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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#include "common.hpp"
#include "sec-tpm-memory.hpp"
#include "public-key.hpp"
#include <openssl/ssl.h>
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include <cryptopp/osrng.h>
using namespace std;
namespace ndn {
/**
* RsaPrivateKey is a simple class to hold an RSA private key.
*/
class SecTpmMemory::RsaPrivateKey {
public:
RsaPrivateKey(const uint8_t *keyDer, size_t keyDerLength)
{
// Use a temporary pointer since d2i updates it.
const uint8_t *derPointer = keyDer;
privateKey_ = d2i_RSAPrivateKey(NULL, &derPointer, keyDerLength);
if (!privateKey_)
throw Error("RsaPrivateKey constructor: Error decoding private key DER");
}
~RsaPrivateKey()
{
if (privateKey_)
RSA_free(privateKey_);
}
rsa_st *
getPrivateKey()
{
return privateKey_;
}
private:
rsa_st * privateKey_;
};
SecTpmMemory::~SecTpmMemory()
{
}
void
SecTpmMemory::setKeyPairForKeyName(const Name& keyName,
uint8_t *publicKeyDer, size_t publicKeyDerLength,
uint8_t *privateKeyDer, size_t privateKeyDerLength)
{
publicKeyStore_[keyName.toUri()] = ptr_lib::make_shared<PublicKey>(publicKeyDer, publicKeyDerLength);
privateKeyStore_[keyName.toUri()] = ptr_lib::make_shared<RsaPrivateKey>(privateKeyDer, privateKeyDerLength);
}
void
SecTpmMemory::generateKeyPairInTpm(const Name& keyName, KeyType keyType, int keySize)
{
#if 1
throw Error("SecTpmMemory::generateKeyPair not implemented");
#endif
}
void
SecTpmMemory::deleteKeyPairInTpm(const Name &keyName)
{
throw Error("SecTpmMemory::deleteKeyPairInTpm not implemented");
}
ptr_lib::shared_ptr<PublicKey>
SecTpmMemory::getPublicKeyFromTpm(const Name& keyName)
{
PublicKeyStore::iterator publicKey = publicKeyStore_.find(keyName.toUri());
if (publicKey == publicKeyStore_.end())
throw Error(string("MemoryPrivateKeyStorage: Cannot find public key ") + keyName.toUri());
return publicKey->second;
}
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);
}
ConstBufferPtr
SecTpmMemory::decryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric)
{
#if 1
throw Error("MemoryPrivateKeyStorage::decrypt not implemented");
#endif
}
ConstBufferPtr
SecTpmMemory::encryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric)
{
#if 1
throw Error("MemoryPrivateKeyStorage::encrypt not implemented");
#endif
}
void
SecTpmMemory::generateSymmetricKeyInTpm(const Name& keyName, KeyType keyType, int keySize)
{
#if 1
throw Error("MemoryPrivateKeyStorage::generateKey not implemented");
#endif
}
bool
SecTpmMemory::doesKeyExistInTpm(const Name& keyName, KeyClass keyClass)
{
if (keyClass == KEY_CLASS_PUBLIC)
return publicKeyStore_.find(keyName.toUri()) != publicKeyStore_.end();
else if (keyClass == KEY_CLASS_PRIVATE)
return privateKeyStore_.find(keyName.toUri()) != privateKeyStore_.end();
else
// KEY_CLASS_SYMMETRIC not implemented yet.
return false;
}
bool
SecTpmMemory::generateRandomBlock(uint8_t* res, size_t size)
{
try{
CryptoPP::AutoSeededRandomPool rng;
rng.GenerateBlock(res, size);
return true;
}catch(const CryptoPP::Exception& e){
return false;
}
}
}