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112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* Declarations of functions and data types used for SHA1 sum
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library functions.
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Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2021 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>. */
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#ifndef SHA1_H
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# define SHA1_H 1
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# include <stdio.h>
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# include <stdint.h>
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# if HAVE_OPENSSL_SHA1
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# include <openssl/sha.h>
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# endif
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# ifdef __cplusplus
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extern "C" {
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# endif
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#define SHA1_DIGEST_SIZE 20
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# if HAVE_OPENSSL_SHA1
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# define GL_OPENSSL_NAME 1
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# include "gl_openssl.h"
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# else
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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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uint32_t A;
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uint32_t B;
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uint32_t C;
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uint32_t D;
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uint32_t E;
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uint32_t total[2];
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uint32_t buflen; /* ≥ 0, ≤ 128 */
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uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */
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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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extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *restrict 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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extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *restrict resbuf);
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/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
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result is always in little endian byte order, so that a byte-wise
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output yields to the wanted ASCII representation of the message
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digest. */
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extern void *sha1_buffer (const char *buffer, size_t len,
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void *restrict resblock);
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# endif
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/* Compute SHA1 message digest for bytes read from STREAM.
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STREAM is an open file stream. Regular files are handled more efficiently.
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The contents of STREAM from its current position to its end will be read.
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The case that the last operation on STREAM was an 'ungetc' is not supported.
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The resulting message digest number will be written into the 20 bytes
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beginning at RESBLOCK. */
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extern int sha1_stream (FILE *stream, void *resblock);
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# ifdef __cplusplus
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}
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# endif
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#endif
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/*
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* Hey Emacs!
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* Local Variables:
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* coding: utf-8
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* End:
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*/
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