Mercurial > dropbear
annotate libtomcrypt/src/prngs/rc4.c @ 958:1bf92da7a2a0
Try without identifying current user
Small change that warns the user if the current user cannot be identified rather than aborting. This came in handy when I put dropbear on a dlink that did not have a true user environment. Falling back on the "-l" option and user@ options works just fine as a client. The only implication I found is that the -J option will fail ungracefully without a known own_user.
author | iquaba <cooka2011@gmail.com> |
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date | Wed, 06 Aug 2014 08:48:43 -0500 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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285
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
285
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file rc4.c |
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15 RC4 PRNG, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef RC4 |
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19 |
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20 const struct ltc_prng_descriptor rc4_desc = |
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21 { |
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22 "rc4", 32, |
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23 &rc4_start, |
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24 &rc4_add_entropy, |
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25 &rc4_ready, |
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26 &rc4_read, |
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27 &rc4_done, |
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28 &rc4_export, |
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29 &rc4_import, |
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30 &rc4_test |
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31 }; |
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32 |
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33 /** |
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34 Start the PRNG |
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35 @param prng [out] The PRNG state to initialize |
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36 @return CRYPT_OK if successful |
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37 */ |
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38 int rc4_start(prng_state *prng) |
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39 { |
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40 LTC_ARGCHK(prng != NULL); |
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41 |
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42 /* set keysize to zero */ |
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43 prng->rc4.x = 0; |
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44 |
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45 return CRYPT_OK; |
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46 } |
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47 |
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48 /** |
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49 Add entropy to the PRNG state |
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50 @param in The data to add |
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51 @param inlen Length of the data to add |
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52 @param prng PRNG state to update |
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53 @return CRYPT_OK if successful |
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54 */ |
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55 int rc4_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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56 { |
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57 LTC_ARGCHK(in != NULL); |
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58 LTC_ARGCHK(prng != NULL); |
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59 |
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60 /* trim as required */ |
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61 if (prng->rc4.x + inlen > 256) { |
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62 if (prng->rc4.x == 256) { |
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63 /* I can't possibly accept another byte, ok maybe a mint wafer... */ |
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64 return CRYPT_OK; |
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65 } else { |
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66 /* only accept part of it */ |
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67 inlen = 256 - prng->rc4.x; |
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68 } |
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69 } |
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70 |
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71 while (inlen--) { |
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72 prng->rc4.buf[prng->rc4.x++] = *in++; |
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73 } |
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74 |
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75 return CRYPT_OK; |
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76 |
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77 } |
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78 |
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79 /** |
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80 Make the PRNG ready to read from |
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81 @param prng The PRNG to make active |
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82 @return CRYPT_OK if successful |
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83 */ |
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84 int rc4_ready(prng_state *prng) |
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85 { |
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86 unsigned char key[256], tmp, *s; |
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87 int keylen, x, y, j; |
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88 |
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89 LTC_ARGCHK(prng != NULL); |
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90 |
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91 /* extract the key */ |
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92 s = prng->rc4.buf; |
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93 XMEMCPY(key, s, 256); |
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94 keylen = prng->rc4.x; |
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95 |
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96 /* make RC4 perm and shuffle */ |
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97 for (x = 0; x < 256; x++) { |
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98 s[x] = x; |
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99 } |
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100 |
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101 for (j = x = y = 0; x < 256; x++) { |
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102 y = (y + prng->rc4.buf[x] + key[j++]) & 255; |
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103 if (j == keylen) { |
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104 j = 0; |
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105 } |
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106 tmp = s[x]; s[x] = s[y]; s[y] = tmp; |
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107 } |
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108 prng->rc4.x = 0; |
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109 prng->rc4.y = 0; |
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110 |
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111 #ifdef LTC_CLEAN_STACK |
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112 zeromem(key, sizeof(key)); |
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113 #endif |
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114 |
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115 return CRYPT_OK; |
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116 } |
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117 |
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118 /** |
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119 Read from the PRNG |
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120 @param out Destination |
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121 @param outlen Length of output |
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122 @param prng The active PRNG to read from |
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123 @return Number of octets read |
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124 */ |
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125 unsigned long rc4_read(unsigned char *out, unsigned long outlen, prng_state *prng) |
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126 { |
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127 unsigned char x, y, *s, tmp; |
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128 unsigned long n; |
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129 |
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130 LTC_ARGCHK(out != NULL); |
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131 LTC_ARGCHK(prng != NULL); |
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132 |
382
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133 #ifdef LTC_VALGRIND |
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134 zeromem(out, outlen); |
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135 #endif |
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136 |
285
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137 n = outlen; |
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138 x = prng->rc4.x; |
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139 y = prng->rc4.y; |
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140 s = prng->rc4.buf; |
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141 while (outlen--) { |
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142 x = (x + 1) & 255; |
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143 y = (y + s[x]) & 255; |
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144 tmp = s[x]; s[x] = s[y]; s[y] = tmp; |
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145 tmp = (s[x] + s[y]) & 255; |
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146 *out++ ^= s[tmp]; |
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147 } |
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148 prng->rc4.x = x; |
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149 prng->rc4.y = y; |
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150 return n; |
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151 } |
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152 |
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153 /** |
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154 Terminate the PRNG |
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155 @param prng The PRNG to terminate |
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156 @return CRYPT_OK if successful |
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157 */ |
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158 int rc4_done(prng_state *prng) |
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159 { |
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160 LTC_ARGCHK(prng != NULL); |
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161 return CRYPT_OK; |
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162 } |
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163 |
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164 /** |
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165 Export the PRNG state |
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166 @param out [out] Destination |
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167 @param outlen [in/out] Max size and resulting size of the state |
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168 @param prng The PRNG to export |
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169 @return CRYPT_OK if successful |
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170 */ |
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171 int rc4_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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172 { |
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173 LTC_ARGCHK(outlen != NULL); |
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174 LTC_ARGCHK(out != NULL); |
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175 LTC_ARGCHK(prng != NULL); |
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176 |
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177 if (*outlen < 32) { |
382
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178 *outlen = 32; |
285
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179 return CRYPT_BUFFER_OVERFLOW; |
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180 } |
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181 |
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182 if (rc4_read(out, 32, prng) != 32) { |
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183 return CRYPT_ERROR_READPRNG; |
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184 } |
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185 *outlen = 32; |
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186 |
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187 return CRYPT_OK; |
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188 } |
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189 |
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190 /** |
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191 Import a PRNG state |
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192 @param in The PRNG state |
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193 @param inlen Size of the state |
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194 @param prng The PRNG to import |
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195 @return CRYPT_OK if successful |
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196 */ |
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197 int rc4_import(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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198 { |
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199 int err; |
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200 LTC_ARGCHK(in != NULL); |
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201 LTC_ARGCHK(prng != NULL); |
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202 |
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203 if (inlen != 32) { |
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204 return CRYPT_INVALID_ARG; |
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205 } |
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206 |
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207 if ((err = rc4_start(prng)) != CRYPT_OK) { |
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208 return err; |
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209 } |
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210 return rc4_add_entropy(in, 32, prng); |
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211 } |
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212 |
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213 /** |
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214 PRNG self-test |
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215 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled |
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216 */ |
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217 int rc4_test(void) |
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218 { |
382
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219 #if !defined(LTC_TEST) || defined(LTC_VALGRIND) |
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220 return CRYPT_NOP; |
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221 #else |
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222 static const struct { |
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223 unsigned char key[8], pt[8], ct[8]; |
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224 } tests[] = { |
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225 { |
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226 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef }, |
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227 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef }, |
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228 { 0x75, 0xb7, 0x87, 0x80, 0x99, 0xe0, 0xc5, 0x96 } |
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229 } |
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230 }; |
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231 prng_state prng; |
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232 unsigned char dst[8]; |
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233 int err, x; |
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234 |
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235 for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) { |
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236 if ((err = rc4_start(&prng)) != CRYPT_OK) { |
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237 return err; |
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238 } |
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239 if ((err = rc4_add_entropy(tests[x].key, 8, &prng)) != CRYPT_OK) { |
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240 return err; |
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241 } |
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242 if ((err = rc4_ready(&prng)) != CRYPT_OK) { |
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243 return err; |
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244 } |
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245 XMEMCPY(dst, tests[x].pt, 8); |
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246 if (rc4_read(dst, 8, &prng) != 8) { |
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247 return CRYPT_ERROR_READPRNG; |
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248 } |
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249 rc4_done(&prng); |
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250 if (XMEMCMP(dst, tests[x].ct, 8)) { |
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251 #if 0 |
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252 int y; |
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253 printf("\n\nRC4 failed, I got:\n"); |
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254 for (y = 0; y < 8; y++) printf("%02x ", dst[y]); |
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255 printf("\n"); |
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256 #endif |
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257 return CRYPT_FAIL_TESTVECTOR; |
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258 } |
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259 } |
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260 return CRYPT_OK; |
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261 #endif |
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262 } |
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263 |
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264 #endif |
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265 |
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266 |
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267 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/rc4.c,v $ */ |
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268 /* $Revision: 1.9 $ */ |
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269 /* $Date: 2006/11/16 00:32:18 $ */ |