SM4_DECRYPT
Description
Syntax
VARCHAR SM4_DECRYPT(VARCHAR str, VARCHAR key_str[, VARCHAR init_vector][, VARCHAR encryption_mode])
Returns the decrypted result, where:
str
is the text to be decrypted;key_str
is the key. Note that this key is not a hexadecimal encoding, but a string representation of the encoded key. For example, for 128-bit key encryption,key_str
should be 16-length. If the key is not long enough, use zero padding to make it up. If it is longer than that, the final key is found using a cyclic xor method. For example, if the 128-bit key used by the algorithm finally iskey
, thenkey[i] = key_str[i] ^ key_str[i+128] ^ key_str[i+256] ^ ...
init_vector
is the initial vector to be used in the algorithm, this is only valid for some algorithms, if not specified then Doris will use the built-in value;encryption_mode
is the encryption algorithm, optionally available in variables。
danger
Function with two arguments will ignore session variable block_encryption_mode
and always use AES_128_ECB
by mistake to do encryption. So it's strongly not recommended to use it.
Example
MySQL [(none)]> select SM4_DECRYPT(FROM_BASE64('aDjwRflBrDjhBZIOFNw3Tg=='),'F3229A0B371ED2D9441B830D21A390C3');
+------------------------------------------------------+
| sm4_decrypt(from_base64('aDjwRflBrDjhBZIOFNw3Tg==')) |
+------------------------------------------------------+
| text |
+------------------------------------------------------+
1 row in set (0.009 sec)
MySQL> set block_encryption_mode="SM4_128_CBC";
Query OK, 0 rows affected (0.006 sec)
MySQL > select SM4_DECRYPT(FROM_BASE64('G7yqOKfEyxdagboz6Qf01A=='),'F3229A0B371ED2D9441B830D21A390C3', '0123456789');
+--------------------------------------------------------------------------------------------------------+
| sm4_decrypt(from_base64('G7yqOKfEyxdagboz6Qf01A=='), 'F3229A0B371ED2D9441B830D21A390C3', '0123456789') |
+--------------------------------------------------------------------------------------------------------+
| text |
+--------------------------------------------------------------------------------------------------------+
1 row in set (0.012 sec)
Keywords
SM4_DECRYPT, SM4, DECRYPT