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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt.h"
/**
@file der_decode_ia5_string.c
ASN.1 DER, encode a IA5 STRING, Tom St Denis
*/
#ifdef LTC_DER
/**
Store a IA5 STRING
@param in The DER encoded IA5 STRING
@param inlen The size of the DER IA5 STRING
@param out [out] The array of octets stored (one per char)
@param outlen [in/out] The number of octets stored
@return CRYPT_OK if successful
*/
int der_decode_ia5_string(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen)
{
unsigned long x, y, len;
int t;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
/* must have header at least */
if (inlen < 2) {
return CRYPT_INVALID_PACKET;
}
/* check for 0x16 */
if ((in[0] & 0x1F) != 0x16) {
return CRYPT_INVALID_PACKET;
}
x = 1;
/* decode the length */
if (in[x] & 0x80) {
/* valid # of bytes in length are 1,2,3 */
y = in[x] & 0x7F;
if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
return CRYPT_INVALID_PACKET;
}
/* read the length in */
len = 0;
++x;
while (y--) {
len = (len << 8) | in[x++];
}
} else {
len = in[x++] & 0x7F;
}
/* is it too long? */
if (len > *outlen) {
*outlen = len;
return CRYPT_BUFFER_OVERFLOW;
}
if (len + x > inlen) {
return CRYPT_INVALID_PACKET;
}
/* read the data */
for (y = 0; y < len; y++) {
t = der_ia5_value_decode(in[x++]);
if (t == -1) {
return CRYPT_INVALID_ARG;
}
out[y] = t;
}
*outlen = y;
return CRYPT_OK;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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