freshlybakedca.ke
Git fork
1#include "git-compat-util.h"
2#include "sha1dc_git.h"
3#include "hex.h"
4
5#ifdef DC_SHA1_EXTERNAL
6/*
7 * Same as SHA1DCInit, but with default save_hash=0
8 */
9void git_SHA1DCInit(SHA1_CTX *ctx)
10{
11 SHA1DCInit(ctx);
12 SHA1DCSetSafeHash(ctx, 0);
13}
14#endif
15
16/*
17 * Same as SHA1DCFinal, but convert collision attack case into a verbose die().
18 */
19void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
20{
21 if (!SHA1DCFinal(hash, ctx))
22 return;
23 die("SHA-1 appears to be part of a collision attack: %s",
24 hash_to_hex_algop(hash, &hash_algos[GIT_HASH_SHA1]));
25}
26
27/*
28 * Same as SHA1DCUpdate, but adjust types to match git's usual interface.
29 */
30void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
31{
32 const char *data = vdata;
33 /* We expect an unsigned long, but sha1dc only takes an int */
34 while (len > INT_MAX) {
35 SHA1DCUpdate(ctx, data, INT_MAX);
36 data += INT_MAX;
37 len -= INT_MAX;
38 }
39 SHA1DCUpdate(ctx, data, len);
40}