Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_start.c @ 1470:8bba51a55704

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Update to libtommath v1.0.1
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Feb 2018 23:11:40 +0800
parents f849a5ca2efc
children 6dba84798cd5
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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 * Tom St Denis, [email protected], http://libtom.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file ctr_start.c
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15 CTR implementation, start chain, Tom St Denis
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16 */
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17
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18
382
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19 #ifdef LTC_CTR_MODE
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20
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21 /**
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22 Initialize a CTR context
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23 @param cipher The index of the cipher desired
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24 @param IV The initial vector
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25 @param key The secret key
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26 @param keylen The length of the secret key (octets)
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27 @param num_rounds Number of rounds in the cipher desired (0 for default)
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28 @param ctr_mode The counter mode (CTR_COUNTER_LITTLE_ENDIAN or CTR_COUNTER_BIG_ENDIAN)
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29 @param ctr The CTR state to initialize
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30 @return CRYPT_OK if successful
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31 */
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32 int ctr_start( int cipher,
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33 const unsigned char *IV,
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34 const unsigned char *key, int keylen,
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35 int num_rounds, int ctr_mode,
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36 symmetric_CTR *ctr)
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37 {
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38 int x, err;
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39
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40 LTC_ARGCHK(IV != NULL);
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41 LTC_ARGCHK(key != NULL);
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42 LTC_ARGCHK(ctr != NULL);
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43
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44 /* bad param? */
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45 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 /* ctrlen == counter width */
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50 ctr->ctrlen = (ctr_mode & 255) ? (ctr_mode & 255) : cipher_descriptor[cipher].block_length;
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51 if (ctr->ctrlen > cipher_descriptor[cipher].block_length) {
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52 return CRYPT_INVALID_ARG;
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53 }
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54
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55 if ((ctr_mode & 0x1000) == CTR_COUNTER_BIG_ENDIAN) {
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56 ctr->ctrlen = cipher_descriptor[cipher].block_length - ctr->ctrlen;
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57 }
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58
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59 /* setup cipher */
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60 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {
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61 return err;
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62 }
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63
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64 /* copy ctr */
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65 ctr->blocklen = cipher_descriptor[cipher].block_length;
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66 ctr->cipher = cipher;
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67 ctr->padlen = 0;
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68 ctr->mode = ctr_mode & 0x1000;
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69 for (x = 0; x < ctr->blocklen; x++) {
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70 ctr->ctr[x] = IV[x];
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71 }
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72
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73 if (ctr_mode & LTC_CTR_RFC3686) {
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74 /* increment the IV as per RFC 3686 */
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75 if (ctr->mode == CTR_COUNTER_LITTLE_ENDIAN) {
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76 /* little-endian */
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77 for (x = 0; x < ctr->ctrlen; x++) {
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78 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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79 if (ctr->ctr[x] != (unsigned char)0) {
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80 break;
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81 }
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82 }
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83 } else {
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84 /* big-endian */
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85 for (x = ctr->blocklen-1; x >= ctr->ctrlen; x--) {
382
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86 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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87 if (ctr->ctr[x] != (unsigned char)0) {
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88 break;
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89 }
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90 }
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91 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
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92 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
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93
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
94 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)
Matt Johnston <matt@ucc.asn.au>
parents:
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95 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
99 /* $Source$ */
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
100 /* $Revision$ */
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Matt Johnston <matt@ucc.asn.au>
parents: 382
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101 /* $Date$ */