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annotate src/encauth/ocb/ocb_init.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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
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12 /**
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13 @file ocb_init.c
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14 OCB implementation, initialize state, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef OCB_MODE
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19
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20 static const struct {
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21 int len;
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22 unsigned char poly_div[MAXBLOCKSIZE],
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23 poly_mul[MAXBLOCKSIZE];
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24 } polys[] = {
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25 {
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26 8,
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27 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D },
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28 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B }
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29 }, {
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30 16,
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31 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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32 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 },
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33 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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34 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 }
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35 }
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36 };
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37
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38 /**
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39 Initialize an OCB context.
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40 @param ocb [out] The destination of the OCB state
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41 @param cipher The index of the desired cipher
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42 @param key The secret key
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43 @param keylen The length of the secret key (octets)
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44 @param nonce The session nonce (length of the block size of the cipher)
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45 @return CRYPT_OK if successful
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46 */
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47 int ocb_init(ocb_state *ocb, int cipher,
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48 const unsigned char *key, unsigned long keylen, const unsigned char *nonce)
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49 {
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50 int poly, x, y, m, err;
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51
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52 LTC_ARGCHK(ocb != NULL);
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53 LTC_ARGCHK(key != NULL);
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54 LTC_ARGCHK(nonce != NULL);
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55
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56 /* valid cipher? */
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57 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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58 return err;
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59 }
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60
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61 /* determine which polys to use */
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62 ocb->block_len = cipher_descriptor[cipher].block_length;
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63 for (poly = 0; poly < (int)(sizeof(polys)/sizeof(polys[0])); poly++) {
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64 if (polys[poly].len == ocb->block_len) {
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65 break;
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66 }
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67 }
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68 if (polys[poly].len != ocb->block_len) {
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69 return CRYPT_INVALID_ARG;
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70 }
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71
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72 /* schedule the key */
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73 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ocb->key)) != CRYPT_OK) {
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74 return err;
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75 }
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76
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77 /* find L = E[0] */
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78 zeromem(ocb->L, ocb->block_len);
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79 cipher_descriptor[cipher].ecb_encrypt(ocb->L, ocb->L, &ocb->key);
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80
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81 /* find R = E[N xor L] */
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82 for (x = 0; x < ocb->block_len; x++) {
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83 ocb->R[x] = ocb->L[x] ^ nonce[x];
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84 }
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85 cipher_descriptor[cipher].ecb_encrypt(ocb->R, ocb->R, &ocb->key);
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86
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87 /* find Ls[i] = L << i for i == 0..31 */
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88 XMEMCPY(ocb->Ls[0], ocb->L, ocb->block_len);
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89 for (x = 1; x < 32; x++) {
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90 m = ocb->Ls[x-1][0] >> 7;
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91 for (y = 0; y < ocb->block_len-1; y++) {
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92 ocb->Ls[x][y] = ((ocb->Ls[x-1][y] << 1) | (ocb->Ls[x-1][y+1] >> 7)) & 255;
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93 }
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94 ocb->Ls[x][ocb->block_len-1] = (ocb->Ls[x-1][ocb->block_len-1] << 1) & 255;
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95
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96 if (m == 1) {
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97 for (y = 0; y < ocb->block_len; y++) {
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98 ocb->Ls[x][y] ^= polys[poly].poly_mul[y];
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99 }
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100 }
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101 }
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102
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103 /* find Lr = L / x */
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104 m = ocb->L[ocb->block_len-1] & 1;
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105
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106 /* shift right */
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107 for (x = ocb->block_len - 1; x > 0; x--) {
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108 ocb->Lr[x] = ((ocb->L[x] >> 1) | (ocb->L[x-1] << 7)) & 255;
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109 }
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110 ocb->Lr[0] = ocb->L[0] >> 1;
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111
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112 if (m == 1) {
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113 for (x = 0; x < ocb->block_len; x++) {
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114 ocb->Lr[x] ^= polys[poly].poly_div[x];
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115 }
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116 }
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117
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118 /* set Li, checksum */
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119 zeromem(ocb->Li, ocb->block_len);
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120 zeromem(ocb->checksum, ocb->block_len);
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121
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122 /* set other params */
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123 ocb->block_index = 1;
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124 ocb->cipher = cipher;
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125
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126 return CRYPT_OK;
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127 }
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128
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129 #endif