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/*
* Copyright (c) 2010 .SE (The Internet Infrastructure Foundation)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
BotanAES.cpp
Botan AES implementation
*****************************************************************************/
#include "config.h"
#include "BotanAES.h"
#include <algorithm>
#include <botan/rfc3394.h>
#include <botan/version.h>
#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,11,14)
#include <botan/libstate.h>
#endif
// Wrap/Unwrap keys
bool BotanAES::wrapKey(const SymmetricKey* key, const SymWrap::Type mode, const ByteString& in, ByteString& out)
{
// Check key bit length; AES only supports 128, 192 or 256 bit keys
if ((key->getBitLen() != 128) &&
(key->getBitLen() != 192) &&
(key->getBitLen() != 256))
{
ERROR_MSG("Invalid AES key length (%d bits)", key->getBitLen());
return false;
}
// Determine the wrapping mode
if (mode == SymWrap::AES_KEYWRAP)
{
// RFC 3394 AES key wrap
if (in.size() < 16)
{
ERROR_MSG("key data to wrap too small");
return false;
}
if ((in.size() % 8) != 0)
{
ERROR_MSG("key data to wrap not aligned");
return false;
}
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
Botan::secure_vector<Botan::byte> data(in.size());
memcpy(data.data(), in.const_byte_str(), in.size());
Botan::secure_vector<Botan::byte> wrapped;
#else
Botan::MemoryVector<Botan::byte> data(in.size());
memcpy(data.begin(), in.const_byte_str(), in.size());
Botan::SecureVector<Botan::byte> wrapped;
#endif
Botan::SymmetricKey botanKey = Botan::SymmetricKey(key->getKeyBits().const_byte_str(), key->getKeyBits().size());
#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,11,14)
Botan::Algorithm_Factory& af = Botan::global_state().algorithm_factory();
try
{
wrapped = Botan::rfc3394_keywrap(data, botanKey, af);
}
#else
try
{
wrapped = Botan::rfc3394_keywrap(data, botanKey);
}
#endif
catch (...)
{
ERROR_MSG("AES key wrap failed");
return false;
}
out.resize(wrapped.size());
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
memcpy(&out[0], wrapped.data(), out.size());
#else
memcpy(&out[0], wrapped.begin(), out.size());
#endif
return true;
}
#ifdef HAVE_AES_KEY_WRAP_PAD
else if (mode == SymWrap::AES_KEYWRAP_PAD)
{
// RFC 5649 AES key wrap with pad
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
Botan::secure_vector<Botan::byte> data(in.size());
memcpy(data.data(), in.const_byte_str(), in.size());
Botan::secure_vector<Botan::byte> wrapped;
#else
Botan::MemoryVector<Botan::byte> data(in.size());
memcpy(data.begin(), in.const_byte_str(), in.size());
Botan::SecureVector<Botan::byte> wrapped;
#endif
Botan::SymmetricKey botanKey = Botan::SymmetricKey(key->getKeyBits().const_byte_str(), key->getKeyBits().size());
#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,11,14)
Botan::Algorithm_Factory& af = Botan::global_state().algorithm_factory();
try
{
wrapped = Botan::rfc5649_keywrap(data, botanKey, af);
}
#else
try
{
wrapped = Botan::rfc5649_keywrap(data, botanKey);
}
#endif
catch (...)
{
ERROR_MSG("AES key wrap failed");
return false;
}
out.resize(wrapped.size());
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
memcpy(&out[0], wrapped.data(), out.size());
#else
memcpy(&out[0], wrapped.begin(), out.size());
#endif
return true;
}
#endif
else
{
ERROR_MSG("unknown AES key wrap mode %i", mode);
return false;
}
}
bool BotanAES::unwrapKey(const SymmetricKey* key, const SymWrap::Type mode, const ByteString& in, ByteString& out)
{
// Check key bit length; AES only supports 128, 192 or 256 bit keys
if ((key->getBitLen() != 128) &&
(key->getBitLen() != 192) &&
(key->getBitLen() != 256))
{
ERROR_MSG("Invalid AES key length (%d bits)", key->getBitLen());
return false;
}
// Determine the unwrapping mode
if (mode == SymWrap::AES_KEYWRAP)
{
// RFC 3394 AES key wrap
if (in.size() < 24)
{
ERROR_MSG("key data to unwrap too small");
return false;
}
if ((in.size() % 8) != 0)
{
ERROR_MSG("key data to unwrap not aligned");
return false;
}
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
Botan::secure_vector<Botan::byte> wrapped(in.size());
memcpy(wrapped.data(), in.const_byte_str(), in.size());
Botan::secure_vector<Botan::byte> unwrapped;
#else
Botan::MemoryVector<Botan::byte> wrapped(in.size());
memcpy(wrapped.begin(), in.const_byte_str(), in.size());
Botan::SecureVector<Botan::byte> unwrapped;
#endif
Botan::SymmetricKey botanKey = Botan::SymmetricKey(key->getKeyBits().const_byte_str(), key->getKeyBits().size());
#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,11,14)
Botan::Algorithm_Factory& af = Botan::global_state().algorithm_factory();
try
{
unwrapped = Botan::rfc3394_keyunwrap(wrapped, botanKey, af);
}
#else
try
{
unwrapped = Botan::rfc3394_keyunwrap(wrapped, botanKey);
}
#endif
catch (...)
{
ERROR_MSG("AES key unwrap failed");
return false;
}
out.resize(unwrapped.size());
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
memcpy(&out[0], unwrapped.data(), out.size());
#else
memcpy(&out[0], unwrapped.begin(), out.size());
#endif
return true;
}
#ifdef HAVE_AES_KEY_WRAP_PAD
else if (mode == SymWrap::AES_KEYWRAP_PAD)
{
// RFC 5649 AES key wrap with wrap
if (in.size() < 16)
{
ERROR_MSG("key data to unwrap too small");
return false;
}
if ((in.size() % 8) != 0)
{
ERROR_MSG("key data to unwrap not aligned");
return false;
}
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
Botan::secure_vector<Botan::byte> wrapped(in.size());
memcpy(wrapped.data(), in.const_byte_str(), in.size());
Botan::secure_vector<Botan::byte> unwrapped;
#else
Botan::MemoryVector<Botan::byte> wrapped(in.size());
memcpy(wrapped.begin(), in.const_byte_str(), in.size());
Botan::SecureVector<Botan::byte> unwrapped;
#endif
Botan::SymmetricKey botanKey = Botan::SymmetricKey(key->getKeyBits().const_byte_str(), key->getKeyBits().size());
#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,11,14)
Botan::Algorithm_Factory& af = Botan::global_state().algorithm_factory();
try
{
unwrapped = Botan::rfc5649_keyunwrap(wrapped, botanKey, af);
}
#else
try
{
unwrapped = Botan::rfc5649_keyunwrap(wrapped, botanKey);
}
#endif
catch (...)
{
ERROR_MSG("AES key unwrap failed");
return false;
}
out.resize(unwrapped.size());
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,11,0)
memcpy(&out[0], unwrapped.data(), out.size());
#else
memcpy(&out[0], unwrapped.begin(), out.size());
#endif
return true;
}
#endif
else
{
ERROR_MSG("unknown AES key wrap mode %i", mode);
return false;
}
}
std::string BotanAES::getCipher() const
{
std::string algo;
std::string mode;
std::string padding;
if (currentKey == NULL) return "";
// Check currentKey bit length; AES only supports 128, 192 or 256 bit keys
switch (currentKey->getBitLen())
{
case 128:
algo = "AES-128";
break;
case 192:
algo = "AES-192";
break;
case 256:
algo = "AES-256";
break;
default:
ERROR_MSG("Invalid AES currentKey length (%d bits)", currentKey->getBitLen());
return "";
}
// Determine the cipher mode
switch (currentCipherMode)
{
case SymMode::CBC:
mode = "CBC";
break;
case SymMode::CTR:
return algo + "/CTR-BE";
case SymMode::ECB:
mode = "ECB";
break;
#ifdef WITH_AES_GCM
case SymMode::GCM:
return algo + "/GCM(" + std::to_string(currentTagBytes) + ")";
#endif
default:
ERROR_MSG("Invalid AES cipher mode %i", currentCipherMode);
return "";
}
// Check padding mode
if (currentPaddingMode)
{
padding = "PKCS7";
}
else
{
padding = "NoPadding";
}
return algo + "/" + mode + "/" + padding;
}
size_t BotanAES::getBlockSize() const
{
// The block size is 128 bits
return 128 >> 3;
}
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