Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_encrypt.c @ 476:df7f7da7f6e4 pubkey-options

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- Rework pubkey options to be more careful about buffer lengths. Needs review.
author Matt Johnston <matt@ucc.asn.au>
date Fri, 12 Sep 2008 17:23:56 +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
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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 }
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68 #endif
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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 }
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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
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85
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86 ct += cbc->blocklen;
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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 $ */