SHA2

描述

使用 SHA2 对信息进行摘要处理。

语法

SHA2(<input>, <digest_length>)

参数

参数	说明
<input>	待加密的内容, 接受字符串和二进制类型
<digest_length>	摘要长度，支持 224, 256, 384, 512，必须为常量

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            |
+----------------------------------------------------------+--------------------------------------------------------------------------------------------------+-----------------+

select sha2('abc', 225);

ERROR 1105 (HY000): errCode = 2, detailMessage = sha2 functions only support digest length of [224, 256, 384, 512]

select sha2('str', k1) from str;

ERROR 1105 (HY000): errCode = 2, detailMessage = the second parameter of sha2 must be a literal but got: k1

select sha2(k0, k1) from str;

ERROR 1105 (HY000): errCode = 2, detailMessage = the second parameter of sha2 must be a literal but got: k1

-- vb (VarBinary) 和 vc (VarChar) 插入时使用了相同的字符串.
SELECT * FROM mysql_catalog.binary_test.binary_test;

+------+------------+------+
| id   | vb         | vc   |
+------+------------+------+
|    1 | 0x616263   | abc  |
|    2 | 0x78797A   | xyz  |
|    3 | NULL       | NULL |
+------+------------+------+

SELECT SHA2(vb, 224), SHA2(vc, 224) FROM mysql_catalog.binary_test.binary_test;

+----------------------------------------------------------+----------------------------------------------------------+
| SHA2(vb, 224)                                            | SHA2(vc, 224)                                            |
+----------------------------------------------------------+----------------------------------------------------------+
| 23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7 | 23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7 |
| 30e90f1cd0ceff8eb3dd6a540a605c0666f841d35de63c57e4dd2877 | 30e90f1cd0ceff8eb3dd6a540a605c0666f841d35de63c57e4dd2877 |
| NULL                                                     | NULL                                                     |
+----------------------------------------------------------+----------------------------------------------------------+