From a36c71ecb6840ff799546ccaf665e55f6a6ed5dc Mon Sep 17 00:00:00 2001
From: weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Thu, 12 Mar 2009 11:24:12 +0000
Subject: - add EAX mode, XSalsa20 - speed up GCM key setup - wipe stack in AES
 assembly code - speed up CFB mode

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@444 57ff6487-cd31-0410-9ec3-f628ee90f5f0
---
 eax.cpp | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 eax.cpp

(limited to 'eax.cpp')

diff --git a/eax.cpp b/eax.cpp
new file mode 100644
index 0000000..cf83663
--- /dev/null
+++ b/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 &params)
+{
+	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
-- 
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