Mercurial > dropbear
annotate libtomcrypt/src/modes/cbc/cbc_decrypt.c @ 963:dccaecc68c77
use xauth in /usr/bin
Since the x.org rework, X has been installed into standard paths and not
its own random prefixes. I think it's time we update the default paths
accordingly.
author | Mike Frysinger <vapier@gentoo.org> |
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date | Fri, 01 Aug 2014 06:14:19 -0400 |
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 cbc_decrypt.c |
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15 CBC implementation, encrypt block, Tom St Denis |
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16 */ |
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17 |
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18 |
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19 #ifdef LTC_CBC_MODE |
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20 |
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21 /** |
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22 CBC decrypt |
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23 @param ct Ciphertext |
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24 @param pt [out] Plaintext |
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25 @param len The number of bytes to process (must be multiple of block length) |
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26 @param cbc CBC state |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CBC *cbc) |
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30 { |
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31 int x, err; |
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32 unsigned char tmp[16]; |
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33 #ifdef LTC_FAST |
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34 LTC_FAST_TYPE tmpy; |
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35 #else |
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36 unsigned char tmpy; |
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37 #endif |
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38 |
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39 LTC_ARGCHK(pt != NULL); |
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40 LTC_ARGCHK(ct != NULL); |
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41 LTC_ARGCHK(cbc != NULL); |
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42 |
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43 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) { |
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44 return err; |
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45 } |
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46 |
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47 /* is blocklen valid? */ |
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48 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) { |
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49 return CRYPT_INVALID_ARG; |
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50 } |
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51 |
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52 if (len % cbc->blocklen) { |
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53 return CRYPT_INVALID_ARG; |
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54 } |
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55 #ifdef LTC_FAST |
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56 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) { |
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57 return CRYPT_INVALID_ARG; |
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58 } |
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59 #endif |
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60 |
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61 if (cipher_descriptor[cbc->cipher].accel_cbc_decrypt != NULL) { |
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62 return cipher_descriptor[cbc->cipher].accel_cbc_decrypt(ct, pt, len / cbc->blocklen, cbc->IV, &cbc->key); |
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63 } else { |
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64 while (len) { |
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65 /* decrypt */ |
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66 if ((err = cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key)) != CRYPT_OK) { |
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67 return err; |
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68 } |
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69 |
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70 /* xor IV against plaintext */ |
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71 #if defined(LTC_FAST) |
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72 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { |
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73 tmpy = *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^ *((LTC_FAST_TYPE*)((unsigned char *)tmp + x)); |
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74 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); |
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75 *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) = tmpy; |
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76 } |
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77 #else |
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78 for (x = 0; x < cbc->blocklen; x++) { |
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79 tmpy = tmp[x] ^ cbc->IV[x]; |
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80 cbc->IV[x] = ct[x]; |
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81 pt[x] = tmpy; |
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82 } |
382
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83 #endif |
285
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84 |
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85 ct += cbc->blocklen; |
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86 pt += cbc->blocklen; |
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87 len -= cbc->blocklen; |
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88 } |
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89 } |
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90 return CRYPT_OK; |
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91 } |
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92 |
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93 #endif |
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94 |
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95 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_decrypt.c,v $ */ |
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96 /* $Revision: 1.15 $ */ |
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97 /* $Date: 2006/11/21 00:18:23 $ */ |