CFDataRef SecDigestCreate(CFAllocatorRef allocator,
const SecAsn1Oid *algorithm, const SecAsn1Item *params,
const UInt8 *data, CFIndex length) {
unsigned char *(*digestFcn)(const void *data, CC_LONG len, unsigned char *md);
CFIndex digestLen;
if (length > INT32_MAX)
return NULL;
if (SecAsn1OidCompare(algorithm, &CSSMOID_SHA1)) {
digestFcn = CC_SHA1;
digestLen = CC_SHA1_DIGEST_LENGTH;
} else if (SecAsn1OidCompare(algorithm, &CSSMOID_SHA224)) {
digestFcn = CC_SHA224;
digestLen = CC_SHA224_DIGEST_LENGTH;
} else if (SecAsn1OidCompare(algorithm, &CSSMOID_SHA256)) {
digestFcn = CC_SHA256;
digestLen = CC_SHA256_DIGEST_LENGTH;
} else if (SecAsn1OidCompare(algorithm, &CSSMOID_SHA384)) {
digestFcn = CC_SHA384;
digestLen = CC_SHA384_DIGEST_LENGTH;
} else if (SecAsn1OidCompare(algorithm, &CSSMOID_SHA512)) {
digestFcn = CC_SHA512;
digestLen = CC_SHA512_DIGEST_LENGTH;
} else {
return NULL;
}
CFMutableDataRef digest = CFDataCreateMutable(allocator, digestLen);
CFDataSetLength(digest, digestLen);
digestFcn(data, (CC_LONG)length, CFDataGetMutableBytePtr(digest));
return digest;
}
SecKeyRef SecKeyCreatePublicFromDER(CFAllocatorRef allocator,
const SecAsn1Oid *oid, const SecAsn1Item *params,
const SecAsn1Item *keyData) {
SecKeyRef publicKey = NULL;
if (SecAsn1OidCompare(oid, &CSSMOID_RSA)) {
/* pkcs1 1 */
publicKey = SecKeyCreateRSAPublicKey(kCFAllocatorDefault,
keyData->Data, keyData->Length, kSecKeyEncodingPkcs1);
} else if (SecAsn1OidCompare(oid, &CSSMOID_ecPublicKey)) {
SecDERKey derKey = {
.oid = oid->Data,
.oidLength = oid->Length,
.key = keyData->Data,
.keyLength = keyData->Length,
};
if (params) {
derKey.parameters = params->Data;
derKey.parametersLength = params->Length;
}
publicKey = SecKeyCreateECPublicKey(kCFAllocatorDefault,
(const uint8_t *)&derKey, sizeof(derKey), kSecDERKeyEncoding);
} else {
