std::string DecryptAsymmetrical(const std::string& privKey, const std::string& data) {
assert(!data.empty());
string result;
AutoSeededRandomPool rng;
RSA::PrivateKey privateKey;
privateKey.Load(StringSource(privKey, true).Ref());
RSAES_OAEP_SHA_Decryptor d(privateKey);
ui32 blocksCount = *(ui16*)data.data();
const char* ptr = data.data() + 2;
for (size_t i = 0; i < blocksCount; ++i) {
ui16 blockSize = *(ui16*)ptr;
ptr += 2;
string currData = string(ptr, blockSize);
ptr += blockSize;
string currResult;
StringSource ss(currData, true,
new PK_DecryptorFilter(rng, d,
new StringSink(currResult)));
result += currResult;
}
assert(!result.empty());
return result;
}
void LoadKey(const string& filename, RSA::PrivateKey& PrivateKey)
{
// DER Encode Key - PKCS #8 key format
PrivateKey.Load(
FileSource(filename.c_str(), true, NULL, true /*binary*/).Ref()
);
}
void signature_sign(const string & account_num, string & signature){
// Setup
string message = account_num;
RSA::PrivateKey privateKey;
AutoSeededRandomPool rng;
// Load private key
CryptoPP::ByteQueue bytes;
FileSource file("privkey.txt", true, new Base64Decoder);
file.TransferTo(bytes);
bytes.MessageEnd();
privateKey.Load(bytes);
// Sign and Encode
RSASS<PSSR, SHA1>::Signer signer(privateKey);
// StringSource
StringSource(message, true,
new SignerFilter(rng, signer,
new StringSink(signature),
true // putMessage
) // SignerFilter
);
}
void Sign(string str){
// string strContents = "A message to be signed";
string strContents = str;
//FileSource("tobesigned.dat", true, new StringSink(strContents));
AutoSeededRandomPool rng;
//Read private key
CryptoPP::ByteQueue bytes;
FileSource file("privkey.txt", true, new Base64Decoder);
file.TransferTo(bytes);
bytes.MessageEnd();
RSA::PrivateKey privateKey;
privateKey.Load(bytes);
//Sign message
RSASSA_PKCS1v15_SHA_Signer privkey(privateKey);
SecByteBlock sbbSignature(privkey.SignatureLength());
privkey.SignMessage( rng, (byte const*) strContents.data(), strContents.size(), sbbSignature);
//Save result
FileSink sink("message.dat"); //c
sink.Put((byte const*) strContents.data(), strContents.size());
FileSink sinksig("cipher.dat"); //m
sinksig.Put(sbbSignature, sbbSignature.size());
}
void loadRSAPriKey(RSA::PrivateKey& key, const char* filename){
ByteQueue byte;
FileSource file(filename, true, new Base64Decoder);
file.TransferTo(byte);
byte.MessageEnd();
key.Load(byte);
}
std::string Sign(const std::string& privKey, const std::string& message) {
AutoSeededRandomPool rng;
string signature;
RSA::PrivateKey privateKey;
privateKey.Load(StringSource(privKey, true).Ref());
RSASSA_PKCS1v15_SHA_Signer signer(privateKey);
StringSource(message, true,
new SignerFilter(rng, signer,
new StringSink(signature)));
return signature;
}
string SignLicense(AutoSeededRandomPool &rng, string strContents, string pass)
{
//Read private key
string encPrivKey;
StringSink encPrivKeySink(encPrivKey);
FileSource file("secondary-privkey-enc.txt", true, new Base64Decoder);
file.CopyTo(encPrivKeySink);
//Read initialization vector
byte iv[AES::BLOCKSIZE];
CryptoPP::ByteQueue bytesIv;
FileSource file2("secondary-privkey-iv.txt", true, new Base64Decoder);
file2.TransferTo(bytesIv);
bytesIv.MessageEnd();
bytesIv.Get(iv, AES::BLOCKSIZE);
//Hash the pass phrase to create 128 bit key
string hashedPass;
RIPEMD128 hash;
StringSource(pass, true, new HashFilter(hash, new StringSink(hashedPass)));
//Decrypt private key
byte test[encPrivKey.length()];
CFB_Mode<AES>::Decryption cfbDecryption((const unsigned char*)hashedPass.c_str(), hashedPass.length(), iv);
cfbDecryption.ProcessData(test, (byte *)encPrivKey.c_str(), encPrivKey.length());
StringSource privateKeySrc(test, encPrivKey.length(), true, NULL);
//Decode key
RSA::PrivateKey privateKey;
privateKey.Load(privateKeySrc);
//Sign message
RSASSA_PKCS1v15_SHA_Signer privkey(privateKey);
SecByteBlock sbbSignature(privkey.SignatureLength());
privkey.SignMessage(
rng,
(byte const*) strContents.data(),
strContents.size(),
sbbSignature);
//Save result
string out;
Base64Encoder enc(new StringSink(out));
enc.Put(sbbSignature, sbbSignature.size());
enc.MessageEnd();
return out;
}
int main (int argc, const char* argv[]) {
string toSign;
FileSource(argv[1], true, new StringSink(toSign));
AutoSeededRandomPool rng;
//Read private key
CryptoPP::ByteQueue bytes;
FileSource file(argv[2], true, new Base64Decoder);
file.TransferTo(bytes);
bytes.MessageEnd();
RSA::PrivateKey privateKey;
privateKey.Load(bytes);
//Sign message
RSASSA_PKCS1v15_SHA_Signer signer(privateKey);
SecByteBlock signature(signer.SignatureLength());
signer.SignMessage(
rng,
(byte const*) toSign.data(),
toSign.size(),
signature);
//Print string of signature
HexEncoder encoder;
string signatureString;
encoder.Put(signature.data(), signature.size());
encoder.MessageEnd();
word64 signatureSize = encoder.MaxRetrievable();
if (signatureSize) {
signatureString.resize(signatureSize);
encoder.Get((byte*) signatureString.data(), signatureString.size());
}
cout << signatureString << endl;
}
bool
SecTpm::importPrivateKeyPkcs5IntoTpm(const Name& keyName,
const uint8_t* buf, size_t size,
const std::string& passwordStr)
{
using namespace CryptoPP;
Oid pbes2Id;
Oid pbkdf2Id;
SecByteBlock saltBlock;
uint32_t iterationCount;
Oid pbes2encsId;
SecByteBlock ivBlock;
SecByteBlock encryptedDataBlock;
try {
// decode some decoding processes are not necessary for now,
// because we assume only one encryption scheme.
StringSource source(buf, size, true);
// EncryptedPrivateKeyInfo ::= SEQUENCE {
// encryptionAlgorithm EncryptionAlgorithmIdentifier,
// encryptedData OCTET STRING }
BERSequenceDecoder encryptedPrivateKeyInfo(source);
{
// EncryptionAlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER {{PBES2-id}},
// parameters SEQUENCE {{PBES2-params}} }
BERSequenceDecoder encryptionAlgorithm(encryptedPrivateKeyInfo);
{
pbes2Id.decode(encryptionAlgorithm);
// PBES2-params ::= SEQUENCE {
// keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
// encryptionScheme AlgorithmIdentifier {{PBES2-Encs}} }
BERSequenceDecoder pbes2Params(encryptionAlgorithm);
{
// AlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER {{PBKDF2-id}},
// parameters SEQUENCE {{PBKDF2-params}} }
BERSequenceDecoder pbes2KDFs(pbes2Params);
{
pbkdf2Id.decode(pbes2KDFs);
// AlgorithmIdentifier ::= SEQUENCE {
// salt OCTET STRING,
// iterationCount INTEGER (1..MAX),
// keyLength INTEGER (1..MAX) OPTIONAL,
// prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1 }
BERSequenceDecoder pbkdf2Params(pbes2KDFs);
{
BERDecodeOctetString(pbkdf2Params, saltBlock);
BERDecodeUnsigned<uint32_t>(pbkdf2Params, iterationCount, INTEGER);
}
pbkdf2Params.MessageEnd();
}
pbes2KDFs.MessageEnd();
// AlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER {{DES-EDE3-CBC-PAD}},
// parameters OCTET STRING} {{iv}} }
BERSequenceDecoder pbes2Encs(pbes2Params);
{
pbes2encsId.decode(pbes2Encs);
BERDecodeOctetString(pbes2Encs, ivBlock);
}
pbes2Encs.MessageEnd();
}
pbes2Params.MessageEnd();
}
encryptionAlgorithm.MessageEnd();
BERDecodeOctetString(encryptedPrivateKeyInfo, encryptedDataBlock);
}
encryptedPrivateKeyInfo.MessageEnd();
}
catch (const CryptoPP::Exception& e) {
return false;
}
PKCS5_PBKDF2_HMAC<SHA1> keyGenerator;
size_t derivedLen = 24; //For DES-EDE3-CBC-PAD
byte derived[24] = {0};
byte purpose = 0;
try {
keyGenerator.DeriveKey(derived, derivedLen,
purpose,
reinterpret_cast<const byte*>(passwordStr.c_str()), passwordStr.size(),
saltBlock.BytePtr(), saltBlock.size(),
iterationCount);
}
catch (const CryptoPP::Exception& e) {
return false;
}
//decrypt
CBC_Mode< DES_EDE3 >::Decryption d;
d.SetKeyWithIV(derived, derivedLen, ivBlock.BytePtr());
OBufferStream privateKeyOs;
try {
StringSource encryptedSource(encryptedDataBlock.BytePtr(), encryptedDataBlock.size(), true,
new StreamTransformationFilter(d, new FileSink(privateKeyOs)));
}
catch (const CryptoPP::Exception& e) {
return false;
}
if (!importPrivateKeyPkcs8IntoTpm(keyName,
privateKeyOs.buf()->buf(), privateKeyOs.buf()->size()))
return false;
// determine key type
StringSource privateKeySource(privateKeyOs.buf()->buf(), privateKeyOs.buf()->size(), true);
KeyType publicKeyType = KeyType::NONE;
SecByteBlock rawKeyBits;
// PrivateKeyInfo ::= SEQUENCE {
// INTEGER,
// SEQUENCE,
// OCTECT STRING}
BERSequenceDecoder privateKeyInfo(privateKeySource);
{
uint32_t versionNum;
BERDecodeUnsigned<uint32_t>(privateKeyInfo, versionNum, INTEGER);
BERSequenceDecoder sequenceDecoder(privateKeyInfo);
{
Oid keyTypeOid;
keyTypeOid.decode(sequenceDecoder);
if (keyTypeOid == oid::RSA)
publicKeyType = KeyType::RSA;
else if (keyTypeOid == oid::ECDSA)
publicKeyType = KeyType::EC;
else
return false; // Unsupported key type;
}
}
// derive public key
OBufferStream publicKeyOs;
try {
switch (publicKeyType) {
case KeyType::RSA: {
RSA::PrivateKey privateKey;
privateKey.Load(StringStore(privateKeyOs.buf()->buf(), privateKeyOs.buf()->size()).Ref());
RSAFunction publicKey(privateKey);
FileSink publicKeySink(publicKeyOs);
publicKey.DEREncode(publicKeySink);
publicKeySink.MessageEnd();
break;
}
case KeyType::EC: {
ECDSA<ECP, SHA256>::PrivateKey privateKey;
privateKey.Load(StringStore(privateKeyOs.buf()->buf(), privateKeyOs.buf()->size()).Ref());
ECDSA<ECP, SHA256>::PublicKey publicKey;
privateKey.MakePublicKey(publicKey);
publicKey.AccessGroupParameters().SetEncodeAsOID(true);
FileSink publicKeySink(publicKeyOs);
publicKey.DEREncode(publicKeySink);
publicKeySink.MessageEnd();
break;
}
default:
return false;
}
}
catch (const CryptoPP::Exception& e) {
return false;
}
if (!importPublicKeyPkcs1IntoTpm(keyName, publicKeyOs.buf()->buf(), publicKeyOs.buf()->size()))
return false;
return true;
}
Block
SecTpmFile::signInTpm(const uint8_t* data, size_t dataLength,
const Name& keyName, DigestAlgorithm digestAlgorithm)
{
string keyURI = keyName.toUri();
if (!doesKeyExistInTpm(keyName, KeyClass::PRIVATE))
BOOST_THROW_EXCEPTION(Error("private key doesn't exist"));
try {
using namespace CryptoPP;
AutoSeededRandomPool rng;
// Read public key
shared_ptr<v1::PublicKey> pubkeyPtr;
pubkeyPtr = getPublicKeyFromTpm(keyName);
switch (pubkeyPtr->getKeyType()) {
case KeyType::RSA: {
// Read private key
ByteQueue bytes;
FileSource file(m_impl->transformName(keyURI, ".pri").string().c_str(),
true, new Base64Decoder);
file.TransferTo(bytes);
bytes.MessageEnd();
RSA::PrivateKey privateKey;
privateKey.Load(bytes);
// Sign message
switch (digestAlgorithm) {
case DigestAlgorithm::SHA256: {
RSASS<PKCS1v15, SHA256>::Signer signer(privateKey);
OBufferStream os;
StringSource(data, dataLength,
true,
new SignerFilter(rng, signer, new FileSink(os)));
return Block(tlv::SignatureValue, os.buf());
}
default:
BOOST_THROW_EXCEPTION(Error("Unsupported digest algorithm"));
}
}
case KeyType::EC: {
// Read private key
ByteQueue bytes;
FileSource file(m_impl->transformName(keyURI, ".pri").string().c_str(),
true, new Base64Decoder);
file.TransferTo(bytes);
bytes.MessageEnd();
// Sign message
switch (digestAlgorithm) {
case DigestAlgorithm::SHA256: {
ECDSA<ECP, SHA256>::PrivateKey privateKey;
privateKey.Load(bytes);
ECDSA<ECP, SHA256>::Signer signer(privateKey);
OBufferStream os;
StringSource(data, dataLength,
true,
new SignerFilter(rng, signer, new FileSink(os)));
uint8_t buf[200];
size_t bufSize = DSAConvertSignatureFormat(buf, sizeof(buf), DSA_DER,
os.buf()->buf(), os.buf()->size(),
DSA_P1363);
shared_ptr<Buffer> sigBuffer = make_shared<Buffer>(buf, bufSize);
return Block(tlv::SignatureValue, sigBuffer);
}
default:
BOOST_THROW_EXCEPTION(Error("Unsupported digest algorithm"));
}
}
default:
BOOST_THROW_EXCEPTION(Error("Unsupported key type"));
}
}
catch (const CryptoPP::Exception& e) {
BOOST_THROW_EXCEPTION(Error(e.what()));
}
}
