Mercurial > dropbear

annotate libtomcrypt/src/ciphers/rc2.c @ 1898:3f87f7ff1092

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Fix building with DEBUG_TRACE = 0 Also try a less repetitive way of specifying macros
author Matt Johnston <matt@ucc.asn.au>
date Tue, 22 Mar 2022 23:29:38 +0800
parents 6dba84798cd5
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 /**********************************************************************\
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10 * To commemorate the 1996 RSA Data Security Conference, the following *
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11 * code is released into the public domain by its author. Prost! *
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12 * *
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13 * This cipher uses 16-bit words and little-endian byte ordering. *
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14 * I wonder which processor it was optimized for? *
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15 * *
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16 * Thanks to CodeView, SoftIce, and D86 for helping bring this code to *
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17 * the public. *
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18 \**********************************************************************/
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19 #include "tomcrypt.h"
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20
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21 /**
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22 @file rc2.c
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23 Implementation of RC2 with fixed effective key length of 64bits
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24 */
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25
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26 #ifdef LTC_RC2
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27
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28 const struct ltc_cipher_descriptor rc2_desc = {
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29 "rc2",
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30 12, 8, 128, 8, 16,
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31 &rc2_setup,
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32 &rc2_ecb_encrypt,
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33 &rc2_ecb_decrypt,
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34 &rc2_test,
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35 &rc2_done,
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36 &rc2_keysize,
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37 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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38 };
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39
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40 /* 256-entry permutation table, probably derived somehow from pi */
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41 static const unsigned char permute[256] = {
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42 217,120,249,196, 25,221,181,237, 40,233,253,121, 74,160,216,157,
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43 198,126, 55,131, 43,118, 83,142, 98, 76,100,136, 68,139,251,162,
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44 23,154, 89,245,135,179, 79, 19, 97, 69,109,141, 9,129,125, 50,
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45 189,143, 64,235,134,183,123, 11,240,149, 33, 34, 92,107, 78,130,
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46 84,214,101,147,206, 96,178, 28,115, 86,192, 20,167,140,241,220,
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47 18,117,202, 31, 59,190,228,209, 66, 61,212, 48,163, 60,182, 38,
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48 111,191, 14,218, 70,105, 7, 87, 39,242, 29,155,188,148, 67, 3,
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49 248, 17,199,246,144,239, 62,231, 6,195,213, 47,200,102, 30,215,
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50 8,232,234,222,128, 82,238,247,132,170,114,172, 53, 77,106, 42,
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51 150, 26,210,113, 90, 21, 73,116, 75,159,208, 94, 4, 24,164,236,
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52 194,224, 65,110, 15, 81,203,204, 36,145,175, 80,161,244,112, 57,
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53 153,124, 58,133, 35,184,180,122,252, 2, 54, 91, 37, 85,151, 49,
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54 45, 93,250,152,227,138,146,174, 5,223, 41, 16,103,108,186,201,
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55 211, 0,230,207,225,158,168, 44, 99, 22, 1, 63, 88,226,137,169,
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56 13, 56, 52, 27,171, 51,255,176,187, 72, 12, 95,185,177,205, 46,
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57 197,243,219, 71,229,165,156,119, 10,166, 32,104,254,127,193,173
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58 };
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59
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60 /**
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61 Initialize the RC2 block cipher
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62 @param key The symmetric key you wish to pass
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63 @param keylen The key length in bytes
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64 @param bits The effective key length in bits
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65 @param num_rounds The number of rounds desired (0 for default)
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66 @param skey The key in as scheduled by this function.
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67 @return CRYPT_OK if successful
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68 */
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69 int rc2_setup_ex(const unsigned char *key, int keylen, int bits, int num_rounds, symmetric_key *skey)
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70 {
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71 unsigned *xkey = skey->rc2.xkey;
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72 unsigned char tmp[128];
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73 unsigned T8, TM;
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74 int i;
285
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75
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76 LTC_ARGCHK(key != NULL);
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77 LTC_ARGCHK(skey != NULL);
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78
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79 if (keylen == 0 || keylen > 128 || bits > 1024) {
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80 return CRYPT_INVALID_KEYSIZE;
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81 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 if (bits == 0) {
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83 bits = 1024;
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84 }
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85
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86 if (num_rounds != 0 && num_rounds != 16) {
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87 return CRYPT_INVALID_ROUNDS;
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88 }
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89
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90 for (i = 0; i < keylen; i++) {
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91 tmp[i] = key[i] & 255;
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92 }
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93
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94 /* Phase 1: Expand input key to 128 bytes */
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95 if (keylen < 128) {
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96 for (i = keylen; i < 128; i++) {
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97 tmp[i] = permute[(tmp[i - 1] + tmp[i - keylen]) & 255];
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98 }
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99 }
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100
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101 /* Phase 2 - reduce effective key size to "bits" */
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102 T8 = (unsigned)(bits+7)>>3;
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103 TM = (255 >> (unsigned)(7 & -bits));
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104 tmp[128 - T8] = permute[tmp[128 - T8] & TM];
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105 for (i = 127 - T8; i >= 0; i--) {
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106 tmp[i] = permute[tmp[i + 1] ^ tmp[i + T8]];
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107 }
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108
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109 /* Phase 3 - copy to xkey in little-endian order */
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110 for (i = 0; i < 64; i++) {
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111 xkey[i] = (unsigned)tmp[2*i] + ((unsigned)tmp[2*i+1] << 8);
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112 }
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113
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114 #ifdef LTC_CLEAN_STACK
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115 zeromem(tmp, sizeof(tmp));
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116 #endif
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117
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118 return CRYPT_OK;
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119 }
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120
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121 /**
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122 Initialize the RC2 block cipher
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123
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124 The effective key length is here always keylen * 8
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125
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126 @param key The symmetric key you wish to pass
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127 @param keylen The key length in bytes
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128 @param num_rounds The number of rounds desired (0 for default)
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129 @param skey The key in as scheduled by this function.
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130 @return CRYPT_OK if successful
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131 */
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132 int rc2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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