Mercurial > dropbear

annotate src/encauth/ocb/s_ocb_done.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
Matt Johnston <matt@ucc.asn.au>
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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 s_ocb_done.c
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14 OCB implementation, internal helper, 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 /* Since the last block is encrypted in CTR mode the same code can
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21 * be used to finish a decrypt or encrypt stream. The only difference
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22 * is we XOR the final ciphertext into the checksum so we have to xor it
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23 * before we CTR [decrypt] or after [encrypt]
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24 *
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25 * the names pt/ptlen/ct really just mean in/inlen/out but this is the way I wrote it...
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26 */
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27
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28 /**
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29 Shared code to finish an OCB stream
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30 @param ocb The OCB state
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31 @param pt The remaining plaintext [or input]
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32 @param ptlen The length of the input (octets)
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33 @param ct [out] The output buffer
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34 @param tag [out] The destination for the authentication tag
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35 @param taglen [in/out] The max size and resulting size of the authentication tag
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36 @param mode The mode we are terminating, 0==encrypt, 1==decrypt
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37 @return CRYPT_OK if successful
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38 */
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39 int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen,
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40 unsigned char *ct, unsigned char *tag, unsigned long *taglen, int mode)
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41
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42 {
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43 unsigned char *Z, *Y, *X;
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44 int err, x;
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45
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46 LTC_ARGCHK(ocb != NULL);
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47 LTC_ARGCHK(pt != NULL);
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48 LTC_ARGCHK(ct != NULL);
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49 LTC_ARGCHK(tag != NULL);
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50 LTC_ARGCHK(taglen != NULL);
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51 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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52 return err;
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53 }
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54 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length ||
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55 (int)ptlen > ocb->block_len || (int)ptlen < 0) {
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56 return CRYPT_INVALID_ARG;
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57 }
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58
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59 /* allocate ram */
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60 Z = XMALLOC(MAXBLOCKSIZE);
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61 Y = XMALLOC(MAXBLOCKSIZE);
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62 X = XMALLOC(MAXBLOCKSIZE);
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63 if (X == NULL || Y == NULL || Z == NULL) {
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64 if (X != NULL) {
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65 XFREE(X);
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66 }
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67 if (Y != NULL) {
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68 XFREE(Y);
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69 }
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70 if (Z != NULL) {
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71 XFREE(Z);
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72 }
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73 return CRYPT_MEM;
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74 }
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75
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76 /* compute X[m] = len(pt[m]) XOR Lr XOR Z[m] */
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77 ocb_shift_xor(ocb, X);
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78 XMEMCPY(Z, X, ocb->block_len);
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79
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80 X[ocb->block_len-1] ^= (ptlen*8)&255;
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81 X[ocb->block_len-2] ^= ((ptlen*8)>>8)&255;
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82 for (x = 0; x < ocb->block_len; x++) {
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83 X[x] ^= ocb->Lr[x];
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84 }
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85
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86 /* Y[m] = E(X[m])) */
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87 cipher_descriptor[ocb->cipher].ecb_encrypt(X, Y, &ocb->key);
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88
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89 if (mode == 1) {
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90 /* decrypt mode, so let's xor it first */
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91 /* xor C[m] into checksum */
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92 for (x = 0; x < (int)ptlen; x++) {
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93 ocb->checksum[x] ^= ct[x];
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94 }
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95 }
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96
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97 /* C[m] = P[m] xor Y[m] */
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98 for (x = 0; x < (int)ptlen; x++) {
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99 ct[x] = pt[x] ^ Y[x];
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100 }
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101
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102 if (mode == 0) {
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103 /* encrypt mode */
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104 /* xor C[m] into checksum */
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105 for (x = 0; x < (int)ptlen; x++) {
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106 ocb->checksum[x] ^= ct[x];
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107 }
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108 }
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109
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110 /* xor Y[m] and Z[m] into checksum */
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111 for (x = 0; x < ocb->block_len; x++) {
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112 ocb->checksum[x] ^= Y[x] ^ Z[x];
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113 }
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114
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115 /* encrypt checksum, er... tag!! */
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116 cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->checksum, X, &ocb->key);
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117 cipher_descriptor[ocb->cipher].done(&ocb->key);
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118
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119 /* now store it */
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120 for (x = 0; x < ocb->block_len && x < (int)*taglen; x++) {
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121 tag[x] = X[x];
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122 }
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123 *taglen = x;
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124
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125 #ifdef LTC_CLEAN_STACK
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126 zeromem(X, MAXBLOCKSIZE);
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127 zeromem(Y, MAXBLOCKSIZE);
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128 zeromem(Z, MAXBLOCKSIZE);
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129 zeromem(ocb, sizeof(*ocb));
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130 #endif
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131
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132 XFREE(X);
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133 XFREE(Y);
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134 XFREE(Z);
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135
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136 return CRYPT_OK;
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137 }
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138
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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139 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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140