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Generally, one gets better performance out of cryptographic routines written in assembly than C, and this is also true for SHA-256. In addition, most Linux distributions cannot distribute Git linked against OpenSSL for licensing reasons. Most systems with GnuPG will also have libgcrypt, since it is a dependency of GnuPG. libgcrypt is also faster than the SHA1DC implementation for messages of a few KiB and larger. For comparison, on a Core i7-6600U, this implementation processes 16 KiB chunks at 355 MiB/s while SHA1DC processes equivalent chunks at 337 MiB/s. In addition, libgcrypt is licensed under the LGPL 2.1, which is compatible with the GPL. Add an implementation of SHA-256 that uses libgcrypt. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
30 lines
727 B
C
30 lines
727 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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#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_Update gcrypt_SHA256_Update
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#define platform_SHA256_Final gcrypt_SHA256_Final
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#endif
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