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_printable_string.c 15 ASN.1 DER, get length of Printable STRING, Tom St Denis 16 */ 17 18 #ifdef LTC_DER 19 20 static const struct { 21 int code, value; 22 } printable_table[] = { 23 { ' ', 32 }, 24 { '\'', 39 }, 25 { '(', 40 }, 26 { ')', 41 }, 27 { '+', 43 }, 28 { ',', 44 }, 29 { '-', 45 }, 30 { '.', 46 }, 31 { '/', 47 }, 32 { '0', 48 }, 33 { '1', 49 }, 34 { '2', 50 }, 35 { '3', 51 }, 36 { '4', 52 }, 37 { '5', 53 }, 38 { '6', 54 }, 39 { '7', 55 }, 40 { '8', 56 }, 41 { '9', 57 }, 42 { ':', 58 }, 43 { '=', 61 }, 44 { '?', 63 }, 45 { 'A', 65 }, 46 { 'B', 66 }, 47 { 'C', 67 }, 48 { 'D', 68 }, 49 { 'E', 69 }, 50 { 'F', 70 }, 51 { 'G', 71 }, 52 { 'H', 72 }, 53 { 'I', 73 }, 54 { 'J', 74 }, 55 { 'K', 75 }, 56 { 'L', 76 }, 57 { 'M', 77 }, 58 { 'N', 78 }, 59 { 'O', 79 }, 60 { 'P', 80 }, 61 { 'Q', 81 }, 62 { 'R', 82 }, 63 { 'S', 83 }, 64 { 'T', 84 }, 65 { 'U', 85 }, 66 { 'V', 86 }, 67 { 'W', 87 }, 68 { 'X', 88 }, 69 { 'Y', 89 }, 70 { 'Z', 90 }, 71 { 'a', 97 }, 72 { 'b', 98 }, 73 { 'c', 99 }, 74 { 'd', 100 }, 75 { 'e', 101 }, 76 { 'f', 102 }, 77 { 'g', 103 }, 78 { 'h', 104 }, 79 { 'i', 105 }, 80 { 'j', 106 }, 81 { 'k', 107 }, 82 { 'l', 108 }, 83 { 'm', 109 }, 84 { 'n', 110 }, 85 { 'o', 111 }, 86 { 'p', 112 }, 87 { 'q', 113 }, 88 { 'r', 114 }, 89 { 's', 115 }, 90 { 't', 116 }, 91 { 'u', 117 }, 92 { 'v', 118 }, 93 { 'w', 119 }, 94 { 'x', 120 }, 95 { 'y', 121 }, 96 { 'z', 122 }, 97 }; 98 99 int der_printable_char_encode(int c) 100 { 101 int x; 102 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) { 103 if (printable_table[x].code == c) { 104 return printable_table[x].value; 105 } 106 } 107 return -1; 108 } 109 110 int der_printable_value_decode(int v) 111 { 112 int x; 113 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) { 114 if (printable_table[x].value == v) { 115 return printable_table[x].code; 116 } 117 } 118 return -1; 119 } 120 121 /** 122 Gets length of DER encoding of Printable STRING 123 @param octets The values you want to encode 124 @param noctets The number of octets in the string to encode 125 @param outlen [out] The length of the DER encoding for the given string 126 @return CRYPT_OK if successful 127 */ 128 int der_length_printable_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen) 129 { 130 unsigned long x; 131 132 LTC_ARGCHK(outlen != NULL); 133 LTC_ARGCHK(octets != NULL); 134 135 /* scan string for validity */ 136 for (x = 0; x < noctets; x++) { 137 if (der_printable_char_encode(octets[x]) == -1) { 138 return CRYPT_INVALID_ARG; 139 } 140 } 141 142 if (noctets < 128) { 143 /* 16 LL DD DD DD ... */ 144 *outlen = 2 + noctets; 145 } else if (noctets < 256) { 146 /* 16 81 LL DD DD DD ... */ 147 *outlen = 3 + noctets; 148 } else if (noctets < 65536UL) { 149 /* 16 82 LL LL DD DD DD ... */ 150 *outlen = 4 + noctets; 151 } else if (noctets < 16777216UL) { 152 /* 16 83 LL LL LL DD DD DD ... */ 153 *outlen = 5 + noctets; 154 } else { 155 return CRYPT_INVALID_ARG; 156 } 157 158 return CRYPT_OK; 159 } 160 161 #endif 162 163 164 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c,v $ */ 165 /* $Revision: 1.2 $ */ 166 /* $Date: 2006/03/31 14:15:35 $ */ 167
