/* * SHA-224 and SHA-256 cryptographic hash function * * Copyright (C) 2006-2010, Brainspark B.V. * * This file is part of PolarSSL (http://www.polarssl.org) * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef _SHA2_H #define _SHA2_H #include <string.h> /** * \brief SHA-256 context structure */ typedef struct { unsigned long total[2]; /*!< number of bytes processed */ unsigned long state[8]; /*!< intermediate digest state */ unsigned char buffer[64]; /*!< data block being processed */ int is224; /*!< 0 => SHA-256, else SHA-224 */ } sha2_context; /** * \brief Output = SHA-256( input buffer ) * * \param input buffer holding the data * \param ilen length of the input data * \param output SHA-224/256 checksum result * \param is224 0 = use SHA256, 1 = use SHA224 */ void sha2( const unsigned char *input, size_t ilen, unsigned char output[32], int is224 ); /** * \brief Output = SHA-256( file contents ) * * \param path input file name * \param output SHA-224/256 checksum result * \param is224 0 = use SHA256, 1 = use SHA224 * * \return 0 if successful, 1 if fopen failed, * or 2 if fread failed */ int sha2_file( const char *path, unsigned char output[32], int is224 ); #endif /* sha2.h */