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 (at) 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 20 static 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 }; 126 127 int 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 } 137 138 int 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 */ 156 int 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
