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annotate libtomcrypt/src/prngs/chacha20.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 /* the idea of re-keying loosely follows the approach used in:
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11 * http://bxr.su/OpenBSD/lib/libc/crypt/arc4random.c
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12 */
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13
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_CHACHA20_PRNG
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17
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18 const struct ltc_prng_descriptor chacha20_prng_desc =
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19 {
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20 "chacha20",
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21 40,
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22 &chacha20_prng_start,
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23 &chacha20_prng_add_entropy,
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24 &chacha20_prng_ready,
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25 &chacha20_prng_read,
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26 &chacha20_prng_done,
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27 &chacha20_prng_export,
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28 &chacha20_prng_import,
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29 &chacha20_prng_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 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 chacha20_prng_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 XMEMSET(&prng->chacha.ent, 0, sizeof(prng->chacha.ent));
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42 prng->chacha.idx = 0;
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43 LTC_MUTEX_INIT(&prng->lock)
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44 return CRYPT_OK;
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45 }
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46
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47 /**
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48 Add entropy to the PRNG state
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49 @param in The data to add
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50 @param inlen Length of the data to add
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51 @param prng PRNG state to update
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52 @return CRYPT_OK if successful
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53 */
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54 int chacha20_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
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55 {
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56 unsigned char buf[40];
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57 unsigned long i;
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58 int err;
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59
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60 LTC_ARGCHK(prng != NULL);
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61 LTC_ARGCHK(in != NULL);
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62 LTC_ARGCHK(inlen > 0);
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63
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64 LTC_MUTEX_LOCK(&prng->lock);
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65 if (prng->ready) {
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66 /* chacha20_prng_ready() was already called, do "rekey" operation */
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67 if ((err = chacha_keystream(&prng->chacha.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK;
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68 for(i = 0; i < inlen; i++) buf[i % sizeof(buf)] ^= in[i];
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69 /* key 32 bytes, 20 rounds */
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70 if ((err = chacha_setup(&prng->chacha.s, buf, 32, 20)) != CRYPT_OK) goto LBL_UNLOCK;
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71 /* iv 8 bytes */
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72 if ((err = chacha_ivctr64(&prng->chacha.s, buf + 32, 8, 0)) != CRYPT_OK) goto LBL_UNLOCK;
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73 /* clear KEY + IV */
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74 zeromem(buf, sizeof(buf));
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75 }
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76 else {
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77 /* chacha20_prng_ready() was not called yet, add entropy to ent buffer */
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78 while (inlen--) prng->chacha.ent[prng->chacha.idx++ % sizeof(prng->chacha.ent)] ^= *in++;
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79 }
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80 err = CRYPT_OK;
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81 LBL_UNLOCK:
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82 LTC_MUTEX_UNLOCK(&prng->lock);
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83 return err;
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84 }
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85
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86 /**
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87 Make the PRNG ready to read from
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88 @param prng The PRNG to make active
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89 @return CRYPT_OK if successful
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90 */
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91 int chacha20_prng_ready(prng_state *prng)
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92 {
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93 int err;
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94
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95 LTC_ARGCHK(prng != NULL);
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96
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97 LTC_MUTEX_LOCK(&prng->lock);
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98 if (prng->ready) { err = CRYPT_OK; goto LBL_UNLOCK; }
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99 /* key 32 bytes, 20 rounds */
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100 if ((err = chacha_setup(&prng->chacha.s, prng->chacha.ent, 32, 20)) != CRYPT_OK) goto LBL_UNLOCK;
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101 /* iv 8 bytes */
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102 if ((err = chacha_ivctr64(&prng->chacha.s, prng->chacha.ent + 32, 8, 0)) != CRYPT_OK) goto LBL_UNLOCK;
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103 XMEMSET(&prng->chacha.ent, 0, sizeof(prng->chacha.ent));
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104 prng->chacha.idx = 0;
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105 prng->ready = 1;
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106 LBL_UNLOCK:
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107 LTC_MUTEX_UNLOCK(&prng->lock);
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108 return err;
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109 }
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110
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111 /**
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112 Read from the PRNG
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113 @param out Destination
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114 @param outlen Length of output
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115 @param prng The active PRNG to read from
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116 @return Number of octets read
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117 */
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118 unsigned long chacha20_prng_read(unsigned char *out, unsigned long outlen, prng_state *prng)
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119 {
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120 if (outlen == 0 || prng == NULL || out == NULL) return 0;
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121 LTC_MUTEX_LOCK(&prng->lock);
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122 if (!prng->ready) { outlen = 0; goto LBL_UNLOCK; }
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123 if (chacha_keystream(&prng->chacha.s, out, outlen) != CRYPT_OK) outlen = 0;
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124 LBL_UNLOCK:
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125 LTC_MUTEX_UNLOCK(&prng->lock);
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126 return outlen;
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127 }
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128
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129 /**
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130 Terminate the PRNG
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131 @param prng The PRNG to terminate
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132 @return CRYPT_OK if successful
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133 */
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134 int chacha20_prng_done(prng_state *prng)
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135 {
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136 int err;
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137 LTC_ARGCHK(prng != NULL);
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138 LTC_MUTEX_LOCK(&prng->lock);
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139 prng->ready = 0;
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140 err = chacha_done(&prng->chacha.s);
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141 LTC_MUTEX_UNLOCK(&prng->lock);
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142 LTC_MUTEX_DESTROY(&prng->lock);
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143 return err;
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144 }
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145
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146 /**
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147 Export the PRNG state
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148 @param out [out] Destination
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149 @param outlen [in/out] Max size and resulting size of the state
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150 @param prng The PRNG to export
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151 @return CRYPT_OK if successful
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152 */
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153 int chacha20_prng_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
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154 {
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155 unsigned long len = chacha20_prng_desc.export_size;
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156
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157 LTC_ARGCHK(prng != NULL);
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158 LTC_ARGCHK(out != NULL);
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159 LTC_ARGCHK(outlen != NULL);
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160
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161 if (*outlen < len) {
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162 *outlen = len;
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163 return CRYPT_BUFFER_OVERFLOW;
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164 }
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165
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166 if (chacha20_prng_read(out, len, prng) != len) {
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167 return CRYPT_ERROR_READPRNG;
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168 }
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169
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170 *outlen = len;
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171 return CRYPT_OK;
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172 }
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173
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174 /**
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175 Import a PRNG state
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176 @param in The PRNG state
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177 @param inlen Size of the state
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178 @param prng The PRNG to import
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179 @return CRYPT_OK if successful
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180 */
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181 int chacha20_prng_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
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182 {
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183 int err;
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184
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185 LTC_ARGCHK(prng != NULL);
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186 LTC_ARGCHK(in != NULL);
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187 if (inlen < (unsigned long)chacha20_prng_desc.export_size) return CRYPT_INVALID_ARG;
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188
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189 if ((err = chacha20_prng_start(prng)) != CRYPT_OK) return err;
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190 if ((err = chacha20_prng_add_entropy(in, inlen, prng)) != CRYPT_OK) return err;
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191 return CRYPT_OK;
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192 }
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diff changeset
193
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194 /**
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195 PRNG self-test
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196 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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197 */
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198 int chacha20_prng_test(void)
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199 {
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200 #ifndef LTC_TEST
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201 return CRYPT_NOP;
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202 #else
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203 prng_state st;
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diff changeset
204 unsigned char en[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
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205 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14,
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diff changeset
206 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
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diff changeset
207 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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diff changeset
208 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32 };
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diff changeset
209 unsigned char dmp[300];
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diff changeset
210 unsigned long dmplen = sizeof(dmp);
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diff changeset
211 unsigned char out[500];
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diff changeset
212 unsigned char t1[] = { 0x59, 0xB2, 0x26, 0x95, 0x2B, 0x01, 0x8F, 0x05, 0xBE, 0xD8 };
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diff changeset
213 unsigned char t2[] = { 0x47, 0xC9, 0x0D, 0x03, 0xE4, 0x75, 0x34, 0x27, 0xBD, 0xDE };
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diff changeset
214 unsigned char t3[] = { 0xBC, 0xFA, 0xEF, 0x59, 0x37, 0x7F, 0x1A, 0x91, 0x1A, 0xA6 };
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diff changeset
215 int err;
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diff changeset
216
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diff changeset
217 if ((err = chacha20_prng_start(&st)) != CRYPT_OK) return err;
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diff changeset
218 /* add entropy to uninitialized prng */
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diff changeset
219 if ((err = chacha20_prng_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
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diff changeset
220 if ((err = chacha20_prng_ready(&st)) != CRYPT_OK) return err;
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parents:
diff changeset
221 if (chacha20_prng_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
222 if (compare_testvector(out, 10, t1, sizeof(t1), "CHACHA-PRNG", 1)) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
223 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
224 /* add entropy to already initialized prng */
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diff changeset
225 if ((err = chacha20_prng_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
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diff changeset
226 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
227 if ((err = chacha20_prng_export(dmp, &dmplen, &st)) != CRYPT_OK) return err;
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diff changeset
228 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
229 if (chacha20_prng_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
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diff changeset
230 if (compare_testvector(out, 10, t2, sizeof(t2), "CHACHA-PRNG", 2)) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
231 if ((err = chacha20_prng_done(&st)) != CRYPT_OK) return err;
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diff changeset
232 if ((err = chacha20_prng_import(dmp, dmplen, &st)) != CRYPT_OK) return err;
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diff changeset
233 if ((err = chacha20_prng_ready(&st)) != CRYPT_OK) return err;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
234 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
235 if (chacha20_prng_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
236 if (compare_testvector(out, 10, t3, sizeof(t3), "CHACHA-PRNG", 3)) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
237 if ((err = chacha20_prng_done(&st)) != CRYPT_OK) return err;
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diff changeset
238
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diff changeset
239 return CRYPT_OK;
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diff changeset
240 #endif
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diff changeset
241 }
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diff changeset
242
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diff changeset
243 #endif
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diff changeset
244
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diff changeset
245 /* ref: $Format:%D$ */
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parents:
diff changeset
246 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
247 /* commit time: $Format:%ai$ */