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Update modes.cpp

pull/186/head
Berendea Nicolae 2016-06-25 11:58:16 +03:00 committed by GitHub
parent caec8f98e2
commit b8f42d784d
1 changed files with 39 additions and 42 deletions
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65
modes.cpp
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@ -201,30 +201,32 @@ void CBC_CTS_Encryption::ProcessLastBlock(byte *outString, const byte *inString,
// steal from IV
memcpy(outString, m_register, length);
outString = m_stolenIV;
// output last full ciphertext block
xorbuf(m_register, inString, length);
m_cipher->ProcessBlock(m_register);
memcpy(outString, m_register, BlockSize());
}
else
{
// steal from next to last block
xorbuf(m_register, inString, BlockSize());
m_cipher->ProcessBlock(m_register);
if (inString == outString)
{
length -= BlockSize();
memmove(outString, inString+BlockSize(), length);
memcpy(outString+BlockSize(), m_register, length);
}
else
{
inString += BlockSize();
length -= BlockSize();
memcpy(outString+BlockSize(), m_register, length);
}
}
// output last full ciphertext block
xorbuf(m_register, inString, length);
if (inString == outString) {
memcpy(m_buffer, outString+BlockSize(), length);
memcpy(outString+BlockSize(), m_register, length);
xorbuf(m_register, m_buffer, length);
}
else {
memcpy(outString+BlockSize(), m_register, length);
xorbuf(m_register, inString+BlockSize(), length);
}
m_cipher->ProcessBlock(m_register);
memcpy(outString, m_register, BlockSize());
}
}
// Thanks to Zireael, http://github.com/weidai11/cryptopp/pull/46
@ -259,41 +261,36 @@ void CBC_CTS_Decryption::ProcessLastBlock(byte *outString, const byte *inString,
{
pn = inString;
pn1 = m_register;
}
else
{
pn = inString + BlockSize();
pn1 = inString;
length -= BlockSize();
}
// decrypt last partial plaintext block
memcpy(m_temp, pn1, BlockSize());
m_cipher->ProcessBlock(m_temp);
xorbuf(m_temp, pn, length);
if (stealIV)
memcpy(outString, m_temp, length);
else
{
if (inString == outString)
{
memmove(outString, inString+BlockSize(), length);
memcpy(outString+BlockSize(), m_temp, length);
// decrypt next to last plaintext block
memcpy(m_temp, pn1, length);
m_cipher->ProcessBlock(m_temp);
xorbuf(outString, m_temp, m_register, BlockSize());
}
else
{
memcpy(outString+BlockSize(), m_temp, length);
length -= BlockSize();
// decrypt last partial plaintext block
memcpy(m_temp, inString, BlockSize());
m_cipher->ProcessBlock(m_temp);
xorbuf(m_temp, inString+BlockSize(), length);
// decrypt next to last plaintext block
memcpy(m_temp, pn, length);
if (inString == outString) {
memcpy(m_buffer, outString+BlockSize(), length);
memcpy(outString+BlockSize(), m_temp, length);
memcpy(m_temp, m_buffer, length);
}
else {
memcpy(outString+BlockSize(), m_temp, length);
memcpy(m_temp, inString+BlockSize(), length);
}
m_cipher->ProcessBlock(m_temp);
xorbuf(outString, m_temp, m_register, BlockSize());
}
}
}
NAMESPACE_END