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94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/* Declaration of functions and data types used for SHA1 sum computing
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library functions.
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Copyright (C) 2008 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2008.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _SHA1_H
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#define _SHA1_H 1
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#define SHA1_DIGEST_SIZE 20
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#define SHA1_BLOCK_SIZE 64
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typedef uint32_t sha1_uint32;
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typedef uintptr_t sha1_uintptr;
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/* Structure to save state of computation between the single steps. */
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struct sha1_ctx
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{
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sha1_uint32 A;
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sha1_uint32 B;
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sha1_uint32 C;
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sha1_uint32 D;
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sha1_uint32 E;
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sha1_uint32 total[2];
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sha1_uint32 buflen;
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char buffer[128] __attribute__ ((__aligned__ (__alignof__ (sha1_uint32))));
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};
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/* Initialize structure containing state of computation. */
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extern void sha1_init_ctx (struct sha1_ctx *ctx);
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/* Starting with the result of former calls of this function (or the
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initialization function update the context for the next LEN bytes
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starting at BUFFER.
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It is necessary that LEN is a multiple of 64!!! */
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extern void sha1_process_block (const void *buffer, size_t len,
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struct sha1_ctx *ctx);
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/* Starting with the result of former calls of this function (or the
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initialization function update the context for the next LEN bytes
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starting at BUFFER.
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It is NOT required that LEN is a multiple of 64. */
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extern void sha1_process_bytes (const void *buffer, size_t len,
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struct sha1_ctx *ctx);
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/* Process the remaining bytes in the buffer and put result from CTX
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in first 20 bytes following RESBUF. The result is always in little
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endian byte order, so that a byte-wise output yields to the wanted
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ASCII representation of the message digest.
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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32 bits value. */
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extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
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/* Put result from CTX in first 20 bytes following RESBUF. The result is
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always in little endian byte order, so that a byte-wise output yields
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to the wanted ASCII representation of the message digest.
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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32 bits value. */
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extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
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#endif /* sha1.h */
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