src/hash/sha1/collisiondetect.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 "collisiondetect.h"
   9
  10 int git_hash_sha1_global_init(void)
  11 {
  12         return 0;
  13 }
  14
  15 int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx)
  16 {
  17         return git_hash_sha1_init(ctx);
  18 }
  19
  20 void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx)
  21 {
  22         GIT_UNUSED(ctx);
  23 }
  24
  25 int git_hash_sha1_init(git_hash_sha1_ctx *ctx)
  26 {
  27         GIT_ASSERT_ARG(ctx);
  28         SHA1DCInit(&ctx->c);
  29         return 0;
  30 }
  31
  32 int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len)
  33 {
  34         GIT_ASSERT_ARG(ctx);
  35         SHA1DCUpdate(&ctx->c, data, len);
  36         return 0;
  37 }
  38
  39 int git_hash_sha1_final(unsigned char *out, git_hash_sha1_ctx *ctx)
  40 {
  41         GIT_ASSERT_ARG(ctx);
  42         if (SHA1DCFinal(out, &ctx->c)) {
  43                 git_error_set(GIT_ERROR_SHA1, "SHA1 collision attack detected");
  44                 return -1;
  45         }
  46
  47         return 0;
  48 }