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annotate 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
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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://libtomcrypt.org
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10 */
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11
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12 /**
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13 @file rc6.c
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14 RC6 code by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef RC6
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19
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20 const struct ltc_cipher_descriptor rc6_desc =
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21 {
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22 "rc6",
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23 3,
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24 8, 128, 16, 20,
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25 &rc6_setup,
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26 &rc6_ecb_encrypt,
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27 &rc6_ecb_decrypt,
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28 &rc6_test,
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29 &rc6_done,
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30 &rc6_keysize,
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31 NULL, NULL, NULL, NULL, NULL, NULL, NULL
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32 };
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33
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34 static const ulong32 stab[44] = {
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35 0xb7e15163UL, 0x5618cb1cUL, 0xf45044d5UL, 0x9287be8eUL, 0x30bf3847UL, 0xcef6b200UL, 0x6d2e2bb9UL, 0x0b65a572UL,
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36 0xa99d1f2bUL, 0x47d498e4UL, 0xe60c129dUL, 0x84438c56UL, 0x227b060fUL, 0xc0b27fc8UL, 0x5ee9f981UL, 0xfd21733aUL,
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37 0x9b58ecf3UL, 0x399066acUL, 0xd7c7e065UL, 0x75ff5a1eUL, 0x1436d3d7UL, 0xb26e4d90UL, 0x50a5c749UL, 0xeedd4102UL,
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38 0x8d14babbUL, 0x2b4c3474UL, 0xc983ae2dUL, 0x67bb27e6UL, 0x05f2a19fUL, 0xa42a1b58UL, 0x42619511UL, 0xe0990ecaUL,
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39 0x7ed08883UL, 0x1d08023cUL, 0xbb3f7bf5UL, 0x5976f5aeUL, 0xf7ae6f67UL, 0x95e5e920UL, 0x341d62d9UL, 0xd254dc92UL,
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40 0x708c564bUL, 0x0ec3d004UL, 0xacfb49bdUL, 0x4b32c376UL };
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41
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42 /**
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43 Initialize the RC6 block cipher
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44 @param key The symmetric key you wish to pass
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45 @param keylen The key length in bytes
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46 @param num_rounds The number of rounds desired (0 for default)
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47 @param skey The key in as scheduled by this function.
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48 @return CRYPT_OK if successful
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49 */
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50 #ifdef LTC_CLEAN_STACK
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51 static int _rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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52 #else
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53 int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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54 #endif
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55 {
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56 ulong32 L[64], S[50], A, B, i, j, v, s, l;
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57
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58 LTC_ARGCHK(key != NULL);
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59 LTC_ARGCHK(skey != NULL);
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60
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61 /* test parameters */
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62 if (num_rounds != 0 && num_rounds != 20) {
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63 return CRYPT_INVALID_ROUNDS;
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64 }
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65
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66 /* key must be between 64 and 1024 bits */
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67 if (keylen < 8 || keylen > 128) {
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68 return CRYPT_INVALID_KEYSIZE;
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69 }
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70
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71 /* copy the key into the L array */
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72 for (A = i = j = 0; i < (ulong32)keylen; ) {
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73 A = (A << 8) | ((ulong32)(key[i++] & 255));
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74 if (!(i & 3)) {
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75 L[j++] = BSWAP(A);
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76 A = 0;
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77 }
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78 }
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79
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80 /* handle odd sized keys */
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81 if (keylen & 3) {
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82 A <<= (8 * (4 - (keylen&3)));
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83 L[j++] = BSWAP(A);
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84 }
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85
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86 /* setup the S array */
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87 XMEMCPY(S, stab, 44 * sizeof(stab[0]));
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88
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89 /* mix buffer */
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90 s = 3 * MAX(44, j);
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91 l = j;
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92 for (A = B = i = j = v = 0; v < s; v++) {
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93 A = S[i] = ROLc(S[i] + A + B, 3);
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94 B = L[j] = ROL(L[j] + A + B, (A+B));
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95 if (++i == 44) { i = 0; }
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96 if (++j == l) { j = 0; }
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97 }
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98
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99 /* copy to key */
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100 for (i = 0; i < 44; i++) {
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101 skey->rc6.K[i] = S[i];
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102 }
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103 return CRYPT_OK;
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104 }
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105
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106 #ifdef LTC_CLEAN_STACK
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107 int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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108 {
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109 int x;
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110 x = _rc6_setup(key, keylen, num_rounds, skey);
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111 burn_stack(sizeof(ulong32) * 122);
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112 return x;
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113 }
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114 #endif
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115
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116 /**
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117 Encrypts a block of text with RC6
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118 @param pt The input plaintext (16 bytes)
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119 @param ct The output ciphertext (16 bytes)
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120 @param skey The key as scheduled
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121 */
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122 #ifdef LTC_CLEAN_STACK
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123 static void _rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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124 #else
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125 void rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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126 #endif
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127 {
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128 ulong32 a,b,c,d,t,u, *K;
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129 int r;
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130
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131 LTC_ARGCHK(skey != NULL);
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132 LTC_ARGCHK(pt != NULL);
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133 LTC_ARGCHK(ct != NULL);
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diff changeset
134 LOAD32L(a,&pt[0]);LOAD32L(b,&pt[4]);LOAD32L(c,&pt[8]);LOAD32L(d,&pt[12]);
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diff changeset
135
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diff changeset
136 b += skey->rc6.K[0];
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diff changeset
137 d += skey->rc6.K[1];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
138
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
139 #define RND(a,b,c,d) \
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diff changeset
140 t = (b * (b + b + 1)); t = ROLc(t, 5); \
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parents:
diff changeset
141 u = (d * (d + d + 1)); u = ROLc(u, 5); \
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parents:
diff changeset
142 a = ROL(a^t,u) + K[0]; \
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parents:
diff changeset
143 c = ROL(c^u,t) + K[1]; K += 2;
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parents:
diff changeset
144
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diff changeset
145 K = skey->rc6.K + 2;
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diff changeset
146 for (r = 0; r < 20; r += 4) {
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diff changeset
147 RND(a,b,c,d);
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diff changeset
148 RND(b,c,d,a);
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diff changeset
149 RND(c,d,a,b);
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diff changeset
150 RND(d,a,b,c);
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diff changeset
151 }
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diff changeset
152
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diff changeset
153 #undef RND
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diff changeset
154
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
155 a += skey->rc6.K[42];
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diff changeset
156 c += skey->rc6.K[43];
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parents:
diff changeset
157 STORE32L(a,&ct[0]);STORE32L(b,&ct[4]);STORE32L(c,&ct[8]);STORE32L(d,&ct[12]);
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diff changeset
158 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
160 #ifdef LTC_CLEAN_STACK
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parents:
diff changeset
161 void rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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diff changeset
162 {
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diff changeset
163 _rc6_ecb_encrypt(pt, ct, skey);
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parents:
diff changeset
164 burn_stack(sizeof(ulong32) * 6 + sizeof(int));
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diff changeset
165 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 #endif
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parents:
diff changeset
167
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
169 Decrypts a block of text with RC6
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parents:
diff changeset
170 @param ct The input ciphertext (16 bytes)
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parents:
diff changeset
171 @param pt The output plaintext (16 bytes)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 @param skey The key as scheduled
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 #ifdef LTC_CLEAN_STACK
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 static void _rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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parents:
diff changeset
176 #else
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parents:
diff changeset
177 void rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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diff changeset
178 #endif
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diff changeset
179 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
180 ulong32 a,b,c,d,t,u, *K;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 int r;
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parents:
diff changeset
182
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parents:
diff changeset
183 LTC_ARGCHK(skey != NULL);
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parents:
diff changeset
184 LTC_ARGCHK(pt != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 LTC_ARGCHK(ct != NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186
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parents:
diff changeset
187 LOAD32L(a,&ct[0]);LOAD32L(b,&ct[4]);LOAD32L(c,&ct[8]);LOAD32L(d,&ct[12]);
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parents:
diff changeset
188 a -= skey->rc6.K[42];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 c -= skey->rc6.K[43];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 #define RND(a,b,c,d) \
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 t = (b * (b + b + 1)); t = ROLc(t, 5); \
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parents:
diff changeset
193 u = (d * (d + d + 1)); u = ROLc(u, 5); \
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194 c = ROR(c - K[1], t) ^ u; \
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
195 a = ROR(a - K[0], u) ^ t; K -= 2;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197 K = skey->rc6.K + 40;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 for (r = 0; r < 20; r += 4) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 RND(d,a,b,c);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 RND(c,d,a,b);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 RND(b,c,d,a);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 RND(a,b,c,d);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 #undef RND
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 b -= skey->rc6.K[0];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 d -= skey->rc6.K[1];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 STORE32L(a,&pt[0]);STORE32L(b,&pt[4]);STORE32L(c,&pt[8]);STORE32L(d,&pt[12]);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 #ifdef LTC_CLEAN_STACK
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 void rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 _rc6_ecb_decrypt(ct, pt, skey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 burn_stack(sizeof(ulong32) * 6 + sizeof(int));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 Performs a self-test of the RC6 block cipher
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 int rc6_test(void)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 #ifndef LTC_TEST
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 return CRYPT_NOP;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 #else
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 static const struct {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 int keylen;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 unsigned char key[32], pt[16], ct[16];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 } tests[] = {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 16,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 { 0x52, 0x4e, 0x19, 0x2f, 0x47, 0x15, 0xc6, 0x23,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 0x1f, 0x51, 0xf6, 0x36, 0x7e, 0xa4, 0x3f, 0x18 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 24,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 { 0x68, 0x83, 0x29, 0xd0, 0x19, 0xe5, 0x05, 0x04,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 0x1e, 0x52, 0xe9, 0x2a, 0xf9, 0x52, 0x91, 0xd4 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 32,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
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263 0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
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264 { 0xc8, 0x24, 0x18, 0x16, 0xf0, 0xd7, 0xe4, 0x89,
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265 0x20, 0xad, 0x16, 0xa1, 0x67, 0x4e, 0x5d, 0x48 }
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266 }
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267 };
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268 unsigned char tmp[2][16];
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269 int x, y, err;
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270 symmetric_key key;
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271
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272 for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
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273 /* setup key */
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274 if ((err = rc6_setup(tests[x].key, tests[x].keylen, 0, &key)) != CRYPT_OK) {
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275 return err;
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276 }
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277
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278 /* encrypt and decrypt */
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279 rc6_ecb_encrypt(tests[x].pt, tmp[0], &key);
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280 rc6_ecb_decrypt(tmp[0], tmp[1], &key);
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281
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282 /* compare */
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283 if (memcmp(tmp[0], tests[x].ct, 16) || memcmp(tmp[1], tests[x].pt, 16)) {
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284 #if 0
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285 printf("\n\nFailed test %d\n", x);
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286 if (memcmp(tmp[0], tests[x].ct, 16)) {
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287 printf("Ciphertext: ");
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288 for (y = 0; y < 16; y++) printf("%02x ", tmp[0][y]);
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289 printf("\nExpected : ");
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290 for (y = 0; y < 16; y++) printf("%02x ", tests[x].ct[y]);
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291 printf("\n");
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292 }
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293 if (memcmp(tmp[1], tests[x].pt, 16)) {
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294 printf("Plaintext: ");
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295 for (y = 0; y < 16; y++) printf("%02x ", tmp[0][y]);
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296 printf("\nExpected : ");
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297 for (y = 0; y < 16; y++) printf("%02x ", tests[x].pt[y]);
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298 printf("\n");
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299 }
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300 #endif
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301 return CRYPT_FAIL_TESTVECTOR;
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302 }
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303
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304 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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305 for (y = 0; y < 16; y++) tmp[0][y] = 0;
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306 for (y = 0; y < 1000; y++) rc6_ecb_encrypt(tmp[0], tmp[0], &key);
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307 for (y = 0; y < 1000; y++) rc6_ecb_decrypt(tmp[0], tmp[0], &key);
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308 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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309 }
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310 return CRYPT_OK;
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311 #endif
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312 }
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313
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314 /** Terminate the context
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315 @param skey The scheduled key
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316 */
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317 void rc6_done(symmetric_key *skey)
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318 {
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319 }
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320
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321 /**
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322 Gets suitable key size
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323 @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable.
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324 @return CRYPT_OK if the input key size is acceptable.
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325 */
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326 int rc6_keysize(int *keysize)
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327 {
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328 LTC_ARGCHK(keysize != NULL);
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329 if (*keysize < 8) {
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330 return CRYPT_INVALID_KEYSIZE;
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331 } else if (*keysize > 128) {
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332 *keysize = 128;
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333 }
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334 return CRYPT_OK;
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335 }
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336
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337 #endif /*RC6*/
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338
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339