1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
6 * The library is free for all purposes without any express
9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
14 @file der_decode_ia5_string.c
15 ASN.1 DER, encode a IA5 STRING, Tom St Denis
23 @param in The DER encoded IA5 STRING
24 @param inlen The size of the DER IA5 STRING
25 @param out [out] The array of octets stored (one per char)
26 @param outlen [in/out] The number of octets stored
27 @return CRYPT_OK if successful
29 int der_decode_ia5_string(const unsigned char *in, unsigned long inlen,
30 unsigned char *out, unsigned long *outlen)
32 unsigned long x, y, len;
35 LTC_ARGCHK(in != NULL);
36 LTC_ARGCHK(out != NULL);
37 LTC_ARGCHK(outlen != NULL);
39 /* must have header at least */
41 return CRYPT_INVALID_PACKET;
45 if ((in[0] & 0x1F) != 0x16) {
46 return CRYPT_INVALID_PACKET;
50 /* decode the length */
52 /* valid # of bytes in length are 1,2,3 */
54 if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
55 return CRYPT_INVALID_PACKET;
58 /* read the length in */
62 len = (len << 8) | in[x++];
71 return CRYPT_BUFFER_OVERFLOW;
74 if (len + x > inlen) {
75 return CRYPT_INVALID_PACKET;
79 for (y = 0; y < len; y++) {
80 t = der_ia5_value_decode(in[x++]);
82 return CRYPT_INVALID_ARG;
94 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_decode_ia5_string.c,v $ */
95 /* $Revision: 1.3 $ */
96 /* $Date: 2006/06/16 21:53:41 $ */