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https://github.com/git/git
05 April 2024, 19:32:26 UTC
Revision 84d06cdc06389ae7c462434cb7b1db0980f63860 authored by Junio C Hamano on 26 March 2021, 21:59:47 UTC, committed by Junio C Hamano on 26 March 2021, 21:59:47 UTC 
Sync with v2.31.1
2 parent s 26c4f98 + 48bf2fa
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Tip revision: 84d06cdc06389ae7c462434cb7b1db0980f63860 authored by Junio C Hamano on 26 March 2021, 21:59:47 UTC
Sync with v2.31.1
Tip revision: 84d06cd
sha1dc_git.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",
	    hash_to_hex_algop(hash, &hash_algos[GIT_HASH_SHA1]));
}

/*
 * 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);
}
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