| 1 | /* Declarations of functions and data types used for SHA256 and SHA224 sum |
| 2 | library functions. |
| 3 | Copyright (C) 2005-2006, 2008-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation, either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef SHA256_H |
| 19 | # define SHA256_H 1 |
| 20 | |
| 21 | # include <stdio.h> |
| 22 | # include <stdint.h> |
| 23 | |
| 24 | # if HAVE_OPENSSL_SHA256 |
| 25 | # include <openssl/sha.h> |
| 26 | # endif |
| 27 | |
| 28 | # ifdef __cplusplus |
| 29 | extern "C" { |
| 30 | # endif |
| 31 | |
| 32 | enum { SHA224_DIGEST_SIZE = 224 / 8 }; |
| 33 | enum { SHA256_DIGEST_SIZE = 256 / 8 }; |
| 34 | |
| 35 | # if HAVE_OPENSSL_SHA256 |
| 36 | # define GL_OPENSSL_NAME 224 |
| 37 | # include "gl_openssl.h" |
| 38 | # define GL_OPENSSL_NAME 256 |
| 39 | # include "gl_openssl.h" |
| 40 | # else |
| 41 | /* Structure to save state of computation between the single steps. */ |
| 42 | struct sha256_ctx |
| 43 | { |
| 44 | uint32_t state[8]; |
| 45 | |
| 46 | uint32_t total[2]; |
| 47 | size_t buflen; |
| 48 | uint32_t buffer[32]; |
| 49 | }; |
| 50 | |
| 51 | /* Initialize structure containing state of computation. */ |
| 52 | extern void sha256_init_ctx (struct sha256_ctx *ctx); |
| 53 | extern void sha224_init_ctx (struct sha256_ctx *ctx); |
| 54 | |
| 55 | /* Starting with the result of former calls of this function (or the |
| 56 | initialization function update the context for the next LEN bytes |
| 57 | starting at BUFFER. |
| 58 | It is necessary that LEN is a multiple of 64!!! */ |
| 59 | extern void sha256_process_block (const void *buffer, size_t len, |
| 60 | struct sha256_ctx *ctx); |
| 61 | |
| 62 | /* Starting with the result of former calls of this function (or the |
| 63 | initialization function update the context for the next LEN bytes |
| 64 | starting at BUFFER. |
| 65 | It is NOT required that LEN is a multiple of 64. */ |
| 66 | extern void sha256_process_bytes (const void *buffer, size_t len, |
| 67 | struct sha256_ctx *ctx); |
| 68 | |
| 69 | /* Process the remaining bytes in the buffer and put result from CTX |
| 70 | in first 32 (28) bytes following RESBUF. The result is always in little |
| 71 | endian byte order, so that a byte-wise output yields to the wanted |
| 72 | ASCII representation of the message digest. */ |
| 73 | extern void *sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf); |
| 74 | extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf); |
| 75 | |
| 76 | |
| 77 | /* Put result from CTX in first 32 (28) bytes following RESBUF. The result is |
| 78 | always in little endian byte order, so that a byte-wise output yields |
| 79 | to the wanted ASCII representation of the message digest. */ |
| 80 | extern void *sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf); |
| 81 | extern void *sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf); |
| 82 | |
| 83 | |
| 84 | /* Compute SHA256 (SHA224) message digest for LEN bytes beginning at BUFFER. The |
| 85 | result is always in little endian byte order, so that a byte-wise |
| 86 | output yields to the wanted ASCII representation of the message |
| 87 | digest. */ |
| 88 | extern void *sha256_buffer (const char *buffer, size_t len, void *resblock); |
| 89 | extern void *sha224_buffer (const char *buffer, size_t len, void *resblock); |
| 90 | |
| 91 | # endif |
| 92 | /* Compute SHA256 (SHA224) message digest for bytes read from STREAM. The |
| 93 | resulting message digest number will be written into the 32 (28) bytes |
| 94 | beginning at RESBLOCK. */ |
| 95 | extern int sha256_stream (FILE *stream, void *resblock); |
| 96 | extern int sha224_stream (FILE *stream, void *resblock); |
| 97 | |
| 98 | |
| 99 | # ifdef __cplusplus |
| 100 | } |
| 101 | # endif |
| 102 | |
| 103 | #endif |