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/*
* Copyright (C) 2011 Free Software Foundation, Inc.
*
* This file is part of LIBTASN1.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Written by Simon Josefsson
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "libtasn1.h"
struct tv
{
int bitlen;
const char *bitstr;
int derlen;
const char *der;
};
static const struct tv tv[] = {
{ 0, "", 2, "\x01\x00" },
{ 1, "\x00", 3, "\x02\x07\x00" },
{ 2, "\x00", 3, "\x02\x06\x00" },
{ 3, "\x00", 3, "\x02\x05\x00" },
{ 4, "\x00", 3, "\x02\x04\x00" },
{ 5, "\x00", 3, "\x02\x03\x00" },
{ 6, "\x00", 3, "\x02\x02\x00" },
{ 7, "\x00", 3, "\x02\x01\x00" },
{ 8, "\x00\x00", 3, "\x02\x00\x00" },
{ 9, "\x00\x00", 4, "\x03\x07\x00\x00" },
{ 10, "\x00\x00", 4, "\x03\x06\x00\x00" },
{ 11, "\x00\x00", 4, "\x03\x05\x00\x00" },
{ 12, "\x00\x00", 4, "\x03\x04\x00\x00" },
{ 13, "\x00\x00", 4, "\x03\x03\x00\x00" },
{ 14, "\x00\x00", 4, "\x03\x02\x00\x00" },
{ 15, "\x00\x00", 4, "\x03\x01\x00\x00" },
{ 16, "\x00\x00", 4, "\x03\x00\x00\x00" },
{ 17, "\x00\x00\x00", 5, "\x04\x07\x00\x00\x00" },
{ 18, "\x00\x00\x00", 5, "\x04\x06\x00\x00\x00" },
{ 19, "\x00\x00\x00", 5, "\x04\x05\x00\x00\x00" },
{ 1, "\xFF", 3, "\x02\x07\x80" },
{ 2, "\xFF", 3, "\x02\x06\xc0" },
{ 3, "\xFF", 3, "\x02\x05\xe0" },
{ 4, "\xFF", 3, "\x02\x04\xf0" },
{ 5, "\xFF", 3, "\x02\x03\xf8" },
{ 6, "\xFF", 3, "\x02\x02\xfc" },
{ 7, "\xFF", 3, "\x02\x01\xfe" },
{ 8, "\xFF\xFF", 3, "\x02\x00\xff" },
{ 9, "\xFF\xFF", 4, "\x03\x07\xff\x80" },
{ 10, "\xFF\xFF", 4, "\x03\x06\xff\xc0" },
{ 11, "\xFF\xFF", 4, "\x03\x05\xff\xe0" },
{ 12, "\xFF\xFF", 4, "\x03\x04\xff\xf0" },
{ 13, "\xFF\xFF", 4, "\x03\x03\xff\xf8" },
{ 14, "\xFF\xFF", 4, "\x03\x02\xff\xfc" },
{ 15, "\xFF\xFF", 4, "\x03\x01\xff\xfe" },
{ 16, "\xFF\xFF", 4, "\x03\x00\xff\xff" },
{ 17, "\xFF\xFF\xFF", 5, "\x04\x07\xff\xff\x80" },
{ 18, "\xFF\xFF\xFF", 5, "\x04\x06\xff\xff\xc0" },
{ 19, "\xFF\xFF\xFF", 5, "\x04\x05\xff\xff\xe0" },
};
int
main (int argc, char *argv[])
{
asn1_retCode result;
unsigned char der[100];
unsigned char str[100];
int der_len = sizeof (der);
int str_size = sizeof (str);
int ret_len, bit_len;
size_t i;
/* Dummy test */
asn1_bit_der (NULL, 0, der, &der_len);
result = asn1_get_bit_der (der, 0, &ret_len, str, str_size, &bit_len);
if (result != ASN1_GENERIC_ERROR)
{
fprintf (stderr, "asn1_get_bit_der zero\n");
return 1;
}
/* Encode short strings with increasing bit lengths */
for (i = 0; i < sizeof (tv) / sizeof (tv[0]); i++)
{
/* Encode */
asn1_bit_der ((const unsigned char *) tv[i].bitstr, tv[i].bitlen,
der, &der_len);
#if 0
{
size_t j;
for (j = 0; j < der_len; j++)
printf ("\\x%02x", der[j]);
printf ("\n");
}
#endif
if (der_len != tv[i].derlen
|| memcmp (der, tv[i].der, der_len) != 0)
{
fprintf (stderr, "asn1_bit_der iter %ld\n", i);
return 1;
}
/* Decode it */
result = asn1_get_bit_der (der, der_len, &ret_len, str,
str_size, &bit_len);
if (result != ASN1_SUCCESS || ret_len != tv[i].derlen
|| bit_len != tv[i].bitlen)
{
fprintf (stderr, "asn1_get_bit_der iter %ld\n", i);
return 1;
}
}
/* Decode sample from "A Layman's Guide to a Subset of ASN.1, BER,
and DER" section 5.4 "BIT STRING": "The BER encoding of the BIT
STRING value "011011100101110111" can be any of the following,
among others, depending on the choice of padding bits, the form
of length octets [...]".
*/
/* 03 04 06 6e 5d c0 DER encoding */
memcpy (der, "\x04\x06\x6e\x5d\xc0", 5);
der_len = 5;
result = asn1_get_bit_der (der, der_len, &ret_len, str, str_size, &bit_len);
if (result != ASN1_SUCCESS || ret_len != 5
|| bit_len != 18 || memcmp (str, "\x6e\x5d\xc0", 3) != 0)
{
fprintf (stderr, "asn1_get_bit_der example\n");
return 1;
}
der_len = sizeof (der);
asn1_bit_der (str, bit_len, der, &der_len);
if (der_len != 5 || memcmp (der, "\x04\x06\x6e\x5d\xc0", 5) != 0)
{
fprintf (stderr, "asn1_bit_der example roundtrip\n");
return 1;
}
/* 03 04 06 6e 5d e0 padded with "100000" */
memcpy (der, "\x04\x06\x6e\x5d\xe0", 5);
der_len = 5;
result = asn1_get_bit_der (der, der_len, &ret_len, str, str_size, &bit_len);
if (result != ASN1_SUCCESS || ret_len != 5
|| bit_len != 18 || memcmp (str, "\x6e\x5d\xe0", 3) != 0)
{
fprintf (stderr, "asn1_get_bit_der example padded\n");
return 1;
}
der_len = sizeof (der);
asn1_bit_der (str, bit_len, der, &der_len);
if (der_len != 5 || memcmp (der, "\x04\x06\x6e\x5d\xc0", 5) != 0)
{
fprintf (stderr, "asn1_bit_der example roundtrip\n");
return 1;
}
/* 03 81 04 06 6e 5d c0 long form of length octets */
memcpy (der, "\x81\x04\x06\x6e\x5d\xc0", 6);
der_len = 6;
result = asn1_get_bit_der (der, der_len, &ret_len, str, str_size, &bit_len);
if (result != ASN1_SUCCESS || ret_len != 6
|| bit_len != 18 || memcmp (str, "\x6e\x5d\xc0", 3) != 0)
{
fprintf (stderr, "asn1_get_bit_der example long form\n");
return 1;
}
der_len = sizeof (der);
asn1_bit_der (str, bit_len, der, &der_len);
if (der_len != 5 || memcmp (der, "\x04\x06\x6e\x5d\xc0", 5) != 0)
{
fprintf (stderr, "asn1_bit_der example roundtrip\n");
return 1;
}
return 0;
}
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