#include "git-compat-util.h"

#include "sha1dc_git.h"

#include "hex.h"

#ifdef DC_SHA1_EXTERNAL

/*

 * Same as SHA1DCInit, but with default save_hash=0

 */

void git_SHA1DCInit(SHA1_CTX *ctx)

{

  SHA1DCInit(ctx);

  SHA1DCSetSafeHash(ctx, 0);

}

#endif

/*

 * Same as SHA1DCFinal, but convert collision attack case into a verbose die().

 */

void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)

{

  if (!SHA1DCFinal(hash, ctx))

    return;

  die("SHA-1 appears to be part of a collision attack: %s",

      hash_to_hex_algop(hash, &hash_algos[GIT_HASH_SHA1]));

}

/*

 * Same as SHA1DCUpdate, but adjust types to match git's usual interface.

 */

void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)

{

  const char *data = vdata;

  /* We expect an unsigned long, but sha1dc only takes an int */

  while (len > INT_MAX) {

    SHA1DCUpdate(ctx, data, INT_MAX);

    data += INT_MAX;

    len -= INT_MAX;

  }

  SHA1DCUpdate(ctx, data, len);

}