botan: Replace deprecated FFI function calls

Several "wrapper" functions have been marked deprecated with 2.11.0.

src/libstrongswan/plugins/botan/botan_ec_diffie_hellman.c

@@ -211,7 +211,7 @@ botan_ec_diffie_hellman_t *botan_ec_diffie_hellman_create(
 		return NULL;
 	}
 
-	if (botan_privkey_create_ecdh(&this->key, rng, this->curve_name))
+	if (botan_privkey_create(&this->key, "ECDH", this->curve_name, rng))
 	{
 		DBG1(DBG_LIB, "ECDH private key generation failed");
 		botan_rng_destroy(rng);

src/libstrongswan/plugins/botan/botan_ec_private_key.c

@@ -336,7 +336,7 @@ botan_ec_private_key_t *botan_ec_private_key_gen(key_type_t type, va_list args)
 
 	this = create_empty(oid);
 
-	if (botan_privkey_create_ecdsa(&this->key, rng, curve))
+	if (botan_privkey_create(&this->key, "ECDSA", curve, rng))
 	{
 		DBG1(DBG_LIB, "EC private key generation failed");
 		botan_rng_destroy(rng);

src/libstrongswan/plugins/botan/botan_rsa_private_key.c

@@ -225,7 +225,7 @@ METHOD(private_key_t, get_keysize, int,
 		return 0;
 	}
 
-	if (botan_privkey_rsa_get_n(n, this->key) ||
+	if (botan_privkey_get_field(n, this->key, "n") ||
 		botan_mp_num_bits(n, &bits))
 	{
 		botan_mp_destroy(n);
@@ -346,6 +346,7 @@ botan_rsa_private_key_t *botan_rsa_private_key_gen(key_type_t type,
 {
 	private_botan_rsa_private_key_t *this;
 	botan_rng_t rng;
+	char buf[BUF_LEN];
 	u_int key_size = 0;
 
 	while (TRUE)
@@ -375,7 +376,9 @@ botan_rsa_private_key_t *botan_rsa_private_key_gen(key_type_t type,
 
 	this = create_empty();
 
-	if (botan_privkey_create_rsa(&this->key, rng, key_size))
+	snprintf(buf, sizeof(buf), "%u", key_size);
+
+	if (botan_privkey_create(&this->key, "RSA", buf, rng))
 	{
 		botan_rng_destroy(rng);
 		free(this);
@@ -412,7 +415,7 @@ static bool calculate_pq(botan_mp_t *n, botan_mp_t *e, botan_mp_t *d,
 	}
 
 	/* k must be even */
-	if (!botan_mp_is_even(k))
+	if (botan_mp_get_bit(k, 0) != 0)
 	{
 		goto error;
 	}
@@ -424,7 +427,7 @@ static bool calculate_pq(botan_mp_t *n, botan_mp_t *e, botan_mp_t *d,
 		goto error;
 	}
 
-	for (t = 0; !botan_mp_is_odd(r); t++)
+	for (t = 0; botan_mp_get_bit(r, 0) != 1; t++)
 	{
 		if (botan_mp_rshift(r, r, 1))
 		{

src/libstrongswan/plugins/botan/botan_rsa_public_key.c

@@ -215,7 +215,7 @@ METHOD(public_key_t, get_keysize, int,
 		return 0;
 	}
 
-	if (botan_pubkey_rsa_get_n(n, this->key) ||
+	if (botan_pubkey_get_field(n, this->key, "n") ||
 		botan_mp_num_bits(n, &bits))
 	{
 		botan_mp_destroy(n);

src/libstrongswan/plugins/botan/botan_x25519.c

@@ -161,7 +161,7 @@ diffie_hellman_t *botan_x25519_create(diffie_hellman_group_t group)
 		return NULL;
 	}
 
-	if (botan_privkey_create_ecdh(&this->key, rng, "curve25519"))
+	if (botan_privkey_create(&this->key, "Curve25519", "", rng))
 	{
 		DBG1(DBG_LIB, "x25519 private key generation failed");
 		botan_rng_destroy(rng);