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annotate lib/sha1.h @ 17342:c75939cb6254

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merge with default branch
author Michael Goffioul <michael.goffioul@gmail.com>
date Thu, 21 Feb 2013 14:57:31 +0000
parents e542fd46ad6f
children
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1 /* Declarations of functions and data types used for SHA1 sum
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2 library functions.
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Eric Blake <eblake@redhat.com>
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3 Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2013 Free Software
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4 Foundation, Inc.
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5
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6 This program is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, see <http://www.gnu.org/licenses/>. */
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18
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19 #ifndef SHA1_H
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20 # define SHA1_H 1
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21
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22 # include <stdio.h>
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23 # include <stdint.h>
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24
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25 # ifdef __cplusplus
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26 extern "C" {
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27 # endif
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28
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29 #define SHA1_DIGEST_SIZE 20
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30
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31 /* Structure to save state of computation between the single steps. */
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32 struct sha1_ctx
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33 {
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34 uint32_t A;
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35 uint32_t B;
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36 uint32_t C;
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37 uint32_t D;
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38 uint32_t E;
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39
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40 uint32_t total[2];
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41 uint32_t buflen;
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42 uint32_t buffer[32];
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43 };
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44
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45
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46 /* Initialize structure containing state of computation. */
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47 extern void sha1_init_ctx (struct sha1_ctx *ctx);
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48
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49 /* Starting with the result of former calls of this function (or the
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50 initialization function update the context for the next LEN bytes
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51 starting at BUFFER.
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52 It is necessary that LEN is a multiple of 64!!! */
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53 extern void sha1_process_block (const void *buffer, size_t len,
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54 struct sha1_ctx *ctx);
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55
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56 /* Starting with the result of former calls of this function (or the
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57 initialization function update the context for the next LEN bytes
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58 starting at BUFFER.
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59 It is NOT required that LEN is a multiple of 64. */
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60 extern void sha1_process_bytes (const void *buffer, size_t len,
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61 struct sha1_ctx *ctx);
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62
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63 /* Process the remaining bytes in the buffer and put result from CTX
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64 in first 20 bytes following RESBUF. The result is always in little
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65 endian byte order, so that a byte-wise output yields to the wanted
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66 ASCII representation of the message digest. */
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67 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
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68
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69
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70 /* Put result from CTX in first 20 bytes following RESBUF. The result is
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71 always in little endian byte order, so that a byte-wise output yields
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72 to the wanted ASCII representation of the message digest. */
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73 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
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74
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75
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76 /* Compute SHA1 message digest for bytes read from STREAM. The
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77 resulting message digest number will be written into the 20 bytes
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78 beginning at RESBLOCK. */
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79 extern int sha1_stream (FILE *stream, void *resblock);
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80
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81 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
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82 result is always in little endian byte order, so that a byte-wise
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83 output yields to the wanted ASCII representation of the message
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84 digest. */
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85 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
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86
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87 # ifdef __cplusplus
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88 }
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89 # endif
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90
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91 #endif