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/*
Copyright (c) 2008-2010 TrueCrypt Developers Association. All rights reserved.
Governed by the TrueCrypt License 3.0 the full text of which is contained in
the file License.txt included in TrueCrypt binary and source code distribution
packages.
*/
#include "Platform/Platform.h"
#include "Cipher.h"
#include "Crypto/Aes.h"
#include "Crypto/Serpent.h"
#include "Crypto/Twofish.h"
#ifdef TC_AES_HW_CPU
# include "Crypto/Aes_hw_cpu.h"
#endif
namespace VeraCrypt
{
Cipher::Cipher () : Initialized (false)
{
}
Cipher::~Cipher ()
{
}
void Cipher::DecryptBlock (byte *data) const
{
if (!Initialized)
throw NotInitialized (SRC_POS);
Decrypt (data);
}
void Cipher::DecryptBlocks (byte *data, size_t blockCount) const
{
if (!Initialized)
throw NotInitialized (SRC_POS);
while (blockCount-- > 0)
{
Decrypt (data);
data += GetBlockSize();
}
}
void Cipher::EncryptBlock (byte *data) const
{
if (!Initialized)
throw NotInitialized (SRC_POS);
Encrypt (data);
}
void Cipher::EncryptBlocks (byte *data, size_t blockCount) const
{
if (!Initialized)
throw NotInitialized (SRC_POS);
while (blockCount-- > 0)
{
Encrypt (data);
data += GetBlockSize();
}
}
CipherList Cipher::GetAvailableCiphers ()
{
CipherList l;
l.push_back (shared_ptr <Cipher> (new CipherAES ()));
l.push_back (shared_ptr <Cipher> (new CipherSerpent ()));
l.push_back (shared_ptr <Cipher> (new CipherTwofish ()));
return l;
}
void Cipher::SetKey (const ConstBufferPtr &key)
{
if (key.Size() != GetKeySize ())
throw ParameterIncorrect (SRC_POS);
if (!Initialized)
ScheduledKey.Allocate (GetScheduledKeySize ());
SetCipherKey (key);
Key.CopyFrom (key);
Initialized = true;
}
#define TC_EXCEPTION(TYPE) TC_SERIALIZER_FACTORY_ADD(TYPE)
#undef TC_EXCEPTION_NODECL
#define TC_EXCEPTION_NODECL(TYPE) TC_SERIALIZER_FACTORY_ADD(TYPE)
TC_SERIALIZER_FACTORY_ADD_EXCEPTION_SET (CipherException);
// AES
void CipherAES::Decrypt (byte *data) const
{
#ifdef TC_AES_HW_CPU
if (IsHwSupportAvailable())
aes_hw_cpu_decrypt (ScheduledKey.Ptr() + sizeof (aes_encrypt_ctx), data);
else
#endif
aes_decrypt (data, data, (aes_decrypt_ctx *) (ScheduledKey.Ptr() + sizeof (aes_encrypt_ctx)));
}
void CipherAES::DecryptBlocks (byte *data, size_t blockCount) const
{
if (!Initialized)
throw NotInitialized (SRC_POS);
#ifdef TC_AES_HW_CPU
if ((blockCount & (32 - 1)) == 0
&& IsHwSupportAvailable())
{
while (blockCount > 0)
{
aes_hw_cpu_decrypt_32_blocks (ScheduledKey.Ptr() + sizeof (aes_encrypt_ctx), data);
data += 32 * GetBlockSize();
blockCount -= 32;
}
}
else
#endif
Cipher::DecryptBlocks (data, blockCount);
}
void CipherAES::Encrypt (byte *data) const
{
#ifdef TC_AES_HW_CPU
if (IsHwSupportAvailable())
aes_hw_cpu_encrypt (ScheduledKey.Ptr(), data);
else
#endif
aes_encrypt (data, data, (aes_encrypt_ctx *) ScheduledKey.Ptr());
}
void CipherAES::EncryptBlocks (byte *data, size_t blockCount) const
{
if (!Initialized)
throw NotInitialized (SRC_POS);
#ifdef TC_AES_HW_CPU
if ((blockCount & (32 - 1)) == 0
&& IsHwSupportAvailable())
{
while (blockCount > 0)
{
aes_hw_cpu_encrypt_32_blocks (ScheduledKey.Ptr(), data);
data += 32 * GetBlockSize();
blockCount -= 32;
}
}
else
#endif
Cipher::EncryptBlocks (data, blockCount);
}
size_t CipherAES::GetScheduledKeySize () const
{
return sizeof(aes_encrypt_ctx) + sizeof(aes_decrypt_ctx);
}
bool CipherAES::IsHwSupportAvailable () const
{
#ifdef TC_AES_HW_CPU
static bool state = false;
static bool stateValid = false;
if (!stateValid)
{
state = is_aes_hw_cpu_supported() ? true : false;
stateValid = true;
}
return state && HwSupportEnabled;
#else
return false;
#endif
}
void CipherAES::SetCipherKey (const byte *key)
{
if (aes_encrypt_key256 (key, (aes_encrypt_ctx *) ScheduledKey.Ptr()) != EXIT_SUCCESS)
throw CipherInitError (SRC_POS);
if (aes_decrypt_key256 (key, (aes_decrypt_ctx *) (ScheduledKey.Ptr() + sizeof (aes_encrypt_ctx))) != EXIT_SUCCESS)
throw CipherInitError (SRC_POS);
}
// Serpent
void CipherSerpent::Decrypt (byte *data) const
{
serpent_decrypt (data, data, ScheduledKey);
}
void CipherSerpent::Encrypt (byte *data) const
{
serpent_encrypt (data, data, ScheduledKey);
}
size_t CipherSerpent::GetScheduledKeySize () const
{
return 140*4;
}
void CipherSerpent::SetCipherKey (const byte *key)
{
serpent_set_key (key, static_cast<int> (GetKeySize ()), ScheduledKey);
}
// Twofish
void CipherTwofish::Decrypt (byte *data) const
{
twofish_decrypt ((TwofishInstance *) ScheduledKey.Ptr(), (unsigned int *)data, (unsigned int *)data);
}
void CipherTwofish::Encrypt (byte *data) const
{
twofish_encrypt ((TwofishInstance *) ScheduledKey.Ptr(), (unsigned int *)data, (unsigned int *)data);
}
size_t CipherTwofish::GetScheduledKeySize () const
{
return TWOFISH_KS;
}
void CipherTwofish::SetCipherKey (const byte *key)
{
twofish_set_key ((TwofishInstance *) ScheduledKey.Ptr(), (unsigned int *) key, static_cast<int> (GetKeySize ()) * 8);
}
bool Cipher::HwSupportEnabled = true;
}
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