Merge branch 'rs/help-unknown-ref-does-not-return'
[git/git.git] / sha1dc_git.c
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1#include "cache.h"
2
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3#ifdef DC_SHA1_EXTERNAL
4/*
5 * Same as SHA1DCInit, but with default save_hash=0
6 */
7void git_SHA1DCInit(SHA1_CTX *ctx)
8{
9 SHA1DCInit(ctx);
10 SHA1DCSetSafeHash(ctx, 0);
11}
12#endif
13
a0103914 14/*
36f048c5 15 * Same as SHA1DCFinal, but convert collision attack case into a verbose die().
a0103914 16 */
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17void 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 sha1_to_hex(hash));
23}
24
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25/*
26 * Same as SHA1DCUpdate, but adjust types to match git's usual interface.
27 */
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28void 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}