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62 lines
1.2 KiB
62 lines
1.2 KiB
#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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