Mercurial > dropbear
annotate libtomcrypt/src/ciphers/noekeon.c @ 1715:3974f087d9c0
Disallow leading lines before the ident for server (#102)
Per RFC4253 4.2 clients must be able to process other lines of data
before the version string, server behavior is not defined neither
with MUST/SHOULD nor with MAY.
If server process up to 50 lines too - it may cause too long hanging
session with invalid/evil client that consume host resources and
potentially may lead to DDoS on poor embedded boxes.
Let's require first line from client to be version string and fail
early if it's not - matches both RFC and real OpenSSH behavior.
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
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date | Mon, 15 Jun 2020 18:22:18 +0500 |
parents | 6dba84798cd5 |
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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 /** |
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10 @file noekeon.c |
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11 Implementation of the Noekeon block cipher by Tom St Denis |
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12 */ |
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13 #include "tomcrypt.h" |
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14 |
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15 #ifdef LTC_NOEKEON |
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16 |
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17 const struct ltc_cipher_descriptor noekeon_desc = |
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18 { |
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19 "noekeon", |
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20 16, |
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21 16, 16, 16, 16, |
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22 &noekeon_setup, |
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23 &noekeon_ecb_encrypt, |
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24 &noekeon_ecb_decrypt, |
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25 &noekeon_test, |
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26 &noekeon_done, |
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27 &noekeon_keysize, |
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28 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL |
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29 }; |
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30 |
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31 static const ulong32 RC[] = { |
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32 0x00000080UL, 0x0000001bUL, 0x00000036UL, 0x0000006cUL, |
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33 0x000000d8UL, 0x000000abUL, 0x0000004dUL, 0x0000009aUL, |
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34 0x0000002fUL, 0x0000005eUL, 0x000000bcUL, 0x00000063UL, |
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35 0x000000c6UL, 0x00000097UL, 0x00000035UL, 0x0000006aUL, |
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36 0x000000d4UL |
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37 }; |
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38 |
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39 #define kTHETA(a, b, c, d) \ |
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40 temp = a^c; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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41 b ^= temp; d ^= temp; \ |
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42 temp = b^d; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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43 a ^= temp; c ^= temp; |
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44 |
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45 #define THETA(k, a, b, c, d) \ |
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46 temp = a^c; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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47 b ^= temp ^ k[1]; d ^= temp ^ k[3]; \ |
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48 temp = b^d; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \ |
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49 a ^= temp ^ k[0]; c ^= temp ^ k[2]; |
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50 |
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51 #define GAMMA(a, b, c, d) \ |
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52 b ^= ~(d|c); \ |
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53 a ^= c&b; \ |
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54 temp = d; d = a; a = temp;\ |
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55 c ^= a ^ b ^ d; \ |
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56 b ^= ~(d|c); \ |
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57 a ^= c&b; |
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58 |
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59 #define PI1(a, b, c, d) \ |
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60 b = ROLc(b, 1); c = ROLc(c, 5); d = ROLc(d, 2); |
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61 |
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62 #define PI2(a, b, c, d) \ |
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63 b = RORc(b, 1); c = RORc(c, 5); d = RORc(d, 2); |
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64 |
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65 /** |
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66 Initialize the Noekeon block cipher |
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67 @param key The symmetric key you wish to pass |
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68 @param keylen The key length in bytes |
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69 @param num_rounds The number of rounds desired (0 for default) |
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70 @param skey The key in as scheduled by this function. |
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71 @return CRYPT_OK if successful |
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72 */ |
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73 int noekeon_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey) |
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74 { |
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75 ulong32 temp; |
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76 |
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77 LTC_ARGCHK(key != NULL); |
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78 LTC_ARGCHK(skey != NULL); |
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79 |
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80 if (keylen != 16) { |
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81 return CRYPT_INVALID_KEYSIZE; |
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82 } |
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83 |
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84 if (num_rounds != 16 && num_rounds != 0) { |
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85 return CRYPT_INVALID_ROUNDS; |
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86 } |
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87 |
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88 LOAD32H(skey->noekeon.K[0],&key[0]); |
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89 LOAD32H(skey->noekeon.K[1],&key[4]); |
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90 LOAD32H(skey->noekeon.K[2],&key[8]); |
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91 LOAD32H(skey->noekeon.K[3],&key[12]); |
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92 |
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93 LOAD32H(skey->noekeon.dK[0],&key[0]); |
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94 LOAD32H(skey->noekeon.dK[1],&key[4]); |
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95 LOAD32H(skey->noekeon.dK[2],&key[8]); |
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96 LOAD32H(skey->noekeon.dK[3],&key[12]); |
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97 |
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98 kTHETA(skey->noekeon.dK[0], skey->noekeon.dK[1], skey->noekeon.dK[2], skey->noekeon.dK[3]); |
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99 |
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100 return CRYPT_OK; |
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101 } |
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102 |
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103 /** |
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104 Encrypts a block of text with Noekeon |
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105 @param pt The input plaintext (16 bytes) |
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106 @param ct The output ciphertext (16 bytes) |
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107 @param skey The key as scheduled |
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108 @return CRYPT_OK if successful |
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109 */ |
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110 #ifdef LTC_CLEAN_STACK |
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111 static int _noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
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112 #else |
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113 int noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
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114 #endif |
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115 { |
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116 ulong32 a,b,c,d,temp; |
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117 int r; |
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118 |
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119 LTC_ARGCHK(skey != NULL); |
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120 LTC_ARGCHK(pt != NULL); |
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121 LTC_ARGCHK(ct != NULL); |
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122 |
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123 LOAD32H(a,&pt[0]); LOAD32H(b,&pt[4]); |
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124 LOAD32H(c,&pt[8]); LOAD32H(d,&pt[12]); |
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125 |
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126 #define ROUND(i) \ |
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127 a ^= RC[i]; \ |
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128 THETA(skey->noekeon.K, a,b,c,d); \ |
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129 PI1(a,b,c,d); \ |
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130 GAMMA(a,b,c,d); \ |
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131 PI2(a,b,c,d); |
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132 |
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133 for (r = 0; r < 16; ++r) { |
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134 ROUND(r); |
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135 } |
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136 |
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137 #undef ROUND |
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138 |
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139 a ^= RC[16]; |
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140 THETA(skey->noekeon.K, a, b, c, d); |
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141 |
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142 STORE32H(a,&ct[0]); STORE32H(b,&ct[4]); |
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143 STORE32H(c,&ct[8]); STORE32H(d,&ct[12]); |
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144 |
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145 return CRYPT_OK; |
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146 } |
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147 |
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148 #ifdef LTC_CLEAN_STACK |
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149 int noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) |
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150 { |
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151 int err = _noekeon_ecb_encrypt(pt, ct, skey); |
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152 burn_stack(sizeof(ulong32) * 5 + sizeof(int)); |
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153 return err; |
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154 } |
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155 #endif |
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156 |
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157 /** |
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158 Decrypts a block of text with Noekeon |
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159 @param ct The input ciphertext (16 bytes) |
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160 @param pt The output plaintext (16 bytes) |
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161 @param skey The key as scheduled |
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162 @return CRYPT_OK if successful |
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163 */ |
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164 #ifdef LTC_CLEAN_STACK |
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165 static int _noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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166 #else |
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167 int noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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168 #endif |
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169 { |
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170 ulong32 a,b,c,d, temp; |
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171 int r; |
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172 |
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173 LTC_ARGCHK(skey != NULL); |
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174 LTC_ARGCHK(pt != NULL); |
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175 LTC_ARGCHK(ct != NULL); |
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176 |
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177 LOAD32H(a,&ct[0]); LOAD32H(b,&ct[4]); |
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178 LOAD32H(c,&ct[8]); LOAD32H(d,&ct[12]); |
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179 |
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180 |
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181 #define ROUND(i) \ |
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182 THETA(skey->noekeon.dK, a,b,c,d); \ |
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183 a ^= RC[i]; \ |
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184 PI1(a,b,c,d); \ |
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185 GAMMA(a,b,c,d); \ |
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186 PI2(a,b,c,d); |
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187 |
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188 for (r = 16; r > 0; --r) { |
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189 ROUND(r); |
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190 } |
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191 |
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192 #undef ROUND |
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193 |
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194 THETA(skey->noekeon.dK, a,b,c,d); |
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195 a ^= RC[0]; |
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196 STORE32H(a,&pt[0]); STORE32H(b, &pt[4]); |
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197 STORE32H(c,&pt[8]); STORE32H(d, &pt[12]); |
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198 return CRYPT_OK; |
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199 } |
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200 |
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201 #ifdef LTC_CLEAN_STACK |
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202 int noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) |
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203 { |
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204 int err = _noekeon_ecb_decrypt(ct, pt, skey); |
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205 burn_stack(sizeof(ulong32) * 5 + sizeof(int)); |
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206 return err; |
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207 } |
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208 #endif |
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209 |
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210 /** |
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211 Performs a self-test of the Noekeon block cipher |
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212 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled |
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213 */ |
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214 int noekeon_test(void) |
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215 { |
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216 #ifndef LTC_TEST |
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217 return CRYPT_NOP; |
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218 #else |
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219 static const struct { |
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220 int keylen; |
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221 unsigned char key[16], pt[16], ct[16]; |
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222 } tests[] = { |
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223 { |
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224 16, |
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225 { 0xAA, 0x3C, 0x8C, 0x86, 0xD9, 0x8B, 0xF8, 0xBE, 0x21, 0xE0, 0x36, 0x09, 0x78, 0xFB, 0xE4, 0x90 }, |
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226 { 0xE4, 0x96, 0x6C, 0xD3, 0x13, 0xA0, 0x6C, 0xAF, 0xD0, 0x23, 0xC9, 0xFD, 0x45, 0x32, 0x23, 0x16 }, |
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227 { 0xA6, 0xEC, 0xB8, 0xA8, 0x61, 0xFD, 0x62, 0xD9, 0x13, 0x02, 0xFE, 0x9E, 0x47, 0x01, 0x3F, 0xC3 } |
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228 }, |
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229 { |
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230 16, |
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231 { 0xED, 0x43, 0xD1, 0x87, 0x21, 0x7E, 0xE0, 0x97, 0x3D, 0x76, 0xC3, 0x37, 0x2E, 0x7D, 0xAE, 0xD3 }, |
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232 { 0xE3, 0x38, 0x32, 0xCC, 0xF2, 0x2F, 0x2F, 0x0A, 0x4A, 0x8B, 0x8F, 0x18, 0x12, 0x20, 0x17, 0xD3 }, |
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233 { 0x94, 0xA5, 0xDF, 0xF5, 0xAE, 0x1C, 0xBB, 0x22, 0xAD, 0xEB, 0xA7, 0x0D, 0xB7, 0x82, 0x90, 0xA0 } |
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234 }, |
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235 { |
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236 16, |
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237 { 0x6F, 0xDC, 0x23, 0x38, 0xF2, 0x10, 0xFB, 0xD3, 0xC1, 0x8C, 0x02, 0xF6, 0xB4, 0x6A, 0xD5, 0xA8 }, |
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238 { 0xDB, 0x29, 0xED, 0xB5, 0x5F, 0xB3, 0x60, 0x3A, 0x92, 0xA8, 0xEB, 0x9C, 0x6D, 0x9D, 0x3E, 0x8F }, |
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239 { 0x78, 0xF3, 0x6F, 0xF8, 0x9E, 0xBB, 0x8C, 0x6A, 0xE8, 0x10, 0xF7, 0x00, 0x22, 0x15, 0x30, 0x3D } |
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240 }, |
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241 { |
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242 16, |
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243 { 0x2C, 0x0C, 0x02, 0xEF, 0x6B, 0xC4, 0xF2, 0x0B, 0x2E, 0xB9, 0xE0, 0xBF, 0xD9, 0x36, 0xC2, 0x4E }, |
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244 { 0x84, 0xE2, 0xFE, 0x64, 0xB1, 0xB9, 0xFE, 0x76, 0xA8, 0x3F, 0x45, 0xC7, 0x40, 0x7A, 0xAF, 0xEE }, |
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245 { 0x2A, 0x08, 0xD6, 0xA2, 0x1C, 0x63, 0x08, 0xB0, 0xF8, 0xBC, 0xB3, 0xA1, 0x66, 0xF7, 0xAE, 0xCF } |
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246 }, |
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247 { |
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248 16, |
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249 { 0x6F, 0x30, 0xF8, 0x9F, 0xDA, 0x6E, 0xA0, 0x91, 0x04, 0x0F, 0x6C, 0x8B, 0x7D, 0xF7, 0x2A, 0x4B }, |
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250 { 0x65, 0xB6, 0xA6, 0xD0, 0x42, 0x14, 0x08, 0x60, 0x34, 0x8D, 0x37, 0x2F, 0x01, 0xF0, 0x46, 0xBE }, |
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251 { 0x66, 0xAC, 0x0B, 0x62, 0x1D, 0x68, 0x11, 0xF5, 0x27, 0xB1, 0x13, 0x5D, 0xF3, 0x2A, 0xE9, 0x18 } |
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252 }, |
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253 { |
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254 16, |
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255 { 0xCA, 0xA4, 0x16, 0xB7, 0x1C, 0x92, 0x2E, 0xAD, 0xEB, 0xA7, 0xDB, 0x69, 0x92, 0xCB, 0x35, 0xEF }, |
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256 { 0x81, 0x6F, 0x8E, 0x4D, 0x96, 0xC6, 0xB3, 0x67, 0x83, 0xF5, 0x63, 0xC7, 0x20, 0x6D, 0x40, 0x23 }, |
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257 { 0x44, 0xF7, 0x63, 0x62, 0xF0, 0x43, 0xBB, 0x67, 0x4A, 0x75, 0x12, 0x42, 0x46, 0x29, 0x28, 0x19 } |
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258 }, |
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259 { |
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260 16, |
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261 { 0x6B, 0xCF, 0x22, 0x2F, 0xE0, 0x1B, 0xB0, 0xAA, 0xD8, 0x3C, 0x91, 0x99, 0x18, 0xB2, 0x28, 0xE8 }, |
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262 { 0x7C, 0x37, 0xC7, 0xD0, 0xAC, 0x92, 0x29, 0xF1, 0x60, 0x82, 0x93, 0x89, 0xAA, 0x61, 0xAA, 0xA9 }, |
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263 { 0xE5, 0x89, 0x1B, 0xB3, 0xFE, 0x8B, 0x0C, 0xA1, 0xA6, 0xC7, 0xBE, 0x12, 0x73, 0x0F, 0xC1, 0x19 } |
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264 }, |
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265 { |
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266 16, |
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267 { 0xE6, 0xD0, 0xF1, 0x03, 0x2E, 0xDE, 0x70, 0x8D, 0xD8, 0x9E, 0x36, 0x5C, 0x05, 0x52, 0xE7, 0x0D }, |
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268 { 0xE2, 0x42, 0xE7, 0x92, 0x0E, 0xF7, 0x82, 0xA2, 0xB8, 0x21, 0x8D, 0x26, 0xBA, 0x2D, 0xE6, 0x32 }, |
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269 { 0x1E, 0xDD, 0x75, 0x22, 0xB9, 0x36, 0x8A, 0x0F, 0x32, 0xFD, 0xD4, 0x48, 0x65, 0x12, 0x5A, 0x2F } |
285
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270 } |
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271 }; |
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272 symmetric_key key; |
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273 unsigned char tmp[2][16]; |
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274 int err, i, y; |
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275 |
285
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276 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
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277 zeromem(&key, sizeof(key)); |
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278 if ((err = noekeon_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) { |
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279 return err; |
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280 } |
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281 |
285
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282 noekeon_ecb_encrypt(tests[i].pt, tmp[0], &key); |
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283 noekeon_ecb_decrypt(tmp[0], tmp[1], &key); |
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284 if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "Noekeon Encrypt", i) || |
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285 compare_testvector(tmp[1], 16, tests[i].pt, 16, "Noekeon Decrypt", i)) { |
285
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286 return CRYPT_FAIL_TESTVECTOR; |
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287 } |
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288 |
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289 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */ |
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290 for (y = 0; y < 16; y++) tmp[0][y] = 0; |
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291 for (y = 0; y < 1000; y++) noekeon_ecb_encrypt(tmp[0], tmp[0], &key); |
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292 for (y = 0; y < 1000; y++) noekeon_ecb_decrypt(tmp[0], tmp[0], &key); |
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293 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR; |
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294 } |
285
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295 return CRYPT_OK; |
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296 #endif |
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297 } |
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298 |
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299 /** Terminate the context |
285
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300 @param skey The scheduled key |
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301 */ |
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302 void noekeon_done(symmetric_key *skey) |
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303 { |
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304 LTC_UNUSED_PARAM(skey); |
285
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305 } |
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306 |
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307 /** |
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308 Gets suitable key size |
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309 @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable. |
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310 @return CRYPT_OK if the input key size is acceptable. |
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311 */ |
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312 int noekeon_keysize(int *keysize) |
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313 { |
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314 LTC_ARGCHK(keysize != NULL); |
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315 if (*keysize < 16) { |
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316 return CRYPT_INVALID_KEYSIZE; |
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317 } else { |
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318 *keysize = 16; |
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319 return CRYPT_OK; |
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320 } |
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321 } |
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322 |
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323 #endif |
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324 |
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325 |
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326 /* ref: $Format:%D$ */ |
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327 /* git commit: $Format:%H$ */ |
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328 /* commit time: $Format:%ai$ */ |