Mercurial > dropbear

annotate src/ciphers/noekeon.c @ 230:809b681a9af5 libtomcrypt

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- check for generic AES/TWOFISH settings from Dropbear, not AES128 etc
author Matt Johnston <matt@ucc.asn.au>
date Tue, 30 Aug 2005 17:40:30 +0000
parents 39d5d58461d6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 @file noekeon.c
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13 Implementation of the Noekeon block cipher by Tom St Denis
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14 */
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15 #include "tomcrypt.h"
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16
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17 #ifdef NOEKEON
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18
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19 const struct ltc_cipher_descriptor noekeon_desc =
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20 {
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21 "noekeon",
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22 16,
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23 16, 16, 16, 16,
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24 &noekeon_setup,
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25 &noekeon_ecb_encrypt,
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26 &noekeon_ecb_decrypt,
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27 &noekeon_test,
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28 &noekeon_done,
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29 &noekeon_keysize,
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30 NULL, NULL, NULL, NULL, NULL, NULL, NULL
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31 };
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32
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33 static const ulong32 RC[] = {
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34 0x00000080UL, 0x0000001bUL, 0x00000036UL, 0x0000006cUL,
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35 0x000000d8UL, 0x000000abUL, 0x0000004dUL, 0x0000009aUL,
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36 0x0000002fUL, 0x0000005eUL, 0x000000bcUL, 0x00000063UL,
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37 0x000000c6UL, 0x00000097UL, 0x00000035UL, 0x0000006aUL,
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38 0x000000d4UL
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39 };
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40
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41 #define kTHETA(a, b, c, d) \
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42 temp = a^c; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \
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43 b ^= temp; d ^= temp; \
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44 temp = b^d; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \
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45 a ^= temp; c ^= temp;
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46
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47 #define THETA(k, a, b, c, d) \
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48 temp = a^c; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \
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49 b ^= temp ^ k[1]; d ^= temp ^ k[3]; \
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50 temp = b^d; temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8); \
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51 a ^= temp ^ k[0]; c ^= temp ^ k[2];
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52
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53 #define GAMMA(a, b, c, d) \
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54 b ^= ~(d|c); \
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55 a ^= c&b; \
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56 temp = d; d = a; a = temp;\
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57 c ^= a ^ b ^ d; \
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58 b ^= ~(d|c); \
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59 a ^= c&b;
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60
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61 #define PI1(a, b, c, d) \
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62 a = ROLc(a, 1); c = ROLc(c, 5); d = ROLc(d, 2);
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63
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64 #define PI2(a, b, c, d) \
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65 a = RORc(a, 1); c = RORc(c, 5); d = RORc(d, 2);
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66
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67 /**
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68 Initialize the Noekeon block cipher
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69 @param key The symmetric key you wish to pass
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70 @param keylen The key length in bytes
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71 @param num_rounds The number of rounds desired (0 for default)
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72 @param skey The key in as scheduled by this function.
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73 @return CRYPT_OK if successful
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74 */
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75 int noekeon_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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76 {
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77 ulong32 temp;
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78
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79 LTC_ARGCHK(key != NULL);
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80 LTC_ARGCHK(skey != NULL);
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81
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82 if (keylen != 16) {
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83 return CRYPT_INVALID_KEYSIZE;
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84 }
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85
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86 if (num_rounds != 16 && num_rounds != 0) {
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87 return CRYPT_INVALID_ROUNDS;
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88 }
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89
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90 LOAD32H(skey->noekeon.K[0],&key[0]);
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91 LOAD32H(skey->noekeon.K[1],&key[4]);
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92 LOAD32H(skey->noekeon.K[2],&key[8]);
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93 LOAD32H(skey->noekeon.K[3],&key[12]);
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94
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95 LOAD32H(skey->noekeon.dK[0],&key[0]);
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96 LOAD32H(skey->noekeon.dK[1],&key[4]);
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97 LOAD32H(skey->noekeon.dK[2],&key[8]);
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98 LOAD32H(skey->noekeon.dK[3],&key[12]);
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99
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100 kTHETA(skey->noekeon.dK[0], skey->noekeon.dK[1], skey->noekeon.dK[2], skey->noekeon.dK[3]);
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101
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102 return CRYPT_OK;
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103 }
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104
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105 /**
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106 Encrypts a block of text with Noekeon
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107 @param pt The input plaintext (16 bytes)
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108 @param ct The output ciphertext (16 bytes)
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109 @param skey The key as scheduled
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110 */
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111 #ifdef LTC_CLEAN_STACK
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112 static void _noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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113 #else
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114 void noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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115 #endif
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116 {
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117 ulong32 a,b,c,d,temp;
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118 int r;
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119
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120 LTC_ARGCHK(skey != NULL);
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121 LTC_ARGCHK(pt != NULL);
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122 LTC_ARGCHK(ct != NULL);
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123
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124 LOAD32H(a,&pt[0]); LOAD32H(b,&pt[4]);
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125 LOAD32H(c,&pt[8]); LOAD32H(d,&pt[12]);
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126
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127 #define ROUND(i) \
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128 a ^= RC[i]; \
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129 THETA(skey->noekeon.K, a,b,c,d); \
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130 PI1(a,b,c,d); \
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131 GAMMA(a,b,c,d); \
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132 PI2(a,b,c,d);
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diff changeset
133
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diff changeset
134 for (r = 0; r < 16; ++r) {
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parents:
diff changeset
135 ROUND(r);
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parents:
diff changeset
136 }
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diff changeset
137
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
138 #undef ROUND
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diff changeset
139
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
140 a ^= RC[16];
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parents:
diff changeset
141 THETA(skey->noekeon.K, a, b, c, d);
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parents:
diff changeset
142
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diff changeset
143 STORE32H(a,&ct[0]); STORE32H(b,&ct[4]);
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parents:
diff changeset
144 STORE32H(c,&ct[8]); STORE32H(d,&ct[12]);
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parents:
diff changeset
145 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 #ifdef LTC_CLEAN_STACK
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parents:
diff changeset
148 void noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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diff changeset
149 {
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diff changeset
150 _noekeon_ecb_encrypt(pt, ct, skey);
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diff changeset
151 burn_stack(sizeof(ulong32) * 5 + sizeof(int));
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152 }
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diff changeset
153 #endif
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diff changeset
154
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 /**
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 Decrypts a block of text with Noekeon
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 @param ct The input ciphertext (16 bytes)
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diff changeset
158 @param pt The output plaintext (16 bytes)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 @param skey The key as scheduled
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
160 */
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parents:
diff changeset
161 #ifdef LTC_CLEAN_STACK
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diff changeset
162 static void _noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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diff changeset
163 #else
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diff changeset
164 void noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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diff changeset
165 #endif
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diff changeset
166 {
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diff changeset
167 ulong32 a,b,c,d, temp;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 int r;
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diff changeset
169
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 LTC_ARGCHK(skey != NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 LTC_ARGCHK(pt != NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 LTC_ARGCHK(ct != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173
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diff changeset
174 LOAD32H(a,&ct[0]); LOAD32H(b,&ct[4]);
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parents:
diff changeset
175 LOAD32H(c,&ct[8]); LOAD32H(d,&ct[12]);
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parents:
diff changeset
176
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 #define ROUND(i) \
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 THETA(skey->noekeon.dK, a,b,c,d); \
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diff changeset
180 a ^= RC[i]; \
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 PI1(a,b,c,d); \
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182 GAMMA(a,b,c,d); \
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 PI2(a,b,c,d);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 for (r = 16; r > 0; --r) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 ROUND(r);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 }
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diff changeset
188
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 #undef ROUND
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diff changeset
190
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 THETA(skey->noekeon.dK, a,b,c,d);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 a ^= RC[0];
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parents:
diff changeset
193 STORE32H(a,&pt[0]); STORE32H(b, &pt[4]);
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diff changeset
194 STORE32H(c,&pt[8]); STORE32H(d, &pt[12]);
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195 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
197 #ifdef LTC_CLEAN_STACK
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 void noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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diff changeset
199 {
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diff changeset
200 _noekeon_ecb_decrypt(ct, pt, skey);
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parents:
diff changeset
201 burn_stack(sizeof(ulong32) * 5 + sizeof(int));
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diff changeset
202 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 #endif
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diff changeset
204
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 /**
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parents:
diff changeset
206 Performs a self-test of the Noekeon block cipher
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parents:
diff changeset
207 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 int noekeon_test(void)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 #ifndef LTC_TEST
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parents:
diff changeset
212 return CRYPT_NOP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 #else
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 static const struct {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 int keylen;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 unsigned char key[16], pt[16], ct[16];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 } tests[] = {
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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 16,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 { 0x18, 0xa6, 0xec, 0xe5, 0x28, 0xaa, 0x79, 0x73,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 0x28, 0xb2, 0xc0, 0x91, 0xa0, 0x2f, 0x54, 0xc5}
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 };
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 symmetric_key key;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 unsigned char tmp[2][16];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 int err, i, y;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 zeromem(&key, sizeof(key));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 if ((err = noekeon_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 return err;
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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 noekeon_ecb_encrypt(tests[i].pt, tmp[0], &key);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 noekeon_ecb_decrypt(tmp[0], tmp[1], &key);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 if (memcmp(tmp[0], tests[i].ct, 16) || memcmp(tmp[1], tests[i].pt, 16)) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 #if 0
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 printf("\n\nTest %d failed\n", i);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 if (memcmp(tmp[0], tests[i].ct, 16)) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 printf("CT: ");
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 for (i = 0; i < 16; i++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 printf("%02x ", tmp[0][i]);
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 printf("\n");
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 printf("PT: ");
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 for (i = 0; i < 16; i++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 printf("%02x ", tmp[1][i]);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 printf("\n");
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 return CRYPT_FAIL_TESTVECTOR;
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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 for (y = 0; y < 16; y++) tmp[0][y] = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 for (y = 0; y < 1000; y++) noekeon_ecb_encrypt(tmp[0], tmp[0], &key);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 for (y = 0; y < 1000; y++) noekeon_ecb_decrypt(tmp[0], tmp[0], &key);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 return CRYPT_OK;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 /** Terminate the context
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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269 @param skey The scheduled key
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270 */
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271 void noekeon_done(symmetric_key *skey)
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272 {
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273 }
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274
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275 /**
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276 Gets suitable key size
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277 @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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278 @return CRYPT_OK if the input key size is acceptable.
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279 */
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280 int noekeon_keysize(int *keysize)
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281 {
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282 LTC_ARGCHK(keysize != NULL);
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283 if (*keysize < 16) {
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284 return CRYPT_INVALID_KEYSIZE;
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285 } else {
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286 *keysize = 16;
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287 return CRYPT_OK;
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288 }
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289 }
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290
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291 #endif
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292
209
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293
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294 /* $Source: /cvs/libtom/libtomcrypt/src/ciphers/noekeon.c,v $ */
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295 /* $Revision: 1.7 $ */
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296 /* $Date: 2005/05/05 14:35:58 $ */