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