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comparison 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
comparison
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1434:27b9ddb06b09 1435:f849a5ca2efc
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 * 8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.com 9 * Tom St Denis, [email protected], http://libtom.org
10 */ 10 */
11 #include "tomcrypt.h" 11 #include "tomcrypt.h"
12 12
13 /** 13 /**
14 @file xcbc_init.c 14 @file xcbc_init.c
26 */ 26 */
27 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen) 27 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen)
28 { 28 {
29 int x, y, err; 29 int x, y, err;
30 symmetric_key *skey; 30 symmetric_key *skey;
31 unsigned long k1;
31 32
32 LTC_ARGCHK(xcbc != NULL); 33 LTC_ARGCHK(xcbc != NULL);
33 LTC_ARGCHK(key != NULL); 34 LTC_ARGCHK(key != NULL);
34 35
35 /* schedule the key */ 36 /* schedule the key */
41 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { 42 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
42 return CRYPT_INVALID_ARG; 43 return CRYPT_INVALID_ARG;
43 } 44 }
44 #endif 45 #endif
45 46
46 /* schedule the user key */ 47 skey = NULL;
47 skey = XCALLOC(1, sizeof(*skey)); 48
48 if (skey == NULL) { 49 /* are we in pure XCBC mode with three keys? */
49 return CRYPT_MEM; 50 if (keylen & LTC_XCBC_PURE) {
51 keylen &= ~LTC_XCBC_PURE;
52
53 if (keylen < 2UL*cipher_descriptor[cipher].block_length) {
54 return CRYPT_INVALID_ARG;
55 }
56
57 k1 = keylen - 2*cipher_descriptor[cipher].block_length;
58 XMEMCPY(xcbc->K[0], key, k1);
59 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length);
60 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length);
61 } else {
62 /* use the key expansion */
63 k1 = cipher_descriptor[cipher].block_length;
64
65 /* schedule the user key */
66 skey = XCALLOC(1, sizeof(*skey));
67 if (skey == NULL) {
68 return CRYPT_MEM;
69 }
70
71 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) {
72 goto done;
73 }
74
75 /* make the three keys */
76 for (y = 0; y < 3; y++) {
77 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) {
78 xcbc->K[y][x] = y + 1;
79 }
80 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey);
81 }
50 } 82 }
51 83
52 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) {
53 goto done;
54 }
55
56 /* make the three keys */
57 for (y = 0; y < 3; y++) {
58 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) {
59 xcbc->K[y][x] = y + 1;
60 }
61 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey);
62 }
63
64 /* setup K1 */ 84 /* setup K1 */
65 err = cipher_descriptor[cipher].setup(xcbc->K[0], cipher_descriptor[cipher].block_length, 0, &xcbc->key); 85 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key);
66 86
67 /* setup struct */ 87 /* setup struct */
68 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length); 88 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length);
69 xcbc->blocksize = cipher_descriptor[cipher].block_length; 89 xcbc->blocksize = cipher_descriptor[cipher].block_length;
70 xcbc->cipher = cipher; 90 xcbc->cipher = cipher;
71 xcbc->buflen = 0; 91 xcbc->buflen = 0;
72 done: 92 done:
73 cipher_descriptor[cipher].done(skey); 93 cipher_descriptor[cipher].done(skey);
94 if (skey != NULL) {
74 #ifdef LTC_CLEAN_STACK 95 #ifdef LTC_CLEAN_STACK
75 zeromem(skey, sizeof(*skey)); 96 zeromem(skey, sizeof(*skey));
76 #endif 97 #endif
77 XFREE(skey); 98 XFREE(skey);
99 }
78 return err; 100 return err;
79 } 101 }
80 102
81 #endif 103 #endif
82 104
83 /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_init.c,v $ */ 105 /* $Source$ */
84 /* $Revision: 1.4 $ */ 106 /* $Revision$ */
85 /* $Date: 2006/11/07 03:23:46 $ */ 107 /* $Date$ */
86 108