sha1dc_git.c

   1 #include "cache.h"
   2 #include "hex.h"
   3
   4 #ifdef DC_SHA1_EXTERNAL
   5 /*
   6  * Same as SHA1DCInit, but with default save_hash=0
   7  */
   8 void git_SHA1DCInit(SHA1_CTX *ctx)
   9 {
  10         SHA1DCInit(ctx);
  11         SHA1DCSetSafeHash(ctx, 0);
  12 }
  13 #endif
  14
  15 /*
  16  * Same as SHA1DCFinal, but convert collision attack case into a verbose die().
  17  */
  18 void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
  19 {
  20         if (!SHA1DCFinal(hash, ctx))
  21                 return;
  22         die("SHA-1 appears to be part of a collision attack: %s",
  23             hash_to_hex_algop(hash, &hash_algos[GIT_HASH_SHA1]));
  24 }
  25
  26 /*
  27  * Same as SHA1DCUpdate, but adjust types to match git's usual interface.
  28  */
  29 void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
  30 {
  31         const char *data = vdata;
  32         /* We expect an unsigned long, but sha1dc only takes an int */
  33         while (len > INT_MAX) {
  34                 SHA1DCUpdate(ctx, data, INT_MAX);
  35                 data += INT_MAX;
  36                 len -= INT_MAX;
  37         }
  38         SHA1DCUpdate(ctx, data, len);
  39 }