www.pudn.com > emule.rar > cbcmac.cpp

#include "pch.h" 
 
#ifndef CRYPTOPP_IMPORTS 
 
#include "cbcmac.h" 
 
NAMESPACE_BEGIN(CryptoPP) 
 
void CBC_MAC_Base::CheckedSetKey(void *, Empty empty, const byte *key, unsigned int length, const NameValuePairs ¶ms) 
{ 
	AccessCipher().SetKey(key, length, params); 
	m_reg.CleanNew(AccessCipher().BlockSize()); 
	m_counter = 0; 
} 
 
void CBC_MAC_Base::Update(const byte *input, unsigned int length) 
{ 
	unsigned int blockSize = AccessCipher().BlockSize(); 
 
	while (m_counter && length) 
	{ 
		m_reg[m_counter++] ^= *input++; 
		if (m_counter == blockSize) 
			ProcessBuf(); 
		length--; 
	} 
 
	while (length >= blockSize) 
	{ 
		xorbuf(m_reg, input, blockSize); 
		ProcessBuf(); 
		input += blockSize; 
		length -= blockSize; 
	} 
 
	while (length--) 
	{ 
		m_reg[m_counter++] ^= *input++; 
		if (m_counter == blockSize) 
			ProcessBuf(); 
	} 
} 
 
void CBC_MAC_Base::TruncatedFinal(byte *mac, unsigned int 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