] &= 127 because of az[31] |= 64 */
az[31] |= 64;
{
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
wc_Sha512 *sha = &key->sha;
#else
wc_Sha512 sha[1];
ret = ed25519_hash_init(key, sha);
if (ret < 0)
return ret;
#endif
if (type == Ed25519ctx || type == Ed25519ph) {
ret = ed25519_hash_update(key, sha, ed25519Ctx, ED25519CTX_SIZE);
if (ret == 0)
ret = ed25519_hash_update(key, sha, &type, sizeof(type));
if (ret == 0)
ret = ed25519_hash_update(key, sha, &contextLen,
sizeof(contextLen));
if (ret == 0 && context != NULL)
ret = ed25519_hash_update(key, sha, context, contextLen);
}
if (ret == 0)
ret = ed25519_hash_update(key, sha, az + ED25519_KEY_SIZE,
ED25519_KEY_SIZE);
if (ret == 0)
ret = ed25519_hash_update(key, sha, in, inLen);
if (ret == 0)
ret = ed25519_hash_final(key, sha, nonce);
#ifndef WOLFSSL_ED25519_PERSISTENT_SHA
ed25519_hash_free(key, sha);
#endif
}
if (ret != 0)
return ret;
#ifdef FREESCALE_LTC_ECC
ltcPoint.X = &tempBuf[0];
ltcPoint.Y = &tempBuf[32];
LTC_PKHA_sc_reduce(nonce);
LTC_PKHA_Ed25519_PointMul(LTC_PKHA_Ed25519_BasePoint(), nonce,
ED25519_KEY_SIZE, &ltcPoint, kLTC_Ed25519 /* result on Ed25519 */);
LTC_PKHA_Ed25519_Compress(&ltcPoint, out);
#else
sc_reduce(nonce);
/* step 2: computing R = rB where rB is the scalar multiplication of
r and B */
ge_scalarmult_base(&R,nonce);
ge_p3_tobytes(out,&R);
#endif
/* step 3: hash R + public key + message getting H(R,A,M) then
creating S = (r + H(R,A,M)a) mod l */
{
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
wc_Sha512 *sha = &key->sha;
#else
wc_Sha512 sha[1];
ret = ed25519_hash_init(key, sha);
if (ret < 0)
return ret;
#endif
if (type == Ed25519ctx || type == Ed25519ph) {
ret = ed25519_hash_update(key, sha, ed25519Ctx, ED25519CTX_SIZE);
if (ret == 0)
ret = ed25519_hash_update(key, sha, &type, sizeof(type));
if (ret == 0)
ret = ed25519_hash_update(key, sha, &contextLen,
sizeof(contextLen));
if (ret == 0 && context != NULL)
ret = ed25519_hash_update(key, sha, context, contextLen);
}
if (ret == 0)
ret = ed25519_hash_update(key, sha, out, ED25519_SIG_SIZE/2);
if (ret == 0)
ret = ed25519_hash_update(key, sha, key->p, ED25519_PUB_KEY_SIZE);
if (ret == 0)
ret = ed25519_hash_update(key, sha, in, inLen);
if (ret == 0)
ret = ed25519_hash_final(key, sha, hram);
#ifndef WOLFSSL_ED25519_PERSISTENT_SHA
ed25519_hash_free(key, sha);
#endif
}
if (ret != 0)
return ret;
#ifdef FREESCALE_LTC_ECC
LTC_PKHA_sc_reduce(hram);
LTC_PKHA_sc_muladd(out + (ED25519_SIG_SIZE/2), hram, az, nonce);
#else
sc_reduce(hram);
sc_muladd(out + (ED25519_SIG_SIZE/2), hram, az, nonce);
#endif
#endif /* WOLFSSL_SE050 */
return ret;
}
/*
in contains the message to sign
inLen is the length of the message to sign
out is the buffer to write the signature
outLen [in/out] input size of out buf
output gets set as the final length of out
key is the ed25519 key to use when signing
return 0 on success
*/
int wc_ed25519_sign_msg(const byte* in, word32 inLen, byte* out,
word32 *outLen, ed25519_key* key)
{
return wc_ed25519_sign_msg_ex(in, inLen, out, outLen, key, (byte)Ed25519,
NULL, 0);
}
/*
in contains the message to sign
inLen is the length of the message to sign
out is the buffer to write the signature
outLen [in/out] input size of out buf
output gets set as the final length of out
key is the ed25519 key to use when signing
context extra signing data
contextLen length of extra signing data
return 0 on success
*/
int wc_ed25519ctx_sign_msg(const byte* in, word32 inLen, byte* out,
word32 *outLen, ed25519_key* key,
const byte* context, byte contextLen)
{
return wc_ed25519_sign_msg_ex(in, inLen, out, outLen, key, Ed25519ctx,
context, contextLen);
}
/*
hash contains the SHA-512 hash of the message to sign
hashLen is the length of the SHA-512 hash of the message to sign
out is the buffer to write the signature
outLen [in/out] input size of out buf
output gets set as the final length of out
key is the ed25519 key to use when signing
context extra signing data
contextLen length of extra signing data
return 0 on success
*/
int wc_ed25519ph_sign_hash(const byte* hash, word32 hashLen, byte* out,
word32 *outLen, ed25519_key* key,
const byte* context, byte contextLen)
{
return wc_ed25519_sign_msg_ex(hash, hashLen, out, outLen, key, Ed25519ph,
context, contextLen);
}
/*
in contains the message to sign
inLen is the length of the message to sign
out is the buffer to write the signature
outLen [in/out] input size of out buf
output gets set as the final length of out
key is the ed25519 key to use when signing
context extra signing data
contextLen length of extra signing data
return 0 on success
*/
int wc_ed25519ph_sign_msg(const byte* in, word32 inLen, byte* out,
word32 *outLen, ed25519_key* key,
const byte* context, byte contextLen)
{
int ret;
byte hash[WC_SHA512_DIGEST_SIZE];
ret = ed25519_hash(key, in, inLen, hash);
if (ret != 0)
return ret;
return wc_ed25519_sign_msg_ex(hash, sizeof(hash), out, outLen, key,
Ed25519ph, context, contextLen);
}
#endif /* HAVE_ED25519_SIGN */
#ifdef HAVE_ED25519_VERIFY
#ifndef WOLFSSL_SE050
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
key Ed25519 public key
return 0 on success
type variant to use -- Ed25519, Ed25519ctx, or Ed25519ph
context extra signing data
contextLen length of extra signing data
*/
static int ed25519_verify_msg_init_with_sha(const byte* sig, word32 sigLen,
ed25519_key* key, wc_Sha512 *sha,
byte type, const byte* context,
byte contextLen)
{
int ret;
/* sanity check on arguments */
if (sig == NULL || key == NULL ||
(context == NULL && contextLen != 0)) {
return BAD_FUNC_ARG;
}
/* check on basics needed to verify signature */
if (sigLen != ED25519_SIG_SIZE || (sig[ED25519_SIG_SIZE-1] & 224))
return BAD_FUNC_ARG;
/* find H(R,A,M) and store it as h */
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
ret = ed25519_hash_reset(key);
if (ret != 0)
return ret;
#else
ret = 0;
#endif
if (type == Ed25519ctx || type == Ed25519ph) {
ret = ed25519_hash_update(key, sha, ed25519Ctx, ED25519CTX_SIZE);
if (ret == 0)
ret = ed25519_hash_update(key, sha, &type, sizeof(type));
if (ret == 0)
ret = ed25519_hash_update(key, sha, &contextLen, sizeof(contextLen));
if (ret == 0 && context != NULL)
ret = ed25519_hash_update(key, sha, context, contextLen);
}
if (ret == 0)
ret = ed25519_hash_update(key, sha, sig, ED25519_SIG_SIZE/2);
if (ret == 0)
ret = ed25519_hash_update(key, sha, key->p, ED25519_PUB_KEY_SIZE);
return ret;
}
/*
msgSegment an array of bytes containing a message segment
msgSegmentLen length of msgSegment
key Ed25519 public key
return 0 on success
*/
static int ed25519_verify_msg_update_with_sha(const byte* msgSegment,
word32 msgSegmentLen,
ed25519_key* key,
wc_Sha512 *sha) {
/* sanity check on arguments */
if (msgSegment == NULL || key == NULL)
return BAD_FUNC_ARG;
return ed25519_hash_update(key, sha, msgSegment, msgSegmentLen);
}
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
res will be 1 on successful verify and 0 on unsuccessful
key Ed25519 public key
return 0 and res of 1 on success
*/
static int ed25519_verify_msg_final_with_sha(const byte* sig, word32 sigLen,
int* res, ed25519_key* key,
wc_Sha512 *sha)
{
byte rcheck[ED25519_KEY_SIZE];
byte h[WC_SHA512_DIGEST_SIZE];
#ifndef FREESCALE_LTC_ECC
ge_p3 A;
ge_p2 R;
#endif
int ret;
/* sanity check on arguments */
if (sig == NULL || res == NULL || key == NULL)
return BAD_FUNC_ARG;
/* set verification failed by default */
*res = 0;
/* check on basics needed to verify signature */
if (sigLen != ED25519_SIG_SIZE || (sig[ED25519_SIG_SIZE-1] & 224))
return BAD_FUNC_ARG;
/* uncompress A (public key), test if valid, and negate it */
#ifndef FREESCALE_LTC_ECC
if (ge_frombytes_negate_vartime(&A, key->p) != 0)
return BAD_FUNC_ARG;
#endif
/* find H(R,A,M) and store it as h */
ret = ed25519_hash_final(key, sha, h);
if (ret != 0)
return ret;
#ifdef FREESCALE_LTC_ECC
LTC_PKHA_sc_reduce(h);
LTC_PKHA_SignatureForVerify(rcheck, h, sig + (ED25519_SIG_SIZE/2), key);
#else
sc_reduce(h);
/*
Uses a fast single-signature verification SB = R + H(R,A,M)A becomes
SB - H(R,A,M)A saving decompression of R
*/
ret = ge_double_scalarmult_vartime(&R, h, &A, sig + (ED25519_SIG_SIZE/2));
if (ret != 0)
return ret;
ge_tobytes(rcheck, &R);
#endif /* FREESCALE_LTC_ECC */
/* comparison of R created to R in sig */
ret = ConstantCompare(rcheck, sig, ED25519_SIG_SIZE/2);
if (ret != 0) {
ret = SIG_VERIFY_E;
} else {
/* set the verification status */
*res = 1;
}
return ret;
}
#endif /* WOLFSSL_SE050 */
#ifdef WOLFSSL_ED25519_STREAMING_VERIFY
int wc_ed25519_verify_msg_init(const byte* sig, word32 sigLen, ed25519_key* key,
byte type, const byte* context, byte contextLen) {
return ed25519_verify_msg_init_with_sha(sig, sigLen, key, &key->sha,
type, context, contextLen);
}
int wc_ed25519_verify_msg_update(const byte* msgSegment, word32 msgSegmentLen,
ed25519_key* key) {
return ed25519_verify_msg_update_with_sha(msgSegment, msgSegmentLen,
key, &key->sha);
}
int wc_ed25519_verify_msg_final(const byte* sig, word32 sigLen, int* res,
ed25519_key* key) {
return ed25519_verify_msg_final_with_sha(sig, sigLen, res,
key, &key->sha);
}
#endif /* WOLFSSL_ED25519_STREAMING_VERIFY */
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
msg the array of bytes containing the message
msgLen length of msg array
res will be 1 on successful verify and 0 on unsuccessful
key Ed25519 public key
return 0 and res of 1 on success
*/
int wc_ed25519_verify_msg_ex(const byte* sig, word32 sigLen, const byte* msg,
word32 msgLen, int* res, ed25519_key* key,
byte type, const byte* context, byte contextLen)
{
int ret;
#ifdef WOLFSSL_SE050
(void)type;
(void)context;
(void)contextLen;
(void)ed25519Ctx;
ret = se050_ed25519_verify_msg(sig, sigLen, msg, msgLen, key, res);
#else
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
wc_Sha512 *sha;
#else
wc_Sha512 sha[1];
#endif
/* sanity check on arguments */
if (sig == NULL || msg == NULL || res == NULL || key == NULL ||
(context == NULL && contextLen != 0))
return BAD_FUNC_ARG;
#ifdef WOLF_CRYPTO_CB
if (key->devId != INVALID_DEVID) {
ret = wc_CryptoCb_Ed25519Verify(sig, sigLen, msg, msgLen, res, key,
type, context, contextLen);
if (ret != CRYPTOCB_UNAVAILABLE)
return ret;
/* fall-through when unavailable */
}
#endif
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
sha = &key->sha;
#else
ret = ed25519_hash_init(key, sha);
if (ret < 0)
return ret;
#endif
ret = ed25519_verify_msg_init_with_sha(sig, sigLen, key, sha, type, context,
contextLen);
if (ret == 0)
ret = ed25519_verify_msg_update_with_sha(msg, msgLen, key, sha);
if (ret == 0)
ret = ed25519_verify_msg_final_with_sha(sig, sigLen, res, key, sha);
#ifndef WOLFSSL_ED25519_PERSISTENT_SHA
ed25519_hash_free(key, sha);
#endif
#endif /* WOLFSSL_SE050 */
return ret;
}
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
msg the array of bytes containing the message
msgLen length of msg array
res will be 1 on successful verify and 0 on unsuccessful
key Ed25519 public key
return 0 and res of 1 on success
*/
int wc_ed25519_verify_msg(const byte* sig, word32 sigLen, const byte* msg,
word32 msgLen, int* res, ed25519_key* key)
{
return wc_ed25519_verify_msg_ex(sig, sigLen, msg, msgLen, res, key,
(byte)Ed25519, NULL, 0);
}
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
msg the array of bytes containing the message
msgLen length of msg array
res will be 1 on successful verify and 0 on unsuccessful
key Ed25519 public key
context extra signing data
contextLen length of extra signing data
return 0 and res of 1 on success
*/
int wc_ed25519ctx_verify_msg(const byte* sig, word32 sigLen, const byte* msg,
word32 msgLen, int* res, ed25519_key* key,
const byte* context, byte contextLen)
{
return wc_ed25519_verify_msg_ex(sig, sigLen, msg, msgLen, res, key,
Ed25519ctx, context, contextLen);
}
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
hash the array of bytes containing the SHA-512 hash of the message
hashLen length of hash array
res will be 1 on successful verify and 0 on unsuccessful
key Ed25519 public key
context extra signing data
contextLen length of extra signing data
return 0 and res of 1 on success
*/
int wc_ed25519ph_verify_hash(const byte* sig, word32 sigLen, const byte* hash,
word32 hashLen, int* res, ed25519_key* key,
const byte* context, byte contextLen)
{
return wc_ed25519_verify_msg_ex(sig, sigLen, hash, hashLen, res, key,
Ed25519ph, context, contextLen);
}
/*
sig is array of bytes containing the signature
sigLen is the length of sig byte array
msg the array of bytes containing the message
msgLen length of msg array
res will be 1 on successful verify and 0 on unsuccessful
key Ed25519 public key
context extra signing data
contextLen length of extra signing data
return 0 and res of 1 on success
*/
int wc_ed25519ph_verify_msg(const byte* sig, word32 sigLen, const byte* msg,
word32 msgLen, int* res, ed25519_key* key,
const byte* context, byte contextLen)
{
int ret;
byte hash[WC_SHA512_DIGEST_SIZE];
ret = ed25519_hash(key, msg, msgLen, hash);
if (ret != 0)
return ret;
return wc_ed25519_verify_msg_ex(sig, sigLen, hash, sizeof(hash), res, key,
Ed25519ph, context, contextLen);
}
#endif /* HAVE_ED25519_VERIFY */
/* initialize information and memory for key */
int wc_ed25519_init_ex(ed25519_key* key, void* heap, int devId)
{
if (key == NULL)
return BAD_FUNC_ARG;
XMEMSET(key, 0, sizeof(ed25519_key));
#ifdef WOLF_CRYPTO_CB
key->devId = devId;
#else
(void)devId;
#endif
key->heap = heap;
#ifndef FREESCALE_LTC_ECC
fe_init();
#endif
#ifdef WOLFSSL_SE050
se050_ed25519_create_key(key);
#endif
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
return ed25519_hash_init(key, &key->sha);
#else /* !WOLFSSL_ED25519_PERSISTENT_SHA */
return 0;
#endif /* WOLFSSL_ED25519_PERSISTENT_SHA */
}
int wc_ed25519_init(ed25519_key* key)
{
return wc_ed25519_init_ex(key, NULL, INVALID_DEVID);
}
/* clear memory of key */
void wc_ed25519_free(ed25519_key* key)
{
if (key == NULL)
return;
#ifdef WOLFSSL_ED25519_PERSISTENT_SHA
ed25519_hash_free(key, &key->sha);
#endif
#ifdef WOLFSSL_SE050
se050_ed25519_free_key(key);
#endif
ForceZero(key, sizeof(ed25519_key));
}
#ifdef HAVE_ED25519_KEY_EXPORT
/*
outLen should contain the size of out buffer when input. outLen is than set
to the final output length.
returns 0 on success
*/
int wc_ed25519_export_public(ed25519_key* key, byte* out, word32* outLen)
{
/* sanity check on arguments */
if (key == NULL || out == NULL || outLen == NULL)
return BAD_FUNC_ARG;
if (*outLen < ED25519_PUB_KEY_SIZE) {
*outLen = ED25519_PUB_KEY_SIZE;
return BUFFER_E;
}
*outLen = ED25519_PUB_KEY_SIZE;
XMEMCPY(out, key->p, ED25519_PUB_KEY_SIZE);
return 0;
}
#endif /* HAVE_ED25519_KEY_EXPORT */
#ifdef HAVE_ED25519_KEY_IMPORT
/*
Imports a compressed/uncompressed public key.
in the byte array containing the public key
inLen the length of the byte array being passed in
key ed25519 key struct to put the public key in
*/
int wc_ed25519_import_public(const byte* in, word32 inLen, ed25519_key* key)
{
int ret;
/* sanity check on arguments */
if (in == NULL || key == NULL)
return BAD_FUNC_ARG;
if (inLen < ED25519_PUB_KEY_SIZE)
return BAD_FUNC_ARG;
/* compressed prefix according to draft
http://www.ietf.org/id/draft-koch-eddsa-for-openpgp-02.txt */
if (in[0] == 0x40 && inLen > ED25519_PUB_KEY_SIZE) {
/* key is stored in compressed format so just copy in */
XMEMCPY(key->p, (in + 1), ED25519_PUB_KEY_SIZE);
#ifdef FREESCALE_LTC_ECC
/* recover X coordinate */
ltc_pkha_ecc_point_t pubKey;
pubKey.X = key->pointX;
pubKey.Y = key->pointY;
LTC_PKHA_Ed25519_PointDecompress(key->p, ED25519_PUB_KEY_SIZE, &pubKey);
#endif
key->pubKeySet = 1;
return 0;
}
/* importing uncompressed public key */
if (in[0] == 0x04 && inLen > 2*ED25519_PUB_KEY_SIZE) {
#ifdef FREESCALE_LTC_ECC
/* reverse bytes for little endian byte order */
for (int i = 0; i < ED25519_KEY_SIZE; i++)
{
key->pointX[i] = *(in + ED25519_KEY_SIZE - i);
key->pointY[i] = *(in + 2*ED25519_KEY_SIZE - i);
}
XMEMCPY(key->p, key->pointY, ED25519_KEY_SIZE);
key->pubKeySet = 1;
ret = 0;
#else
/* pass in (x,y) and store compressed key */
ret = ge_compress_key(key->p, in+1,
in+1+ED25519_PUB_KEY_SIZE, ED25519_PUB_KEY_SIZE);
if (ret == 0)
key->pubKeySet = 1;
#endif /* FREESCALE_LTC_ECC */
return ret;
}
/* if not specified compressed or uncompressed check key size
if key size is equal to compressed key size copy in key */
if (inLen == ED25519_PUB_KEY_SIZE) {
XMEMCPY(key->p, in, ED25519_PUB_KEY_SIZE);
#ifdef FREESCALE_LTC_ECC
/* recover X coordinate */
ltc_pkha_ecc_point_t pubKey;
pubKey.X = key->pointX;
pubKey.Y = key->pointY;
LTC_PKHA_Ed25519_PointDecompress(key->p, ED25519_PUB_KEY_SIZE, &pubKey);
#endif
key->pubKeySet = 1;
return 0;
}
/* bad public key format */
return BAD_FUNC_ARG;
}
/*
For importing a private key.
*/
int wc_ed25519_import_private_only(const byte* priv, word32 privSz,
ed25519_key* key)
{
/* sanity check on arguments */
if (priv == NULL || key == NULL)
return BAD_FUNC_ARG;
/* key size check */
if (privSz < ED25519_KEY_SIZE)
return BAD_FUNC_ARG;
XMEMCPY(key->k, priv, ED25519_KEY_SIZE);
return 0;
}
/* Import an ed25519 private and public keys from byte array(s).
*
* priv [in] Array holding private key from wc_ed25519_export_private_only(),
* or private+public keys from wc_ed25519_export_private().
* privSz [in] Number of bytes of data in private key array.
* pub [in] Array holding public key (or NULL).
* pubSz [in] Number of bytes of data in public key array (or 0).
* key [in] Ed25519 private/public key.
* returns BAD_FUNC_ARG when a required parameter is NULL or an invalid
* combination of keys/lengths is supplied, 0 otherwise.
*/
int wc_ed25519_import_private_key(const byte* priv, word32 privSz,
const byte* pub, word32 pubSz, ed25519_key* key)
{
int ret;
/* sanity check on arguments */
if (priv == NULL || key == NULL)
return BAD_FUNC_ARG;
/* key size check */
if (privSz < ED25519_KEY_SIZE)
return BAD_FUNC_ARG;
if (pub == NULL) {
if (pubSz != 0)
return BAD_FUNC_ARG;
if (privSz < ED25519_PRV_KEY_SIZE)
return BAD_FUNC_ARG;
pub = priv + ED25519_KEY_SIZE;
pubSz = ED25519_PUB_KEY_SIZE;
} else if (pubSz < ED25519_PUB_KEY_SIZE) {
return BAD_FUNC_ARG;
}
/* import public key */
ret = wc_ed25519_import_public(pub, pubSz, key);
if (ret != 0)
return ret;
/* make the private key (priv + pub) */
XMEMCPY(key->k, priv, ED25519_KEY_SIZE);
XMEMCPY(key->k + ED25519_KEY_SIZE, key->p, ED25519_PUB_KEY_SIZE);
return ret;
}
#endif /* HAVE_ED25519_KEY_IMPORT */
#ifdef HAVE_ED25519_KEY_EXPORT
/*
export private key only (secret part so 32 bytes)
outLen should contain the size of out buffer when input. outLen is than set
to the final output length.
returns 0 on success
*/
int wc_ed25519_export_private_only(ed25519_key* key, byte* out, word32* outLen)
{
/* sanity checks on arguments */
if (key == NULL || out == NULL || outLen == NULL)
return BAD_FUNC_ARG;
if (*outLen < ED25519_KEY_SIZE) {
*outLen = ED25519_KEY_SIZE;
return BUFFER_E;
}
*outLen = ED25519_KEY_SIZE;
XMEMCPY(out, key->k, ED25519_KEY_SIZE);
return 0;
}
/*
export private key, including public part
outLen should contain the size of out buffer when input. outLen is than set
to the final output length.
returns 0 on success
*/
int wc_ed25519_export_private(ed25519_key* key, byte* out, word32* outLen)
{
/* sanity checks on arguments */
if (key == NULL || out == NULL || outLen == NULL)
return BAD_FUNC_ARG;
if (*outLen < ED25519_PRV_KEY_SIZE) {
*outLen = ED25519_PRV_KEY_SIZE;
return BUFFER_E;
}
*outLen = ED25519_PRV_KEY_SIZE;
XMEMCPY(out, key->k, ED25519_PRV_KEY_SIZE);
return 0;
}
/* export full private key and public key
return 0 on success
*/
int wc_ed25519_export_key(ed25519_key* key,
byte* priv, word32 *privSz,
byte* pub, word32 *pubSz)
{
int ret;
/* export 'full' private part */
ret = wc_ed25519_export_private(key, priv, privSz);
if (ret != 0)
return ret;
/* export public part */
ret = wc_ed25519_export_public(key, pub, pubSz);
return ret;
}
#endif /* HAVE_ED25519_KEY_EXPORT */
/* check the private and public keys match */
int wc_ed25519_check_key(ed25519_key* key)
{
int ret = 0;
unsigned char pubKey[ED25519_PUB_KEY_SIZE];
if (!key->pubKeySet)
ret = PUBLIC_KEY_E;
if (ret == 0)
ret = wc_ed25519_make_public(key, pubKey, sizeof(pubKey));
if (ret == 0 && XMEMCMP(pubKey, key->p, ED25519_PUB_KEY_SIZE) != 0)
ret = PUBLIC_KEY_E;
return ret;
}
/* returns the private key size (secret only) in bytes */
int wc_ed25519_size(ed25519_key* key)
{
if (key == NULL)
return BAD_FUNC_ARG;
return ED25519_KEY_SIZE;
}
/* returns the private key size (secret + public) in bytes */
int wc_ed25519_priv_size(ed25519_key* key)
{
if (key == NULL)
return BAD_FUNC_ARG;
return ED25519_PRV_KEY_SIZE;
}
/* returns the compressed key size in bytes (public key) */
int wc_ed25519_pub_size(ed25519_key* key)
{
if (key == NULL)
return BAD_FUNC_ARG;
return ED25519_PUB_KEY_SIZE;
}
/* returns the size of signature in bytes */
int wc_ed25519_sig_size(ed25519_key* key)
{
if (key == NULL)
return BAD_FUNC_ARG;
return ED25519_SIG_SIZE;
}
#endif /* HAVE_ED25519 */
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