sha1dc_git.c

   1 #include "cache.h"
   2
   3 #ifdef DC_SHA1_EXTERNAL
   4 /*
   5  * Same as SHA1DCInit, but with default save_hash=0
   6  */
   7 void git_SHA1DCInit(SHA1_CTX *ctx)
   8 {
   9         SHA1DCInit(ctx);
  10         SHA1DCSetSafeHash(ctx, 0);
  11 }
  12 #endif
  13
  14 /*
  15  * Same as SHA1DCFinal, but convert collision attack case into a verbose die().
  16  */
  17 void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
  18 {
  19         if (!SHA1DCFinal(hash, ctx))
  20                 return;
  21         die("SHA-1 appears to be part of a collision attack: %s",
  22             hash_to_hex_algop(hash, &hash_algos[GIT_HASH_SHA1]));
  23 }
  24
  25 /*
  26  * Same as SHA1DCUpdate, but adjust types to match git's usual interface.
  27  */
  28 void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
  29 {
  30         const char *data = vdata;
  31         /* We expect an unsigned long, but sha1dc only takes an int */
  32         while (len > INT_MAX) {
  33                 SHA1DCUpdate(ctx, data, INT_MAX);
  34                 data += INT_MAX;
  35                 len -= INT_MAX;
  36         }
  37         SHA1DCUpdate(ctx, data, len);
  38 }