SM4_DECRYPT

Description

Syntax

VARCHAR SM4_DECRYPT(VARCHAR str, VARCHAR key_str[, VARCHAR init_vector][, VARCHAR encryption_mode])

返回解密后的结果，其中：

• str 为待解密文本；
• key_str 为密钥。注意此密钥并非 16 进制编码，而是编码后的字符串表示。例如对于 128 位密钥加密，key_str 长度应为 16。如果密钥长度不足，使用零填充补齐。如果长度超出，使用循环异或的方式求出最终密钥。例如算法使用的 128 位密钥为 key，则 key[i] = key_str[i] ^ key_str[i+128] ^ key_str[i+256] ^ ...
• init_vector 为算法中使用到的初始向量，仅在特定算法下生效，如不指定，则 Doris 使用内置向量；
• encryption_mode 为加密算法，可选值见于：变量。

Example

mysql> set block_encryption_mode='';
Query OK, 0 rows affected (0.11 sec)

mysql> select SM4_DECRYPT(FROM_BASE64('aDjwRflBrDjhBZIOFNw3Tg=='),'F3229A0B371ED2D9441B830D21A390C3');
+--------------------------------------------------------------------------------+
| sm4_decrypt(from_base64('aDjwRflBrDjhBZIOFNw3Tg=='), '***', '', 'SM4_128_ECB') |
+--------------------------------------------------------------------------------+
| text                                                                           |
+--------------------------------------------------------------------------------+
1 row in set (0.19 sec)

MySQL> set block_encryption_mode="SM4_128_CBC";
Query OK, 0 rows affected (0.006 sec)

mysql> select SM4_DECRYPT(FROM_BASE64('FSYstvOmH2cXy7B/072Mug=='),'F3229A0B371ED2D9441B830D21A390C3');
+--------------------------------------------------------------------------------+
| sm4_decrypt(from_base64('FSYstvOmH2cXy7B/072Mug=='), '***', '', 'SM4_128_CBC') |
+--------------------------------------------------------------------------------+
| text                                                                           |
+--------------------------------------------------------------------------------+
1 row in set (0.11 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