fix dsa selection

Author: qmuntal

dsa.go

@@ -260,23 +260,22 @@ func newDSA3(params DSAParameters, X, Y BigInt) (C.GO_EVP_PKEY_PTR, error) {
 		C.go_openssl_OSSL_PARAM_BLD_push_BN(bld, paramG, g) != 1 {
 		return nil, newOpenSSLError("OSSL_PARAM_BLD_push_BN")
 	}
-	selection := C.int(C.GO_EVP_PKEY_KEYPAIR)
+	selection := C.int(C.GO_EVP_PKEY_KEY_PARAMETERS)
 	if Y != nil {
 		pub := bigToBN(Y)
 		defer C.go_openssl_BN_free(pub)
 		if C.go_openssl_OSSL_PARAM_BLD_push_BN(bld, paramPubKey, pub) != 1 {
 			return nil, newOpenSSLError("OSSL_PARAM_BLD_push_BN")
 		}
-		if X == nil {
-			selection = C.int(C.GO_EVP_PKEY_PUBLIC_KEY)
-		}
+		selection = C.int(C.GO_EVP_PKEY_PUBLIC_KEY)
 	}
 	if X != nil {
 		priv := bigToBN(X)
 		defer C.go_openssl_BN_clear_free(priv)
 		if C.go_openssl_OSSL_PARAM_BLD_push_BN(bld, paramPrivKey, priv) != 1 {
 			return nil, newOpenSSLError("OSSL_PARAM_BLD_push_BN")
 		}
+		selection = C.int(C.GO_EVP_PKEY_KEYPAIR)
 	}
 	bldparams := C.go_openssl_OSSL_PARAM_BLD_to_param(bld)
 	if bldparams == nil {
@@ -297,7 +296,6 @@ func newDSA3(params DSAParameters, X, Y BigInt) (C.GO_EVP_PKEY_PTR, error) {
 	if ctx == nil {
 		return nil, newOpenSSLError("EVP_PKEY_CTX_new_from_pkey")
 	}
-	defer C.go_openssl_EVP_PKEY_CTX_free(ctx)
 	if C.go_openssl_EVP_PKEY_keygen_init(ctx) != 1 {
 		return nil, newOpenSSLError("EVP_PKEY_keygen_init")
 	}