SHA2

描述

使用SHA2对信息进行摘要处理。

语法

SHA2(str, digest_length)

参数

• str: 待加密的内容
• digest_length: 摘要长度，支持 224, 256, 384, 512

示例

select sha2('abc', 224);

+----------------------------------------------------------+
| sha2('abc', 224)                                         |
+----------------------------------------------------------+
| 23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7 |
+----------------------------------------------------------+

select sha2('abc', 384);

+--------------------------------------------------------------------------------------------------+
| sha2('abc', 384)                                                                                 |
+--------------------------------------------------------------------------------------------------+
| cb00753f45a35e8bb5a03d699ac65007272c32ab0eded1631a8b605a43ff5bed8086072ba1e7cc2358baeca134c825a7 |
+--------------------------------------------------------------------------------------------------+

select sha2(NULL, 512);

+-----------------+
| sha2(NULL, 512) |
+-----------------+
| NULL            |
+-----------------+