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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
#include "tomcrypt_private.h"
/**
@file der_decode_teletex_string.c
ASN.1 DER, encode a teletex STRING
*/
#ifdef LTC_DER
/**
Store a teletex STRING
@param in The DER encoded teletex STRING
@param inlen The size of the DER teletex 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_teletex_string(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen)
{
unsigned long x, y, len;
int t, err;
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 0x14 */
if ((in[0] & 0x1F) != 0x14) {
return CRYPT_INVALID_PACKET;
}
x = 1;
/* get the length of the data */
y = inlen - x;
if ((err = der_decode_asn1_length(in + x, &y, &len)) != CRYPT_OK) {
return err;
}
x += y;
/* is it too long? */
if (len > *outlen) {
*outlen = len;
return CRYPT_BUFFER_OVERFLOW;
}
if (len > (inlen - x)) {
return CRYPT_INVALID_PACKET;
}
/* read the data */
for (y = 0; y < len; y++) {
t = der_teletex_value_decode(in[x++]);
if (t == -1) {
return CRYPT_INVALID_ARG;
}
out[y] = t;
}
*outlen = y;
return CRYPT_OK;
}
#endif
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