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Add additional asserts in modes.cpp

pull/687/head
Jeffrey Walton 2018-07-08 22:14:17 -04:00
parent 517d552a91
commit 664d67e0f6
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GPG Key ID: B36AB348921B1838
1 changed files with 26 additions and 13 deletions
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39
modes.cpp
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@ -32,10 +32,10 @@ void CipherModeBase::ResizeBuffers()
void CFB_ModePolicy::Iterate(byte *output, const byte *input, CipherDir dir, size_t iterationCount)
{
CRYPTOPP_ASSERT(input);
CRYPTOPP_ASSERT(output);
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation()); // CFB mode needs the "encrypt" direction of the underlying block cipher, even to decrypt
CRYPTOPP_ASSERT(m_feedbackSize == BlockSize());
CRYPTOPP_ASSERT(input); CRYPTOPP_ASSERT(output);
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation());
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
CRYPTOPP_ASSERT(m_temp.size() == BlockSize());
const unsigned int s = BlockSize();
if (dir == ENCRYPTION)
@ -47,7 +47,8 @@ void CFB_ModePolicy::Iterate(byte *output, const byte *input, CipherDir dir, siz
}
else
{
memcpy(m_temp, input+(iterationCount-1)*s, s); // make copy first in case of in-place decryption
// make copy first in case of in-place decryption
memcpy(m_temp, input+(iterationCount-1)*s, s);
if (iterationCount > 1)
m_cipher->AdvancedProcessBlocks(input, input+s, output+s, (iterationCount-1)*s, BlockTransformation::BT_ReverseDirection);
m_cipher->ProcessAndXorBlock(m_register, input, output);
@ -57,9 +58,12 @@ void CFB_ModePolicy::Iterate(byte *output, const byte *input, CipherDir dir, siz
void CFB_ModePolicy::TransformRegister()
{
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation()); // CFB mode needs the "encrypt" direction of the underlying block cipher, even to decrypt
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation());
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
CRYPTOPP_ASSERT(m_temp.size() == BlockSize());
m_cipher->ProcessBlock(m_register, m_temp);
unsigned int updateSize = BlockSize()-m_feedbackSize;
const unsigned int updateSize = BlockSize()-m_feedbackSize;
memmove_s(m_register, m_register.size(), m_register+m_feedbackSize, updateSize);
memcpy_s(m_register+updateSize, m_register.size()-updateSize, m_temp, m_feedbackSize);
}
@ -67,6 +71,8 @@ void CFB_ModePolicy::TransformRegister()
void CFB_ModePolicy::CipherResynchronize(const byte *iv, size_t length)
{
CRYPTOPP_ASSERT(length == BlockSize());
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
CopyOrZero(m_register, m_register.size(), iv, length);
TransformRegister();
}
@ -86,8 +92,10 @@ void CFB_ModePolicy::ResizeBuffers()
void OFB_ModePolicy::WriteKeystream(byte *keystreamBuffer, size_t iterationCount)
{
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation()); // OFB mode needs the "encrypt" direction of the underlying block cipher, even to decrypt
unsigned int s = BlockSize();
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation());
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
const unsigned int s = BlockSize();
m_cipher->ProcessBlock(m_register, keystreamBuffer);
if (iterationCount > 1)
m_cipher->AdvancedProcessBlocks(keystreamBuffer, NULLPTR, keystreamBuffer+s, s*(iterationCount-1), 0);
@ -97,6 +105,7 @@ void OFB_ModePolicy::WriteKeystream(byte *keystreamBuffer, size_t iterationCount
void OFB_ModePolicy::CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length)
{
CRYPTOPP_UNUSED(keystreamBuffer), CRYPTOPP_UNUSED(length);
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
CRYPTOPP_ASSERT(length == BlockSize());
CopyOrZero(m_register, m_register.size(), iv, length);
@ -121,9 +130,11 @@ void CTR_ModePolicy::IncrementCounterBy256()
void CTR_ModePolicy::OperateKeystream(KeystreamOperation /*operation*/, byte *output, const byte *input, size_t iterationCount)
{
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation()); // CTR mode needs the "encrypt" direction of the underlying block cipher, even to decrypt
unsigned int s = BlockSize();
unsigned int inputIncrement = input ? s : 0;
CRYPTOPP_ASSERT(m_cipher->IsForwardTransformation());
CRYPTOPP_ASSERT(m_counterArray.size() == BlockSize());
const unsigned int s = BlockSize();
const unsigned int inputIncrement = input ? s : 0;
while (iterationCount)
{
@ -142,6 +153,7 @@ void CTR_ModePolicy::OperateKeystream(KeystreamOperation /*operation*/, byte *ou
void CTR_ModePolicy::CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length)
{
CRYPTOPP_UNUSED(keystreamBuffer), CRYPTOPP_UNUSED(length);
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
CRYPTOPP_ASSERT(length == BlockSize());
CopyOrZero(m_register, m_register.size(), iv, length);
@ -174,8 +186,9 @@ void ECB_OneWay::ProcessData(byte *outString, const byte *inString, size_t lengt
void CBC_Encryption::ProcessData(byte *outString, const byte *inString, size_t length)
{
if (!length) return;
CRYPTOPP_ASSERT(length%BlockSize()==0);
CRYPTOPP_ASSERT(m_register.size() == BlockSize());
if (!length) return;
const unsigned int blockSize = BlockSize();
m_cipher->AdvancedProcessBlocks(inString, m_register, outString, blockSize, BlockTransformation::BT_XorInput);