Compatibility with libargon2 versions 20161029 and 20160821

libargon2 20161029 introduces the `type` parameter to the argon2_encodedlen
function that is not present in 20160821. This change ensures the Argon2
functionality introduced in RFC `argon2_password_hash` is compatible with
both versions, as the library version that package maintainers package may
differ.

Author: charlesportwoodii

ext/standard/config.m4

@@ -439,6 +439,13 @@ if test "$PHP_PASSWORD_ARGON2" != "no"; then
   ], [
     AC_MSG_ERROR([Problem with libargon2.(a|so). Please verify that Argon2 header and libaries are installed])
   ])
+
+  AC_CHECK_LIB(argon2, argon2id_hash_raw, [
+    LIBS="$LIBS -largon2"
+    AC_DEFINE(HAVE_ARGON2ID, 1, [ Define to 1 if Argon2 library has support for Argon2ID])
+  ], [
+    AC_MSG_RESULT([not found])
+  ])
 fi
 
 dnl

ext/standard/config.w32

@@ -7,6 +7,9 @@ if (PHP_PASSWORD_ARGON2 != "no") {
 	if (CHECK_LIB("argon2_a.lib;argon2.lib", null, PHP_PASSWORD_ARGON2)
 	&& CHECK_HEADER_ADD_INCLUDE("argon2.h", "CFLAGS")) {
 		AC_DEFINE('HAVE_ARGON2LIB', 1);
+		if (CHECK_FUNC_IN_HEADER("argon2.h", "argon2id_hash_raw", PHP_PHP_BUILD + "\\include", "CFLAGS")) {
+			AC_DEFINE('HAVE_ARGON2ID', 1);
+		}
 	} else {
 		WARNING("Argon2 not enabled; libaries and headers not found");
 	}

ext/standard/password.c

@@ -545,6 +545,9 @@ PHP_FUNCTION(password_hash)
 					threads,
 					(uint32_t)salt_len,
 					out_len
+#if HAVE_ARGON2ID
+					, type
+#endif
 				);
 
 				out = emalloc(out_len + 1);