# MD5()

## Function description

`MD5()` function A widely used hash function to generate a 32-character hexadecimal MD5 hash of a string that converts an input message of any length into a 128-bit (16-byte) hash value, usually expressed as a 32-bit hexadecimal string. If the parameter is NULL, NULL is returned.

## Function Syntax

```text
> MD5(str)
```

## Parameter definition

| Parameters | Description |
| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| str | Required parameters. String to convert |

## Example

```text
mysql> select md5("hello world");
+---------------------------------------+
| md5(hello world) |
+---------------------------------------+
| 5eb63bbbe01eeed093cb22bb8f5acdc3 |
+---------------------------------------+
1 row in set (0.00 sec)

mysql> select md5(null);
+---------------+
| md5(null) |
+---------------+
| NULL |
+---------------+
1 row in set (0.00 sec)
```