crypto/sha.h

   1 /* sha.h
   2  *
   3  * The sha1 and sha256 hash functions.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2001 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  23  * MA 02111-1307, USA.
  24  */
  25
  26 #ifndef NETTLE_SHA_H_INCLUDED
  27 #define NETTLE_SHA_H_INCLUDED
  28
  29 #include <inttypes.h>
  30
  31 /* Name mangling */
  32 #define sha1_init nettle_sha1_init
  33 #define sha1_update nettle_sha1_update
  34 #define sha1_digest nettle_sha1_digest
  35 #define sha256_init nettle_sha256_init
  36 #define sha256_update nettle_sha256_update
  37 #define sha256_digest nettle_sha256_digest
  38
  39 /* SHA1 */
  40
  41 #define SHA1_DIGEST_SIZE 20
  42 #define SHA1_DATA_SIZE 64
  43
  44 /* Digest is kept internally as 5 32-bit words. */
  45 #define _SHA1_DIGEST_LENGTH 5
  46
  47 struct sha1_ctx
  48 {
  49   uint32_t digest[_SHA1_DIGEST_LENGTH];   /* Message digest */
  50   uint32_t count_low, count_high;         /* 64-bit block count */
  51   uint8_t block[SHA1_DATA_SIZE];          /* SHA1 data buffer */
  52   unsigned int index;                     /* index into buffer */
  53 };
  54
  55 void
  56 sha1_init(struct sha1_ctx *ctx);
  57
  58 void
  59 sha1_update(struct sha1_ctx *ctx,
  60             unsigned length,
  61             const uint8_t *data);
  62
  63 void
  64 sha1_digest(struct sha1_ctx *ctx,
  65             unsigned length,
  66             uint8_t *digest);
  67
  68 /* SHA256 */
  69
  70 #define SHA256_DIGEST_SIZE 32
  71 #define SHA256_DATA_SIZE 64
  72
  73 /* Digest is kept internally as 8 32-bit words. */
  74 #define _SHA256_DIGEST_LENGTH 8
  75
  76 struct sha256_ctx
  77 {
  78   uint32_t state[_SHA256_DIGEST_LENGTH];    /* State variables */
  79   uint32_t count_low, count_high;           /* 64-bit block count */
  80   uint8_t block[SHA256_DATA_SIZE];          /* SHA256 data buffer */
  81   unsigned int index;                       /* index into buffer */
  82 };
  83
  84 void
  85 sha256_init(struct sha256_ctx *ctx);
  86
  87 void
  88 sha256_update(struct sha256_ctx *ctx,
  89               unsigned length,
  90               const uint8_t *data);
  91
  92 void
  93 sha256_digest(struct sha256_ctx *ctx,
  94               unsigned length,
  95               uint8_t *digest);
  96
  97
  98 #endif /* NETTLE_SHA_H_INCLUDED */