src/hash.c

   1 /*
   2  * This file is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2,
   4  * as published by the Free Software Foundation.
   5  *
   6  * In addition to the permissions in the GNU General Public License,
   7  * the authors give you unlimited permission to link the compiled
   8  * version of this file into combinations with other programs,
   9  * and to distribute those combinations without any restriction
  10  * coming from the use of this file.  (The General Public License
  11  * restrictions do apply in other respects; for example, they cover
  12  * modification of the file, and distribution when not linked into
  13  * a combined executable.)
  14  *
  15  * This file is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  23  * Boston, MA 02110-1301, USA.
  24  */
  25
  26 #include "common.h"
  27 #include "hash.h"
  28
  29 #if defined(PPC_SHA1)
  30 # include "ppc/sha1.h"
  31 #elif defined(OPENSSL_SHA1)
  32 # include <openssl/sha.h>
  33 #else
  34 # include "block-sha1/sha1.h"
  35 #endif
  36
  37 struct git_hash_ctx {
  38         SHA_CTX c;
  39 };
  40
  41 git_hash_ctx *git_hash_new_ctx(void)
  42 {
  43         git_hash_ctx *ctx = git__malloc(sizeof(*ctx));
  44
  45         if (!ctx)
  46                 return NULL;
  47
  48         SHA1_Init(&ctx->c);
  49
  50         return ctx;
  51 }
  52
  53 void git_hash_free_ctx(git_hash_ctx *ctx)
  54 {
  55         free(ctx);
  56 }
  57
  58 void git_hash_init(git_hash_ctx *ctx)
  59 {
  60         assert(ctx);
  61         SHA1_Init(&ctx->c);
  62 }
  63
  64 void git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
  65 {
  66         assert(ctx);
  67         SHA1_Update(&ctx->c, data, len);
  68 }
  69
  70 void git_hash_final(git_oid *out, git_hash_ctx *ctx)
  71 {
  72         assert(ctx);
  73         SHA1_Final(out->id, &ctx->c);
  74 }
  75
  76 void git_hash_buf(git_oid *out, const void *data, size_t len)
  77 {
  78         SHA_CTX c;
  79
  80         SHA1_Init(&c);
  81         SHA1_Update(&c, data, len);
  82         SHA1_Final(out->id, &c);
  83 }
  84
  85 void git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n)
  86 {
  87         SHA_CTX c;
  88         size_t i;
  89
  90         SHA1_Init(&c);
  91         for (i = 0; i < n; i++)
  92                 SHA1_Update(&c, vec[i].data, vec[i].len);
  93         SHA1_Final(out->id, &c);
  94 }