Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_encrypt.c @ 1853:2be3115a8762

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debugging test runner authorized_keys perms
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Oct 2021 13:45:59 +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_encrypt.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 encrypt
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21 @param pt Plaintext
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22 @param ct [out] Ciphertext
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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_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CBC *cbc)
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28 {
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29 int x, err;
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30
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31 LTC_ARGCHK(pt != NULL);
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32 LTC_ARGCHK(ct != NULL);
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33 LTC_ARGCHK(cbc != NULL);
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34
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35 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
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36 return err;
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37 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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38
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39 /* is blocklen valid? */
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40 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43
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44 if (len % cbc->blocklen) {
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45 return CRYPT_INVALID_ARG;
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46 }
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47 #ifdef LTC_FAST
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48 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) {
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49 return CRYPT_INVALID_ARG;
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50 }
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51 #endif
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52
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53 if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) {
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54 return cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key);
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55 } else {
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56 while (len) {
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57 /* xor IV against plaintext */
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58 #if defined(LTC_FAST)
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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60 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) ^= *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x));
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61 }
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62 #else
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63 for (x = 0; x < cbc->blocklen; x++) {
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64 cbc->IV[x] ^= pt[x];
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65 }
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66 #endif
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67
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68 /* encrypt */
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69 if ((err = cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key)) != CRYPT_OK) {
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70 return err;
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71 }
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72
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 /* store IV [ciphertext] for a future block */
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74 #if defined(LTC_FAST)
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75 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
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76 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)cbc->IV + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x));
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77 }
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78 #else
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79 for (x = 0; x < cbc->blocklen; x++) {
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80 cbc->IV[x] = ct[x];
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81 }
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82 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83
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84 ct += cbc->blocklen;
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85 pt += cbc->blocklen;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 len -= cbc->blocklen;
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87 }
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88 }
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89 return CRYPT_OK;
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90 }
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91
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92 #endif
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93
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94 /* ref: $Format:%D$ */
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95 /* git commit: $Format:%H$ */
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96 /* commit time: $Format:%ai$ */