341 lines
9.9 KiB
C
341 lines
9.9 KiB
C
/* signedData-EncryptedFirmwarePkgData.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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* DESCRIPTION:
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*
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* This file includes an example of generating a PKCS7/CMS signedData
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* bundle which encapsulates an encryptedData content type. The encryptedData
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* that is encapsulated has a content type of FirmwarePkgData. It uses the
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* single-shot API to do this.
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*
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* There are two output files generated by this example:
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*
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* signedEncryptedFPD_noattrs.der - without example of optional attributes
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* signedEncryptedFPD_attrs.der - with example of optional attributes
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*/
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#include <wolfssl/options.h>
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#include <wolfssl/wolfcrypt/settings.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-cert.der"
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#define keyFile "../certs/client-key.der"
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#define encodedFileNoAttrs "signedEncryptedFPD_noattrs.der"
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#define encodedFileAttrs "signedEncryptedFPD_attrs.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 byte aes256Key[] = {
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0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
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0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
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0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
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0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08
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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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return -1;
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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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return -1;
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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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static int signedData_sign_noattrs(byte* cert, word32 certSz, byte* privateKey,
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word32 privateKeySz, byte* encryptKey,
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word32 encryptKeySz, byte* out, word32 outSz)
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{
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int ret;
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PKCS7* pkcs7;
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/* init 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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ret = wc_PKCS7_InitWithCert(pkcs7, cert, certSz);
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if (ret != 0) {
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printf("ERROR: wc_PKCS7_InitWithCert() 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 Signed Encrypted FirmwarePkgData */
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ret = wc_PKCS7_EncodeSignedEncryptedFPD(pkcs7, encryptKey, encryptKeySz,
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privateKey, privateKeySz,
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AES256CBCb, RSAk, SHA256h,
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(byte*)data, sizeof(data),
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NULL, 0, NULL, 0,
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out, outSz);
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if (ret <= 0) {
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printf("ERROR: wc_PKCS7_EncodeSignedEncryptedFPD() failed, "
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"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 Signed Encrypted FirmwarePkgData (%s)\n",
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encodedFileNoAttrs);
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#ifdef DEBUG_WOLFSSL
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printf("Encoded DER (%d bytes):\n", ret);
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WOLFSSL_BUFFER(out, ret);
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#endif
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if (write_file_buffer(encodedFileNoAttrs, 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 signedData_sign_attrs(byte* cert, word32 certSz, byte* privateKey,
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word32 privateKeySz, byte* encryptKey,
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word32 encryptKeySz, byte* out, word32 outSz)
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{
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int ret;
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PKCS7* pkcs7;
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static byte messageTypeOid[] =
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{ 0x06, 0x0a, 0x60, 0x86, 0x48, 0x01, 0x86, 0xF8, 0x45, 0x01,
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0x09, 0x02 };
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static byte messageType[] = { 0x13, 2, '1', '9' };
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PKCS7Attrib attribs[] =
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{
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{ messageTypeOid, sizeof(messageTypeOid), messageType,
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sizeof(messageType) }
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};
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/* init 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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ret = wc_PKCS7_InitWithCert(pkcs7, cert, certSz);
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if (ret != 0) {
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printf("ERROR: wc_PKCS7_InitWithCert() 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 Signed Encrypted FirmwarePkgData */
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ret = wc_PKCS7_EncodeSignedEncryptedFPD(pkcs7, encryptKey, encryptKeySz,
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privateKey, privateKeySz,
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AES256CBCb, RSAk, SHA256h,
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(byte*)data, sizeof(data),
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attribs,
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sizeof(attribs)/sizeof(PKCS7Attrib),
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attribs,
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sizeof(attribs)/sizeof(PKCS7Attrib),
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out, outSz);
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if (ret <= 0) {
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printf("ERROR: wc_PKCS7_EncodeSignedEncryptedFPD() failed, "
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"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 Signed Encrypted FirmwarePkgData (%s)\n",
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encodedFileAttrs);
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#ifdef DEBUG_WOLFSSL
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printf("Encoded DER (%d bytes):\n", ret);
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WOLFSSL_BUFFER(out, ret);
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#endif
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if (write_file_buffer(encodedFileAttrs, 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 signedData_verify(byte* in, word32 inSz, byte* cert,
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word32 certSz, byte* key, word32 keySz,
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byte* encryptKey, word32 encryptKeySz,
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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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/* decode signedData, returns size */
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ret = wc_PKCS7_VerifySignedData(pkcs7, in, inSz);
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if (ret < 0) {
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printf("ERROR: Failed to verify SignedData bundle, 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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/* decrypt inner encryptedData */
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pkcs7->encryptionKey = encryptKey;
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pkcs7->encryptionKeySz = encryptKeySz;
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ret = wc_PKCS7_DecodeEncryptedData(pkcs7, pkcs7->content, pkcs7->contentSz,
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out, outSz);
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if (ret < 0) {
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printf("ERROR: failed to decrypt inner EncryptedData, 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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/* compare decrypted to expected */
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if ((ret != sizeof(data)) || XMEMCMP(data, out, ret)) {
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printf("Extracted FirmwarePkgData data does not match expected!\n");
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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 extracted and verified bundle contents\n");
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#ifdef DEBUG_WOLFSSL
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printf("Decoded content (%d bytes):\n", ret);
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WOLFSSL_BUFFER(out, ret);
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#endif
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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[2048];
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byte decrypted[2048];
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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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/* no attributes */
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encryptedSz = signedData_sign_noattrs(cert, certSz, key, keySz,
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aes256Key, sizeof(aes256Key),
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encrypted, sizeof(encrypted));
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if (encryptedSz < 0)
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return -1;
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decryptedSz = signedData_verify(encrypted, encryptedSz,
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cert, certSz, key, keySz,
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aes256Key, sizeof(aes256Key),
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decrypted, sizeof(decrypted));
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if (decryptedSz < 0)
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return -1;
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/* default attributes + messageType attribute */
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encryptedSz = signedData_sign_attrs(cert, certSz, key, keySz,
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aes256Key, sizeof(aes256Key),
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encrypted, sizeof(encrypted));
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if (encryptedSz < 0)
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return -1;
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decryptedSz = signedData_verify(encrypted, encryptedSz,
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cert, certSz, key, keySz,
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aes256Key, sizeof(aes256Key),
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decrypted, sizeof(decrypted));
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if (decryptedSz < 0)
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return -1;
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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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