From 3438e5d3ddf8444f0e31009ffbe8237ef3752c22 Mon Sep 17 00:00:00 2001 From: Alexander Harkness Date: Sun, 24 Nov 2013 14:21:13 +0000 Subject: move cryptopp into lib --- lib/cryptopp/eax.cpp | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 lib/cryptopp/eax.cpp (limited to 'lib/cryptopp/eax.cpp') diff --git a/lib/cryptopp/eax.cpp b/lib/cryptopp/eax.cpp new file mode 100644 index 000000000..2728c9bcd --- /dev/null +++ b/lib/cryptopp/eax.cpp @@ -0,0 +1,59 @@ +// eax.cpp - written and placed in the public domain by Wei Dai + +#include "pch.h" +#include "eax.h" + +NAMESPACE_BEGIN(CryptoPP) + +void EAX_Base::SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms) +{ + AccessMAC().SetKey(userKey, keylength, params); + m_buffer.New(2*AccessMAC().TagSize()); +} + +void EAX_Base::Resync(const byte *iv, size_t len) +{ + MessageAuthenticationCode &mac = AccessMAC(); + unsigned int blockSize = mac.TagSize(); + + memset(m_buffer, 0, blockSize); + mac.Update(m_buffer, blockSize); + mac.CalculateDigest(m_buffer+blockSize, iv, len); + + m_buffer[blockSize-1] = 1; + mac.Update(m_buffer, blockSize); + + m_ctr.SetCipherWithIV(AccessMAC().AccessCipher(), m_buffer+blockSize, blockSize); +} + +size_t EAX_Base::AuthenticateBlocks(const byte *data, size_t len) +{ + AccessMAC().Update(data, len); + return 0; +} + +void EAX_Base::AuthenticateLastHeaderBlock() +{ + assert(m_bufferedDataLength == 0); + MessageAuthenticationCode &mac = AccessMAC(); + unsigned int blockSize = mac.TagSize(); + + mac.Final(m_buffer); + xorbuf(m_buffer+blockSize, m_buffer, blockSize); + + memset(m_buffer, 0, blockSize); + m_buffer[blockSize-1] = 2; + mac.Update(m_buffer, blockSize); +} + +void EAX_Base::AuthenticateLastFooterBlock(byte *tag, size_t macSize) +{ + assert(m_bufferedDataLength == 0); + MessageAuthenticationCode &mac = AccessMAC(); + unsigned int blockSize = mac.TagSize(); + + mac.TruncatedFinal(m_buffer, macSize); + xorbuf(tag, m_buffer, m_buffer+blockSize, macSize); +} + +NAMESPACE_END -- cgit v1.2.3