cryptopp/cbcmac.cpp at master · doublethinkco/cryptopp · GitHub

History

62 lines (48 loc) · 1.27 KB

Raw

#include "pch.h"

#ifndef CRYPTOPP_IMPORTS

#include "cbcmac.h"

NAMESPACE_BEGIN(CryptoPP)

void CBC_MAC_Base::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params)

{

AccessCipher().SetKey(key, length, params);

m_reg.CleanNew(AccessCipher().BlockSize());

m_counter = 0;

}

void CBC_MAC_Base::Update(const byte *input, size_t length)

{

unsigned int blockSize = AccessCipher().BlockSize();

while (m_counter && length)

{

m_reg[m_counter++] ^= *input++;

if (m_counter == blockSize)

ProcessBuf();

length--;

}

if (length >= blockSize)

{

size_t leftOver = AccessCipher().AdvancedProcessBlocks(m_reg, input, m_reg, length, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput);

input += (length - leftOver);

length = leftOver;

}

while (length--)

{

m_reg[m_counter++] ^= *input++;

if (m_counter == blockSize)

ProcessBuf();

}

void CBC_MAC_Base::TruncatedFinal(byte *mac, size_t size)

{

ThrowIfInvalidTruncatedSize(size);

if (m_counter)

ProcessBuf();

memcpy(mac, m_reg, size);

memset(m_reg, 0, AccessCipher().BlockSize());

}

void CBC_MAC_Base::ProcessBuf()

{

AccessCipher().ProcessBlock(m_reg);

m_counter = 0;

}

NAMESPACE_END

#endif

cryptopp/cbcmac.cpp at master · doublethinkco/cryptopp · GitHub

Uh oh!

Expand file tree

Breadcrumbs

cbcmac.cpp

Latest commit

History

Breadcrumbs

cbcmac.cpp

File metadata and controls