mirror of
https://github.com/git/git.git
synced 2024-11-18 04:53:58 +01:00
3964cbbb5c
Some distros provide SHA1 collision-detect code as a shared library. It's the same code as we have in git tree (but may be with a different init default for hash), and git can link with it as well; at least, it may make maintenance easier, according to our security guys. This patch allows user to build git linking with the external sha1dc library instead of the built-in code. User needs to define DC_SHA1_EXTERNAL explicitly. As default without it, the built-in sha1dc code is used like before. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
39 lines
855 B
C
39 lines
855 B
C
#include "cache.h"
|
|
|
|
#ifdef DC_SHA1_EXTERNAL
|
|
/*
|
|
* Same as SHA1DCInit, but with default save_hash=0
|
|
*/
|
|
void git_SHA1DCInit(SHA1_CTX *ctx)
|
|
{
|
|
SHA1DCInit(ctx);
|
|
SHA1DCSetSafeHash(ctx, 0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Same as SHA1DCFinal, but convert collision attack case into a verbose die().
|
|
*/
|
|
void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
|
|
{
|
|
if (!SHA1DCFinal(hash, ctx))
|
|
return;
|
|
die("SHA-1 appears to be part of a collision attack: %s",
|
|
sha1_to_hex(hash));
|
|
}
|
|
|
|
/*
|
|
* Same as SHA1DCUpdate, but adjust types to match git's usual interface.
|
|
*/
|
|
void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
|
|
{
|
|
const char *data = vdata;
|
|
/* We expect an unsigned long, but sha1dc only takes an int */
|
|
while (len > INT_MAX) {
|
|
SHA1DCUpdate(ctx, data, INT_MAX);
|
|
data += INT_MAX;
|
|
len -= INT_MAX;
|
|
}
|
|
SHA1DCUpdate(ctx, data, len);
|
|
}
|