| /* Declarations of functions and data types used for SHA256 and SHA224 sum |
| library functions. |
| Copyright (C) 2005-2006, 2008-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation, either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #ifndef SHA256_H |
| # define SHA256_H 1 |
| |
| # include <stdio.h> |
| # include <stdint.h> |
| |
| # if HAVE_OPENSSL_SHA256 |
| # include <openssl/sha.h> |
| # endif |
| |
| # ifdef __cplusplus |
| extern "C" { |
| # endif |
| |
| enum { SHA224_DIGEST_SIZE = 224 / 8 }; |
| enum { SHA256_DIGEST_SIZE = 256 / 8 }; |
| |
| # if HAVE_OPENSSL_SHA256 |
| # define GL_OPENSSL_NAME 224 |
| # include "gl_openssl.h" |
| # define GL_OPENSSL_NAME 256 |
| # include "gl_openssl.h" |
| # else |
| /* Structure to save state of computation between the single steps. */ |
| struct sha256_ctx |
| { |
| uint32_t state[8]; |
| |
| uint32_t total[2]; |
| size_t buflen; /* ≥ 0, ≤ 128 */ |
| uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */ |
| }; |
| |
| /* Initialize structure containing state of computation. */ |
| extern void sha256_init_ctx (struct sha256_ctx *ctx); |
| extern void sha224_init_ctx (struct sha256_ctx *ctx); |
| |
| /* Starting with the result of former calls of this function (or the |
| initialization function update the context for the next LEN bytes |
| starting at BUFFER. |
| It is necessary that LEN is a multiple of 64!!! */ |
| extern void sha256_process_block (const void *buffer, size_t len, |
| struct sha256_ctx *ctx); |
| |
| /* Starting with the result of former calls of this function (or the |
| initialization function update the context for the next LEN bytes |
| starting at BUFFER. |
| It is NOT required that LEN is a multiple of 64. */ |
| extern void sha256_process_bytes (const void *buffer, size_t len, |
| struct sha256_ctx *ctx); |
| |
| /* Process the remaining bytes in the buffer and put result from CTX |
| in first 32 (28) bytes following RESBUF. The result is always in little |
| endian byte order, so that a byte-wise output yields to the wanted |
| ASCII representation of the message digest. */ |
| extern void *sha256_finish_ctx (struct sha256_ctx *ctx, void *restrict resbuf); |
| extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *restrict resbuf); |
| |
| |
| /* Put result from CTX in first 32 (28) bytes following RESBUF. The result is |
| always in little endian byte order, so that a byte-wise output yields |
| to the wanted ASCII representation of the message digest. */ |
| extern void *sha256_read_ctx (const struct sha256_ctx *ctx, |
| void *restrict resbuf); |
| extern void *sha224_read_ctx (const struct sha256_ctx *ctx, |
| void *restrict resbuf); |
| |
| |
| /* Compute SHA256 (SHA224) message digest for LEN bytes beginning at BUFFER. |
| The result is always in little endian byte order, so that a byte-wise |
| output yields to the wanted ASCII representation of the message |
| digest. */ |
| extern void *sha256_buffer (const char *buffer, size_t len, |
| void *restrict resblock); |
| extern void *sha224_buffer (const char *buffer, size_t len, |
| void *restrict resblock); |
| |
| # endif |
| /* Compute SHA256 (SHA224) message digest for bytes read from STREAM. |
| STREAM is an open file stream. Regular files are handled more efficiently. |
| The contents of STREAM from its current position to its end will be read. |
| The case that the last operation on STREAM was an 'ungetc' is not supported. |
| The resulting message digest number will be written into the 32 (28) bytes |
| beginning at RESBLOCK. */ |
| extern int sha256_stream (FILE *stream, void *resblock); |
| extern int sha224_stream (FILE *stream, void *resblock); |
| |
| |
| # ifdef __cplusplus |
| } |
| # endif |
| |
| #endif |
| |
| /* |
| * Hey Emacs! |
| * Local Variables: |
| * coding: utf-8 |
| * End: |
| */ |