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768e30ea27
For all of our SHA-1 implementations and most of our SHA-256 implementations, the hash context we use is a real struct. For these implementations, it's possible to copy a hash context by making a copy of the struct. However, for our libgcrypt implementation, our hash context is a pointer. Consequently, copying it does not lead to an independent hash context like we intended. Fortunately, however, libgcrypt provides us with a handy function to copy hash contexts. Let's add a cloning function to the hash algorithm API, and use it in the one place we need to make a hash context copy. With this change, our libgcrypt SHA-256 implementation is fully functional with all of our other hash implementations. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
37 lines
894 B
C
37 lines
894 B
C
#ifndef SHA256_GCRYPT_H
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#define SHA256_GCRYPT_H
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#include <gcrypt.h>
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#define SHA256_DIGEST_SIZE 32
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typedef gcry_md_hd_t gcrypt_SHA256_CTX;
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inline void gcrypt_SHA256_Init(gcrypt_SHA256_CTX *ctx)
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{
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gcry_md_open(ctx, GCRY_MD_SHA256, 0);
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}
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inline void gcrypt_SHA256_Update(gcrypt_SHA256_CTX *ctx, const void *data, size_t len)
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{
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gcry_md_write(*ctx, data, len);
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}
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inline void gcrypt_SHA256_Final(unsigned char *digest, gcrypt_SHA256_CTX *ctx)
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{
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memcpy(digest, gcry_md_read(*ctx, GCRY_MD_SHA256), SHA256_DIGEST_SIZE);
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}
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inline void gcrypt_SHA256_Clone(gcrypt_SHA256_CTX *dst, const gcrypt_SHA256_CTX *src)
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{
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gcry_md_copy(dst, *src);
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}
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#define platform_SHA256_CTX gcrypt_SHA256_CTX
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#define platform_SHA256_Init gcrypt_SHA256_Init
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#define platform_SHA256_Clone gcrypt_SHA256_Clone
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#define platform_SHA256_Update gcrypt_SHA256_Update
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#define platform_SHA256_Final gcrypt_SHA256_Final
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#endif
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