1 #include "cache.h"
2
3 #ifdef DC_SHA1_EXTERNAL
4 /*
5 * Same as SHA1DCInit, but with default save_hash=0
6 */
git_SHA1DCInit(SHA1_CTX * ctx)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 */
git_SHA1DCFinal(unsigned char hash[20],SHA1_CTX * ctx)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 */
git_SHA1DCUpdate(SHA1_CTX * ctx,const void * vdata,unsigned long len)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 }
39