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/*
* SHA-{224,256}
* (C) 1999-2008 Jack Lloyd
* 2007 FlexSecure GmbH
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_SHA_256_H__
#define BOTAN_SHA_256_H__
#include <botan/mdx_hash.h>
namespace Botan {
/**
* Base class for the 32-bit SHA-2 hashes (SHA-224 and SHA-256)
*/
class BOTAN_DLL SHA_224_256_BASE : public MDx_HashFunction
{
protected:
void clear();
/**
* @param out output size in bytes
*/
SHA_224_256_BASE(u32bit out) :
MDx_HashFunction(out, 64, true, true) { clear(); }
SecureVector<u32bit, 64> W;
SecureVector<u32bit, 8> digest;
private:
void compress_n(const byte[], u32bit blocks);
void copy_out(byte[]);
};
/**
* SHA-224
*/
class BOTAN_DLL SHA_224 : public SHA_224_256_BASE
{
public:
void clear();
std::string name() const { return "SHA-224"; }
HashFunction* clone() const { return new SHA_224; }
SHA_224() : SHA_224_256_BASE(28) { clear(); }
};
/**
* SHA-256
*/
class BOTAN_DLL SHA_256 : public SHA_224_256_BASE
{
public:
void clear();
std::string name() const { return "SHA-256"; }
HashFunction* clone() const { return new SHA_256; }
SHA_256() : SHA_224_256_BASE(32) { clear (); }
};
}
#endif
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