HSM: openssl_pkey_get_private(URI) support

Add the RFC7512 URI when reading the private keys.

Author: vjardin

ext/openssl/openssl.c

@@ -3621,6 +3621,12 @@ static EVP_PKEY *php_openssl_pkey_from_zval(zval *val, int public_key, char *pas
 			}
 		} else {
 			/* we want the private key */
+			if (engine) {
+				key = ENGINE_load_private_key(engine, Z_STRVAL_P(val), NULL, NULL);
+				ENGINE_free(engine);
+				ENGINE_finish(engine);
+				engine = NULL;
+			} else {
 			BIO *in;
 
 			if (filename) {
@@ -3641,6 +3647,7 @@ static EVP_PKEY *php_openssl_pkey_from_zval(zval *val, int public_key, char *pas
 				key = PEM_read_bio_PrivateKey(in, NULL, php_openssl_pem_password_cb, &password);
 			}
 			BIO_free(in);
+			} // TODO indent, just to please/ease the first round of code review
 		}
 	}