1 /* $Cambridge: exim/src/src/pdkim/sha2.h,v 1.1.2.2 2009/03/17 14:56:55 tom Exp $ */
5 * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
7 * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #ifndef POLARSSL_SHA2_H
24 #define POLARSSL_SHA2_H
27 * \brief SHA-256 context structure
29 #ifndef HAVE_SHA2_CONTEXT
30 #define HAVE_SHA2_CONTEXT
31 typedef struct sha2_context sha2_context;
36 unsigned long total[2]; /*!< number of bytes processed */
37 unsigned long state[8]; /*!< intermediate digest state */
38 unsigned char buffer[64]; /*!< data block being processed */
40 unsigned char ipad[64]; /*!< HMAC: inner padding */
41 unsigned char opad[64]; /*!< HMAC: outer padding */
42 int is224; /*!< 0 => SHA-256, else SHA-224 */
50 * \brief SHA-256 context setup
52 * \param ctx context to be initialized
53 * \param is224 0 = use SHA256, 1 = use SHA224
55 void sha2_starts( sha2_context *ctx, int is224 );
58 * \brief SHA-256 process buffer
60 * \param ctx SHA-256 context
61 * \param input buffer holding the data
62 * \param ilen length of the input data
64 void sha2_update( sha2_context *ctx, unsigned char *input, int ilen );
67 * \brief SHA-256 final digest
69 * \param ctx SHA-256 context
70 * \param output SHA-224/256 checksum result
72 void sha2_finish( sha2_context *ctx, unsigned char output[32] );
75 * \brief Output = SHA-256( input buffer )
77 * \param input buffer holding the data
78 * \param ilen length of the input data
79 * \param output SHA-224/256 checksum result
80 * \param is224 0 = use SHA256, 1 = use SHA224
82 void sha2( unsigned char *input, int ilen,
83 unsigned char output[32], int is224 );
86 * \brief Output = SHA-256( file contents )
88 * \param path input file name
89 * \param output SHA-224/256 checksum result
90 * \param is224 0 = use SHA256, 1 = use SHA224
92 * \return 0 if successful, 1 if fopen failed,
93 * or 2 if fread failed
95 int sha2_file( char *path, unsigned char output[32], int is224 );
98 * \brief SHA-256 HMAC context setup
100 * \param ctx HMAC context to be initialized
101 * \param key HMAC secret key
102 * \param keylen length of the HMAC key
103 * \param is224 0 = use SHA256, 1 = use SHA224
105 void sha2_hmac_starts( sha2_context *ctx, unsigned char *key, int keylen,
109 * \brief SHA-256 HMAC process buffer
111 * \param ctx HMAC context
112 * \param input buffer holding the data
113 * \param ilen length of the input data
115 void sha2_hmac_update( sha2_context *ctx, unsigned char *input, int ilen );
118 * \brief SHA-256 HMAC final digest
120 * \param ctx HMAC context
121 * \param output SHA-224/256 HMAC checksum result
123 void sha2_hmac_finish( sha2_context *ctx, unsigned char output[32] );
126 * \brief Output = HMAC-SHA-256( hmac key, input buffer )
128 * \param key HMAC secret key
129 * \param keylen length of the HMAC key
130 * \param input buffer holding the data
131 * \param ilen length of the input data
132 * \param output HMAC-SHA-224/256 result
133 * \param is224 0 = use SHA256, 1 = use SHA224
135 void sha2_hmac( unsigned char *key, int keylen,
136 unsigned char *input, int ilen,
137 unsigned char output[32], int is224 );