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

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• Hash : 3bd9bb8d
  Author :
  Date : 2022-04-04T13:28:40
  

  sha256: support dynamically loaded openssl

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• src/util/hash/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"
  
  #ifdef GIT_OPENSSL_DYNAMIC
  # include <dlfcn.h>
  
  int handle_count;
  void *openssl_handle;
  
  static int git_hash_openssl_global_shutdown(void)
  {
  	if (--handle_count == 0) {
  		dlclose(openssl_handle);
  		openssl_handle = NULL;
  	}
  
  	return 0;
  }
  
  static int git_hash_openssl_global_init(void)
  {
  	if (!handle_count) {
  		if ((openssl_handle = dlopen("libssl.so.1.1", RTLD_NOW)) == NULL &&
  		    (openssl_handle = dlopen("libssl.1.1.dylib", RTLD_NOW)) == NULL &&
  		    (openssl_handle = dlopen("libssl.so.1.0.0", RTLD_NOW)) == NULL &&
  		    (openssl_handle = dlopen("libssl.1.0.0.dylib", RTLD_NOW)) == NULL &&
  		    (openssl_handle = dlopen("libssl.so.10", RTLD_NOW)) == NULL) {
  			git_error_set(GIT_ERROR_SSL, "could not load ssl libraries");
  			return -1;
  		}
  	}
  
  	if (git_hash_openssl_global_shutdown() < 0)
  		return -1;
  
  	handle_count++;
  	return 0;
  }
  
  #endif
  
  #ifdef GIT_SHA1_OPENSSL
  
  # ifdef GIT_OPENSSL_DYNAMIC
  static int (*SHA1_Init)(SHA_CTX *c);
  static int (*SHA1_Update)(SHA_CTX *c, const void *data, size_t len);
  static int (*SHA1_Final)(unsigned char *md, SHA_CTX *c);
  # endif
  
  int git_hash_sha1_global_init(void)
  {
  #ifdef GIT_OPENSSL_DYNAMIC
  	if (git_hash_openssl_global_init() < 0)
  		return -1;
  
  	if ((SHA1_Init = dlsym(openssl_handle, "SHA1_Init")) == NULL ||
  	    (SHA1_Update = dlsym(openssl_handle, "SHA1_Update")) == NULL ||
  	    (SHA1_Final = dlsym(openssl_handle, "SHA1_Final")) == NULL) {
  		const char *msg = dlerror();
  		git_error_set(GIT_ERROR_SSL, "could not load hash function: %s", msg ? msg : "unknown error");
  		return -1;
  	}
  #endif
  
  	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)
  {
  	GIT_ASSERT_ARG(ctx);
  
  	if (SHA1_Init(&ctx->c) != 1) {
  		git_error_set(GIT_ERROR_SHA, "failed to initialize sha1 context");
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len)
  {
  	GIT_ASSERT_ARG(ctx);
  
  	if (SHA1_Update(&ctx->c, data, len) != 1) {
  		git_error_set(GIT_ERROR_SHA, "failed to update sha1");
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_hash_sha1_final(unsigned char *out, git_hash_sha1_ctx *ctx)
  {
  	GIT_ASSERT_ARG(ctx);
  
  	if (SHA1_Final(out, &ctx->c) != 1) {
  		git_error_set(GIT_ERROR_SHA, "failed to finalize sha1");
  		return -1;
  	}
  
  	return 0;
  }
  
  #endif
  
  #ifdef GIT_SHA256_OPENSSL
  
  # ifdef GIT_OPENSSL_DYNAMIC
  static int (*SHA256_Init)(SHA256_CTX *c);
  static int (*SHA256_Update)(SHA256_CTX *c, const void *data, size_t len);
  static int (*SHA256_Final)(unsigned char *md, SHA256_CTX *c);
  #endif
  
  int git_hash_sha256_global_init(void)
  {
  #ifdef GIT_OPENSSL_DYNAMIC
  	if (git_hash_openssl_global_init() < 0)
  		return -1;
  
  	if ((SHA256_Init = dlsym(openssl_handle, "SHA256_Init")) == NULL ||
  	    (SHA256_Update = dlsym(openssl_handle, "SHA256_Update")) == NULL ||
  	    (SHA256_Final = dlsym(openssl_handle, "SHA256_Final")) == NULL) {
  		const char *msg = dlerror();
  		git_error_set(GIT_ERROR_SSL, "could not load hash function: %s", msg ? msg : "unknown error");
  		return -1;
  	}
  #endif
  
  	return 0;
  }
  
  int git_hash_sha256_ctx_init(git_hash_sha256_ctx *ctx)
  {
  	return git_hash_sha256_init(ctx);
  }
  
  void git_hash_sha256_ctx_cleanup(git_hash_sha256_ctx *ctx)
  {
  	GIT_UNUSED(ctx);
  }
  
  int git_hash_sha256_init(git_hash_sha256_ctx *ctx)
  {
  	GIT_ASSERT_ARG(ctx);
  
  	if (SHA256_Init(&ctx->c) != 1) {
  		git_error_set(GIT_ERROR_SHA, "failed to initialize sha256 context");
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_hash_sha256_update(git_hash_sha256_ctx *ctx, const void *data, size_t len)
  {
  	GIT_ASSERT_ARG(ctx);
  
  	if (SHA256_Update(&ctx->c, data, len) != 1) {
  		git_error_set(GIT_ERROR_SHA, "failed to update sha256");
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_hash_sha256_final(unsigned char *out, git_hash_sha256_ctx *ctx)
  {
  	GIT_ASSERT_ARG(ctx);
  
  	if (SHA256_Final(out, &ctx->c) != 1) {
  		git_error_set(GIT_ERROR_SHA, "failed to finalize sha256");
  		return -1;
  	}
  
  	return 0;
  }
  
  #endif
  

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