Block
SecTpmMemory::signInTpm(const uint8_t *data, size_t dataLength,
const Name& keyName,
DigestAlgorithm digestAlgorithm)
{
if (digestAlgorithm != DIGEST_ALGORITHM_SHA256)
return ConstBufferPtr();
// Find the private key and sign.
PrivateKeyStore::iterator privateKey = privateKeyStore_.find(keyName.toUri());
if (privateKey == privateKeyStore_.end())
throw Error(string("MemoryPrivateKeyStorage: Cannot find private key ") + keyName.toUri());
uint8_t digest[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
SHA256_Init(&sha256);
SHA256_Update(&sha256, data, dataLength);
SHA256_Final(digest, &sha256);
BufferPtr signatureBuffer = ptr_lib::make_shared<Buffer>();
signatureBuffer->resize(RSA_size(privateKey->second->getPrivateKey()));
unsigned int signatureBitsLength;
if (!RSA_sign(NID_sha256, digest, sizeof(digest),
signatureBuffer->buf(),
&signatureBitsLength,
privateKey->second->getPrivateKey()))
{
throw Error("Error in RSA_sign");
}
return Block(Tlv::SignatureValue, signatureBuffer);
}
BufferPtr
serializeMsg(const Msg& msg)
{
int size = msg.ByteSize();
BufferPtr bytes = std::make_shared<Buffer>(size);
msg.SerializeToArray(bytes->buf(), size);
return bytes;
}