1/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2 * 3 * LibTomCrypt is a library that provides various cryptographic 4 * algorithms in a highly modular and flexible manner. 5 * 6 * The library is free for all purposes without any express 7 * guarantee it works. 8 * 9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10 */ 11#include "tomcrypt.h" 12 13/** 14 @file der_length_ia5_string.c 15 ASN.1 DER, get length of IA5 STRING, Tom St Denis 16*/ 17 18#ifdef LTC_DER 19 20static const struct { 21 int code, value; 22} ia5_table[] = { 23{ '\0', 0 }, 24{ '\a', 7 }, 25{ '\b', 8 }, 26{ '\t', 9 }, 27{ '\n', 10 }, 28{ '\f', 12 }, 29{ '\r', 13 }, 30{ ' ', 32 }, 31{ '!', 33 }, 32{ '"', 34 }, 33{ '#', 35 }, 34{ '$', 36 }, 35{ '%', 37 }, 36{ '&', 38 }, 37{ '\'', 39 }, 38{ '(', 40 }, 39{ ')', 41 }, 40{ '*', 42 }, 41{ '+', 43 }, 42{ ',', 44 }, 43{ '-', 45 }, 44{ '.', 46 }, 45{ '/', 47 }, 46{ '0', 48 }, 47{ '1', 49 }, 48{ '2', 50 }, 49{ '3', 51 }, 50{ '4', 52 }, 51{ '5', 53 }, 52{ '6', 54 }, 53{ '7', 55 }, 54{ '8', 56 }, 55{ '9', 57 }, 56{ ':', 58 }, 57{ ';', 59 }, 58{ '<', 60 }, 59{ '=', 61 }, 60{ '>', 62 }, 61{ '?', 63 }, 62{ '@', 64 }, 63{ 'A', 65 }, 64{ 'B', 66 }, 65{ 'C', 67 }, 66{ 'D', 68 }, 67{ 'E', 69 }, 68{ 'F', 70 }, 69{ 'G', 71 }, 70{ 'H', 72 }, 71{ 'I', 73 }, 72{ 'J', 74 }, 73{ 'K', 75 }, 74{ 'L', 76 }, 75{ 'M', 77 }, 76{ 'N', 78 }, 77{ 'O', 79 }, 78{ 'P', 80 }, 79{ 'Q', 81 }, 80{ 'R', 82 }, 81{ 'S', 83 }, 82{ 'T', 84 }, 83{ 'U', 85 }, 84{ 'V', 86 }, 85{ 'W', 87 }, 86{ 'X', 88 }, 87{ 'Y', 89 }, 88{ 'Z', 90 }, 89{ '[', 91 }, 90{ '\\', 92 }, 91{ ']', 93 }, 92{ '^', 94 }, 93{ '_', 95 }, 94{ '`', 96 }, 95{ 'a', 97 }, 96{ 'b', 98 }, 97{ 'c', 99 }, 98{ 'd', 100 }, 99{ 'e', 101 }, 100{ 'f', 102 }, 101{ 'g', 103 }, 102{ 'h', 104 }, 103{ 'i', 105 }, 104{ 'j', 106 }, 105{ 'k', 107 }, 106{ 'l', 108 }, 107{ 'm', 109 }, 108{ 'n', 110 }, 109{ 'o', 111 }, 110{ 'p', 112 }, 111{ 'q', 113 }, 112{ 'r', 114 }, 113{ 's', 115 }, 114{ 't', 116 }, 115{ 'u', 117 }, 116{ 'v', 118 }, 117{ 'w', 119 }, 118{ 'x', 120 }, 119{ 'y', 121 }, 120{ 'z', 122 }, 121{ '{', 123 }, 122{ '|', 124 }, 123{ '}', 125 }, 124{ '~', 126 } 125}; 126 127int der_ia5_char_encode(int c) 128{ 129 int x; 130 for (x = 0; x < (int)(sizeof(ia5_table)/sizeof(ia5_table[0])); x++) { 131 if (ia5_table[x].code == c) { 132 return ia5_table[x].value; 133 } 134 } 135 return -1; 136} 137 138int der_ia5_value_decode(int v) 139{ 140 int x; 141 for (x = 0; x < (int)(sizeof(ia5_table)/sizeof(ia5_table[0])); x++) { 142 if (ia5_table[x].value == v) { 143 return ia5_table[x].code; 144 } 145 } 146 return -1; 147} 148 149/** 150 Gets length of DER encoding of IA5 STRING 151 @param octets The values you want to encode 152 @param noctets The number of octets in the string to encode 153 @param outlen [out] The length of the DER encoding for the given string 154 @return CRYPT_OK if successful 155*/ 156int der_length_ia5_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen) 157{ 158 unsigned long x; 159 160 LTC_ARGCHK(outlen != NULL); 161 LTC_ARGCHK(octets != NULL); 162 163 /* scan string for validity */ 164 for (x = 0; x < noctets; x++) { 165 if (der_ia5_char_encode(octets[x]) == -1) { 166 return CRYPT_INVALID_ARG; 167 } 168 } 169 170 if (noctets < 128) { 171 /* 16 LL DD DD DD ... */ 172 *outlen = 2 + noctets; 173 } else if (noctets < 256) { 174 /* 16 81 LL DD DD DD ... */ 175 *outlen = 3 + noctets; 176 } else if (noctets < 65536UL) { 177 /* 16 82 LL LL DD DD DD ... */ 178 *outlen = 4 + noctets; 179 } else if (noctets < 16777216UL) { 180 /* 16 83 LL LL LL DD DD DD ... */ 181 *outlen = 5 + noctets; 182 } else { 183 return CRYPT_INVALID_ARG; 184 } 185 186 return CRYPT_OK; 187} 188 189#endif 190 191 192/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_string.c,v $ */ 193/* $Revision: 1.2 $ */ 194/* $Date: 2006/03/31 14:15:35 $ */ 195