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comparison src/ciphers/rc6.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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143:5d99163f7e32 191:1c15b283127b
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11
12 /**
13 @file rc6.c
14 RC6 code by Tom St Denis
15 */
16 #include "tomcrypt.h"
17
18 #ifdef RC6
19
20 const struct ltc_cipher_descriptor rc6_desc =
21 {
22 "rc6",
23 3,
24 8, 128, 16, 20,
25 &rc6_setup,
26 &rc6_ecb_encrypt,
27 &rc6_ecb_decrypt,
28 &rc6_test,
29 &rc6_done,
30 &rc6_keysize,
31 NULL, NULL, NULL, NULL, NULL, NULL, NULL
32 };
33
34 static const ulong32 stab[44] = {
35 0xb7e15163UL, 0x5618cb1cUL, 0xf45044d5UL, 0x9287be8eUL, 0x30bf3847UL, 0xcef6b200UL, 0x6d2e2bb9UL, 0x0b65a572UL,
36 0xa99d1f2bUL, 0x47d498e4UL, 0xe60c129dUL, 0x84438c56UL, 0x227b060fUL, 0xc0b27fc8UL, 0x5ee9f981UL, 0xfd21733aUL,
37 0x9b58ecf3UL, 0x399066acUL, 0xd7c7e065UL, 0x75ff5a1eUL, 0x1436d3d7UL, 0xb26e4d90UL, 0x50a5c749UL, 0xeedd4102UL,
38 0x8d14babbUL, 0x2b4c3474UL, 0xc983ae2dUL, 0x67bb27e6UL, 0x05f2a19fUL, 0xa42a1b58UL, 0x42619511UL, 0xe0990ecaUL,
39 0x7ed08883UL, 0x1d08023cUL, 0xbb3f7bf5UL, 0x5976f5aeUL, 0xf7ae6f67UL, 0x95e5e920UL, 0x341d62d9UL, 0xd254dc92UL,
40 0x708c564bUL, 0x0ec3d004UL, 0xacfb49bdUL, 0x4b32c376UL };
41
42 /**
43 Initialize the RC6 block cipher
44 @param key The symmetric key you wish to pass
45 @param keylen The key length in bytes
46 @param num_rounds The number of rounds desired (0 for default)
47 @param skey The key in as scheduled by this function.
48 @return CRYPT_OK if successful
49 */
50 #ifdef LTC_CLEAN_STACK
51 static int _rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
52 #else
53 int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
54 #endif
55 {
56 ulong32 L[64], S[50], A, B, i, j, v, s, l;
57
58 LTC_ARGCHK(key != NULL);
59 LTC_ARGCHK(skey != NULL);
60
61 /* test parameters */
62 if (num_rounds != 0 && num_rounds != 20) {
63 return CRYPT_INVALID_ROUNDS;
64 }
65
66 /* key must be between 64 and 1024 bits */
67 if (keylen < 8 || keylen > 128) {
68 return CRYPT_INVALID_KEYSIZE;
69 }
70
71 /* copy the key into the L array */
72 for (A = i = j = 0; i < (ulong32)keylen; ) {
73 A = (A << 8) | ((ulong32)(key[i++] & 255));