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

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• Hash : d46d3b53
  Author :
  Date : 2019-04-05T10:59:46
  

  hash: split into generic and SHA1-specific interface
  
  As a preparatory step to allow multiple hashing APIs to exist at
  the same time, split the hashing functions into one layer for generic
  hashing and one layer for SHA1-specific hashing. Right now, this is
  simply an additional indirection layer that doesn't yet serve any
  purpose. In the future, the generic API will be extended to allow for
  choosing which hash to use, though, by simply passing an enum to the
  hash context initialization function. This is necessary as a first step
  to be ready for Git's move to SHA256.
  

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• src/hash/sha1/openssl.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 "openssl.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);
  
  	if (SHA1_Init(&ctx->c) != 1) {
  		git_error_set(GIT_ERROR_SHA1, "hash_openssl: failed to initialize hash context");
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len)
  {
  	assert(ctx);
  
  	if (SHA1_Update(&ctx->c, data, len) != 1) {
  		git_error_set(GIT_ERROR_SHA1, "hash_openssl: failed to update hash");
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_hash_sha1_final(git_oid *out, git_hash_sha1_ctx *ctx)
  {
  	assert(ctx);
  
  	if (SHA1_Final(out->id, &ctx->c) != 1) {
  		git_error_set(GIT_ERROR_SHA1, "hash_openssl: failed to finalize hash");
  		return -1;
  	}
  
  	return 0;
  }
  

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