Encryption and Compression Functions
TiDB supports most of the encryption and compression functions available in MySQL 5.7.
Supported functions
| Name | Description |
|---|---|
MD5() | Calculate MD5 checksum |
PASSWORD() | Calculate and return a password string |
RANDOM_BYTES() | Return a random byte vector |
SHA1(), SHA() | Calculate an SHA-1 160-bit checksum |
SHA2() | Calculate an SHA-2 checksum |
SM3() | Calculate an SM3 checksum (currently MySQL does not support this function) |
AES_DECRYPT() | Decrypt using AES |
AES_ENCRYPT() | Encrypt using AES |
COMPRESS() | Return result as a binary string |
UNCOMPRESS() | Uncompress a string compressed |
UNCOMPRESSED_LENGTH() | Return the length of a string before compression |
Related system variables
The block_encryption_mode variable sets the encryption mode that is used for AES_ENCRYPT() and AES_DECRYPT().
Unsupported functions
DES_DECRYPT(),DES_ENCRYPT(),OLD_PASSWORD(),ENCRYPT(): these functions were deprecated in MySQL 5.7 and removed in 8.0.VALIDATE_PASSWORD_STRENGTH().- Functions only available in MySQL Enterprise Issue #2632.