Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 1435:f849a5ca2efc

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update to libtomcrypt 1.17 (with Dropbear changes)
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 17:50:50 +0800
parents 0cbe8f6dbf9e
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
382
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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 xcbc_init.c
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15 XCBC Support, start an XCBC state
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16 */
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17
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18 #ifdef LTC_XCBC
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19
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20 /** Initialize XCBC-MAC state
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21 @param xcbc [out] XCBC state to initialize
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22 @param cipher Index of cipher to use
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23 @param key [in] Secret key
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24 @param keylen Length of secret key in octets
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25 Return CRYPT_OK on success
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26 */
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27 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen)
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28 {
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29 int x, y, err;
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30 symmetric_key *skey;
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31 unsigned long k1;
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32
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33 LTC_ARGCHK(xcbc != NULL);
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34 LTC_ARGCHK(key != NULL);
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35
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36 /* schedule the key */
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37 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 #ifdef LTC_FAST
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42 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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43 return CRYPT_INVALID_ARG;
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44 }
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45 #endif
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46
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47 skey = NULL;
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48
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49 /* are we in pure XCBC mode with three keys? */
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50 if (keylen & LTC_XCBC_PURE) {
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51 keylen &= ~LTC_XCBC_PURE;
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52
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53 if (keylen < 2UL*cipher_descriptor[cipher].block_length) {
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54 return CRYPT_INVALID_ARG;
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55 }
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56
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57 k1 = keylen - 2*cipher_descriptor[cipher].block_length;
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58 XMEMCPY(xcbc->K[0], key, k1);
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59 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length);
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60 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length);
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61 } else {
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62 /* use the key expansion */
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63 k1 = cipher_descriptor[cipher].block_length;
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64
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65 /* schedule the user key */
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66 skey = XCALLOC(1, sizeof(*skey));
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67 if (skey == NULL) {
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68 return CRYPT_MEM;
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69 }
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70
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71 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) {
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72 goto done;
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73 }
382
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74
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75 /* make the three keys */
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76 for (y = 0; y < 3; y++) {
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77 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) {
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78 xcbc->K[y][x] = y + 1;
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79 }
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80 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey);
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81 }
382
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82 }
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83
382
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84 /* setup K1 */
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85 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key);
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86
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87 /* setup struct */
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88 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length);
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89 xcbc->blocksize = cipher_descriptor[cipher].block_length;
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90 xcbc->cipher = cipher;
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91 xcbc->buflen = 0;
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92 done:
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93 cipher_descriptor[cipher].done(skey);
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94 if (skey != NULL) {
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95 #ifdef LTC_CLEAN_STACK
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96 zeromem(skey, sizeof(*skey));
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97 #endif
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98 XFREE(skey);
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99 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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101 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
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102
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
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104
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
105 /* $Source$ */
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
106 /* $Revision$ */
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Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
107 /* $Date$ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108