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annotate libtomcrypt/src/encauth/ocb3/ocb3_init.c @ 1792:2bf1e97ba3cd

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Update INSTALL (#113) Make Git/Mercurial instructions easier to understand
author Xenhat <commits@xenh.at>
date Thu, 17 Dec 2020 04:35:48 -0500
parents 6dba84798cd5
children
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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: $Format:%ai$ */