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Encryption and Compression Functions

TiDB supports most of the encryption and compression functions available in MySQL 5.7.

Supported functions

NameDescription
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
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
CREATE_ASYMMETRIC_PRIV_KEY()Create private key
CREATE_ASYMMETRIC_PUB_KEY()Create public key
CREATE_DH_PARAMETERS()Generate shared DH secret
CREATE_DIGEST()Generate digest from string
ASYMMETRIC_DECRYPT()Decrypt ciphertext using private or public key
ASYMMETRIC_DERIVE()Derive symmetric key from asymmetric keys
ASYMMETRIC_ENCRYPT()Encrypt cleartext using private or public key
ASYMMETRIC_SIGN()Generate signature from digest
ASYMMETRIC_VERIFY()Verify that signature matches digest

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