Use unsigned char in _crypt_extended_r

Avoid signed shift UB.

Author: nikic

ext/standard/crypt.c

@@ -179,7 +179,7 @@ PHPAPI zend_string *php_crypt(const char *password, const int pass_len, const ch
 			memset(&buffer, 0, sizeof(buffer));
 			_crypt_extended_init_r();
 
-			crypt_res = _crypt_extended_r(password, salt, &buffer);
+			crypt_res = _crypt_extended_r((const unsigned char *) password, salt, &buffer);
 			if (!crypt_res || (salt[0] == '*' && salt[1] == '0')) {
 				return NULL;
 			} else {

ext/standard/crypt_freesec.c

@@ -607,7 +607,7 @@ des_cipher(const char *in, char *out, uint32_t salt, int count,
 }
 
 char *
-_crypt_extended_r(const char *key, const char *setting,
+_crypt_extended_r(const unsigned char *key, const char *setting,
 	struct php_crypt_extended_data *data)
 {
 	int		i;

ext/standard/crypt_freesec.h

@@ -28,7 +28,7 @@ struct php_crypt_extended_data {
 
 void _crypt_extended_init(void);
 
-char *_crypt_extended_r(const char *key, const char *setting,
+char *_crypt_extended_r(const unsigned char *key, const char *setting,
 	struct php_crypt_extended_data *data);
 
 #endif