Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb3/ocb3_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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 /**
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11 @file ocb3_encrypt.c
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12 OCB implementation, encrypt data, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_OCB3_MODE
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17
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18 /**
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19 Encrypt blocks of data with OCB
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20 @param ocb The OCB state
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21 @param pt The plaintext (length multiple of the block size of the block cipher)
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22 @param ptlen The length of the input (octets)
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23 @param ct [out] The ciphertext (same size as the pt)
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24 @return CRYPT_OK if successful
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25 */
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26 int ocb3_encrypt(ocb3_state *ocb, const unsigned char *pt, unsigned long ptlen, unsigned char *ct)
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27 {
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28 unsigned char tmp[MAXBLOCKSIZE];
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29 int err, i, full_blocks;
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30 unsigned char *pt_b, *ct_b;
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31
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32 LTC_ARGCHK(ocb != NULL);
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33 if (ptlen == 0) return CRYPT_OK; /* no data, nothing to do */
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34 LTC_ARGCHK(pt != NULL);
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35 LTC_ARGCHK(ct != NULL);
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36
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37 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
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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 (ptlen % ocb->block_len) { /* ptlen has to bu multiple of block_len */
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45 return CRYPT_INVALID_ARG;
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46 }
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47
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48 full_blocks = ptlen/ocb->block_len;
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49 for(i=0; i<full_blocks; i++) {
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50 pt_b = (unsigned char *)pt+i*ocb->block_len;
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51 ct_b = (unsigned char *)ct+i*ocb->block_len;
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52
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53 /* ocb->Offset_current[] = ocb->Offset_current[] ^ Offset_{ntz(block_index)} */
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54 ocb3_int_xor_blocks(ocb->Offset_current, ocb->Offset_current, ocb->L_[ocb3_int_ntz(ocb->block_index)], ocb->block_len);
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55
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56 /* tmp[] = pt[] XOR ocb->Offset_current[] */
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57 ocb3_int_xor_blocks(tmp, pt_b, ocb->Offset_current, ocb->block_len);
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58
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59 /* encrypt */
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60 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
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61 goto LBL_ERR;
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62 }
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63
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64 /* ct[] = tmp[] XOR ocb->Offset_current[] */
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65 ocb3_int_xor_blocks(ct_b, tmp, ocb->Offset_current, ocb->block_len);
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66
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67 /* ocb->checksum[] = ocb->checksum[] XOR pt[] */
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68 ocb3_int_xor_blocks(ocb->checksum, ocb->checksum, pt_b, ocb->block_len);
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69
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70 ocb->block_index++;
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71 }
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72
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73 err = CRYPT_OK;
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74
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75 LBL_ERR:
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76 #ifdef LTC_CLEAN_STACK
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77 zeromem(tmp, sizeof(tmp));
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78 #endif
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79 return err;
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80 }
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81
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82 #endif
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83
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84 /* ref: $Format:%D$ */
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85 /* git commit: $Format:%H$ */
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86 /* commit time: $Format:%ai$ */