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annotate src/ciphers/rc2.c @ 209:39d5d58461d6 libtomcrypt-orig LTC_1.05

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Import of libtomcrypt 1.05
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 03:53:40 +0000
parents 1c15b283127b
children
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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 * To commemorate the 1996 RSA Data Security Conference, the following *
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13 * code is released into the public domain by its author. Prost! *
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14 * *
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15 * This cipher uses 16-bit words and little-endian byte ordering. *
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16 * I wonder which processor it was optimized for? *
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17 * *
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18 * Thanks to CodeView, SoftIce, and D86 for helping bring this code to *
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19 * the public. *
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20 \**********************************************************************/
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21 #include <tomcrypt.h>
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22
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23 /**
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24 @file rc2.c
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25 Implementation of RC2
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26 */
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27
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28 #ifdef RC2
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29
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30 const struct ltc_cipher_descriptor rc2_desc = {
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31 "rc2",
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32 12, 8, 128, 8, 16,
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33 &rc2_setup,
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34 &rc2_ecb_encrypt,
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35 &rc2_ecb_decrypt,
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36 &rc2_test,
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37 &rc2_done,
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38 &rc2_keysize,
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39 NULL, NULL, NULL, NULL, NULL, NULL, NULL
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40 };
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41
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42 /* 256-entry permutation table, probably derived somehow from pi */
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43 static const unsigned char permute[256] = {
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44 217,120,249,196, 25,221,181,237, 40,233,253,121, 74,160,216,157,
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45 198,126, 55,131, 43,118, 83,142, 98, 76,100,136, 68,139,251,162,
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46 23,154, 89,245,135,179, 79, 19, 97, 69,109,141, 9,129,125, 50,
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47 189,143, 64,235,134,183,123, 11,240,149, 33, 34, 92,107, 78,130,
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48 84,214,101,147,206, 96,178, 28,115, 86,192, 20,167,140,241,220,
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49 18,117,202, 31, 59,190,228,209, 66, 61,212, 48,163, 60,182, 38,
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50 111,191, 14,218, 70,105, 7, 87, 39,242, 29,155,188,148, 67, 3,
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51 248, 17,199,246,144,239, 62,231, 6,195,213, 47,200,102, 30,215,
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52 8,232,234,222,128, 82,238,247,132,170,114,172, 53, 77,106, 42,
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53 150, 26,210,113, 90, 21, 73,116, 75,159,208, 94, 4, 24,164,236,
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54 194,224, 65,110, 15, 81,203,204, 36,145,175, 80,161,244,112, 57,
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55 153,124, 58,133, 35,184,180,122,252, 2, 54, 91, 37, 85,151, 49,
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56 45, 93,250,152,227,138,146,174, 5,223, 41, 16,103,108,186,201,
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57 211, 0,230,207,225,158,168, 44, 99, 22, 1, 63, 88,226,137,169,
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58 13, 56, 52, 27,171, 51,255,176,187, 72, 12, 95,185,177,205, 46,
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59 197,243,219, 71,229,165,156,119, 10,166, 32,104,254,127,193,173
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60 };
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61
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62 /**
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63 Initialize the RC2 block cipher
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64 @param key The symmetric key you wish to pass
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65 @param keylen The key length in bytes
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66 @param num_rounds The number of rounds desired (0 for default)
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67 @param skey The key in as scheduled by this function.
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68 @return CRYPT_OK if successful
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69 */
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70 int rc2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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71 {
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72 unsigned *xkey = skey->rc2.xkey;
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73 unsigned char tmp[128];
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74 unsigned T8, TM;
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75 int i, bits;
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76
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77 LTC_ARGCHK(key != NULL);
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78 LTC_ARGCHK(skey != NULL);
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79
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80 if (keylen < 8 || keylen > 128) {
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81 return CRYPT_INVALID_KEYSIZE;
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82 }
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83
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84 if (num_rounds != 0 && num_rounds != 16) {
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85 return CRYPT_INVALID_ROUNDS;
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86 }
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87
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88 for (i = 0; i < keylen; i++) {
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89 tmp[i] = key[i] & 255;
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90 }
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91
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92 /* Phase 1: Expand input key to 128 bytes */
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93 if (keylen < 128) {
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94 for (i = keylen; i < 128; i++) {
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95 tmp[i] = permute[(tmp[i - 1] + tmp[i - keylen]) & 255];
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96 }
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97 }
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98
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99 /* Phase 2 - reduce effective key size to "bits" */
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100 bits = keylen<<3;
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101 T8 = (unsigned)(bits+7)>>3;
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102 TM = (255 >> (unsigned)(7 & -bits));
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103 tmp[128 - T8] = permute[tmp[128 - T8] & TM];
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104 for (i = 127 - T8; i >= 0; i--) {
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105 tmp[i] = permute[tmp[i + 1] ^ tmp[i + T8]];
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106 }
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107
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108 /* Phase 3 - copy to xkey in little-endian order */
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109 for (i = 0; i < 64; i++) {
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110 xkey[i] = (unsigned)tmp[2*i] + ((unsigned)tmp[2*i+1] << 8);
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111 }
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112
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113 #ifdef LTC_CLEAN_STACK
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114 zeromem(tmp, sizeof(tmp));
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115 #endif
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116
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117 return CRYPT_OK;
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118 }
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119
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120 /**********************************************************************\
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121 * Encrypt an 8-byte block of plaintext using the given key. *
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122 \**********************************************************************/
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123 /**
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124 Encrypts a block of text with RC2
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125 @param pt The input plaintext (8 bytes)
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126 @param ct The output ciphertext (8 bytes)
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127 @param skey The key as scheduled
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128 */
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129 #ifdef LTC_CLEAN_STACK
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130 static void _rc2_ecb_encrypt( const unsigned char *pt,
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131 unsigned char *ct,
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132 symmetric_key *skey)
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diff changeset
133 #else
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diff changeset
134 void rc2_ecb_encrypt( const unsigned char *pt,
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diff changeset
135 unsigned char *ct,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
136 symmetric_key *skey)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
137 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
138 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139 unsigned *xkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
140 unsigned x76, x54, x32, x10, i;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
141
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
142 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
143 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
144 LTC_ARGCHK(skey != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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 xkey = skey->rc2.xkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
148 x76 = ((unsigned)pt[7] << 8) + (unsigned)pt[6];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
149 x54 = ((unsigned)pt[5] << 8) + (unsigned)pt[4];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
150 x32 = ((unsigned)pt[3] << 8) + (unsigned)pt[2];
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parents:
diff changeset
151 x10 = ((unsigned)pt[1] << 8) + (unsigned)pt[0];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 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
154 x10 = (x10 + (x32 & ~x76) + (x54 & x76) + xkey[4*i+0]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 x10 = ((x10 << 1) | (x10 >> 15));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 x32 = (x32 + (x54 & ~x10) + (x76 & x10) + xkey[4*i+1]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 x32 = ((x32 << 2) | (x32 >> 14));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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diff changeset
160 x54 = (x54 + (x76 & ~x32) + (x10 & x32) + xkey[4*i+2]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
161 x54 = ((x54 << 3) | (x54 >> 13));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
162
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
163 x76 = (x76 + (x10 & ~x54) + (x32 & x54) + xkey[4*i+3]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
164 x76 = ((x76 << 5) | (x76 >> 11));
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parents:
diff changeset
165
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 if (i == 4 || i == 10) {
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parents:
diff changeset
167 x10 = (x10 + xkey[x76 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
168 x32 = (x32 + xkey[x10 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
169 x54 = (x54 + xkey[x32 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
170 x76 = (x76 + xkey[x54 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 ct[0] = (unsigned char)x10;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 ct[1] = (unsigned char)(x10 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 ct[2] = (unsigned char)x32;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 ct[3] = (unsigned char)(x32 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 ct[4] = (unsigned char)x54;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 ct[5] = (unsigned char)(x54 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 ct[6] = (unsigned char)x76;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 ct[7] = (unsigned char)(x76 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 #ifdef LTC_CLEAN_STACK
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 void rc2_ecb_encrypt( const unsigned char *pt,
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parents:
diff changeset
186 unsigned char *ct,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 symmetric_key *skey)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
189 _rc2_ecb_encrypt(pt, ct, skey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
190 burn_stack(sizeof(unsigned *) + sizeof(unsigned) * 5);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 #endif
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
193
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
194 /**********************************************************************\
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
195 * Decrypt an 8-byte block of ciphertext using the given key. *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
diff changeset
196 \**********************************************************************/
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197 /**
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 Decrypts a block of text with RC2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 @param ct The input ciphertext (8 bytes)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 @param pt The output plaintext (8 bytes)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 @param skey The key as scheduled
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 #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
204 static void _rc2_ecb_decrypt( const unsigned char *ct,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 unsigned char *pt,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 symmetric_key *skey)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 #else
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 void rc2_ecb_decrypt( const unsigned char *ct,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 unsigned char *pt,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 symmetric_key *skey)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 unsigned x76, x54, x32, x10;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 unsigned *xkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 int i;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 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
218 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
219 LTC_ARGCHK(skey != NULL);
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 xkey = skey->rc2.xkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 x76 = ((unsigned)ct[7] << 8) + (unsigned)ct[6];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 x54 = ((unsigned)ct[5] << 8) + (unsigned)ct[4];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 x32 = ((unsigned)ct[3] << 8) + (unsigned)ct[2];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 x10 = ((unsigned)ct[1] << 8) + (unsigned)ct[0];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 for (i = 15; i >= 0; i--) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 if (i == 4 || i == 10) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 x76 = (x76 - xkey[x54 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 x54 = (x54 - xkey[x32 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 x32 = (x32 - xkey[x10 & 63]) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 x10 = (x10 - xkey[x76 & 63]) & 0xFFFF;
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 x76 = ((x76 << 11) | (x76 >> 5));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 x76 = (x76 - ((x10 & ~x54) + (x32 & x54) + xkey[4*i+3])) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 x54 = ((x54 << 13) | (x54 >> 3));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 x54 = (x54 - ((x76 & ~x32) + (x10 & x32) + xkey[4*i+2])) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 x32 = ((x32 << 14) | (x32 >> 2));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 x32 = (x32 - ((x54 & ~x10) + (x76 & x10) + xkey[4*i+1])) & 0xFFFF;
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 x10 = ((x10 << 15) | (x10 >> 1));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 x10 = (x10 - ((x32 & ~x76) + (x54 & x76) + xkey[4*i+0])) & 0xFFFF;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 pt[0] = (unsigned char)x10;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 pt[1] = (unsigned char)(x10 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 pt[2] = (unsigned char)x32;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 pt[3] = (unsigned char)(x32 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 pt[4] = (unsigned char)x54;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 pt[5] = (unsigned char)(x54 >> 8);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 pt[6] = (unsigned char)x76;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 pt[7] = (unsigned char)(x76 >> 8);
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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 #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
260 void rc2_ecb_decrypt( const unsigned char *ct,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 unsigned char *pt,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 symmetric_key *skey)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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 _rc2_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
265 burn_stack(sizeof(unsigned *) + sizeof(unsigned) * 4 + sizeof(int));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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266 }
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267 #endif
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268
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269 /**
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270 Performs a self-test of the RC2 block cipher
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271 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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272 */
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273 int rc2_test(void)
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274 {
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275 #ifndef LTC_TEST
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276 return CRYPT_NOP;
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277 #else
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278 static const struct {
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279 int keylen;
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280 unsigned char key[16], pt[8], ct[8];
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281 } tests[] = {
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282
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283 { 8,
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284 { 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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285 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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286 { 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 },
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287 { 0x30, 0x64, 0x9e, 0xdf, 0x9b, 0xe7, 0xd2, 0xc2 }
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288
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289 },
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290 { 16,
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291 { 0x88, 0xbc, 0xa9, 0x0e, 0x90, 0x87, 0x5a, 0x7f,
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292 0x0f, 0x79, 0xc3, 0x84, 0x62, 0x7b, 0xaf, 0xb2 },
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293 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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294 { 0x22, 0x69, 0x55, 0x2a, 0xb0, 0xf8, 0x5c, 0xa6 }
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295 }
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296 };
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297 int x, y, err;
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298 symmetric_key skey;
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299 unsigned char tmp[2][8];
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300
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301 for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
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302 zeromem(tmp, sizeof(tmp));
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303 if ((err = rc2_setup(tests[x].key, tests[x].keylen, 0, &skey)) != CRYPT_OK) {
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304 return err;
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305 }
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306
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307 rc2_ecb_encrypt(tests[x].pt, tmp[0], &skey);
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308 rc2_ecb_decrypt(tmp[0], tmp[1], &skey);
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309
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310 if (memcmp(tmp[0], tests[x].ct, 8) != 0 || memcmp(tmp[1], tests[x].pt, 8) != 0) {
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311 return CRYPT_FAIL_TESTVECTOR;
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312 }
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313
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314 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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315 for (y = 0; y < 8; y++) tmp[0][y] = 0;
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316 for (y = 0; y < 1000; y++) rc2_ecb_encrypt(tmp[0], tmp[0], &skey);
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317 for (y = 0; y < 1000; y++) rc2_ecb_decrypt(tmp[0], tmp[0], &skey);
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318 for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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319 }
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320 return CRYPT_OK;
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321 #endif
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322 }
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323
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324 /** Terminate the context
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325 @param skey The scheduled key
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326 */
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327 void rc2_done(symmetric_key *skey)
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328 {
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329 }
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330
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331 /**
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332 Gets suitable key size
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333 @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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334 @return CRYPT_OK if the input key size is acceptable.
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335 */
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336 int rc2_keysize(int *keysize)
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337 {
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338 LTC_ARGCHK(keysize != NULL);
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339 if (*keysize < 8) {
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340 return CRYPT_INVALID_KEYSIZE;
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341 } else if (*keysize > 128) {
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342 *keysize = 128;
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343 }
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344 return CRYPT_OK;
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345 }
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346
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347 #endif
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348
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349
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350
209
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351
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352 /* $Source: /cvs/libtom/libtomcrypt/src/ciphers/rc2.c,v $ */
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353 /* $Revision: 1.7 $ */
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354 /* $Date: 2005/05/05 14:35:58 $ */