63 lines
1.2 KiB
C++
63 lines
1.2 KiB
C++
#include "pch.h"
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#ifndef CRYPTOPP_IMPORTS
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#include "cbcmac.h"
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NAMESPACE_BEGIN(CryptoPP)
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void CBC_MAC_Base::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
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{
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AccessCipher().SetKey(key, length, params);
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m_reg.CleanNew(AccessCipher().BlockSize());
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m_counter = 0;
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}
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void CBC_MAC_Base::Update(const byte *input, size_t length)
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{
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unsigned int blockSize = AccessCipher().BlockSize();
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while (m_counter && length)
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{
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m_reg[m_counter++] ^= *input++;
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if (m_counter == blockSize)
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ProcessBuf();
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length--;
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}
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if (length >= blockSize)
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{
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size_t leftOver = AccessCipher().AdvancedProcessBlocks(m_reg, input, m_reg, length, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput);
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input += (length - leftOver);
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length = leftOver;
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}
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while (length--)
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{
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m_reg[m_counter++] ^= *input++;
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if (m_counter == blockSize)
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ProcessBuf();
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}
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}
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void CBC_MAC_Base::TruncatedFinal(byte *mac, size_t size)
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{
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ThrowIfInvalidTruncatedSize(size);
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if (m_counter)
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ProcessBuf();
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memcpy(mac, m_reg, size);
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memset(m_reg, 0, AccessCipher().BlockSize());
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}
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void CBC_MAC_Base::ProcessBuf()
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{
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AccessCipher().ProcessBlock(m_reg);
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m_counter = 0;
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}
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NAMESPACE_END
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#endif
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