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3bc72fde3f
The git source uses git_SHA1_Update() and friends to call into the code that computes the hashes. Traditionally, we used to map these directly to underlying implementation of the SHA-1 hash (e.g. SHA1_Update() from OpenSSL or blk_SHA1_Update() from block-sha1/). This arrangement however makes it hard to tweak behaviour of the underlying implementation without fully replacing. If we want to introduce a tweaked_SHA1_Update() wrapper to implement the "Update" in a slightly different way, for example, the implementation of the wrapper still would want to call into the underlying implementation, but tweaked_SHA1_Update() cannot call git_SHA1_Update() to get to the underlying implementation (often but not always SHA1_Update()). Add another level of indirection that maps platform_SHA1_Update() and friends to their underlying implementations, and by default make git_SHA1_Update() and friends map to platform_SHA1_* functions. Doing it this way will later allow us to map git_SHA1_Update() to tweaked_SHA1_Update(), and the latter can use platform_SHA1_Update() in its implementation. Signed-off-by: Atousa Pahlevan Duprat <apahlevan@ieee.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
26 lines
579 B
C
26 lines
579 B
C
/*
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* SHA-1 implementation.
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*
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* Copyright (C) 2005 Paul Mackerras <paulus@samba.org>
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*/
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#include <stdint.h>
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typedef struct {
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uint32_t hash[5];
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uint32_t cnt;
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uint64_t len;
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union {
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unsigned char b[64];
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uint64_t l[8];
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} buf;
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} ppc_SHA_CTX;
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int ppc_SHA1_Init(ppc_SHA_CTX *c);
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int ppc_SHA1_Update(ppc_SHA_CTX *c, const void *p, unsigned long n);
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int ppc_SHA1_Final(unsigned char *hash, ppc_SHA_CTX *c);
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#define platform_SHA_CTX ppc_SHA_CTX
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#define platform_SHA1_Init ppc_SHA1_Init
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#define platform_SHA1_Update ppc_SHA1_Update
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#define platform_SHA1_Final ppc_SHA1_Final
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