Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_decrypt.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file cbc_decrypt.c
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13 CBC implementation, encrypt block, Tom St Denis
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14 */
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16
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17 #ifdef LTC_CBC_MODE
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18
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19 /**
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20 CBC decrypt
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21 @param ct Ciphertext
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22 @param pt [out] Plaintext
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23 @param len The number of bytes to process (must be multiple of block length)
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24 @param cbc CBC state
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25 @return CRYPT_OK if successful
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26 */
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27 int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CBC *cbc)
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28 {
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29 int x, err;
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30 unsigned char tmp[16];
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31 #ifdef LTC_FAST
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32 LTC_FAST_TYPE tmpy;
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33 #else
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34 unsigned char tmpy;
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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(cbc != NULL);
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40
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41 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
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42 return err;
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43 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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44
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45 /* is blocklen valid? */
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46 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV) || cbc->blocklen > (int)sizeof(tmp)) {
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47 return CRYPT_INVALID_ARG;
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48 }
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49
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50 if (len % cbc->blocklen) {
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51 return CRYPT_INVALID_ARG;
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52 }
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53 #ifdef LTC_FAST
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54 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) {
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55 return CRYPT_INVALID_ARG;
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56 }
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57 #endif
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58
285
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59 if (cipher_descriptor[cbc->cipher].accel_cbc_decrypt != NULL) {
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60 return cipher_descriptor[cbc->cipher].accel_cbc_decrypt(ct, pt, len / cbc->blocklen, cbc->IV, &cbc->key);
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61 } else {
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62 while (len) {
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63 /* decrypt */
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64 if ((err = cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key)) != CRYPT_OK) {
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65 return err;
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66 }
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67
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68 /* xor IV against plaintext */
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69 #if defined(LTC_FAST)
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70 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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71 tmpy = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) ^ *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)tmp + x));
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72 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x));
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73 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x)) = tmpy;
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74 }
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75 #else
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76 for (x = 0; x < cbc->blocklen; x++) {
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77 tmpy = tmp[x] ^ cbc->IV[x];
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78 cbc->IV[x] = ct[x];
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79 pt[x] = tmpy;
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80 }
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81 #endif
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82
285
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83 ct += cbc->blocklen;
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84 pt += cbc->blocklen;
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85 len -= cbc->blocklen;
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86 }
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87 }
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88 return CRYPT_OK;
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89 }
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90
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91 #endif
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92
1471
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93 /* ref: $Format:%D$ */
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94 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
95 /* commit time: $Format:%ai$ */