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wolfssl: Store RNG on object for curve25519

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5.8.2 enables blinding for curve25519 by default, so the RNG set when
making the key is also used later on.
This commit is contained in:
Tobias Brunner
2025-07-19 12:10:25 +02:00
parent 1b62e88980
commit 011c346b00
1 changed files with 12 additions and 7 deletions
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src/libstrongswan/plugins/wolfssl/wolfssl_x_diffie_hellman.c
+12 -7
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@@ -84,6 +84,11 @@ struct private_diffie_hellman_t {
* Shared secret
*/
chunk_t shared_secret;
/**
* RNG used for key generation and blinding with curve25519
*/
WC_RNG rng;
};
#ifdef HAVE_CURVE25519
@@ -289,6 +294,7 @@ METHOD(key_exchange_t, destroy, void,
#endif
}
chunk_clear(&this->shared_secret);
wc_FreeRng(&this->rng);
free(this);
}
@@ -298,7 +304,6 @@ METHOD(key_exchange_t, destroy, void,
key_exchange_t *wolfssl_x_diffie_hellman_create(key_exchange_method_t group)
{
private_diffie_hellman_t *this;
WC_RNG rng;
int ret = -1;
INIT(this,
@@ -309,7 +314,7 @@ key_exchange_t *wolfssl_x_diffie_hellman_create(key_exchange_method_t group)
.group = group,
);
if (wc_InitRng(&rng) != 0)
if (wc_InitRng(&this->rng) != 0)
{
DBG1(DBG_LIB, "initializing a random number generator failed");
destroy(this);
@@ -325,7 +330,6 @@ key_exchange_t *wolfssl_x_diffie_hellman_create(key_exchange_method_t group)
#ifdef TESTABLE_KE
this->public.set_seed = _set_seed_25519;
#endif
if (wc_curve25519_init(&this->key.key25519) != 0 ||
wc_curve25519_init(&this->pub.key25519) != 0)
{
@@ -333,7 +337,7 @@ key_exchange_t *wolfssl_x_diffie_hellman_create(key_exchange_method_t group)
destroy(this);
return NULL;
}
ret = wc_curve25519_make_key(&rng, CURVE25519_KEYSIZE,
ret = wc_curve25519_make_key(&this->rng, CURVE25519_KEYSIZE,
&this->key.key25519);
#endif
}
@@ -354,13 +358,14 @@ key_exchange_t *wolfssl_x_diffie_hellman_create(key_exchange_method_t group)
destroy(this);
return NULL;
}
ret = wc_curve448_make_key(&rng, CURVE448_KEY_SIZE, &this->key.key448);
ret = wc_curve448_make_key(&this->rng, CURVE448_KEY_SIZE,
&this->key.key448);
#endif
}
wc_FreeRng(&rng);
if (ret != 0)
{
DBG1(DBG_LIB, "making a key failed");
DBG1(DBG_LIB, "making %N key failed", key_exchange_method_names,
this->group);
destroy(this);
return NULL;
}