Mercurial > dropbear

annotate src/encauth/eax/eax_init.c @ 195:19e5d79b7190 libtomcrypt

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Cleanup of import of LTC 1.02, still problematic for Dropbear
author Matt Johnston <matt@ucc.asn.au>
date Mon, 09 May 2005 09:33:00 +0000
parents 1c15b283127b
children 39d5d58461d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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2 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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3 * LibTomCrypt is a library that provides various cryptographic
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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4 * algorithms in a highly modular and flexible manner.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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5 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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6 * The library is free for all purposes without any express
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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7 * guarantee it works.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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8 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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10 */
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11
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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12 /**
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13 @file eax_init.c
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14 EAX implementation, initialized EAX state, by Tom St Denis
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15 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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16 #include "tomcrypt.h"
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17
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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18 #ifdef EAX_MODE
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19
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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20 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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21 Initialized an EAX state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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22 @param eax [out] The EAX state to initialize
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23 @param cipher The index of the desired cipher
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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24 @param key The secret key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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25 @param keylen The length of the secret key (octets)
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26 @param nonce The use-once nonce for the session
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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27 @param noncelen The length of the nonce (octets)
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28 @param header The header for the EAX state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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29 @param headerlen The header length (octets)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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30 @return CRYPT_OK if successful
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31 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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32 int eax_init(eax_state *eax, int cipher,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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33 const unsigned char *key, unsigned long keylen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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34 const unsigned char *nonce, unsigned long noncelen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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35 const unsigned char *header, unsigned long headerlen)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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36 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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37 unsigned char *buf;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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38 int err, blklen;
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Matt Johnston <matt@ucc.asn.au>
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39 omac_state *omac;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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40 unsigned long len;
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41
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42
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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43 LTC_ARGCHK(eax != NULL);
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44 LTC_ARGCHK(key != NULL);
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45 LTC_ARGCHK(nonce != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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46 if (headerlen > 0) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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47 LTC_ARGCHK(header != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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48 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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49
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50 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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51 return err;
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52 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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53 blklen = cipher_descriptor[cipher].block_length;
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54
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55 /* allocate ram */
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56 buf = XMALLOC(MAXBLOCKSIZE);
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Matt Johnston <matt@ucc.asn.au>
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57 omac = XMALLOC(sizeof(*omac));
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58
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59 if (buf == NULL || omac == NULL) {
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Matt Johnston <matt@ucc.asn.au>
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60 if (buf != NULL) {
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61 XFREE(buf);
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62 }
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63 if (omac != NULL) {
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64 XFREE(omac);
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65 }
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66 return CRYPT_MEM;
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67 }
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68
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69 /* N = OMAC_0K(nonce) */
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70 zeromem(buf, MAXBLOCKSIZE);
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71 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
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72 goto LBL_ERR;
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73 }
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74
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75 /* omac the [0]_n */
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76 if ((err = omac_process(omac, buf, blklen)) != CRYPT_OK) {
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77 goto LBL_ERR;
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78 }
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79 /* omac the nonce */
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80 if ((err = omac_process(omac, nonce, noncelen)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83 /* store result */
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84 len = sizeof(eax->N);
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85 if ((err = omac_done(omac, eax->N, &len)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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86 goto LBL_ERR;
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Matt Johnston <matt@ucc.asn.au>
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87 }
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88
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89 /* H = OMAC_1K(header) */
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90 zeromem(buf, MAXBLOCKSIZE);
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91 buf[blklen - 1] = 1;
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92
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93 if ((err = omac_init(&eax->headeromac, cipher, key, keylen)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
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94 goto LBL_ERR;
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95 }
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96
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97 /* omac the [1]_n */
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98 if ((err = omac_process(&eax->headeromac, buf, blklen)) != CRYPT_OK) {
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99 goto LBL_ERR;
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100 }
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101 /* omac the header */
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102 if (headerlen != 0) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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103 if ((err = omac_process(&eax->headeromac, header, headerlen)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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104 goto LBL_ERR;
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105 }
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106 }
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107
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108 /* note we don't finish the headeromac, this allows us to add more header later */
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109
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110 /* setup the CTR mode */
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111 if ((err = ctr_start(cipher, eax->N, key, keylen, 0, &eax->ctr)) != CRYPT_OK) {
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112 goto LBL_ERR;
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113 }
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114 /* use big-endian counter */
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115 eax->ctr.mode = 1;
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116
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117 /* setup the OMAC for the ciphertext */
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118 if ((err = omac_init(&eax->ctomac, cipher, key, keylen)) != CRYPT_OK) {
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119 goto LBL_ERR;
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120 }
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121
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122 /* omac [2]_n */
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123 zeromem(buf, MAXBLOCKSIZE);
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124 buf[blklen-1] = 2;
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125 if ((err = omac_process(&eax->ctomac, buf, blklen)) != CRYPT_OK) {
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126 goto LBL_ERR;
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127 }
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128
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129 err = CRYPT_OK;
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130 LBL_ERR:
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131 #ifdef LTC_CLEAN_STACK
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132 zeromem(buf, MAXBLOCKSIZE);
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133 zeromem(omac, sizeof(*omac));
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134 #endif
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135
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136 XFREE(omac);
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137 XFREE(buf);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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138
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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139 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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140 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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141
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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142 #endif