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70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* Declaration of functions and data types used for SHA256 sum computing
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library functions.
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Copyright (C) 2007-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<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 <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <endian.h>
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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 H[8];
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union
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{
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uint64_t total64;
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#define TOTAL64_low (1 - (BYTE_ORDER == LITTLE_ENDIAN))
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#define TOTAL64_high (BYTE_ORDER == LITTLE_ENDIAN)
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uint32_t total[2];
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};
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uint32_t buflen;
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union
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{
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char buffer[128];
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uint32_t buffer32[32];
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uint64_t buffer64[16];
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};
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};
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/* Initialize structure containing state of computation.
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(FIPS 180-2: 5.3.2) */
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extern void __sha256_init_ctx (struct sha256_ctx *ctx) __THROW;
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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) __THROW;
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/* Process the remaining bytes in the buffer and put result from CTX
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in first 32 bytes following RESBUF.
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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 *__sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
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__THROW;
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#endif /* sha256.h */
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