thodg/libgit2/src/hash/sha1/collisiondetect.c

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• Hash : 8832172e
  Author :
  Date : 2019-02-22T14:32:40
  

  hash: move SHA1 implementations to its own hashing context Create a separate `git_hash_sha1_ctx` structure that is specific to the SHA1 implementation and move all SHA1 functions over to use that one instead of the generic `git_hash_ctx`. The `git_hash_ctx` for now simply has a union containing this single SHA1 implementation, only, without any mechanism to distinguish between different algortihms.

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• src/hash/sha1/collisiondetect.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "collisiondetect.h"
  
  int git_hash_sha1_global_init(void)
  {
  	return 0;
  }
  
  int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx)
  {
  	return git_hash_sha1_init(ctx);
  }
  
  void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx)
  {
  	GIT_UNUSED(ctx);
  }
  
  int git_hash_sha1_init(git_hash_sha1_ctx *ctx)
  {
  	assert(ctx);
  	SHA1DCInit(&ctx->c);
  	return 0;
  }
  
  int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len)
  {
  	assert(ctx);
  	SHA1DCUpdate(&ctx->c, data, len);
  	return 0;
  }
  
  int git_hash_sha1_final(git_oid *out, git_hash_sha1_ctx *ctx)
  {
  	assert(ctx);
  	if (SHA1DCFinal(out->id, &ctx->c)) {
  		git_error_set(GIT_ERROR_SHA1, "SHA1 collision attack detected");
  		return -1;
  	}
  
  	return 0;
  }
  

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