thodg/libgit2/src/hash/sha1/collisiondetect.c
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Hash : 8832172e
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Date : 2019-02-22T14:32:40
hash: move SHA1 implementations to its own hashing context Create a separate `git_hash_sha1_ctx` structure that is specific to the SHA1 implementation and move all SHA1 functions over to use that one instead of the generic `git_hash_ctx`. The `git_hash_ctx` for now simply has a union containing this single SHA1 implementation, only, without any mechanism to distinguish between different algortihms.
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src/hash/sha1/collisiondetect.c
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/* * Copyright (C) the libgit2 contributors. All rights reserved. * * This file is part of libgit2, distributed under the GNU GPL v2 with * a Linking Exception. For full terms see the included COPYING file. */ #include "collisiondetect.h" int git_hash_sha1_global_init(void) { return 0; } int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx) { return git_hash_sha1_init(ctx); } void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx) { GIT_UNUSED(ctx); } int git_hash_sha1_init(git_hash_sha1_ctx *ctx) { assert(ctx); SHA1DCInit(&ctx->c); return 0; } int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len) { assert(ctx); SHA1DCUpdate(&ctx->c, data, len); return 0; } int git_hash_sha1_final(git_oid *out, git_hash_sha1_ctx *ctx) { assert(ctx); if (SHA1DCFinal(out->id, &ctx->c)) { git_error_set(GIT_ERROR_SHA1, "SHA1 collision attack detected"); return -1; } return 0; }