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101 lines
2.9 KiB
101 lines
2.9 KiB
#ifndef HASH_H |
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#define HASH_H |
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#include "git-compat-util.h" |
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#if defined(SHA1_PPC) |
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#include "ppc/sha1.h" |
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#elif defined(SHA1_APPLE) |
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#include <CommonCrypto/CommonDigest.h> |
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#elif defined(SHA1_OPENSSL) |
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#include <openssl/sha.h> |
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#elif defined(SHA1_DC) |
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#include "sha1dc_git.h" |
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#else /* SHA1_BLK */ |
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#include "block-sha1/sha1.h" |
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#endif |
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#ifndef platform_SHA_CTX |
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/* |
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* platform's underlying implementation of SHA-1; could be OpenSSL, |
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* blk_SHA, Apple CommonCrypto, etc... Note that the relevant |
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* SHA-1 header may have already defined platform_SHA_CTX for our |
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* own implementations like block-sha1 and ppc-sha1, so we list |
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* the default for OpenSSL compatible SHA-1 implementations here. |
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*/ |
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#define platform_SHA_CTX SHA_CTX |
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#define platform_SHA1_Init SHA1_Init |
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#define platform_SHA1_Update SHA1_Update |
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#define platform_SHA1_Final SHA1_Final |
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#endif |
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#define git_SHA_CTX platform_SHA_CTX |
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#define git_SHA1_Init platform_SHA1_Init |
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#define git_SHA1_Update platform_SHA1_Update |
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#define git_SHA1_Final platform_SHA1_Final |
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#ifdef SHA1_MAX_BLOCK_SIZE |
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#include "compat/sha1-chunked.h" |
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#undef git_SHA1_Update |
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#define git_SHA1_Update git_SHA1_Update_Chunked |
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#endif |
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/* |
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* Note that these constants are suitable for indexing the hash_algos array and |
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* comparing against each other, but are otherwise arbitrary, so they should not |
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* be exposed to the user or serialized to disk. To know whether a |
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* git_hash_algo struct points to some usable hash function, test the format_id |
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* field for being non-zero. Use the name field for user-visible situations and |
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* the format_id field for fixed-length fields on disk. |
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*/ |
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/* An unknown hash function. */ |
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#define GIT_HASH_UNKNOWN 0 |
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/* SHA-1 */ |
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#define GIT_HASH_SHA1 1 |
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/* Number of algorithms supported (including unknown). */ |
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#define GIT_HASH_NALGOS (GIT_HASH_SHA1 + 1) |
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/* A suitably aligned type for stack allocations of hash contexts. */ |
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union git_hash_ctx { |
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git_SHA_CTX sha1; |
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}; |
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typedef union git_hash_ctx git_hash_ctx; |
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typedef void (*git_hash_init_fn)(git_hash_ctx *ctx); |
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typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len); |
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typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx); |
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struct git_hash_algo { |
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/* |
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* The name of the algorithm, as appears in the config file and in |
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* messages. |
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*/ |
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const char *name; |
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/* A four-byte version identifier, used in pack indices. */ |
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uint32_t format_id; |
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/* The length of the hash in binary. */ |
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size_t rawsz; |
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/* The length of the hash in hex characters. */ |
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size_t hexsz; |
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/* The hash initialization function. */ |
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git_hash_init_fn init_fn; |
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/* The hash update function. */ |
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git_hash_update_fn update_fn; |
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/* The hash finalization function. */ |
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git_hash_final_fn final_fn; |
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/* The OID of the empty tree. */ |
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const struct object_id *empty_tree; |
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/* The OID of the empty blob. */ |
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const struct object_id *empty_blob; |
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}; |
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extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS]; |
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#endif
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