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      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_encode_ia5_string.c
     15   ASN.1 DER, encode a IA5 STRING, Tom St Denis
     16 */
     17 
     18 #ifdef LTC_DER
     19 
     20 /**
     21   Store an IA5 STRING
     22   @param in       The array of IA5 to store (one per char)
     23   @param inlen    The number of IA5 to store
     24   @param out      [out] The destination for the DER encoded IA5 STRING
     25   @param outlen   [in/out] The max size and resulting size of the DER IA5 STRING
     26   @return CRYPT_OK if successful
     27 */
     28 int der_encode_ia5_string(const unsigned char *in, unsigned long inlen,
     29                                 unsigned char *out, unsigned long *outlen)
     30 {
     31    unsigned long x, y, len;
     32    int           err;
     33 
     34    LTC_ARGCHK(in     != NULL);
     35    LTC_ARGCHK(out    != NULL);
     36    LTC_ARGCHK(outlen != NULL);
     37 
     38    /* get the size */
     39    if ((err = der_length_ia5_string(in, inlen, &len)) != CRYPT_OK) {
     40       return err;
     41    }
     42 
     43    /* too big? */
     44    if (len > *outlen) {
     45       *outlen = len;
     46       return CRYPT_BUFFER_OVERFLOW;
     47    }
     48 
     49    /* encode the header+len */
     50    x = 0;
     51    out[x++] = 0x16;
     52    if (inlen < 128) {
     53       out[x++] = (unsigned char)inlen;
     54    } else if (inlen < 256) {
     55       out[x++] = 0x81;
     56       out[x++] = (unsigned char)inlen;
     57    } else if (inlen < 65536UL) {
     58       out[x++] = 0x82;
     59       out[x++] = (unsigned char)((inlen>>8)&255);
     60       out[x++] = (unsigned char)(inlen&255);
     61    } else if (inlen < 16777216UL) {
     62       out[x++] = 0x83;
     63       out[x++] = (unsigned char)((inlen>>16)&255);
     64       out[x++] = (unsigned char)((inlen>>8)&255);
     65       out[x++] = (unsigned char)(inlen&255);
     66    } else {
     67       return CRYPT_INVALID_ARG;
     68    }
     69 
     70    /* store octets */
     71    for (y = 0; y < inlen; y++) {
     72        out[x++] = der_ia5_char_encode(in[y]);
     73    }
     74 
     75    /* retun length */
     76    *outlen = x;
     77 
     78    return CRYPT_OK;
     79 }
     80 
     81 #endif
     82 
     83 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_encode_ia5_string.c,v $ */
     84 /* $Revision: 1.4 $ */
     85 /* $Date: 2006/12/04 21:34:03 $ */
     86