/*

 * 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 "builtin.h"

int git_hash_sha256_global_init(void)

{

  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 (SHA256Reset(&ctx->c)) {

    git_error_set(GIT_ERROR_SHA, "SHA256 error");

    return -1;

  }

  return 0;

}

int git_hash_sha256_update(git_hash_sha256_ctx *ctx, const void *_data, size_t len)

{

  const unsigned char *data = _data;

  GIT_ASSERT_ARG(ctx);

  while (len > 0) {

    unsigned int chunk = (len > UINT_MAX) ? UINT_MAX : (unsigned int)len;

    if (SHA256Input(&ctx->c, data, chunk)) {

      git_error_set(GIT_ERROR_SHA, "SHA256 error");

      return -1;

    }

    data += chunk;

    len -= chunk;

  }

  return 0;

}

int git_hash_sha256_final(unsigned char *out, git_hash_sha256_ctx *ctx)

{

  GIT_ASSERT_ARG(ctx);

  if (SHA256Result(&ctx->c, out)) {

    git_error_set(GIT_ERROR_SHA, "SHA256 error");

    return -1;

  }

  return 0;

}