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0
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1 /* sha1.c - Functions to compute SHA1 message digest of files or
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2 memory blocks according to the NIST specification FIPS-180-1.
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3
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145
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4 Copyright (C) 2000-2020 Free Software Foundation, Inc.
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0
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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, write to the Free Software Foundation,
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18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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19
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20 /* Written by Scott G. Miller
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21 Credits:
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22 Robert Klep <robert@ilse.nl> -- Expansion function fix
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23 */
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24
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25 #include <config.h>
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26
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27 #include "sha1.h"
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28
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29 #include <stddef.h>
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30 #include <string.h>
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31
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32 #if USE_UNLOCKED_IO
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33 # include "unlocked-io.h"
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34 #endif
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35
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36 #ifdef WORDS_BIGENDIAN
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37 # define SWAP(n) (n)
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38 #else
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39 # define SWAP(n) \
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40 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
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41 #endif
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42
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43 #define BLOCKSIZE 4096
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44 #if BLOCKSIZE % 64 != 0
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45 # error "invalid BLOCKSIZE"
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46 #endif
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47
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48 /* This array contains the bytes used to pad the buffer to the next
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49 64-byte boundary. (RFC 1321, 3.1: Step 1) */
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50 static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
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51
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52
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53 /* Take a pointer to a 160 bit block of data (five 32 bit ints) and
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54 initialize it to the start constants of the SHA1 algorithm. This
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55 must be called before using hash in the call to sha1_hash. */
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56 void
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57 sha1_init_ctx (struct sha1_ctx *ctx)
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58 {
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59 ctx->A = 0x67452301;
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60 ctx->B = 0xefcdab89;
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61 ctx->C = 0x98badcfe;
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62 ctx->D = 0x10325476;
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63 ctx->E = 0xc3d2e1f0;
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64
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65 ctx->total[0] = ctx->total[1] = 0;
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66 ctx->buflen = 0;
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67 }
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68
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69 /* Put result from CTX in first 20 bytes following RESBUF. The result
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70 must be in little endian byte order.
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71
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72 IMPORTANT: On some systems it is required that RESBUF is correctly
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73 aligned for a 32-bit value. */
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74 void *
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75 sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf)
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76 {
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77 ((sha1_uint32 *) resbuf)[0] = SWAP (ctx->A);
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78 ((sha1_uint32 *) resbuf)[1] = SWAP (ctx->B);
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79 ((sha1_uint32 *) resbuf)[2] = SWAP (ctx->C);
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80 ((sha1_uint32 *) resbuf)[3] = SWAP (ctx->D);
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81 ((sha1_uint32 *) resbuf)[4] = SWAP (ctx->E);
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82
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83 return resbuf;
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84 }
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85
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86 /* Process the remaining bytes in the internal buffer and the usual
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87 prolog according to the standard and write the result to RESBUF.
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88
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89 IMPORTANT: On some systems it is required that RESBUF is correctly
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90 aligned for a 32-bit value. */
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91 void *
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92 sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf)
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93 {
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94 /* Take yet unprocessed bytes into account. */
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95 sha1_uint32 bytes = ctx->buflen;
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96 size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
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97
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98 /* Now count remaining bytes. */
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99 ctx->total[0] += bytes;
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100 if (ctx->total[0] < bytes)
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101 ++ctx->total[1];
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102
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103 /* Put the 64-bit file length in *bits* at the end of the buffer. */
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104 ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
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105 ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3);
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106
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107 memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
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108
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109 /* Process last bytes. */
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110 sha1_process_block (ctx->buffer, size * 4, ctx);
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111
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112 return sha1_read_ctx (ctx, resbuf);
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113 }
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114
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115 /* Compute SHA1 message digest for bytes read from STREAM. The
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116 resulting message digest number will be written into the 16 bytes
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117 beginning at RESBLOCK. */
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118 int
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119 sha1_stream (FILE *stream, void *resblock)
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120 {
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121 struct sha1_ctx ctx;
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122 char buffer[BLOCKSIZE + 72];
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123 size_t sum;
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124
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125 /* Initialize the computation context. */
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126 sha1_init_ctx (&ctx);
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127
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128 /* Iterate over full file contents. */
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129 while (1)
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130 {
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131 /* We read the file in blocks of BLOCKSIZE bytes. One call of the
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132 computation function processes the whole buffer so that with the
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133 next round of the loop another block can be read. */
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134 size_t n;
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135 sum = 0;
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136
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137 /* Read block. Take care for partial reads. */
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138 while (1)
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139 {
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140 n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
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141
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142 sum += n;
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143
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144 if (sum == BLOCKSIZE)
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145 break;
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146
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147 if (n == 0)
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148 {
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149 /* Check for the error flag IFF N == 0, so that we don't
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150 exit the loop after a partial read due to e.g., EAGAIN
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151 or EWOULDBLOCK. */
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152 if (ferror (stream))
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153 return 1;
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154 goto process_partial_block;
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155 }
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156
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157 /* We've read at least one byte, so ignore errors. But always
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158 check for EOF, since feof may be true even though N > 0.
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159 Otherwise, we could end up calling fread after EOF. */
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160 if (feof (stream))
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161 goto process_partial_block;
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162 }
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163
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164 /* Process buffer with BLOCKSIZE bytes. Note that
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165 BLOCKSIZE % 64 == 0
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166 */
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167 sha1_process_block (buffer, BLOCKSIZE, &ctx);
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168 }
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169
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170 process_partial_block:;
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171
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172 /* Process any remaining bytes. */
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173 if (sum > 0)
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174 sha1_process_bytes (buffer, sum, &ctx);
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175
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176 /* Construct result in desired memory. */
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177 sha1_finish_ctx (&ctx, resblock);
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178 return 0;
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179 }
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180
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181 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
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182 result is always in little endian byte order, so that a byte-wise
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183 output yields to the wanted ASCII representation of the message
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184 digest. */
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185 void *
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186 sha1_buffer (const char *buffer, size_t len, void *resblock)
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187 {
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188 struct sha1_ctx ctx;
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189
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190 /* Initialize the computation context. */
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191 sha1_init_ctx (&ctx);
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192
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193 /* Process whole buffer but last len % 64 bytes. */
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194 sha1_process_bytes (buffer, len, &ctx);
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195
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196 /* Put result in desired memory area. */
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197 return sha1_finish_ctx (&ctx, resblock);
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198 }
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199
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200 void
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201 sha1_process_bytes (const void *buffer, size_t len, struct sha1_ctx *ctx)
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202 {
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203 /* When we already have some bits in our internal buffer concatenate
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204 both inputs first. */
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205 if (ctx->buflen != 0)
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206 {
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207 size_t left_over = ctx->buflen;
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208 size_t add = 128 - left_over > len ? len : 128 - left_over;
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209
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210 memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
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211 ctx->buflen += add;
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212
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213 if (ctx->buflen > 64)
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214 {
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215 sha1_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
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216
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217 ctx->buflen &= 63;
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218 /* The regions in the following copy operation cannot overlap. */
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219 memcpy (ctx->buffer,
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220 &((char *) ctx->buffer)[(left_over + add) & ~63],
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221 ctx->buflen);
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222 }
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223
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224 buffer = (const char *) buffer + add;
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225 len -= add;
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226 }
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227
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228 /* Process available complete blocks. */
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229 if (len >= 64)
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230 {
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231 #if !_STRING_ARCH_unaligned
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232 # define alignof(type) offsetof (struct { char c; type x; }, x)
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233 # define UNALIGNED_P(p) (((size_t) p) % alignof (sha1_uint32) != 0)
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234 if (UNALIGNED_P (buffer))
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235 while (len > 64)
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236 {
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237 sha1_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
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238 buffer = (const char *) buffer + 64;
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239 len -= 64;
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240 }
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241 else
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242 #endif
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243 {
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244 sha1_process_block (buffer, len & ~63, ctx);
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245 buffer = (const char *) buffer + (len & ~63);
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246 len &= 63;
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247 }
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248 }
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249
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250 /* Move remaining bytes in internal buffer. */
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251 if (len > 0)
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252 {
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253 size_t left_over = ctx->buflen;
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254
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255 memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
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256 left_over += len;
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257 if (left_over >= 64)
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258 {
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259 sha1_process_block (ctx->buffer, 64, ctx);
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260 left_over -= 64;
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261 memcpy (ctx->buffer, &ctx->buffer[16], left_over);
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262 }
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263 ctx->buflen = left_over;
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264 }
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265 }
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266
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267 /* --- Code below is the primary difference between md5.c and sha1.c --- */
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268
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269 /* SHA1 round constants */
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270 #define K1 0x5a827999
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271 #define K2 0x6ed9eba1
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272 #define K3 0x8f1bbcdc
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273 #define K4 0xca62c1d6
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274
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275 /* Round functions. Note that F2 is the same as F4. */
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276 #define F1(B,C,D) ( D ^ ( B & ( C ^ D ) ) )
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277 #define F2(B,C,D) (B ^ C ^ D)
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278 #define F3(B,C,D) ( ( B & C ) | ( D & ( B | C ) ) )
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279 #define F4(B,C,D) (B ^ C ^ D)
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280
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281 /* Process LEN bytes of BUFFER, accumulating context into CTX.
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282 It is assumed that LEN % 64 == 0.
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283 Most of this code comes from GnuPG's cipher/sha1.c. */
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284
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285 void
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286 sha1_process_block (const void *buffer, size_t len, struct sha1_ctx *ctx)
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287 {
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288 const sha1_uint32 *words = (const sha1_uint32*) buffer;
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289 size_t nwords = len / sizeof (sha1_uint32);
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290 const sha1_uint32 *endp = words + nwords;
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291 sha1_uint32 x[16];
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292 sha1_uint32 a = ctx->A;
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293 sha1_uint32 b = ctx->B;
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294 sha1_uint32 c = ctx->C;
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295 sha1_uint32 d = ctx->D;
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296 sha1_uint32 e = ctx->E;
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297
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298 /* First increment the byte count. RFC 1321 specifies the possible
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299 length of the file up to 2^64 bits. Here we only compute the
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300 number of bytes. Do a double word increment. */
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301 ctx->total[0] += len;
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111
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302 ctx->total[1] += ((len >> 31) >> 1) + (ctx->total[0] < len);
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0
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303
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304 #define rol(x, n) (((x) << (n)) | ((sha1_uint32) (x) >> (32 - (n))))
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305
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306 #define M(I) ( tm = x[I&0x0f] ^ x[(I-14)&0x0f] \
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307 ^ x[(I-8)&0x0f] ^ x[(I-3)&0x0f] \
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308 , (x[I&0x0f] = rol(tm, 1)) )
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309
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310 #define R(A,B,C,D,E,F,K,M) do { E += rol( A, 5 ) \
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311 + F( B, C, D ) \
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312 + K \
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313 + M; \
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314 B = rol( B, 30 ); \
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315 } while(0)
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316
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317 while (words < endp)
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318 {
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319 sha1_uint32 tm;
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320 int t;
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321 for (t = 0; t < 16; t++)
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322 {
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323 x[t] = SWAP (*words);
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324 words++;
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325 }
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326
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327 R( a, b, c, d, e, F1, K1, x[ 0] );
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328 R( e, a, b, c, d, F1, K1, x[ 1] );
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329 R( d, e, a, b, c, F1, K1, x[ 2] );
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330 R( c, d, e, a, b, F1, K1, x[ 3] );
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331 R( b, c, d, e, a, F1, K1, x[ 4] );
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332 R( a, b, c, d, e, F1, K1, x[ 5] );
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333 R( e, a, b, c, d, F1, K1, x[ 6] );
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334 R( d, e, a, b, c, F1, K1, x[ 7] );
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335 R( c, d, e, a, b, F1, K1, x[ 8] );
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336 R( b, c, d, e, a, F1, K1, x[ 9] );
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337 R( a, b, c, d, e, F1, K1, x[10] );
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338 R( e, a, b, c, d, F1, K1, x[11] );
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339 R( d, e, a, b, c, F1, K1, x[12] );
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340 R( c, d, e, a, b, F1, K1, x[13] );
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341 R( b, c, d, e, a, F1, K1, x[14] );
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342 R( a, b, c, d, e, F1, K1, x[15] );
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343 R( e, a, b, c, d, F1, K1, M(16) );
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344 R( d, e, a, b, c, F1, K1, M(17) );
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345 R( c, d, e, a, b, F1, K1, M(18) );
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346 R( b, c, d, e, a, F1, K1, M(19) );
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347 R( a, b, c, d, e, F2, K2, M(20) );
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348 R( e, a, b, c, d, F2, K2, M(21) );
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349 R( d, e, a, b, c, F2, K2, M(22) );
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350 R( c, d, e, a, b, F2, K2, M(23) );
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351 R( b, c, d, e, a, F2, K2, M(24) );
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352 R( a, b, c, d, e, F2, K2, M(25) );
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353 R( e, a, b, c, d, F2, K2, M(26) );
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354 R( d, e, a, b, c, F2, K2, M(27) );
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355 R( c, d, e, a, b, F2, K2, M(28) );
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356 R( b, c, d, e, a, F2, K2, M(29) );
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357 R( a, b, c, d, e, F2, K2, M(30) );
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358 R( e, a, b, c, d, F2, K2, M(31) );
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359 R( d, e, a, b, c, F2, K2, M(32) );
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360 R( c, d, e, a, b, F2, K2, M(33) );
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361 R( b, c, d, e, a, F2, K2, M(34) );
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362 R( a, b, c, d, e, F2, K2, M(35) );
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363 R( e, a, b, c, d, F2, K2, M(36) );
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364 R( d, e, a, b, c, F2, K2, M(37) );
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365 R( c, d, e, a, b, F2, K2, M(38) );
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366 R( b, c, d, e, a, F2, K2, M(39) );
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367 R( a, b, c, d, e, F3, K3, M(40) );
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368 R( e, a, b, c, d, F3, K3, M(41) );
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369 R( d, e, a, b, c, F3, K3, M(42) );
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370 R( c, d, e, a, b, F3, K3, M(43) );
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371 R( b, c, d, e, a, F3, K3, M(44) );
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372 R( a, b, c, d, e, F3, K3, M(45) );
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373 R( e, a, b, c, d, F3, K3, M(46) );
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374 R( d, e, a, b, c, F3, K3, M(47) );
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375 R( c, d, e, a, b, F3, K3, M(48) );
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376 R( b, c, d, e, a, F3, K3, M(49) );
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377 R( a, b, c, d, e, F3, K3, M(50) );
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378 R( e, a, b, c, d, F3, K3, M(51) );
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379 R( d, e, a, b, c, F3, K3, M(52) );
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380 R( c, d, e, a, b, F3, K3, M(53) );
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381 R( b, c, d, e, a, F3, K3, M(54) );
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382 R( a, b, c, d, e, F3, K3, M(55) );
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383 R( e, a, b, c, d, F3, K3, M(56) );
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384 R( d, e, a, b, c, F3, K3, M(57) );
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385 R( c, d, e, a, b, F3, K3, M(58) );
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386 R( b, c, d, e, a, F3, K3, M(59) );
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387 R( a, b, c, d, e, F4, K4, M(60) );
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388 R( e, a, b, c, d, F4, K4, M(61) );
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389 R( d, e, a, b, c, F4, K4, M(62) );
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390 R( c, d, e, a, b, F4, K4, M(63) );
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391 R( b, c, d, e, a, F4, K4, M(64) );
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392 R( a, b, c, d, e, F4, K4, M(65) );
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393 R( e, a, b, c, d, F4, K4, M(66) );
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394 R( d, e, a, b, c, F4, K4, M(67) );
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395 R( c, d, e, a, b, F4, K4, M(68) );
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396 R( b, c, d, e, a, F4, K4, M(69) );
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397 R( a, b, c, d, e, F4, K4, M(70) );
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398 R( e, a, b, c, d, F4, K4, M(71) );
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399 R( d, e, a, b, c, F4, K4, M(72) );
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400 R( c, d, e, a, b, F4, K4, M(73) );
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401 R( b, c, d, e, a, F4, K4, M(74) );
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402 R( a, b, c, d, e, F4, K4, M(75) );
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403 R( e, a, b, c, d, F4, K4, M(76) );
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404 R( d, e, a, b, c, F4, K4, M(77) );
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405 R( c, d, e, a, b, F4, K4, M(78) );
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406 R( b, c, d, e, a, F4, K4, M(79) );
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407
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408 a = ctx->A += a;
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409 b = ctx->B += b;
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410 c = ctx->C += c;
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411 d = ctx->D += d;
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412 e = ctx->E += e;
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413 }
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414 }
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