sha1-git.h

/*
 * sha1-git.h
 *
 * This code is based on the GIT SHA1 Implementation.
 *
 * Copyright (C) 2009 Linus Torvalds <torvalds@linux-foundation.org>
 * Copyright (C) 2009 Nicolas Pitre <nico@cam.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 */

/*
 * SHA1 routine optimized to do word accesses rather than byte accesses,
 * and to avoid unnecessary copies into the context array.
 *
 * This was initially based on the Mozilla SHA1 implementation, although
 * none of the original Mozilla code remains.
 */

typedef struct {
	unsigned long long size;
	unsigned int h0,h1,h2,h3,h4;
	unsigned int W[16];
} blk_SHA_CTX;

void blk_SHA1_Init(blk_SHA_CTX *ctx);
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *dataIn, unsigned long len);
void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx);

#define git_SHA_CTX	blk_SHA_CTX
#define git_SHA1_Init	blk_SHA1_Init
#define git_SHA1_Update	blk_SHA1_Update
#define git_SHA1_Final	blk_SHA1_Final
#define SHA_DIGEST_LENGTH 20