sha1dc_git.c

   1 #include "cache.h"
   2
   3 /*
   4  * Same as SHA1DCFinal, but convert collision attack case into a verbose die().
   5  */
   6 void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
   7 {
   8         if (!SHA1DCFinal(hash, ctx))
   9                 return;
  10         die("SHA-1 appears to be part of a collision attack: %s",
  11             sha1_to_hex(hash));
  12 }
  13
  14 /*
  15  * Same as SHA1DCUpdate, but adjust types to match git's usual interface.
  16  */
  17 void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
  18 {
  19         const char *data = vdata;
  20         /* We expect an unsigned long, but sha1dc only takes an int */
  21         while (len > INT_MAX) {
  22                 SHA1DCUpdate(ctx, data, INT_MAX);
  23                 data += INT_MAX;
  24                 len -= INT_MAX;
  25         }
  26         SHA1DCUpdate(ctx, data, len);
  27 }