From 8a59c08583424d59ac30c1261eedff40d653f8b0 Mon Sep 17 00:00:00 2001 From: "Dr. Matthias St. Pierre" Date: Fri, 18 May 2018 00:51:15 +0200 Subject: [PATCH] DH: add some basic tests (and comments) Reviewed-by: Rich Salz (Merged from https://github.com/openssl/openssl/pull/6273) --- test/dhtest.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/test/dhtest.c b/test/dhtest.c index 96d7027cc6..8f0eec03a3 100644 --- a/test/dhtest.c +++ b/test/dhtest.c @@ -26,6 +26,11 @@ static int cb(int p, int n, BN_GENCB *arg); static int dh_test(void) { + DH *dh; + BIGNUM *p, *q, *g; + const BIGNUM *p2, *q2, *g2; + BIGNUM *priv_key; + const BIGNUM *pub_key2, *priv_key2; BN_GENCB *_cb = NULL; DH *a = NULL; DH *b = NULL; @@ -39,6 +44,78 @@ static int dh_test(void) int i, alen, blen, clen, aout, bout, cout; int ret = 0; + if (!TEST_ptr(dh = DH_new()) + || !TEST_ptr(p = BN_new()) + || !TEST_ptr(q = BN_new()) + || !TEST_ptr(g = BN_new()) + || !TEST_ptr(priv_key = BN_new())) + goto err; + + /* + * I) basic tests + */ + + /* using a small predefined Sophie Germain DH group with generator 3 */ + if (!TEST_true(BN_set_word(p, 4079L)) + || !TEST_true(BN_set_word(q, 2039L)) + || !TEST_true(BN_set_word(g, 3L)) + || !TEST_true(DH_set0_pqg(dh, p, q, g))) + goto err; + + /* test the combined getter for p, q, and g */ + DH_get0_pqg(dh, &p2, &q2, &g2); + if (!TEST_ptr_eq(p2, p) + || !TEST_ptr_eq(q2, q) + || !TEST_ptr_eq(g2, g)) + goto err; + + /* test the simple getters for p, q, and g */ + if (!TEST_ptr_eq(DH_get0_p(dh), p2) + || !TEST_ptr_eq(DH_get0_q(dh), q2) + || !TEST_ptr_eq(DH_get0_g(dh), g2)) + goto err; + + /* set the private key only*/ + if (!TEST_true(BN_set_word(priv_key, 1234L)) + || !TEST_true(DH_set0_key(dh, NULL, priv_key))) + goto err; + + /* test the combined getter for pub_key and priv_key */ + DH_get0_key(dh, &pub_key2, &priv_key2); + if (!TEST_ptr_eq(pub_key2, NULL) + || !TEST_ptr_eq(priv_key2, priv_key)) + goto err; + + /* test the simple getters for pub_key and priv_key */ + if (!TEST_ptr_eq(DH_get0_pub_key(dh), pub_key2) + || !TEST_ptr_eq(DH_get0_priv_key(dh), priv_key2)) + goto err; + + /* now generate a key pair ... */ + if (!DH_generate_key(dh)) + goto err; + + /* ... and check whether the private key was reused: */ + + /* test it with the combined getter for pub_key and priv_key */ + DH_get0_key(dh, &pub_key2, &priv_key2); + if (!TEST_ptr(pub_key2) + || !TEST_ptr_eq(priv_key2, priv_key)) + goto err; + + /* test it the simple getters for pub_key and priv_key */ + if (!TEST_ptr_eq(DH_get0_pub_key(dh), pub_key2) + || !TEST_ptr_eq(DH_get0_priv_key(dh), priv_key2)) + goto err; + + /* check whether the public key was calculated correclty */ + TEST_uint_eq(BN_get_word(pub_key2), 3331L); + + /* + * II) key generation + */ + + /* generate a DH group ... */ if (!TEST_ptr(_cb = BN_GENCB_new())) goto err; BN_GENCB_set(_cb, &cb, NULL); @@ -47,6 +124,7 @@ static int dh_test(void) DH_GENERATOR_5, _cb))) goto err; + /* ... and check whether it is valid */ if (!DH_check(a, &i)) goto err; if (!TEST_false(i & DH_CHECK_P_NOT_PRIME) @@ -57,6 +135,7 @@ static int dh_test(void) DH_get0_pqg(a, &ap, NULL, &ag); + /* now create another copy of the DH group for the peer */ if (!TEST_ptr(b = DH_new())) goto err; @@ -66,6 +145,10 @@ static int dh_test(void) goto err; bp = bg = NULL; + /* + * III) simulate a key exchange + */ + if (!DH_generate_key(a)) goto err; DH_get0_key(a, &apub_key, NULL); @@ -114,6 +197,8 @@ static int dh_test(void) BN_free(bg); BN_free(cpriv_key); BN_GENCB_free(_cb); + DH_free(dh); + return ret; } -- 2.25.1