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DependentExtensions/cat/crypt/hash/ICryptHash.hpp

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+/*
+	Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+	* Neither the name of LibCat nor the names of its contributors may be used
+	  to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+*/
+
+// 06/15/09 began
+
+#ifndef CAT_I_CRYPT_HASH_HPP
+#define CAT_I_CRYPT_HASH_HPP
+
+#include <cat/Platform.hpp>
+#include <cstring>
+
+namespace cat {
+
+
+// Cryptographic hash functions of any size will derive from ICryptoHash and implement its public methods
+class CAT_EXPORT ICryptHash
+{
+protected:
+    int digest_bytes;
+
+public:
+    virtual ~ICryptHash() {}
+
+    // Returns the number of bytes in a message digest produced by this hash
+    CAT_INLINE int GetDigestByteCount() { return digest_bytes; }
+
+	CAT_INLINE void CrunchString(const char *s) { Crunch(s, (int)std::strlen(s) + 1); }
+
+public:
+    // Begin a new key
+    virtual bool BeginKey(int bits) = 0;
+
+    // Start from an existing key
+    virtual bool SetKey(ICryptHash *parent) = 0;
+
+    // Begin hash function in MAC, KDF, or PRNG mode
+    virtual bool BeginMAC() = 0;
+    virtual bool BeginKDF() = 0;
+    virtual bool BeginPRNG() = 0;
+
+    // Crunch some message bytes
+    virtual void Crunch(const void *message, int bytes) = 0;
+
+    // Finalize the hash and prepare to generate output
+    virtual void End() = 0;
+
+    // Extended hash output mode
+    virtual void Generate(void *out, int bytes, int strengthening_rounds = 0) = 0;
+};
+
+
+} // namespace cat
+
+#endif // CAT_I_CRYPT_HASH_HPP