From 2779fc60506e2042ab1569ffad4061f1187d186c Mon Sep 17 00:00:00 2001
From: weidai <weidai11@users.noreply.github.com>
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

---
 eax.h | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 eax.h

(limited to 'eax.h')

diff --git a/eax.h b/eax.h
new file mode 100644
index 00000000..eeacd4c9
--- /dev/null
+++ b/eax.h
@@ -0,0 +1,87 @@
+#ifndef CRYPTOPP_EAX_H
+#define CRYPTOPP_EAX_H
+
+#include "authenc.h"
+#include "modes.h"
+#include "cmac.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! .
+class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase
+{
+public:
+	// AuthenticatedSymmetricCipher
+	std::string AlgorithmName() const
+		{return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");}
+	size_t MinKeyLength() const
+		{return GetMAC().MinKeyLength();}
+	size_t MaxKeyLength() const
+		{return GetMAC().MaxKeyLength();}
+	size_t DefaultKeyLength() const
+		{return GetMAC().DefaultKeyLength();}
+	size_t GetValidKeyLength(size_t n) const
+		{return GetMAC().GetValidKeyLength(n);}
+	bool IsValidKeyLength(size_t n) const
+		{return GetMAC().IsValidKeyLength(n);}
+	unsigned int OptimalDataAlignment() const
+		{return GetMAC().OptimalDataAlignment();}
+	IV_Requirement IVRequirement() const
+		{return UNIQUE_IV;}
+	unsigned int IVSize() const
+		{return GetMAC().TagSize();}
+	unsigned int MinIVLength() const
+		{return 0;}
+	unsigned int MaxIVLength() const
+		{return UINT_MAX;}
+	unsigned int DigestSize() const
+		{return GetMAC().TagSize();}
+	lword MaxHeaderLength() const
+		{return LWORD_MAX;}
+	lword MaxMessageLength() const
+		{return LWORD_MAX;}
+
+protected:
+	// AuthenticatedSymmetricCipherBase
+	bool AuthenticationIsOnPlaintext() const
+		{return false;}
+	unsigned int AuthenticationBlockSize() const
+		{return 1;}
+	void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params);
+	void Resync(const byte *iv, size_t len);
+	size_t AuthenticateBlocks(const byte *data, size_t len);
+	void AuthenticateLastHeaderBlock();
+	void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
+	SymmetricCipher & AccessSymmetricCipher() {return m_ctr;}
+	const CMAC_Base & GetMAC() const {return const_cast<EAX_Base *>(this)->AccessMAC();}
+	virtual CMAC_Base & AccessMAC() =0;
+
+	CTR_Mode_ExternalCipher::Encryption m_ctr;
+};
+
+//! .
+template <class T_BlockCipher, bool T_IsEncryption>
+class EAX_Final : public EAX_Base
+{
+public:
+	static std::string StaticAlgorithmName()
+		{return T_BlockCipher::StaticAlgorithmName() + std::string("/EAX");}
+	bool IsForwardTransformation() const
+		{return T_IsEncryption;}
+
+private:
+	CMAC_Base & AccessMAC() {return m_cmac;}
+	CMAC<T_BlockCipher> m_cmac;
+};
+
+/// <a href="http://www.cryptolounge.org/wiki/EAX">EAX</a>
+template <class T_BlockCipher>
+struct EAX : public AuthenticatedSymmetricCipherDocumentation
+{
+	typedef EAX_Final<T_BlockCipher, true> Encryption;
+	typedef EAX_Final<T_BlockCipher, false> Decryption;
+};
+
+NAMESPACE_END
+
+#endif
-- 
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