在SQL Server查询中解密密码

Question

CREATE ASYMMETRIC KEY Asym_EPassword  
WITH ALGORITHM = RSA_512 
ENCRYPTION BY PASSWORD = testdemo123

我用上面的加密非对称密钥加密了我桌子的Password列。

现在我想在password查询中解密select列

任何人都可以建议如何做到这一点？

Answer 1

SELECT CONVERT(NVARCHAR(100), 
    DecryptByAsymKey(AsymKey_ID('Asym_EPassword'),
    YourColumn, 'testdemo123')) AS PlainText
FROM YourTable;

SQLFiddle不允许用户创建非对称密钥，因此要将其复制/粘贴到您自己的SSMS：

CREATE ASYMMETRIC KEY Asym_EPassword
WITH ALGORITHM = RSA_512 
ENCRYPTION BY PASSWORD = 'testDemo123!'

DECLARE @PlainText NVARCHAR(100)
DECLARE @CipherText VARBINARY(MAX)

SET @PlainText = 'AAAAA'
SELECT @CipherText = EncryptByAsymKey(AsymKey_ID('Asym_EPassword'), @PlainText);

SELECT @CipherText;

SELECT CONVERT(NVARCHAR(100), DecryptByAsymKey(AsymKey_ID('Asym_EPassword'), @CipherText, N'testDemo123!'));