Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_encrypt.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 #else
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79 for (x = 0; x < cbc->blocklen; x++) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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80 cbc->IV[x] = ct[x];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 ct += cbc->blocklen;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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94 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
95 /* 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
96 /* commit time: $Format:%ai$ */