Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_encrypt.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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_encrypt.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 encrypt
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23 @param pt Plaintext
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24 @param ct [out] Ciphertext
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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_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CBC *cbc)
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30 {
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31 int x, err;
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32
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33 LTC_ARGCHK(pt != NULL);
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34 LTC_ARGCHK(ct != NULL);
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35 LTC_ARGCHK(cbc != NULL);
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36
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37 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 /* is blocklen valid? */
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42 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) {
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43 return CRYPT_INVALID_ARG;
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44 }
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45
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46 if (len % cbc->blocklen) {
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47 return CRYPT_INVALID_ARG;
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48 }
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49 #ifdef LTC_FAST
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50 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) {
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51 return CRYPT_INVALID_ARG;
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52 }
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53 #endif
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54
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55 if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) {
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56 return cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key);
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57 } else {
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58 while (len) {
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59 /* xor IV against plaintext */
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60 #if defined(LTC_FAST)
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61 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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62 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)pt + x));
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63 }
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64 #else
285
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65 for (x = 0; x < cbc->blocklen; x++) {
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66 cbc->IV[x] ^= pt[x];
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67 }
382
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68 #endif
285
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69
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70 /* encrypt */
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71 if ((err = cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key)) != CRYPT_OK) {
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72 return err;
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73 }
285
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74
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75 /* store IV [ciphertext] for a future block */
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76 #if defined(LTC_FAST)
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77 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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78 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x));
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79 }
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80 #else
285
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81 for (x = 0; x < cbc->blocklen; x++) {
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82 cbc->IV[x] = ct[x];
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83 }
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84 #endif
285
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85
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86 ct += cbc->blocklen;
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parents:
diff changeset
87 pt += cbc->blocklen;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 len -= cbc->blocklen;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_encrypt.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
97 /* $Revision: 1.13 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
98 /* $Date: 2006/11/21 00:18:23 $ */