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#include "git-compat-util.h"
#include "sha1dc_git.h"
#include "hex.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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