From 48540940b6c28bb4378abfeb500ec45a625b37b6 Mon Sep 17 00:00:00 2001
From: Vadim Dashevskiy <watcherhd@gmail.com>
Date: Tue, 15 May 2012 10:38:20 +0000
Subject: initial commit

git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
---
 plugins/CryptoPP/crypto/trunhash.h | 48 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 plugins/CryptoPP/crypto/trunhash.h

(limited to 'plugins/CryptoPP/crypto/trunhash.h')

diff --git a/plugins/CryptoPP/crypto/trunhash.h b/plugins/CryptoPP/crypto/trunhash.h
new file mode 100644
index 0000000000..16fd8c09f8
--- /dev/null
+++ b/plugins/CryptoPP/crypto/trunhash.h
@@ -0,0 +1,48 @@
+#ifndef CRYPTOPP_TRUNHASH_H
+#define CRYPTOPP_TRUNHASH_H
+
+#include "cryptlib.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+class NullHash : public HashTransformation
+{
+public:
+	void Update(const byte *input, size_t length) {}
+	unsigned int DigestSize() const {return 0;}
+	void TruncatedFinal(byte *digest, size_t digestSize) {}
+	bool TruncatedVerify(const byte *digest, size_t digestLength) {return true;}
+};
+
+//! construct new HashModule with smaller DigestSize() from existing one
+template <class T>
+class TruncatedHashTemplate : public HashTransformation
+{
+public:
+	TruncatedHashTemplate(T hm, unsigned int digestSize)
+		: m_hm(hm), m_digestSize(digestSize) {}
+	TruncatedHashTemplate(const byte *key, size_t keyLength, unsigned int digestSize)
+		: m_hm(key, keyLength), m_digestSize(digestSize) {}
+	TruncatedHashTemplate(size_t digestSize)
+		: m_digestSize(digestSize) {}
+
+	void Restart()
+		{m_hm.Restart();}
+	void Update(const byte *input, size_t length)
+		{m_hm.Update(input, length);}
+	unsigned int DigestSize() const {return m_digestSize;}
+	void TruncatedFinal(byte *digest, size_t digestSize)
+		{m_hm.TruncatedFinal(digest, digestSize);}
+	bool TruncatedVerify(const byte *digest, size_t digestLength)
+		{return m_hm.TruncatedVerify(digest, digestLength);}
+
+private:
+	T m_hm;
+	unsigned int m_digestSize;
+};
+
+typedef TruncatedHashTemplate<HashTransformation &> TruncatedHashModule;
+
+NAMESPACE_END
+
+#endif
-- 
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