Mercurial > dropbear
annotate libtomcrypt/src/prngs/rc4.c @ 1721:4877afd51e04
Added tag DROPBEAR_2020.79 for changeset e2e4929d057b
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 15 Jun 2020 23:51:39 +0800 |
parents | 6dba84798cd5 |
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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 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file prngs/rc4.c |
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13 RC4 PRNG, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_RC4 |
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17 |
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18 const struct ltc_prng_descriptor rc4_desc = |
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19 { |
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20 "rc4", |
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21 32, |
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22 &rc4_start, |
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23 &rc4_add_entropy, |
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24 &rc4_ready, |
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25 &rc4_read, |
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26 &rc4_done, |
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27 &rc4_export, |
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28 &rc4_import, |
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29 &rc4_test |
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30 }; |
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31 |
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32 /** |
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33 Start the PRNG |
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34 @param prng [out] The PRNG state to initialize |
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35 @return CRYPT_OK if successful |
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36 */ |
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37 int rc4_start(prng_state *prng) |
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38 { |
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39 LTC_ARGCHK(prng != NULL); |
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40 prng->ready = 0; |
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41 /* set entropy (key) size to zero */ |
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42 prng->rc4.s.x = 0; |
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43 /* clear entropy (key) buffer */ |
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44 XMEMSET(&prng->rc4.s.buf, 0, sizeof(prng->rc4.s.buf)); |
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45 LTC_MUTEX_INIT(&prng->lock) |
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46 return CRYPT_OK; |
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47 } |
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48 |
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49 /** |
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50 Add entropy to the PRNG state |
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51 @param in The data to add |
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52 @param inlen Length of the data to add |
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53 @param prng PRNG state to update |
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54 @return CRYPT_OK if successful |
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55 */ |
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56 int rc4_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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57 { |
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58 unsigned char buf[256]; |
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59 unsigned long i; |
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60 int err; |
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61 |
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62 LTC_ARGCHK(prng != NULL); |
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63 LTC_ARGCHK(in != NULL); |
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64 LTC_ARGCHK(inlen > 0); |
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65 |
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66 LTC_MUTEX_LOCK(&prng->lock); |
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67 if (prng->ready) { |
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68 /* rc4_ready() was already called, do "rekey" operation */ |
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69 if ((err = rc4_stream_keystream(&prng->rc4.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK; |
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70 for(i = 0; i < inlen; i++) buf[i % sizeof(buf)] ^= in[i]; |
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71 /* initialize RC4 */ |
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72 if ((err = rc4_stream_setup(&prng->rc4.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK; |
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73 /* drop first 3072 bytes - https://en.wikipedia.org/wiki/RC4#Fluhrer.2C_Mantin_and_Shamir_attack */ |
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74 for (i = 0; i < 12; i++) rc4_stream_keystream(&prng->rc4.s, buf, sizeof(buf)); |
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75 zeromem(buf, sizeof(buf)); |
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76 } |
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77 else { |
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78 /* rc4_ready() was not called yet, add entropy to the buffer */ |
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79 while (inlen--) prng->rc4.s.buf[prng->rc4.s.x++ % sizeof(prng->rc4.s.buf)] ^= *in++; |
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80 } |
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81 err = CRYPT_OK; |
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82 LBL_UNLOCK: |
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83 LTC_MUTEX_UNLOCK(&prng->lock); |
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84 return err; |
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85 } |
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86 |
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87 /** |
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88 Make the PRNG ready to read from |
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89 @param prng The PRNG to make active |
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90 @return CRYPT_OK if successful |
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91 */ |
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92 int rc4_ready(prng_state *prng) |
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93 { |
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94 unsigned char buf[256] = { 0 }; |
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95 unsigned long len; |
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96 int err, i; |
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97 |
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98 LTC_ARGCHK(prng != NULL); |
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99 |
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100 LTC_MUTEX_LOCK(&prng->lock); |
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101 if (prng->ready) { err = CRYPT_OK; goto LBL_UNLOCK; } |
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102 XMEMCPY(buf, prng->rc4.s.buf, sizeof(buf)); |
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103 /* initialize RC4 */ |
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104 len = MIN(prng->rc4.s.x, 256); /* TODO: we can perhaps always use all 256 bytes */ |
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105 if ((err = rc4_stream_setup(&prng->rc4.s, buf, len)) != CRYPT_OK) goto LBL_UNLOCK; |
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106 /* drop first 3072 bytes - https://en.wikipedia.org/wiki/RC4#Fluhrer.2C_Mantin_and_Shamir_attack */ |
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107 for (i = 0; i < 12; i++) rc4_stream_keystream(&prng->rc4.s, buf, sizeof(buf)); |
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108 prng->ready = 1; |
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109 LBL_UNLOCK: |
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110 LTC_MUTEX_UNLOCK(&prng->lock); |
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111 return err; |
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112 } |
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113 |
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114 /** |
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115 Read from the PRNG |
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116 @param out Destination |
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117 @param outlen Length of output |
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118 @param prng The active PRNG to read from |
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119 @return Number of octets read |
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120 */ |
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121 unsigned long rc4_read(unsigned char *out, unsigned long outlen, prng_state *prng) |
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122 { |
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123 if (outlen == 0 || prng == NULL || out == NULL) return 0; |
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124 LTC_MUTEX_LOCK(&prng->lock); |
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125 if (!prng->ready) { outlen = 0; goto LBL_UNLOCK; } |
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126 if (rc4_stream_keystream(&prng->rc4.s, out, outlen) != CRYPT_OK) outlen = 0; |
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127 LBL_UNLOCK: |
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128 LTC_MUTEX_UNLOCK(&prng->lock); |
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129 return outlen; |
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130 } |
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131 |
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132 /** |
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133 Terminate the PRNG |
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134 @param prng The PRNG to terminate |
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135 @return CRYPT_OK if successful |
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136 */ |
285
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137 int rc4_done(prng_state *prng) |
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138 { |
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139 int err; |
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140 LTC_ARGCHK(prng != NULL); |
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141 LTC_MUTEX_LOCK(&prng->lock); |
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142 prng->ready = 0; |
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143 err = rc4_stream_done(&prng->rc4.s); |
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144 LTC_MUTEX_UNLOCK(&prng->lock); |
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145 LTC_MUTEX_DESTROY(&prng->lock); |
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146 return err; |
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147 } |
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148 |
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149 /** |
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150 Export the PRNG state |
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151 @param out [out] Destination |
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152 @param outlen [in/out] Max size and resulting size of the state |
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153 @param prng The PRNG to export |
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154 @return CRYPT_OK if successful |
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155 */ |
285
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156 int rc4_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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157 { |
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158 unsigned long len = rc4_desc.export_size; |
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159 |
285
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160 LTC_ARGCHK(prng != NULL); |
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161 LTC_ARGCHK(out != NULL); |
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162 LTC_ARGCHK(outlen != NULL); |
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163 |
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164 if (*outlen < len) { |
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165 *outlen = len; |
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166 return CRYPT_BUFFER_OVERFLOW; |
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167 } |
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168 |
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169 if (rc4_read(out, len, prng) != len) { |
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170 return CRYPT_ERROR_READPRNG; |
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171 } |
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172 |
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173 *outlen = len; |
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174 return CRYPT_OK; |
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175 } |
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176 |
285
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177 /** |
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178 Import a PRNG state |
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179 @param in The PRNG state |
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180 @param inlen Size of the state |
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181 @param prng The PRNG to import |
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182 @return CRYPT_OK if successful |
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183 */ |
285
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184 int rc4_import(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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185 { |
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186 int err; |
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187 |
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188 LTC_ARGCHK(prng != NULL); |
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189 LTC_ARGCHK(in != NULL); |
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190 if (inlen < (unsigned long)rc4_desc.export_size) return CRYPT_INVALID_ARG; |
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191 |
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192 if ((err = rc4_start(prng)) != CRYPT_OK) return err; |
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193 if ((err = rc4_add_entropy(in, inlen, prng)) != CRYPT_OK) return err; |
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194 return CRYPT_OK; |
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195 } |
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196 |
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197 /** |
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198 PRNG self-test |
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199 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled |
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200 */ |
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201 int rc4_test(void) |
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202 { |
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203 #ifndef LTC_TEST |
285
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204 return CRYPT_NOP; |
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205 #else |
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206 prng_state st; |
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207 unsigned char en[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, |
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208 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, |
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209 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, |
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210 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, |
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211 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32 }; |
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212 unsigned char dmp[500]; |
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213 unsigned long dmplen = sizeof(dmp); |
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214 unsigned char out[1000]; |
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215 unsigned char t1[] = { 0xE0, 0x4D, 0x9A, 0xF6, 0xA8, 0x9D, 0x77, 0x53, 0xAE, 0x09 }; |
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216 unsigned char t2[] = { 0xEF, 0x80, 0xA2, 0xE6, 0x50, 0x91, 0xF3, 0x17, 0x4A, 0x8A }; |
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217 unsigned char t3[] = { 0x4B, 0xD6, 0x5C, 0x67, 0x99, 0x03, 0x56, 0x12, 0x80, 0x48 }; |
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218 int err; |
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219 |
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220 if ((err = rc4_start(&st)) != CRYPT_OK) return err; |
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221 /* add entropy to uninitialized prng */ |
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222 if ((err = rc4_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err; |
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223 if ((err = rc4_ready(&st)) != CRYPT_OK) return err; |
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224 if (rc4_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ |
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225 if (compare_testvector(out, 10, t1, sizeof(t1), "RC4-PRNG", 1)) return CRYPT_FAIL_TESTVECTOR; |
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226 if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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227 /* add entropy to already initialized prng */ |
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228 if ((err = rc4_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err; |
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229 if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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230 if ((err = rc4_export(dmp, &dmplen, &st)) != CRYPT_OK) return err; |
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231 if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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232 if (rc4_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ |
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233 if (compare_testvector(out, 10, t2, sizeof(t2), "RC4-PRNG", 2)) return CRYPT_FAIL_TESTVECTOR; |
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234 if ((err = rc4_done(&st)) != CRYPT_OK) return err; |
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235 if ((err = rc4_import(dmp, dmplen, &st)) != CRYPT_OK) return err; |
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236 if ((err = rc4_ready(&st)) != CRYPT_OK) return err; |
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237 if (rc4_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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238 if (rc4_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ |
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239 if (compare_testvector(out, 10, t3, sizeof(t3), "RC4-PRNG", 3)) return CRYPT_FAIL_TESTVECTOR; |
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240 if ((err = rc4_done(&st)) != CRYPT_OK) return err; |
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241 |
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242 return CRYPT_OK; |
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243 #endif |
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244 } |
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245 |
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246 #endif |
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247 |
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248 /* ref: $Format:%D$ */ |
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249 /* git commit: $Format:%H$ */ |
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250 /* commit time: $Format:%ai$ */ |