[821] | 1 | /*
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| 2 | * Based on shasum from http://www.netsw.org/crypto/hash/
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| 3 | * Majorly hacked up to use Dr Brian Gladman's sha1 code
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| 4 | *
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| 5 | * Copyright (C) 2002 Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
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| 6 | * Copyright (C) 2003 Glenn L. McGrath
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| 7 | * Copyright (C) 2003 Erik Andersen
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| 8 | *
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| 9 | * LICENSE TERMS
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| 10 | *
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| 11 | * The free distribution and use of this software in both source and binary
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| 12 | * form is allowed (with or without changes) provided that:
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| 13 | *
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| 14 | * 1. distributions of this source code include the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer;
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| 16 | *
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| 17 | * 2. distributions in binary form include the above copyright
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| 18 | * notice, this list of conditions and the following disclaimer
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| 19 | * in the documentation and/or other associated materials;
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| 20 | *
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| 21 | * 3. the copyright holder's name is not used to endorse products
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| 22 | * built using this software without specific written permission.
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| 23 | *
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| 24 | * ALTERNATIVELY, provided that this notice is retained in full, this product
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| 25 | * may be distributed under the terms of the GNU General Public License (GPL),
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| 26 | * in which case the provisions of the GPL apply INSTEAD OF those given above.
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| 27 | *
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| 28 | * DISCLAIMER
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| 29 | *
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| 30 | * This software is provided 'as is' with no explicit or implied warranties
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| 31 | * in respect of its properties, including, but not limited to, correctness
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| 32 | * and/or fitness for purpose.
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| 33 | * ---------------------------------------------------------------------------
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| 34 | * Issue Date: 10/11/2002
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| 35 | *
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| 36 | * This is a byte oriented version of SHA1 that operates on arrays of bytes
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| 37 | * stored in memory. It runs at 22 cycles per byte on a Pentium P4 processor
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| 38 | */
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| 39 |
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| 40 | #include <fcntl.h>
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| 41 | #include <limits.h>
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| 42 | #include <stdio.h>
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| 43 | #include <stdint.h>
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| 44 | #include <stdlib.h>
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| 45 | #include <string.h>
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| 46 | #include <unistd.h>
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| 47 |
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| 48 | #include "libbb.h"
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| 49 |
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| 50 | # define SHA1_BLOCK_SIZE 64
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| 51 | # define SHA1_DIGEST_SIZE 20
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| 52 | # define SHA1_HASH_SIZE SHA1_DIGEST_SIZE
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| 53 | # define SHA2_GOOD 0
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| 54 | # define SHA2_BAD 1
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| 55 |
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| 56 | # define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
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| 57 |
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| 58 | # define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
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| 59 |
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| 60 | /* reverse byte order in 32-bit words */
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| 61 | #define ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
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| 62 | #define parity(x,y,z) ((x) ^ (y) ^ (z))
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| 63 | #define maj(x,y,z) (((x) & (y)) | ((z) & ((x) | (y))))
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| 64 |
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| 65 | /* A normal version as set out in the FIPS. This version uses */
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| 66 | /* partial loop unrolling and is optimised for the Pentium 4 */
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| 67 | # define rnd(f,k) \
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| 68 | t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
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| 69 | e = d; d = c; c = rotl32(b, 30); b = t
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| 70 |
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| 71 |
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| 72 | static void sha1_compile(sha1_ctx_t *ctx)
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| 73 | {
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| 74 | uint32_t w[80], i, a, b, c, d, e, t;
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| 75 |
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| 76 | /* note that words are compiled from the buffer into 32-bit */
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| 77 | /* words in big-endian order so an order reversal is needed */
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| 78 | /* here on little endian machines */
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| 79 | for (i = 0; i < SHA1_BLOCK_SIZE / 4; ++i)
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| 80 | w[i] = htonl(ctx->wbuf[i]);
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| 81 |
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| 82 | for (i = SHA1_BLOCK_SIZE / 4; i < 80; ++i)
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| 83 | w[i] = rotl32(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
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| 84 |
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| 85 | a = ctx->hash[0];
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| 86 | b = ctx->hash[1];
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| 87 | c = ctx->hash[2];
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| 88 | d = ctx->hash[3];
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| 89 | e = ctx->hash[4];
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| 90 |
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| 91 | for (i = 0; i < 20; ++i) {
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| 92 | rnd(ch, 0x5a827999);
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| 93 | }
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| 94 |
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| 95 | for (i = 20; i < 40; ++i) {
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| 96 | rnd(parity, 0x6ed9eba1);
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| 97 | }
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| 98 |
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| 99 | for (i = 40; i < 60; ++i) {
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| 100 | rnd(maj, 0x8f1bbcdc);
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| 101 | }
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| 102 |
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| 103 | for (i = 60; i < 80; ++i) {
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| 104 | rnd(parity, 0xca62c1d6);
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| 105 | }
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| 106 |
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| 107 | ctx->hash[0] += a;
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| 108 | ctx->hash[1] += b;
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| 109 | ctx->hash[2] += c;
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| 110 | ctx->hash[3] += d;
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| 111 | ctx->hash[4] += e;
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| 112 | }
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| 113 |
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| 114 | void sha1_begin(sha1_ctx_t *ctx)
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| 115 | {
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| 116 | ctx->count[0] = ctx->count[1] = 0;
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| 117 | ctx->hash[0] = 0x67452301;
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| 118 | ctx->hash[1] = 0xefcdab89;
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| 119 | ctx->hash[2] = 0x98badcfe;
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| 120 | ctx->hash[3] = 0x10325476;
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| 121 | ctx->hash[4] = 0xc3d2e1f0;
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| 122 | }
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| 123 |
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| 124 | /* SHA1 hash data in an array of bytes into hash buffer and call the */
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| 125 | /* hash_compile function as required. */
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| 126 | void sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx)
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| 127 | {
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| 128 | uint32_t pos = (uint32_t) (ctx->count[0] & SHA1_MASK);
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| 129 | uint32_t freeb = SHA1_BLOCK_SIZE - pos;
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| 130 | const unsigned char *sp = data;
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| 131 |
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| 132 | if ((ctx->count[0] += length) < length)
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| 133 | ++(ctx->count[1]);
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| 134 |
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| 135 | while (length >= freeb) { /* tranfer whole blocks while possible */
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| 136 | memcpy(((unsigned char *) ctx->wbuf) + pos, sp, freeb);
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| 137 | sp += freeb;
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| 138 | length -= freeb;
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| 139 | freeb = SHA1_BLOCK_SIZE;
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| 140 | pos = 0;
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| 141 | sha1_compile(ctx);
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| 142 | }
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| 143 |
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| 144 | memcpy(((unsigned char *) ctx->wbuf) + pos, sp, length);
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| 145 | }
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| 146 |
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| 147 | void *sha1_end(void *resbuf, sha1_ctx_t *ctx)
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| 148 | {
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| 149 | /* SHA1 Final padding and digest calculation */
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| 150 | #if BB_BIG_ENDIAN
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| 151 | static uint32_t mask[4] = { 0x00000000, 0xff000000, 0xffff0000, 0xffffff00 };
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| 152 | static uint32_t bits[4] = { 0x80000000, 0x00800000, 0x00008000, 0x00000080 };
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| 153 | #else
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| 154 | static uint32_t mask[4] = { 0x00000000, 0x000000ff, 0x0000ffff, 0x00ffffff };
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| 155 | static uint32_t bits[4] = { 0x00000080, 0x00008000, 0x00800000, 0x80000000 };
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| 156 | #endif
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| 157 |
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| 158 | uint8_t *hval = resbuf;
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| 159 | uint32_t i, cnt = (uint32_t) (ctx->count[0] & SHA1_MASK);
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| 160 |
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| 161 | /* mask out the rest of any partial 32-bit word and then set */
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| 162 | /* the next byte to 0x80. On big-endian machines any bytes in */
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| 163 | /* the buffer will be at the top end of 32 bit words, on little */
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| 164 | /* endian machines they will be at the bottom. Hence the AND */
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| 165 | /* and OR masks above are reversed for little endian systems */
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| 166 | ctx->wbuf[cnt >> 2] =
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| 167 | (ctx->wbuf[cnt >> 2] & mask[cnt & 3]) | bits[cnt & 3];
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| 168 |
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| 169 | /* we need 9 or more empty positions, one for the padding byte */
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| 170 | /* (above) and eight for the length count. If there is not */
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| 171 | /* enough space pad and empty the buffer */
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| 172 | if (cnt > SHA1_BLOCK_SIZE - 9) {
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| 173 | if (cnt < 60)
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| 174 | ctx->wbuf[15] = 0;
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| 175 | sha1_compile(ctx);
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| 176 | cnt = 0;
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| 177 | } else /* compute a word index for the empty buffer positions */
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| 178 | cnt = (cnt >> 2) + 1;
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| 179 |
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| 180 | while (cnt < 14) /* and zero pad all but last two positions */
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| 181 | ctx->wbuf[cnt++] = 0;
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| 182 |
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| 183 | /* assemble the eight byte counter in the buffer in big-endian */
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| 184 | /* format */
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| 185 |
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| 186 | ctx->wbuf[14] = htonl((ctx->count[1] << 3) | (ctx->count[0] >> 29));
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| 187 | ctx->wbuf[15] = htonl(ctx->count[0] << 3);
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| 188 |
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| 189 | sha1_compile(ctx);
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| 190 |
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| 191 | /* extract the hash value as bytes in case the hash buffer is */
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| 192 | /* misaligned for 32-bit words */
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| 193 |
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| 194 | for (i = 0; i < SHA1_DIGEST_SIZE; ++i)
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| 195 | hval[i] = (unsigned char) (ctx->hash[i >> 2] >> 8 * (~i & 3));
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| 196 |
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| 197 | return resbuf;
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| 198 | }
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| 199 |
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| 200 |
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