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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <string.h>
#include <openssl/bn.h>
#include "crypto/asn1_dsa.h"
#include "testutil.h"
static unsigned char t_dsa_sig[] = {
0x30, 0x06, /* SEQUENCE tag + length */
0x02, 0x01, 0x01, /* INTEGER tag + length + content */
0x02, 0x01, 0x02 /* INTEGER tag + length + content */
};
static unsigned char t_dsa_sig_extra[] = {
0x30, 0x06, /* SEQUENCE tag + length */
0x02, 0x01, 0x01, /* INTEGER tag + length + content */
0x02, 0x01, 0x02, /* INTEGER tag + length + content */
0x05, 0x00 /* NULL tag + length */
};
static unsigned char t_dsa_sig_msb[] = {
0x30, 0x08, /* SEQUENCE tag + length */
0x02, 0x02, 0x00, 0x81, /* INTEGER tag + length + content */
0x02, 0x02, 0x00, 0x82 /* INTEGER tag + length + content */
};
static unsigned char t_dsa_sig_two[] = {
0x30, 0x08, /* SEQUENCE tag + length */
0x02, 0x02, 0x01, 0x00, /* INTEGER tag + length + content */
0x02, 0x02, 0x02, 0x00 /* INTEGER tag + length + content */
};
/*
* Badly coded ASN.1 INTEGER zero wrapped in a sequence along with another
* (valid) INTEGER.
*/
static unsigned char t_invalid_int_zero[] = {
0x30, 0x05, /* SEQUENCE tag + length */
0x02, 0x00, /* INTEGER tag + length */
0x02, 0x01, 0x2a /* INTEGER tag + length */
};
/*
* Badly coded ASN.1 INTEGER (with leading zeros) wrapped in a sequence along
* with another (valid) INTEGER.
*/
static unsigned char t_invalid_int[] = {
0x30, 0x07, /* SEQUENCE tag + length */
0x02, 0x02, 0x00, 0x7f, /* INTEGER tag + length */
0x02, 0x01, 0x2a /* INTEGER tag + length */
};
/*
* Negative ASN.1 INTEGER wrapped in a sequence along with another
* (valid) INTEGER.
*/
static unsigned char t_neg_int[] = {
0x30, 0x06, /* SEQUENCE tag + length */
0x02, 0x01, 0xaa, /* INTEGER tag + length */
0x02, 0x01, 0x2a /* INTEGER tag + length */
};
static unsigned char t_trunc_der[] = {
0x30, 0x08, /* SEQUENCE tag + length */
0x02, 0x02, 0x00, 0x81, /* INTEGER tag + length */
0x02, 0x02, 0x00 /* INTEGER tag + length */
};
static unsigned char t_trunc_seq[] = {
0x30, 0x07, /* SEQUENCE tag + length */
0x02, 0x02, 0x00, 0x81, /* INTEGER tag + length */
0x02, 0x02, 0x00, 0x82 /* INTEGER tag + length */
};
static int test_decode(void)
{
int rv = 0;
BIGNUM *r;
BIGNUM *s;
const unsigned char *pder;
r = BN_new();
s = BN_new();
/* Positive tests */
pder = t_dsa_sig;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_dsa_sig)) == 0
|| !TEST_ptr_eq(pder, (t_dsa_sig + sizeof(t_dsa_sig)))
|| !TEST_BN_eq_word(r, 1) || !TEST_BN_eq_word(s, 2)) {
TEST_info("asn1_dsa test_decode: t_dsa_sig failed");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_dsa_sig_extra;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_dsa_sig_extra)) == 0
|| !TEST_ptr_eq(pder,
(t_dsa_sig_extra + sizeof(t_dsa_sig_extra) - 2))
|| !TEST_BN_eq_word(r, 1) || !TEST_BN_eq_word(s, 2)) {
TEST_info("asn1_dsa test_decode: t_dsa_sig_extra failed");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_dsa_sig_msb;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_dsa_sig_msb)) == 0
|| !TEST_ptr_eq(pder, (t_dsa_sig_msb + sizeof(t_dsa_sig_msb)))
|| !TEST_BN_eq_word(r, 0x81) || !TEST_BN_eq_word(s, 0x82)) {
TEST_info("asn1_dsa test_decode: t_dsa_sig_msb failed");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_dsa_sig_two;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_dsa_sig_two)) == 0
|| !TEST_ptr_eq(pder, (t_dsa_sig_two + sizeof(t_dsa_sig_two)))
|| !TEST_BN_eq_word(r, 0x100) || !TEST_BN_eq_word(s, 0x200)) {
TEST_info("asn1_dsa test_decode: t_dsa_sig_two failed");
goto fail;
}
/* Negative tests */
pder = t_invalid_int_zero;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_invalid_int_zero)) != 0) {
TEST_info("asn1_dsa test_decode: Expected t_invalid_int_zero to fail");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_invalid_int;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_invalid_int)) != 0) {
TEST_info("asn1_dsa test_decode: Expected t_invalid_int to fail");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_neg_int;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_neg_int)) != 0) {
TEST_info("asn1_dsa test_decode: Expected t_neg_int to fail");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_trunc_der;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_trunc_der)) != 0) {
TEST_info("asn1_dsa test_decode: Expected fail t_trunc_der");
goto fail;
}
BN_clear(r);
BN_clear(s);
pder = t_trunc_seq;
if (ossl_decode_der_dsa_sig(r, s, &pder, sizeof(t_trunc_seq)) != 0) {
TEST_info("asn1_dsa test_decode: Expected fail t_trunc_seq");
goto fail;
}
rv = 1;
fail:
BN_free(r);
BN_free(s);
return rv;
}
int setup_tests(void)
{
ADD_TEST(test_decode);
return 1;
}
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