The functions in this section perform encryption and decryption, and
compression and uncompression:
| encryption | decryption |
| AES_ENCRYT() | AES_DECRYPT() |
| ENCODE() | DECODE() |
| DES_ENCRYPT() | DES_DECRYPT() |
| ENCRYPT() | Not available |
| MD5() | Not available |
| OLD_PASSWORD() | Not available |
| PASSWORD() | Not available |
| SHA() or SHA1() | Not available |
| Not available | UNCOMPRESSED_LENGTH() |