mdw@git.distorted.org.uk Git - catacomb/blob - symm/sha512.h

   1 /* -*-c-*-
   2  *
   3  * Implementation of the SHA-512 hash function
   4  *
   5  * (c) 2000 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Notes on the SHA-512 hash function --------------------------------*
  29  *
  30  * SHA-1 (Secure Hash Algorithm) was designed by the NSA, for use with the
  31  * Digital Signature Algorithm.  This is an evolution with a larger output
  32  * size, intended to provide security commensurate with 256-bit AES.  At the
  33  * time of writing, SHA-512 is very new, and can't be trusted too far.  There
  34  * is also a truncated version, SHA-384, which provides security commensurate
  35  * with 192-bit AES.
  36  */
  37
  38 #ifndef CATACOMB_SHA512_H
  39 #define CATACOMB_SHA512_H
  40 #define CATACOMB_SHA384_H
  41
  42 #ifdef __cplusplus
  43   extern "C" {
  44 #endif
  45
  46 /*----- Header files ------------------------------------------------------*/
  47
  48 #include <mLib/bits.h>
  49
  50 #ifndef CATACOMB_GHASH_H
  51 #  include "ghash.h"
  52 #endif
  53
  54 /*----- Magic numbers -----------------------------------------------------*/
  55
  56 #define SHA512_BUFSZ 128
  57 #define SHA512_HASHSZ 64
  58 #define SHA512_STATESZ 64
  59
  60 #define SHA384_BUFSZ 128
  61 #define SHA384_HASHSZ 48
  62 #define SHA384_STATESZ 64
  63
  64 #define SHA512_256_BUFSZ 128
  65 #define SHA512_256_HASHSZ 32
  66 #define SHA512_256_STATESZ 64
  67
  68 #define SHA512_224_BUFSZ 128
  69 #define SHA512_224_HASHSZ 28
  70 #define SHA512_224_STATESZ 64
  71
  72 /*----- Data structures ---------------------------------------------------*/
  73
  74 typedef struct sha512_ctx {
  75   kludge64 a, b, c, d, e, f, g, h;      /* Chaining variables */
  76   uint32 nh, nl;                        /* Byte count so far */
  77   unsigned off;                         /* Offset into buffer */
  78   octet buf[SHA512_BUFSZ];              /* Accumulation buffer */
  79 } sha512_ctx, sha384_ctx, sha512_256_ctx, sha512_224_ctx;
  80
  81 /*----- Functions provided ------------------------------------------------*/
  82
  83 /* --- @sha512_compress@, etc. --- *
  84  *
  85  * Arguments:   @sha512_ctx *ctx@ = pointer to context block
  86  *              @const void *sbuf@ = pointer to buffer of appropriate size
  87  *
  88  * Returns:     ---
  89  *
  90  * Use:         SHA-512 compression function.
  91  */
  92
  93 extern void sha512_compress(sha512_ctx */*ctx*/, const void */*sbuf*/);
  94 #define sha384_compress sha512_compress
  95 #define sha512_256_compress sha512_compress
  96 #define sha512_224_compress sha512_compress
  97
  98 /* --- @sha512_init@, etc. --- *
  99  *
 100  * Arguments:   @sha512_ctx *ctx@ = pointer to context block to initialize
 101  *
 102  * Returns:     ---
 103  *
 104  * Use:         Initializes a context block ready for hashing.
 105  */
 106
 107 extern void sha512_init(sha512_ctx */*ctx*/);
 108 extern void sha384_init(sha512_ctx */*ctx*/);
 109 extern void sha512_256_init(sha512_ctx */*ctx*/);
 110 extern void sha512_224_init(sha512_ctx */*ctx*/);
 111
 112 /* --- @sha512_set@, etc. --- *
 113  *
 114  * Arguments:   @sha512_ctx *ctx@ = pointer to context block
 115  *              @const void *buf@ = pointer to state buffer
 116  *              @unsigned long count@ = current count of bytes processed
 117  *
 118  * Returns:     ---
 119  *
 120  * Use:         Initializes a context block from a given state.  This is
 121  *              useful in cases where the initial hash state is meant to be
 122  *              secret, e.g., for NMAC and HMAC support.
 123  */
 124
 125 extern void sha512_set(sha512_ctx */*ctx*/, const void */*buf*/,
 126                        unsigned long /*count*/);
 127 #define sha384_set sha512_set
 128 #define sha512_256_set sha512_set
 129 #define sha512_224_set sha512_set
 130
 131 /* --- @sha512_hash@, etc. --- *
 132  *
 133  * Arguments:   @sha512_ctx *ctx@ = pointer to context block
 134  *              @const void *buf@ = buffer of data to hash
 135  *              @size_t sz@ = size of buffer to hash
 136  *
 137  * Returns:     ---
 138  *
 139  * Use:         Hashes a buffer of data.  The buffer may be of any size and
 140  *              alignment.
 141  */
 142
 143 extern void sha512_hash(sha512_ctx */*ctx*/,
 144                         const void */*buf*/, size_t /*sz*/);
 145 #define sha384_hash sha512_hash
 146 #define sha512_256_hash sha512_hash
 147 #define sha512_224_hash sha512_hash
 148
 149 /* --- @sha512_done@, etc. --- *
 150  *
 151  * Arguments:   @sha512_ctx *ctx@ = pointer to context block
 152  *              @void *hash@ = pointer to output buffer
 153  *
 154  * Returns:     ---
 155  *
 156  * Use:         Returns the hash of the data read so far.
 157  */
 158
 159 extern void sha512_done(sha512_ctx */*ctx*/, void */*hash*/);
 160 extern void sha384_done(sha512_ctx */*ctx*/, void */*hash*/);
 161 extern void sha512_256_done(sha512_ctx */*ctx*/, void */*hash*/);
 162 extern void sha512_224_done(sha512_ctx */*ctx*/, void */*hash*/);
 163
 164 /* --- @sha512_state@, @sha384_state@ --- *
 165  *
 166  * Arguments:   @sha512_ctx *ctx@ = pointer to context
 167  *              @void *state@ = pointer to buffer for current state
 168  *
 169  * Returns:     Number of bytes written to the hash function so far.
 170  *
 171  * Use:         Returns the current state of the hash function such that
 172  *              it can be passed to @sha512_set@.
 173  */
 174
 175 extern unsigned long sha512_state(sha512_ctx */*ctx*/, void */*state*/);
 176 #define sha384_state sha512_state
 177 #define sha512_256_state sha512_state
 178 #define sha512_224_state sha512_state
 179
 180 /*----- Generic hash interface --------------------------------------------*/
 181
 182 extern const gchash sha512;
 183 extern const gchash sha384;
 184 extern const gchash sha512_256;
 185 extern const gchash sha512_224;
 186
 187 /*----- That's all, folks -------------------------------------------------*/
 188
 189 #ifdef __cplusplus
 190   }
 191 #endif
 192
 193 #endif