git

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#include "git-compat-util.h"
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#include "sha1dc_git.h"
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#include "hex.h"
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#ifdef DC_SHA1_EXTERNAL
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/*
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 * Same as SHA1DCInit, but with default save_hash=0
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 */
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void git_SHA1DCInit(SHA1_CTX *ctx)
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{
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	SHA1DCInit(ctx);
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	SHA1DCSetSafeHash(ctx, 0);
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}
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#endif
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/*
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 * Same as SHA1DCFinal, but convert collision attack case into a verbose die().
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 */
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void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
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{
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	if (!SHA1DCFinal(hash, ctx))
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		return;
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	die("SHA-1 appears to be part of a collision attack: %s",
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	    hash_to_hex_algop(hash, &hash_algos[GIT_HASH_SHA1]));
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}
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/*
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 * Same as SHA1DCUpdate, but adjust types to match git's usual interface.
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 */
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void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
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{
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	const char *data = vdata;
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	/* We expect an unsigned long, but sha1dc only takes an int */
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	while (len > INT_MAX) {
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		SHA1DCUpdate(ctx, data, INT_MAX);
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		data += INT_MAX;
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		len -= INT_MAX;
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	}
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	SHA1DCUpdate(ctx, data, len);
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}
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