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annotate libtomcrypt/src/modes/xts/xts_decrypt.c @ 1435:f849a5ca2efc

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update to libtomcrypt 1.17 (with Dropbear changes)
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 17:50:50 +0800
parents
children 6dba84798cd5
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1435
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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://libtom.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
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15 */
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16
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17 #ifdef LTC_XTS_MODE
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18
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19 static int tweak_uncrypt(const unsigned char *C, unsigned char *P, unsigned char *T, symmetric_xts *xts)
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20 {
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21 unsigned long x;
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22 int err;
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23
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24 /* tweak encrypt block i */
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25 #ifdef LTC_FAST
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26 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
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27 *((LTC_FAST_TYPE*)&P[x]) = *((LTC_FAST_TYPE*)&C[x]) ^ *((LTC_FAST_TYPE*)&T[x]);
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28 }
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29 #else
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30 for (x = 0; x < 16; x++) {
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31 P[x] = C[x] ^ T[x];
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32 }
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33 #endif
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34
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35 err = cipher_descriptor[xts->cipher].ecb_decrypt(P, P, &xts->key1);
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36
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37 #ifdef LTC_FAST
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38 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
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39 *((LTC_FAST_TYPE*)&P[x]) ^= *((LTC_FAST_TYPE*)&T[x]);
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40 }
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41 #else
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42 for (x = 0; x < 16; x++) {
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43 P[x] = P[x] ^ T[x];
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44 }
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45 #endif
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46
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47 /* LFSR the tweak */
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48 xts_mult_x(T);
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49
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50 return err;
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51 }
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52
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53 /** XTS Decryption
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54 @param ct [in] Ciphertext
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55 @param ptlen Length of plaintext (and ciphertext)
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56 @param pt [out] Plaintext
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57 @param tweak [in] The 128--bit encryption tweak (e.g. sector number)
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58 @param xts The XTS structure
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59 Returns CRYPT_OK upon success
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60 */int xts_decrypt(
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61 const unsigned char *ct, unsigned long ptlen,
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62 unsigned char *pt,
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63 const unsigned char *tweak,
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64 symmetric_xts *xts)
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65 {
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66 unsigned char PP[16], CC[16], T[16];
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67 unsigned long i, m, mo, lim;
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68 int err;
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69
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70 /* check inputs */
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71 LTC_ARGCHK(pt != NULL);
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72 LTC_ARGCHK(ct != NULL);
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73 LTC_ARGCHK(tweak != NULL);
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74 LTC_ARGCHK(xts != NULL);
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75
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76 /* check if valid */
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77 if ((err = cipher_is_valid(xts->cipher)) != CRYPT_OK) {
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78 return err;
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79 }
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80
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81 /* get number of blocks */
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82 m = ptlen >> 4;
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83 mo = ptlen & 15;
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84
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85 /* must have at least one full block */
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86 if (m == 0) {
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87 return CRYPT_INVALID_ARG;
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88 }
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89
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90 /* encrypt the tweak */
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91 if ((err = cipher_descriptor[xts->cipher].ecb_encrypt(tweak, T, &xts->key2)) != CRYPT_OK) {
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92 return err;
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93 }
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94
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95 /* for i = 0 to m-2 do */
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96 if (mo == 0) {
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97 lim = m;
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98 } else {
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99 lim = m - 1;
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100 }
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101
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102 for (i = 0; i < lim; i++) {
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103 err = tweak_uncrypt(ct, pt, T, xts);
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104 ct += 16;
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105 pt += 16;
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106 }
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107
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108 /* if ptlen not divide 16 then */
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109 if (mo > 0) {
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110 XMEMCPY(CC, T, 16);
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111 xts_mult_x(CC);
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112
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113 /* PP = tweak decrypt block m-1 */
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114 if ((err = tweak_uncrypt(ct, PP, CC, xts)) != CRYPT_OK) {
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115 return err;
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116 }
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117
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118 /* Pm = first ptlen % 16 bytes of PP */
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119 for (i = 0; i < mo; i++) {
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120 CC[i] = ct[16+i];
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121 pt[16+i] = PP[i];
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122 }
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123 for (; i < 16; i++) {
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124 CC[i] = PP[i];
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125 }
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126
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127 /* Pm-1 = Tweak uncrypt CC */
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128 if ((err = tweak_uncrypt(CC, pt, T, xts)) != CRYPT_OK) {
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129 return err;
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130 }
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131 }
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132
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133 return CRYPT_OK;
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134 }
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135
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136 #endif
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137
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138 /* $Source$ */
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139 /* $Revision$ */
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140 /* $Date$ */
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141