Mercurial > dropbear
annotate libtomcrypt/src/modes/lrw/lrw_process.c @ 744:504f33c684b5 kexguess
Add sentinel attribute
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 03 Apr 2013 00:32:05 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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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.com |
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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 @file lrw_process.c |
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15 LRW_MODE implementation, Encrypt/decrypt blocks, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef LTC_LRW_MODE |
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19 |
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20 /** |
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21 Process blocks with LRW, since decrypt/encrypt are largely the same they share this code. |
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22 @param pt The "input" data |
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23 @param ct [out] The "output" data |
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24 @param len The length of the input, must be a multiple of 128-bits (16 octets) |
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25 @param mode LRW_ENCRYPT or LRW_DECRYPT |
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26 @param lrw The LRW state |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int lrw_process(const unsigned char *pt, unsigned char *ct, unsigned long len, int mode, symmetric_LRW *lrw) |
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30 { |
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31 unsigned char prod[16]; |
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32 int x, err; |
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33 #ifdef LRW_TABLES |
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34 int y; |
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35 #endif |
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36 |
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37 LTC_ARGCHK(pt != NULL); |
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38 LTC_ARGCHK(ct != NULL); |
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39 LTC_ARGCHK(lrw != NULL); |
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40 |
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41 if (len & 15) { |
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42 return CRYPT_INVALID_ARG; |
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43 } |
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44 |
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45 while (len) { |
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46 /* copy pad */ |
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47 XMEMCPY(prod, lrw->pad, 16); |
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48 |
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49 /* increment IV */ |
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50 for (x = 15; x >= 0; x--) { |
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51 lrw->IV[x] = (lrw->IV[x] + 1) & 255; |
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52 if (lrw->IV[x]) { |
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53 break; |
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54 } |
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55 } |
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56 |
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57 /* update pad */ |
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58 #ifdef LRW_TABLES |
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59 /* for each byte changed we undo it's affect on the pad then add the new product */ |
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60 for (; x < 16; x++) { |
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61 #ifdef LTC_FAST |
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62 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) { |
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63 *((LTC_FAST_TYPE *)(lrw->pad + y)) ^= *((LTC_FAST_TYPE *)(&lrw->PC[x][lrw->IV[x]][y])) ^ *((LTC_FAST_TYPE *)(&lrw->PC[x][(lrw->IV[x]-1)&255][y])); |
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64 } |
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65 #else |
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66 for (y = 0; y < 16; y++) { |
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67 lrw->pad[y] ^= lrw->PC[x][lrw->IV[x]][y] ^ lrw->PC[x][(lrw->IV[x]-1)&255][y]; |
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68 } |
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69 #endif |
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70 } |
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71 #else |
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72 gcm_gf_mult(lrw->tweak, lrw->IV, lrw->pad); |
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73 #endif |
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74 |
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75 /* xor prod */ |
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76 #ifdef LTC_FAST |
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77 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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78 *((LTC_FAST_TYPE *)(ct + x)) = *((LTC_FAST_TYPE *)(pt + x)) ^ *((LTC_FAST_TYPE *)(prod + x)); |
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79 } |
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80 #else |
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81 for (x = 0; x < 16; x++) { |
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82 ct[x] = pt[x] ^ prod[x]; |
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83 } |
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84 #endif |
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85 |
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86 /* send through cipher */ |
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87 if (mode == LRW_ENCRYPT) { |
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88 if ((err = cipher_descriptor[lrw->cipher].ecb_encrypt(ct, ct, &lrw->key)) != CRYPT_OK) { |
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89 return err; |
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90 } |
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91 } else { |
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92 if ((err = cipher_descriptor[lrw->cipher].ecb_decrypt(ct, ct, &lrw->key)) != CRYPT_OK) { |
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93 return err; |
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94 } |
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95 } |
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96 |
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97 /* xor prod */ |
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98 #ifdef LTC_FAST |
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99 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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100 *((LTC_FAST_TYPE *)(ct + x)) = *((LTC_FAST_TYPE *)(ct + x)) ^ *((LTC_FAST_TYPE *)(prod + x)); |
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101 } |
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102 #else |
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103 for (x = 0; x < 16; x++) { |
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104 ct[x] = ct[x] ^ prod[x]; |
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105 } |
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106 #endif |
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107 |
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108 /* move to next */ |
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109 pt += 16; |
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110 ct += 16; |
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111 len -= 16; |
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112 } |
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113 |
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114 return CRYPT_OK; |
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115 } |
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116 |
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117 #endif |
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118 /* $Source: /cvs/libtom/libtomcrypt/src/modes/lrw/lrw_process.c,v $ */ |
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119 /* $Revision: 1.10 $ */ |
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120 /* $Date: 2006/06/29 01:53:13 $ */ |