src/hash/sha1/common_crypto.c

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7
   8 #include "common_crypto.h"
   9
  10 #define CC_LONG_MAX ((CC_LONG)-1)
  11
  12 int git_hash_sha1_global_init(void)
  13 {
  14         return 0;
  15 }
  16
  17 int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx)
  18 {
  19         return git_hash_sha1_init(ctx);
  20 }
  21
  22 void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx)
  23 {
  24         GIT_UNUSED(ctx);
  25 }
  26
  27 int git_hash_sha1_init(git_hash_sha1_ctx *ctx)
  28 {
  29         GIT_ASSERT_ARG(ctx);
  30         CC_SHA1_Init(&ctx->c);
  31         return 0;
  32 }
  33
  34 int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *_data, size_t len)
  35 {
  36         const unsigned char *data = _data;
  37
  38         GIT_ASSERT_ARG(ctx);
  39
  40         while (len > 0) {
  41                 CC_LONG chunk = (len > CC_LONG_MAX) ? CC_LONG_MAX : (CC_LONG)len;
  42
  43                 CC_SHA1_Update(&ctx->c, data, chunk);
  44
  45                 data += chunk;
  46                 len -= chunk;
  47         }
  48
  49         return 0;
  50 }
  51
  52 int git_hash_sha1_final(git_oid *out, git_hash_sha1_ctx *ctx)
  53 {
  54         GIT_ASSERT_ARG(ctx);
  55         CC_SHA1_Final(out->id, &ctx->c);
  56         return 0;
  57 }