#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 ¶ms) { 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(); std::memcpy(mac, m_reg, size); std::memset(m_reg, 0, AccessCipher().BlockSize()); } void CBC_MAC_Base::ProcessBuf() { AccessCipher().ProcessBlock(m_reg); m_counter = 0; } NAMESPACE_END #endif