sha1dc: build git plumbing code more explicitly
[git/git.git] / 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 }