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wolfssl/tests/api/test_dh.c
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Lealem Amedie 277bd66624 FIPS: Default to 2048 bit min DH crypto
2026-07-01 08:26:23 -06:00

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/* test_dh.c
*
* Copyright (C) 2006-2026 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL 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.
*
* wolfSSL 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#include <tests/unit.h>
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#define WOLFSSL_MISC_INCLUDED
#include <wolfcrypt/src/misc.c>
#endif
#include <wolfssl/wolfcrypt/dh.h>
#include <wolfssl/wolfcrypt/types.h>
#include <tests/api/api.h>
#include <tests/api/test_dh.h>
/*
* Testing wc_DhPublicKeyDecode
*/
int test_wc_DhPublicKeyDecode(void)
{
EXPECT_DECLS;
#ifndef NO_DH
#if defined(WOLFSSL_DH_EXTRA) && defined(USE_CERT_BUFFERS_2048)
DhKey key;
word32 inOutIdx;
XMEMSET(&key, 0, sizeof(DhKey));
ExpectIntEQ(wc_InitDhKey(&key), 0);
ExpectIntEQ(wc_DhPublicKeyDecode(NULL,NULL,NULL,0), WC_NO_ERR_TRACE(BAD_FUNC_ARG));
ExpectIntEQ(wc_DhPublicKeyDecode(dh_pub_key_der_2048,NULL,NULL,0),
WC_NO_ERR_TRACE(BAD_FUNC_ARG));
ExpectIntEQ(wc_DhPublicKeyDecode(dh_pub_key_der_2048,NULL,NULL,0),
WC_NO_ERR_TRACE(BAD_FUNC_ARG));
inOutIdx = 0;
ExpectIntEQ(wc_DhPublicKeyDecode(dh_pub_key_der_2048,&inOutIdx,NULL, 0),
WC_NO_ERR_TRACE(BAD_FUNC_ARG));
inOutIdx = 0;
ExpectIntEQ(wc_DhPublicKeyDecode(dh_pub_key_der_2048,&inOutIdx,&key, 0),
WC_NO_ERR_TRACE(BAD_FUNC_ARG));
inOutIdx = 0;
ExpectIntEQ(wc_DhPublicKeyDecode(dh_pub_key_der_2048,&inOutIdx,&key,
sizeof_dh_pub_key_der_2048), 0);
ExpectIntNE(key.p.used, 0);
ExpectIntNE(key.g.used, 0);
ExpectIntEQ(key.q.used, 0);
ExpectIntNE(key.pub.used, 0);
ExpectIntEQ(key.priv.used, 0);
DoExpectIntEQ(wc_FreeDhKey(&key), 0);
#endif
#endif /* !NO_DH */
return EXPECT_RESULT();
}
/*
* Tests that wc_DhAgree rejects peer public keys that are not in the expected
* subgroup when the group order q is known (SP 800-56Ar3 section 5.6.2.3.1).
* This test not compatible with WOLFSSL_SP_MATH, because p vector is not 2048,
* 3072, or 4096 bits.
*/
int test_wc_DhAgree_subgroup_check(void)
{
EXPECT_DECLS;
#if !defined(NO_DH) && !defined(WOLFSSL_SP_MATH) && !defined(HAVE_SELFTEST) && \
(!defined(HAVE_FIPS) || FIPS_VERSION3_GT(7,0,0)) && DH_MIN_SIZE <= 512
DhKey key;
WC_RNG rng;
byte agree[64];
/* DSA-style 512-bit group where p - 1 == k * q, where q is
* a 161-bit prime, and g generates the order-q subgroup.
*
* y_bad has order 3 mod p (y^3 mod p == 1). It passes the bounds check
* (2 <= y <= p-2), but is not in the order-q subgroup (y^q mod p != 1).
* */
const byte dsa_dh_p[] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xab, 0x80, 0x00, 0x00, 0x47
};
const byte dsa_dh_q[] = {
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x07
};
const byte dsa_dh_g[] = {
0x63, 0x23, 0x85, 0x16, 0x66, 0xc1, 0xf1, 0xf0,
0xc3, 0xa0, 0x95, 0xd0, 0x4b, 0x68, 0x92, 0xf3,
0x64, 0x09, 0xbd, 0x89, 0x57, 0x85, 0xfa, 0x44,
0x86, 0xc1, 0x64, 0x86, 0x1e, 0xa1, 0x91, 0x33,
0xd8, 0xaf, 0xb5, 0xa6, 0x28, 0xed, 0xc2, 0x7c,
0x37, 0xa1, 0x5b, 0x0b, 0xf7, 0x6a, 0xa4, 0x61,
0x75, 0x08, 0x16, 0x12, 0xe5, 0x62, 0xc4, 0x89,
0x5a, 0x9c, 0x1b, 0x76, 0xe1, 0x5f, 0x63, 0x21
};
/* Order-3 element: y^3 = 1 mod p, y^q mod p != 1 */
const byte dsa_dh_y_bad[] = {
0x41, 0x61, 0x8f, 0xcd, 0xb7, 0x76, 0xb7, 0xd2,
0x38, 0x46, 0x98, 0x16, 0xa3, 0xfd, 0xd2, 0xa2,
0x71, 0x6a, 0x0b, 0x66, 0x87, 0x3f, 0x6c, 0x15,
0x28, 0x46, 0x79, 0xfb, 0x64, 0x4c, 0x2a, 0x28,
0xe6, 0x65, 0x44, 0x8e, 0xf8, 0x30, 0x4e, 0x73,
0xec, 0x8b, 0x4b, 0xd2, 0x82, 0xd1, 0x87, 0x20,
0x35, 0x47, 0x42, 0xe6, 0x94, 0x49, 0x7c, 0x73,
0xbc, 0x47, 0xcd, 0xcb, 0x88, 0xb8, 0xed, 0x62
};
/* A {priv, pub} keypair generated from these parameters.
* This pair would pass a partial subgroup test. The pub key
* is not actually needed for this test. */
const byte priv[] = {
0xc7, 0x82, 0xd1, 0xc4, 0x13, 0xa8, 0x3f, 0xe0,
0xef, 0xdc, 0xf4, 0x10, 0xf9, 0xf4, 0xc7, 0x0e,
0x30, 0xbc, 0x65, 0x14
};
/*
byte pub[] = {
0x28, 0x2e, 0x2b, 0xf4, 0x4d, 0x83, 0xf5, 0xd8,
0x77, 0x5a, 0xea, 0x7c, 0x4d, 0x89, 0x98, 0x1b,
0xe9, 0x61, 0x69, 0x35, 0x39, 0xdd, 0x1b, 0x2d,
0x5f, 0x35, 0x29, 0x25, 0xd9, 0xec, 0xcc, 0x46,
0x39, 0xfe, 0x3e, 0xe4, 0x67, 0xc9, 0x47, 0xe1,
0xc4, 0x5b, 0x02, 0x95, 0x61, 0x4a, 0x23, 0xdc,
0x3a, 0xf6, 0xce, 0x18, 0x99, 0x1e, 0xe0, 0x72,
0xeb, 0x53, 0x1f, 0xf0, 0xc9, 0x50, 0x9a, 0xc7
};
*/
word32 privSz = sizeof(priv);
word32 agreeSz;
#if defined(WOLFSSL_PUBLIC_MP) && !defined(WOLFSSL_SMALL_STACK)
/* optional sanity checks for the mp used in this dh test. */
const byte expt[1] = {0x03};
mp_int p[1], e[1], q[1];
mp_int g[1], y[1], r[1];
int isPrime = 0;
/* init mp */
ExpectIntEQ(mp_init_multi(p, q, g, y, r, e), MP_OKAY);
/* load mp values */
ExpectIntEQ(mp_read_unsigned_bin(p, dsa_dh_p, sizeof(dsa_dh_p)), MP_OKAY);
ExpectIntEQ(mp_read_unsigned_bin(e, expt, sizeof(expt)), MP_OKAY);
ExpectIntEQ(mp_read_unsigned_bin(q, dsa_dh_q, sizeof(dsa_dh_q)), MP_OKAY);
ExpectIntEQ(mp_read_unsigned_bin(g, dsa_dh_g, sizeof(dsa_dh_g)), MP_OKAY);
ExpectIntEQ(mp_read_unsigned_bin(y, dsa_dh_y_bad, sizeof(dsa_dh_y_bad)),
MP_OKAY);
/* p, q are prime */
ExpectIntEQ(mp_prime_is_prime(p, 8, &isPrime), MP_OKAY);
ExpectIntEQ(isPrime, 1);
ExpectIntEQ(mp_prime_is_prime(q, 8, &isPrime), MP_OKAY);
ExpectIntEQ(isPrime, 1);
/* (y ^ 3) mod p == 1*/
ExpectIntEQ(mp_exptmod(y, e, p, r), MP_OKAY);
ExpectIntEQ(mp_cmp_d(r, 1), MP_EQ);
/* (g ^ q) mod p == 1*/
ExpectIntEQ(mp_exptmod(g, q, p, r), MP_OKAY);
ExpectIntEQ(mp_cmp_d(r, 1), MP_EQ);
/* (y ^ q) mod p != 1*/
ExpectIntEQ(mp_exptmod(y, q, p, r), MP_OKAY);
ExpectIntNE(mp_cmp_d(r, 1), MP_EQ);
/* clear them */
mp_clear(p); mp_clear(e); mp_clear(q);
mp_clear(g); mp_clear(y); mp_clear(r);
#endif /* WOLFSSL_PUBLIC_MP && !WOLFSSL_SMALL_STACK */
XMEMSET(&key, 0, sizeof(DhKey));
XMEMSET(&rng, 0, sizeof(WC_RNG));
ExpectIntEQ(wc_InitRng(&rng), 0);
ExpectIntEQ(wc_InitDhKey(&key), 0);
/* Set DH parameters. */
ExpectIntEQ(wc_DhSetCheckKey(&key, dsa_dh_p, sizeof(dsa_dh_p),
dsa_dh_g, sizeof(dsa_dh_g), dsa_dh_q, sizeof(dsa_dh_q),
0, &rng), 0);
/* sanity: agree with g (valid subgroup element). This should succeed */
agreeSz = sizeof(agree);
ExpectIntEQ(wc_DhAgree(&key, agree, &agreeSz, priv, privSz,
dsa_dh_g, sizeof(dsa_dh_g)), 0);
/* y_bad is not in the order-q subgroup. This should be rejected with
* error DH_CHECK_PUB_E.*/
agreeSz = sizeof(agree);
ExpectIntEQ(wc_DhAgree(&key, agree, &agreeSz, priv, privSz,
dsa_dh_y_bad, sizeof(dsa_dh_y_bad)),
DH_CHECK_PUB_E);
wc_FreeDhKey(&key);
wc_FreeRng(&rng);
#endif /* !NO_DH && !defined(WOLFSSL_SP_MATH) && !HAVE_SELFTEST && etc... */
return EXPECT_RESULT();
}
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