加密和压缩函数
DRDS 支持如下加密和压缩函数：
| 函数名 | 描述 |
|---|---|
| AES_DECRYPT() | Decrypt using AES |
| AES_ENCRYPT() | Encrypt using AES |
| COMPRESS() | Return result as a binary string |
| MD5() | Calculate MD5 checksum |
| UNCOMPRESS() | Uncompress a string compressed |
| UNCOMPRESSED_LENGTH() | Return the length of a string before compression |
不支持函数列表
对比 MySQL5.7，DRDS 有如下加密和压缩函数暂不支持：
| 函数名 | 描述 |
|---|---|
| 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 |
| 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 |
| DECODE() (deprecated 5.7.2) | Decodes a string encrypted using ENCODE() |
| DES_DECRYPT() (deprecated 5.7.6) | Decrypt a string |
| DES_ENCRYPT() (deprecated 5.7.6) | Encrypt a string |
| ENCODE() (deprecated 5.7.2) | Encode a string |
| ENCRYPT() (deprecated 5.7.6) | Encrypt a string |
| OLD_PASSWORD() | Return the value of the pre-4.1 implementation of PASSWORD |
| PASSWORD() (deprecated 5.7.6) | 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 |
| VALIDATE_PASSWORD_STRENGTH() | Determine strength of password |
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