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92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/* Declarations of functions and data types used for SHA256 and SHA224 sum
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library functions.
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Copyright (C) 2005-2006, 2008-2013 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any 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 <http://www.gnu.org/licenses/>. */
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#ifndef SHA256_H
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# define SHA256_H 1
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# include <stdio.h>
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# include <stdint.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* Structure to save state of computation between the single steps. */
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struct sha256_ctx
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{
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uint32_t state[8];
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uint32_t total[2];
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size_t buflen;
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uint32_t buffer[32];
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};
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enum { SHA224_DIGEST_SIZE = 224 / 8 };
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enum { SHA256_DIGEST_SIZE = 256 / 8 };
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/* Initialize structure containing state of computation. */
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extern void sha256_init_ctx (struct sha256_ctx *ctx);
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extern void sha224_init_ctx (struct sha256_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 sha256_process_block (const void *buffer, size_t len,
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struct sha256_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 sha256_process_bytes (const void *buffer, size_t len,
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struct sha256_ctx *ctx);
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/* Process the remaining bytes in the buffer and put result from CTX
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in first 32 (28) 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 *sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf);
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extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf);
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/* Put result from CTX in first 32 (28) 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 *sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf);
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extern void *sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf);
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/* Compute SHA256 (SHA224) message digest for bytes read from STREAM. The
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resulting message digest number will be written into the 32 (28) bytes
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beginning at RESBLOCK. */
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extern int sha256_stream (FILE *stream, void *resblock);
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extern int sha224_stream (FILE *stream, void *resblock);
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/* Compute SHA256 (SHA224) 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 *sha256_buffer (const char *buffer, size_t len, void *resblock);
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extern void *sha224_buffer (const char *buffer, size_t len, 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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