Mercurial > dropbear

annotate src/prngs/rc4.c @ 230:809b681a9af5 libtomcrypt

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- check for generic AES/TWOFISH settings from Dropbear, not AES128 etc
author Matt Johnston <matt@ucc.asn.au>
date Tue, 30 Aug 2005 17:40:30 +0000
parents 39d5d58461d6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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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
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133 n = outlen;
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134 x = prng->rc4.x;
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135 y = prng->rc4.y;
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136 s = prng->rc4.buf;
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137 while (outlen--) {
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138 x = (x + 1) & 255;
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139 y = (y + s[x]) & 255;
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140 tmp = s[x]; s[x] = s[y]; s[y] = tmp;
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141 tmp = (s[x] + s[y]) & 255;
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142 *out++ ^= s[tmp];
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diff changeset
143 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
144 prng->rc4.x = x;
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diff changeset
145 prng->rc4.y = y;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 return n;
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parents:
diff changeset
147 }
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diff changeset
148
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diff changeset
149 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
150 Terminate the PRNG
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diff changeset
151 @param prng The PRNG to terminate
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diff changeset
152 @return CRYPT_OK if successful
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diff changeset
153 */
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diff changeset
154 int rc4_done(prng_state *prng)
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155 {
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156 LTC_ARGCHK(prng != NULL);
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diff changeset
157 return CRYPT_OK;
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158 }
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159
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160 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
161 Export the PRNG state
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diff changeset
162 @param out [out] Destination
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163 @param outlen [in/out] Max size and resulting size of the state
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164 @param prng The PRNG to export
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165 @return CRYPT_OK if successful
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166 */
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diff changeset
167 int rc4_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
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168 {
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diff changeset
169 LTC_ARGCHK(outlen != NULL);
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diff changeset
170 LTC_ARGCHK(out != NULL);
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parents:
diff changeset
171 LTC_ARGCHK(prng != NULL);
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diff changeset
172
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diff changeset
173 if (*outlen < 32) {
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diff changeset
174 return CRYPT_BUFFER_OVERFLOW;
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parents:
diff changeset
175 }
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diff changeset
176
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diff changeset
177 if (rc4_read(out, 32, prng) != 32) {
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178 return CRYPT_ERROR_READPRNG;
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diff changeset
179 }
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diff changeset
180 *outlen = 32;
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181
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182 return CRYPT_OK;
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diff changeset
183 }
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diff changeset
184
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185 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
186 Import a PRNG state
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diff changeset
187 @param in The PRNG state
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188 @param inlen Size of the state
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189 @param prng The PRNG to import
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190 @return CRYPT_OK if successful
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191 */
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diff changeset
192 int rc4_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
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parents:
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193 {
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diff changeset
194 int err;
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195 LTC_ARGCHK(in != NULL);
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diff changeset
196 LTC_ARGCHK(prng != NULL);
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diff changeset
197
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diff changeset
198 if (inlen != 32) {
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diff changeset
199 return CRYPT_INVALID_ARG;
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parents:
diff changeset
200 }
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diff changeset
201
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diff changeset
202 if ((err = rc4_start(prng)) != CRYPT_OK) {
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parents:
diff changeset
203 return err;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 }
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diff changeset
205 return rc4_add_entropy(in, 32, prng);
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parents:
diff changeset
206 }
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parents:
diff changeset
207
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diff changeset
208 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
209 PRNG self-test
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diff changeset
210 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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diff changeset
211 */
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parents:
diff changeset
212 int rc4_test(void)
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diff changeset
213 {
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diff changeset
214 #ifndef LTC_TEST
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diff changeset
215 return CRYPT_NOP;
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parents:
diff changeset
216 #else
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parents:
diff changeset
217 static const struct {
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parents:
diff changeset
218 unsigned char key[8], pt[8], ct[8];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 } tests[] = {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef },
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parents:
diff changeset
222 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef },
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parents:
diff changeset
223 { 0x75, 0xb7, 0x87, 0x80, 0x99, 0xe0, 0xc5, 0x96 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 };
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 prng_state prng;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 unsigned char dst[8];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 int err, x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
231 if ((err = rc4_start(&prng)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 if ((err = rc4_add_entropy(tests[x].key, 8, &prng)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 if ((err = rc4_ready(&prng)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 XMEMCPY(dst, tests[x].pt, 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 if (rc4_read(dst, 8, &prng) != 8) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 return CRYPT_ERROR_READPRNG;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 rc4_done(&prng);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 if (memcmp(dst, tests[x].ct, 8)) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 #if 0
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 int y;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 printf("\n\nRC4 failed, I got:\n");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 for (y = 0; y < 8; y++) printf("%02x ", dst[y]);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 printf("\n");
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 return CRYPT_FAIL_TESTVECTOR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 return CRYPT_OK;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260
209
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
261
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
262 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/rc4.c,v $ */
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parents: 191
diff changeset
263 /* $Revision: 1.3 $ */
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
264 /* $Date: 2005/05/05 14:35:59 $ */