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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2014 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
*/
#include "sec-tpm.hpp"
#include "../encoding/oid.hpp"
#include "../encoding/buffer-stream.hpp"
#include "cryptopp.hpp"
namespace ndn {
using std::string;
SecTpm::SecTpm(const string& location)
: m_location(location)
{
}
SecTpm::~SecTpm()
{
}
std::string
SecTpm::getTpmLocator()
{
return this->getScheme() + ":" + m_location;
}
ConstBufferPtr
SecTpm::exportPrivateKeyPkcs5FromTpm(const Name& keyName, const string& passwordStr)
{
using namespace CryptoPP;
uint8_t salt[8] = {0};
uint8_t iv[8] = {0};
// derive key
if (!generateRandomBlock(salt, 8) || !generateRandomBlock(iv, 8))
throw Error("Cannot generate salt or iv");
uint32_t iterationCount = 2048;
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(),
salt, 8, iterationCount);
}
catch (CryptoPP::Exception& e)
{
throw Error("Cannot derived the encryption key");
}
//encrypt
CBC_Mode< DES_EDE3 >::Encryption e;
e.SetKeyWithIV(derived, derivedLen, iv);
ConstBufferPtr pkcs8PrivateKey = exportPrivateKeyPkcs8FromTpm(keyName);
if (!static_cast<bool>(pkcs8PrivateKey))
throw Error("Cannot export the private key, #1");
OBufferStream encryptedOs;
try
{
StringSource stringSource(pkcs8PrivateKey->buf(), pkcs8PrivateKey->size(), true,
new StreamTransformationFilter(e, new FileSink(encryptedOs)));
}
catch (CryptoPP::Exception& e)
{
throw Error("Cannot export the private key, #2");
}
//encode
OID pbes2Id("1.2.840.113549.1.5.13");
OID pbkdf2Id("1.2.840.113549.1.5.12");
OID pbes2encsId("1.2.840.113549.3.7");
OBufferStream pkcs8Os;
try
{
FileSink sink(pkcs8Os);
// EncryptedPrivateKeyInfo ::= SEQUENCE {
// encryptionAlgorithm EncryptionAlgorithmIdentifier,
// encryptedData OCTET STRING }
DERSequenceEncoder encryptedPrivateKeyInfo(sink);
{
// EncryptionAlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER {{PBES2-id}},
// parameters SEQUENCE {{PBES2-params}} }
DERSequenceEncoder encryptionAlgorithm(encryptedPrivateKeyInfo);
{
pbes2Id.encode(encryptionAlgorithm);
// PBES2-params ::= SEQUENCE {
// keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
// encryptionScheme AlgorithmIdentifier {{PBES2-Encs}} }
DERSequenceEncoder pbes2Params(encryptionAlgorithm);
{
// AlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER {{PBKDF2-id}},
// parameters SEQUENCE {{PBKDF2-params}} }
DERSequenceEncoder pbes2KDFs(pbes2Params);
{
pbkdf2Id.encode(pbes2KDFs);
// AlgorithmIdentifier ::= SEQUENCE {
// salt OCTET STRING,
// iterationCount INTEGER (1..MAX),
// keyLength INTEGER (1..MAX) OPTIONAL,
// prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1 }
DERSequenceEncoder pbkdf2Params(pbes2KDFs);
{
DEREncodeOctetString(pbkdf2Params, salt, 8);
DEREncodeUnsigned<uint32_t>(pbkdf2Params, iterationCount, INTEGER);
}
pbkdf2Params.MessageEnd();
}
pbes2KDFs.MessageEnd();
// AlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER {{DES-EDE3-CBC-PAD}},
// parameters OCTET STRING} {{iv}} }
DERSequenceEncoder pbes2Encs(pbes2Params);
{
pbes2encsId.encode(pbes2Encs);
DEREncodeOctetString(pbes2Encs, iv, 8);
}
pbes2Encs.MessageEnd();
}
pbes2Params.MessageEnd();
}
encryptionAlgorithm.MessageEnd();
DEREncodeOctetString(encryptedPrivateKeyInfo,
encryptedOs.buf()->buf(), encryptedOs.buf()->size());
}
encryptedPrivateKeyInfo.MessageEnd();
return pkcs8Os.buf();
}
catch (CryptoPP::Exception& e)
{
throw Error("Cannot export the private key, #3");
}
}
bool
SecTpm::importPrivateKeyPkcs5IntoTpm(const Name& keyName,
const uint8_t* buf, size_t size,
const 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 (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 (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 (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 = KEY_TYPE_NULL;
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 = KEY_TYPE_RSA;
else if (keyTypeOID == oid::ECDSA)
publicKeyType = KEY_TYPE_ECDSA;
else
return false; // Unsupported key type;
}
}
//derive public key
OBufferStream publicKeyOs;
try {
switch (publicKeyType) {
case KEY_TYPE_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 KEY_TYPE_ECDSA:
{
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 (CryptoPP::Exception& e) {
return false;
}
if (!importPublicKeyPkcs1IntoTpm(keyName, publicKeyOs.buf()->buf(), publicKeyOs.buf()->size()))
return false;
return true;
}
bool
SecTpm::getImpExpPassWord(std::string& password, const std::string& prompt)
{
bool isInitialized = false;
char* pw0 = 0;
pw0 = getpass(prompt.c_str());
if (0 == pw0)
return false;
std::string password1 = pw0;
memset(pw0, 0, strlen(pw0));
pw0 = getpass("Confirm:");
if (0 == pw0)
{
std::fill(password1.begin(), password1.end(), 0);
return false;
}
if (0 == password1.compare(pw0))
{
isInitialized = true;
password.swap(password1);
}
std::fill(password1.begin(), password1.end(), 0);
memset(pw0, 0, strlen(pw0));
if (password.empty())
return false;
return isInitialized;
}
} // namespace ndn