static CURLcode Curl_cyassl_random(struct Curl_easy *data,
unsigned char *entropy, size_t length)
{
RNG rng;
(void)data;
if(InitRng(&rng))
return CURLE_FAILED_INIT;
if(length > UINT_MAX)
return CURLE_FAILED_INIT;
if(RNG_GenerateBlock(&rng, entropy, (unsigned)length))
return CURLE_FAILED_INIT;
if(FreeRng(&rng))
return CURLE_FAILED_INIT;
return CURLE_OK;
}
/* build PKCS#7 envelopedData content type, return enveloped size */
int PKCS7_EncodeEnvelopedData(PKCS7* pkcs7, byte* output, word32 outputSz)
{
int i, ret = 0, idx = 0;
int totalSz = 0, padSz = 0, desOutSz = 0;
int contentInfoSeqSz, outerContentTypeSz, outerContentSz;
byte contentInfoSeq[MAX_SEQ_SZ];
byte outerContentType[MAX_ALGO_SZ];
byte outerContent[MAX_SEQ_SZ];
int envDataSeqSz, verSz;
byte envDataSeq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
RNG rng;
int contentKeyEncSz, blockKeySz;
int dynamicFlag = 0;
byte contentKeyPlain[MAX_CONTENT_KEY_LEN];
byte contentKeyEnc[MAX_ENCRYPTED_KEY_SZ];
byte* plain;
byte* encryptedContent;
int recipSz, recipSetSz;
byte recip[MAX_RECIP_SZ];
byte recipSet[MAX_SET_SZ];
int encContentOctetSz, encContentSeqSz, contentTypeSz;
int contentEncAlgoSz, ivOctetStringSz;
byte encContentSeq[MAX_SEQ_SZ];
byte contentType[MAX_ALGO_SZ];
byte contentEncAlgo[MAX_ALGO_SZ];
byte tmpIv[DES_BLOCK_SIZE];
byte ivOctetString[MAX_OCTET_STR_SZ];
byte encContentOctet[MAX_OCTET_STR_SZ];
if (pkcs7 == NULL || pkcs7->content == NULL || pkcs7->contentSz == 0 ||
pkcs7->encryptOID == 0 || pkcs7->singleCert == NULL)
return BAD_FUNC_ARG;
if (output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
/* PKCS#7 only supports DES, 3DES for now */
switch (pkcs7->encryptOID) {
case DESb:
blockKeySz = DES_KEYLEN;
break;
case DES3b:
blockKeySz = DES3_KEYLEN;
break;
default:
CYASSL_MSG("Unsupported content cipher type");
return ALGO_ID_E;
};
/* outer content type */
outerContentTypeSz = SetContentType(ENVELOPED_DATA, outerContentType);
/* version, defined as 0 in RFC 2315 */
verSz = SetMyVersion(0, ver, 0);
/* generate random content encryption key */
ret = InitRng(&rng);
if (ret != 0)
return ret;
ret = RNG_GenerateBlock(&rng, contentKeyPlain, blockKeySz);
if (ret != 0)
return ret;
/* build RecipientInfo, only handle 1 for now */
recipSz = CreateRecipientInfo(pkcs7->singleCert, pkcs7->singleCertSz, RSAk,
blockKeySz, &rng, contentKeyPlain,
contentKeyEnc, &contentKeyEncSz, recip,
MAX_RECIP_SZ);
if (recipSz < 0) {
CYASSL_MSG("Failed to create RecipientInfo");
return recipSz;
}
recipSetSz = SetSet(recipSz, recipSet);
/* generate IV for block cipher */
ret = RNG_GenerateBlock(&rng, tmpIv, DES_BLOCK_SIZE);
if (ret != 0)
return ret;
/* EncryptedContentInfo */
contentTypeSz = SetContentType(pkcs7->contentOID, contentType);
if (contentTypeSz == 0)
return BAD_FUNC_ARG;
/* allocate encrypted content buffer, pad if necessary, PKCS#7 padding */
padSz = DES_BLOCK_SIZE - (pkcs7->contentSz % DES_BLOCK_SIZE);
desOutSz = pkcs7->contentSz + padSz;
if (padSz != 0) {
plain = XMALLOC(desOutSz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (plain == NULL) {
return MEMORY_E;
}
XMEMCPY(plain, pkcs7->content, pkcs7->contentSz);
dynamicFlag = 1;
for (i = 0; i < padSz; i++) {
plain[pkcs7->contentSz + i] = padSz;
}
} else {
plain = pkcs7->content;
desOutSz = pkcs7->contentSz;
}
encryptedContent = XMALLOC(desOutSz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (encryptedContent == NULL) {
if (dynamicFlag)
XFREE(plain, NULL, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
/* put together IV OCTET STRING */
ivOctetStringSz = SetOctetString(DES_BLOCK_SIZE, ivOctetString);
/* build up our ContentEncryptionAlgorithmIdentifier sequence,
* adding (ivOctetStringSz + DES_BLOCK_SIZE) for IV OCTET STRING */
contentEncAlgoSz = SetAlgoID(pkcs7->encryptOID, contentEncAlgo,
blkType, ivOctetStringSz + DES_BLOCK_SIZE);
if (contentEncAlgoSz == 0)
return BAD_FUNC_ARG;
/* encrypt content */
if (pkcs7->encryptOID == DESb) {
Des des;
ret = Des_SetKey(&des, contentKeyPlain, tmpIv, DES_ENCRYPTION);
if (ret == 0)
Des_CbcEncrypt(&des, encryptedContent, plain, desOutSz);
if (ret != 0) {
XFREE(encryptedContent, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (dynamicFlag)
XFREE(plain, NULL, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
}
else if (pkcs7->encryptOID == DES3b) {
Des3 des3;
ret = Des3_SetKey(&des3, contentKeyPlain, tmpIv, DES_ENCRYPTION);
if (ret == 0)
ret = Des3_CbcEncrypt(&des3, encryptedContent, plain, desOutSz);
if (ret != 0) {
XFREE(encryptedContent, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (dynamicFlag)
XFREE(plain, NULL, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
}
encContentOctetSz = SetImplicit(ASN_OCTET_STRING, 0,
desOutSz, encContentOctet);
encContentSeqSz = SetSequence(contentTypeSz + contentEncAlgoSz +
ivOctetStringSz + DES_BLOCK_SIZE +
encContentOctetSz + desOutSz, encContentSeq);
/* keep track of sizes for outer wrapper layering */
totalSz = verSz + recipSetSz + recipSz + encContentSeqSz + contentTypeSz +
contentEncAlgoSz + ivOctetStringSz + DES_BLOCK_SIZE +
encContentOctetSz + desOutSz;
/* EnvelopedData */
envDataSeqSz = SetSequence(totalSz, envDataSeq);
totalSz += envDataSeqSz;
/* outer content */
outerContentSz = SetExplicit(0, totalSz, outerContent);
totalSz += outerContentTypeSz;
totalSz += outerContentSz;
/* ContentInfo */
contentInfoSeqSz = SetSequence(totalSz, contentInfoSeq);
totalSz += contentInfoSeqSz;
if (totalSz > (int)outputSz) {
CYASSL_MSG("Pkcs7_encrypt output buffer too small");
XFREE(encryptedContent, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (dynamicFlag)
XFREE(plain, NULL, DYNAMIC_TYPE_TMP_BUFFER);
return BUFFER_E;
}
XMEMCPY(output + idx, contentInfoSeq, contentInfoSeqSz);
idx += contentInfoSeqSz;
XMEMCPY(output + idx, outerContentType, outerContentTypeSz);
idx += outerContentTypeSz;
XMEMCPY(output + idx, outerContent, outerContentSz);
idx += outerContentSz;
XMEMCPY(output + idx, envDataSeq, envDataSeqSz);
idx += envDataSeqSz;
XMEMCPY(output + idx, ver, verSz);
idx += verSz;
XMEMCPY(output + idx, recipSet, recipSetSz);
idx += recipSetSz;
XMEMCPY(output + idx, recip, recipSz);
idx += recipSz;
XMEMCPY(output + idx, encContentSeq, encContentSeqSz);
idx += encContentSeqSz;
XMEMCPY(output + idx, contentType, contentTypeSz);
idx += contentTypeSz;
XMEMCPY(output + idx, contentEncAlgo, contentEncAlgoSz);
idx += contentEncAlgoSz;
XMEMCPY(output + idx, ivOctetString, ivOctetStringSz);
idx += ivOctetStringSz;
XMEMCPY(output + idx, tmpIv, DES_BLOCK_SIZE);
idx += DES_BLOCK_SIZE;
XMEMCPY(output + idx, encContentOctet, encContentOctetSz);
idx += encContentOctetSz;
XMEMCPY(output + idx, encryptedContent, desOutSz);
idx += desOutSz;
#ifdef NO_RC4
FreeRng(&rng);
#endif
XMEMSET(contentKeyPlain, 0, MAX_CONTENT_KEY_LEN);
XMEMSET(contentKeyEnc, 0, MAX_ENCRYPTED_KEY_SZ);
if (dynamicFlag)
XFREE(plain, NULL, DYNAMMIC_TYPE_TMP_BUFFER);
XFREE(encryptedContent, NULL, DYNAMIC_TYPE_TMP_BUFFER);
return idx;
}
