302 lines
8.2 KiB
C
302 lines
8.2 KiB
C
/* authEnvelopedData-ori.c
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <wolfssl/options.h>
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#include <wolfssl/wolfcrypt/pkcs7.h>
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#include <wolfssl/wolfcrypt/error-crypt.h>
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#include <wolfssl/wolfcrypt/logging.h>
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#define certFile "../certs/client-ecc-cert.der"
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#define keyFile "../certs/ecc-client-key.der"
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#define encodedFileORI "authEnvelopedDataORI.der"
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static const byte data[] = { /* Hello World */
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0x48,0x65,0x6c,0x6c,0x6f,0x20,0x57,0x6f,
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0x72,0x6c,0x64
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};
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static const byte asnDataOid[] = {
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0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x01
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};
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static int load_certs(byte* cert, word32* certSz, byte* key, word32* keySz)
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{
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FILE* file;
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/* certificate file */
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file = fopen(certFile, "rb");
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if (!file) {
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printf("ERROR: failed to open file: %s\n", certFile);
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return -1;
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}
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*certSz = (word32)fread(cert, 1, *certSz, file);
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fclose(file);
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/* key file */
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file = fopen(keyFile, "rb");
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if (!file) {
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printf("ERROR: failed to open file: %s\n", keyFile);
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return -1;
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}
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*keySz = (word32)fread(key, 1, *keySz, file);
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fclose(file);
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return 0;
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}
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static int write_file_buffer(const char* fileName, byte* in, word32 inSz)
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{
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int ret;
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FILE* file;
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file = fopen(fileName, "wb");
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if (file == NULL) {
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printf("ERROR: opening file for writing: %s\n", fileName);
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return -1;
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}
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ret = (int)fwrite(in, 1, inSz, file);
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if (ret == 0) {
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printf("ERROR: writing buffer to output file\n");
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return -1;
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}
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fclose(file);
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return 0;
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}
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/* ORI encrypt callback, responsible for encrypting content-encryption key (CEK)
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* and giving wolfCrypt the value for oriOID and oriValue to place in
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* OtherRecipientInfo.
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*
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* Returns 0 on success, negative upon error. */
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static int myOriEncryptCb(PKCS7* pkcs7, byte* cek, word32 cekSz, byte* oriType,
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word32* oriTypeSz, byte* oriValue, word32* oriValueSz,
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void* ctx)
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{
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int i;
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/* make sure buffers are large enough */
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if ((*oriValueSz < (2 + cekSz)) || (*oriTypeSz < sizeof(oriType)))
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return -1;
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/* our simple encryption algorithm will be take the bitwise complement */
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oriValue[0] = 0x04; /*ASN OCTET STRING */
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oriValue[1] = (byte)cekSz; /* length */
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for (i = 0; i < (int)cekSz; i++) {
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oriValue[2 + i] = ~cek[i];
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}
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*oriValueSz = 2 + cekSz;
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/* set oriType to ASN.1 encoded data OID */
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XMEMCPY(oriType, asnDataOid, sizeof(asnDataOid));
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*oriTypeSz = sizeof(asnDataOid);
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(void)pkcs7;
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(void)ctx;
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return 0;
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}
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/* ORI decrypt callback, responsible for providing a decrypted content
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* encryption key (CEK) placed into decryptedKey and size placed into
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* decryptedKeySz. oriOID and oriValue are given to the callback to help
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* in decrypting the encrypted CEK.
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*
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* Returns 0 on success, negative upon error. */
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static int myOriDecryptCb(PKCS7* pkcs7, byte* oriType, word32 oriTypeSz,
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byte* oriValue, word32 oriValueSz, byte* decryptedKey,
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word32* decryptedKeySz, void* ctx)
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{
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int i;
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/* make sure oriType matches what we expect */
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if (oriTypeSz != sizeof(asnDataOid))
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return -1;
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if (XMEMCMP(oriType, asnDataOid, sizeof(asnDataOid)) != 0)
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return -1;
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/* make sure decrypted buffer is large enough */
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if (*decryptedKeySz < oriValueSz)
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return -1;
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/* decrypt encrypted CEK using simple bitwise complement,
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only for example */
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for (i = 0; i < (int)oriValueSz - 2; i++) {
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decryptedKey[i] = ~oriValue[2 + i];
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}
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*decryptedKeySz = oriValueSz - 2;
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(void)pkcs7;
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(void)ctx;
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return 0;
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}
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static int authEnvelopedData_encrypt(byte* cert, word32 certSz, byte* key,
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word32 keySz, byte* out, word32 outSz)
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{
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int ret;
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PKCS7* pkcs7;
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pkcs7 = wc_PKCS7_New(NULL, INVALID_DEVID);
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if (pkcs7 == NULL)
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return -1;
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pkcs7->content = (byte*)data;
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pkcs7->contentSz = sizeof(data);
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pkcs7->contentOID = DATA;
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pkcs7->encryptOID = AES256GCMb;
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/* add recipient using otherRecipientInfo (ORI) with custom encrypt
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* callback to handle encryption. ORI is loosely defined, allowing
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* advanced users or future protocols to extend the CMS RecipientInfo
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* model. */
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ret = wc_PKCS7_AddRecipient_ORI(pkcs7, myOriEncryptCb, 0);
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if (ret < 0) {
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printf("wc_PKCS7_AddRecipient_ORI() failed, ret = %d\n", ret);
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wc_PKCS7_Free(pkcs7);
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return -1;
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}
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/* encode authEnvelopedData, returns size */
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ret = wc_PKCS7_EncodeAuthEnvelopedData(pkcs7, out, outSz);
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if (ret <= 0) {
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printf("wc_PKCS7_EncodeAuthEnvelopedData() failed, ret = %d\n", ret);
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wc_PKCS7_Free(pkcs7);
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return -1;
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} else {
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printf("Successfully encoded AuthEnvelopedData bundle (%s)\n",
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encodedFileORI);
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if (write_file_buffer(encodedFileORI, out, ret) != 0) {
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printf("ERROR: error writing encoded to output file\n");
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return -1;
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}
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}
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wc_PKCS7_Free(pkcs7);
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return ret;
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}
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static int authEnvelopedData_decrypt(byte* in, word32 inSz, byte* cert,
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word32 certSz, byte* key, word32 keySz,
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byte* out, word32 outSz)
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{
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int ret;
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PKCS7* pkcs7;
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pkcs7 = wc_PKCS7_New(NULL, INVALID_DEVID);
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if (pkcs7 == NULL)
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return -1;
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/* set decrypt callback for decryption */
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ret = wc_PKCS7_SetOriDecryptCb(pkcs7, myOriDecryptCb);
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if (ret != 0) {
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printf("ERROR: wc_PKCS7_SetOriDecryptCb(), ret = %d\n", ret);
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wc_PKCS7_Free(pkcs7);
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return -1;
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}
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/* decode authEnvelopedData, returns size */
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ret = wc_PKCS7_DecodeAuthEnvelopedData(pkcs7, in, inSz, out, outSz);
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if (ret <= 0 || (ret != sizeof(data)) || (XMEMCMP(out, data, ret) != 0)) {
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printf("ERROR: wc_PKCS7_DecodeAuthEnvelopedData(), ret = %d\n", ret);
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wc_PKCS7_Free(pkcs7);
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return -1;
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} else {
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printf("Successfully decoded AuthEnvelopedData bundle (%s)\n",
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encodedFileORI);
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}
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wc_PKCS7_Free(pkcs7);
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return ret;
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}
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#ifdef HAVE_PKCS7
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int main(int argc, char** argv)
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{
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int ret;
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int encryptedSz, decryptedSz;
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word32 certSz, keySz;
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byte cert[2048];
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byte key[2048];
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byte encrypted[1024];
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byte decrypted[1024];
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#ifdef DEBUG_WOLFSSL
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wolfSSL_Debugging_ON();
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#endif
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certSz = sizeof(cert);
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keySz = sizeof(key);
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ret = load_certs(cert, &certSz, key, &keySz);
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if (ret != 0)
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return -1;
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encryptedSz = authEnvelopedData_encrypt(cert, certSz, key, keySz,
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encrypted, sizeof(encrypted));
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if (encryptedSz < 0)
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return -1;
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#ifdef DEBUG_WOLFSSL
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printf("AuthEnvelopedData DER (%d byte):\n", encryptedSz);
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WOLFSSL_BUFFER(encrypted, encryptedSz);
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#endif
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decryptedSz = authEnvelopedData_decrypt(encrypted, encryptedSz,
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cert, certSz, key, keySz,
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decrypted, sizeof(decrypted));
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if (decryptedSz < 0)
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return -1;
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#ifdef DEBUG_WOLFSSL
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printf("Decrypted content (%d byte):\n", decryptedSz);
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WOLFSSL_BUFFER(decrypted, decryptedSz);
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#endif
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(void)argc;
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(void)argv;
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return 0;
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}
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#else
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int main(int argc, char** argv)
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{
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printf("Must build wolfSSL using ./configure --enable-pkcs7\n");
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return 0;
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}
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#endif
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