Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb3/ocb3_init.c @ 1715:3974f087d9c0

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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>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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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 /**
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11 @file ocb3_init.c
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12 OCB implementation, initialize state, by Tom St Denis
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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_OCB3_MODE
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17
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18 static void _ocb3_int_calc_offset_zero(ocb3_state *ocb, const unsigned char *nonce, unsigned long noncelen, unsigned long taglen)
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19 {
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20 int x, y, bottom;
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21 int idx, shift;
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22 unsigned char iNonce[MAXBLOCKSIZE];
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23 unsigned char iKtop[MAXBLOCKSIZE];
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24 unsigned char iStretch[MAXBLOCKSIZE+8];
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25
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26 /* Nonce = zeros(127-bitlen(N)) || 1 || N */
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27 zeromem(iNonce, sizeof(iNonce));
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28 for (x = ocb->block_len-1, y=0; y<(int)noncelen; x--, y++) {
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29 iNonce[x] = nonce[noncelen-y-1];
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30 }
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31 iNonce[x] = 0x01;
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32 iNonce[0] |= ((taglen*8) % 128) << 1;
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33
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34 /* bottom = str2num(Nonce[123..128]) */
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35 bottom = iNonce[ocb->block_len-1] & 0x3F;
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36
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37 /* Ktop = ENCIPHER(K, Nonce[1..122] || zeros(6)) */
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38 iNonce[ocb->block_len-1] = iNonce[ocb->block_len-1] & 0xC0;
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39 if ((cipher_descriptor[ocb->cipher].ecb_encrypt(iNonce, iKtop, &ocb->key)) != CRYPT_OK) {
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40 zeromem(ocb->Offset_current, ocb->block_len);
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41 return;
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42 }
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43
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44 /* Stretch = Ktop || (Ktop[1..64] xor Ktop[9..72]) */
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45 for (x = 0; x < ocb->block_len; x++) {
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46 iStretch[x] = iKtop[x];
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47 }
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48 for (y = 0; y < 8; y++) {
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49 iStretch[x+y] = iKtop[y] ^ iKtop[y+1];
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50 }
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51
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52 /* Offset_0 = Stretch[1+bottom..128+bottom] */
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53 idx = bottom / 8;
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54 shift = (bottom % 8);
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55 for (x = 0; x < ocb->block_len; x++) {
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56 ocb->Offset_current[x] = iStretch[idx+x] << shift;
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57 if (shift > 0) {
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58 ocb->Offset_current[x] |= iStretch[idx+x+1] >> (8-shift);
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59 }
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60 }
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61 }
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62
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63 static const struct {
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64 int len;
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65 unsigned char poly_mul[MAXBLOCKSIZE];
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66 } polys[] = {
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67 {
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68 8,
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69 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B }
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70 }, {
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71 16,
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72 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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73 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 }
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74 }
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75 };
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76
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77 /**
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78 Initialize an OCB context
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79 @param ocb [out] The destination of the OCB state
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80 @param cipher The index of the desired cipher
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81 @param key The secret key
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82 @param keylen The length of the secret key (octets)
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83 @param nonce The session nonce
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84 @param noncelen The length of the session nonce (octets, up to 15)
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85 @param taglen The length of the tag (octets, up to 16)
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86 @return CRYPT_OK if successful
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87 */
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88 int ocb3_init(ocb3_state *ocb, int cipher,
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89 const unsigned char *key, unsigned long keylen,
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90 const unsigned char *nonce, unsigned long noncelen,
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91 unsigned long taglen)
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92 {
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93 int poly, x, y, m, err;
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94 unsigned char *previous, *current;
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95
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96 LTC_ARGCHK(ocb != NULL);
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97 LTC_ARGCHK(key != NULL);
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98 LTC_ARGCHK(nonce != NULL);
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99
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100 /* valid cipher? */
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101 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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102 return err;
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103 }
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104 ocb->cipher = cipher;
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105
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106 /* Valid Nonce?
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107 * As of RFC7253: "string of no more than 120 bits" */
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108 if (noncelen > (120/8)) {
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109 return CRYPT_INVALID_ARG;
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110 }
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111
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112 /* The blockcipher must have a 128-bit blocksize */
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113 if (cipher_descriptor[cipher].block_length != 16) {
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114 return CRYPT_INVALID_ARG;
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115 }
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116
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117 /* The TAGLEN may be any value up to 128 (bits) */
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118 if (taglen > 16) {
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119 return CRYPT_INVALID_ARG;
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120 }
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121 ocb->tag_len = taglen;
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122
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123 /* determine which polys to use */
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124 ocb->block_len = cipher_descriptor[cipher].block_length;
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125 x = (int)(sizeof(polys)/sizeof(polys[0]));
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126 for (poly = 0; poly < x; poly++) {
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127 if (polys[poly].len == ocb->block_len) {
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128 break;
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129 }
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130 }
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131 if (poly == x) {
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132 return CRYPT_INVALID_ARG; /* block_len not found in polys */
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133 }
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134 if (polys[poly].len != ocb->block_len) {
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135 return CRYPT_INVALID_ARG;
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136 }
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137
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138 /* schedule the key */
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139 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ocb->key)) != CRYPT_OK) {
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140 return err;
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141 }
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142
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143 /* L_* = ENCIPHER(K, zeros(128)) */
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144 zeromem(ocb->L_star, ocb->block_len);
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145 if ((err = cipher_descriptor[cipher].ecb_encrypt(ocb->L_star, ocb->L_star, &ocb->key)) != CRYPT_OK) {
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146 return err;
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147 }
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148
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149 /* compute L_$, L_0, L_1, ... */
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150 for (x = -1; x < 32; x++) {
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151 if (x == -1) { /* gonna compute: L_$ = double(L_*) */
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152 current = ocb->L_dollar;
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153 previous = ocb->L_star;
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154 }
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155 else if (x == 0) { /* gonna compute: L_0 = double(L_$) */
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156 current = ocb->L_[0];
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157 previous = ocb->L_dollar;
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158 }
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159 else { /* gonna compute: L_i = double(L_{i-1}) for every integer i > 0 */
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160 current = ocb->L_[x];
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161 previous = ocb->L_[x-1];
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162 }
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163 m = previous[0] >> 7;
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164 for (y = 0; y < ocb->block_len-1; y++) {
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165 current[y] = ((previous[y] << 1) | (previous[y+1] >> 7)) & 255;
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166 }
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167 current[ocb->block_len-1] = (previous[ocb->block_len-1] << 1) & 255;
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168 if (m == 1) {
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169 /* current[] = current[] XOR polys[poly].poly_mul[]*/
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170 ocb3_int_xor_blocks(current, current, polys[poly].poly_mul, ocb->block_len);
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171 }
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172 }
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173
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174 /* initialize ocb->Offset_current = Offset_0 */
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175 _ocb3_int_calc_offset_zero(ocb, nonce, noncelen, taglen);
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176
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177 /* initialize checksum to all zeros */
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178 zeromem(ocb->checksum, ocb->block_len);
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179
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180 /* set block index */
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181 ocb->block_index = 1;
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182
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183 /* initialize AAD related stuff */
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184 ocb->ablock_index = 1;
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185 ocb->adata_buffer_bytes = 0;
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186 zeromem(ocb->aOffset_current, ocb->block_len);
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187 zeromem(ocb->aSum_current, ocb->block_len);
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188
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189 return CRYPT_OK;
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190 }
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191
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192 #endif
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193
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194 /* ref: $Format:%D$ */
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195 /* git commit: $Format:%H$ */
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196 /* commit time: $Format:%ai$ */