SHA2

描述

使用SHA2对信息进行摘要处理。

语法

SHA2( <str>, <digest_length>)

参数

参数	说明
<str>	待加密的内容
<digest_length>	摘要长度，支持 224, 256, 384, 512

返回值

返回输入字符串的sha2值

示例

select sha2('abc', 224), sha2('abc', 384), sha2(NULL, 512);

+----------------------------------------------------------+--------------------------------------------------------------------------------------------------+-----------------+
| sha2('abc', 224)                                         | sha2('abc', 384)                                                                                 | sha2(NULL, 512) |
+----------------------------------------------------------+--------------------------------------------------------------------------------------------------+-----------------+
| 23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7 | cb00753f45a35e8bb5a03d699ac65007272c32ab0eded1631a8b605a43ff5bed8086072ba1e7cc2358baeca134c825a7 | NULL            |
+----------------------------------------------------------+--------------------------------------------------------------------------------------------------+-----------------+