Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_start.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 ctr_start.c
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13 CTR implementation, start chain, Tom St Denis
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14 */
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16
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17 #ifdef LTC_CTR_MODE
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18
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19 /**
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20 Initialize a CTR context
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21 @param cipher The index of the cipher desired
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22 @param IV The initialization vector
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param num_rounds Number of rounds in the cipher desired (0 for default)
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26 @param ctr_mode The counter mode (CTR_COUNTER_LITTLE_ENDIAN or CTR_COUNTER_BIG_ENDIAN)
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27 @param ctr The CTR state to initialize
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28 @return CRYPT_OK if successful
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29 */
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30 int ctr_start( int cipher,
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31 const unsigned char *IV,
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32 const unsigned char *key, int keylen,
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33 int num_rounds, int ctr_mode,
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34 symmetric_CTR *ctr)
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35 {
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36 int x, err;
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37
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38 LTC_ARGCHK(IV != NULL);
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39 LTC_ARGCHK(key != NULL);
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40 LTC_ARGCHK(ctr != NULL);
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42 /* bad param? */
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43 if ((err = cipher_is_valid(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 /* ctrlen == counter width */
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48 ctr->ctrlen = (ctr_mode & 255) ? (ctr_mode & 255) : cipher_descriptor[cipher].block_length;
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49 if (ctr->ctrlen > cipher_descriptor[cipher].block_length) {
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50 return CRYPT_INVALID_ARG;
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51 }
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52
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53 if ((ctr_mode & 0x1000) == CTR_COUNTER_BIG_ENDIAN) {
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54 ctr->ctrlen = cipher_descriptor[cipher].block_length - ctr->ctrlen;
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55 }
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56
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57 /* setup cipher */
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58 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 /* copy ctr */
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63 ctr->blocklen = cipher_descriptor[cipher].block_length;
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64 ctr->cipher = cipher;
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65 ctr->padlen = 0;
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66 ctr->mode = ctr_mode & 0x1000;
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67 for (x = 0; x < ctr->blocklen; x++) {
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68 ctr->ctr[x] = IV[x];
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69 }
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70
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71 if (ctr_mode & LTC_CTR_RFC3686) {
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72 /* increment the IV as per RFC 3686 */
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73 if (ctr->mode == CTR_COUNTER_LITTLE_ENDIAN) {
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74 /* little-endian */
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75 for (x = 0; x < ctr->ctrlen; x++) {
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76 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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77 if (ctr->ctr[x] != (unsigned char)0) {
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78 break;
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79 }
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80 }
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81 } else {
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82 /* big-endian */
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83 for (x = ctr->blocklen-1; x >= ctr->ctrlen; x--) {
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84 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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85 if (ctr->ctr[x] != (unsigned char)0) {
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86 break;
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87 }
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88 }
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89 }
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90 }
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91
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92 return cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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93 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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94
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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95 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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96
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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97 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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98 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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99 /* commit time: $Format:%ai$ */