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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 | */ | |
9 | void 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 | */ | |
19 | void 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 | */ | |
30 | void 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 | } |