Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_decrypt.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
382
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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);
285
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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 }
285
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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
285
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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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diff changeset
86 pt += cbc->blocklen;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 len -= cbc->blocklen;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
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 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
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 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_decrypt.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
96 /* $Revision: 1.15 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
97 /* $Date: 2006/11/21 00:18:23 $ */