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80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/* Declarations of functions and data types used for SHA256 sum
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library functions.
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Copyright (C) 2005-2006, 2008-2022 Free Software Foundation, Inc.
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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 the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#pragma once
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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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enum { SHA256_DIGEST_SIZE = 256 / 8 };
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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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uint32_t state[8];
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uint32_t total[2];
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size_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 sha256_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, 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, 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* restrict 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* restrict resbuf);
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/* Compute SHA256 message digest for LEN bytes beginning at BUFFER.
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The 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* restrict resblock);
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#ifdef __cplusplus
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}
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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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