Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_start.c @ 1538:f20038b513a5

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more linting (#58) * const parameter * fix indentation
author François Perrad <francois.perrad@gadz.org>
date Mon, 26 Feb 2018 14:31:15 +0100
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);
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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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parents:
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95 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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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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parents: 1435
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99 /* commit time: $Format:%ai$ */