在C#中复制T-SQL DecryptByPassPhrase

时间:2012-11-29 02:18:22

标签: c# sql encryption 3des

我想创建一个C#类来解密使用T-SQL的EncryptByPassPhrase加密的字节数组。 (是的,我知道我可以在SQL Server中解密,但我需要的是能够在数据库层和中间层中等效地加密/解密。)

据我所知,SQL Server的EncryptByPassPhrase和DecryptByPassPhrase使用TripleDES对称密钥算法。但是,我不清楚IV应该模拟SQL Server的密码学。我可以使用TripleDESCryptoServiceProvider类加密/解密,但我找不到正确的密钥和IV实现来复制SQL Server正在做的事情。

有没有人做过类似的事情?谢谢!

2 个答案:

答案 0 :(得分:1)

github 上有一个公共存储库,可以在 C# 中重新创建 EncryptByPassPhrase,并且随着实现的更改,IV 取决于 SQL Server 的版本。您可以查看代码的 repo。 https://github.com/krcs/SQLServerCrypto

答案 1 :(得分:-2)

(1)使用C#生成密钥/ iv对:                 TripleDESCryptoServiceProvider cp = new TripleDESCryptoServiceProvider();

            MemoryStream m = new MemoryStream(Convert.FromBase64String(Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(plainText))));

            CryptoStream cs = new CryptoStream(m, cp.CreateEncryptor(cp.Key, cp.IV), CryptoStreamMode.Read);

            cp.Key = Convert.FromBase64String("BeaYzNeHfDb27OFYgaYHUd5HUJE2aZyI");
            cp.IV = Convert.FromBase64String("T/ENF5G4sCA=");

            string key = Convert.ToBase64String(cp.Key);
            string iv = Convert.ToBase64String(cp.IV);
            // write key/iv to a file here 

(2)一旦我们有了这个,就用这样的代码来编码

            TripleDESCryptoServiceProvider cp = new TripleDESCryptoServiceProvider();
            MemoryStream m = new MemoryStream(Convert.FromBase64String(Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(plainText))));

            CryptoStream cs = new CryptoStream(m, cp.CreateEncryptor(cp.Key, cp.IV), CryptoStreamMode.Read);

            cp.Key = Convert.FromBase64String("the key value from above");
            cp.IV = Convert.FromBase64String("the iv value from above");

            string key = Convert.ToBase64String(cp.Key);
            string iv = Convert.ToBase64String(cp.IV);

            List<byte> r = new List<byte>();
            int x = 0;
            for (; x > -1; )
            {
                x = cs.ReadByte();
                if (x > -1)
                    r.Add((byte)x);
            }
            byte[] y = r.ToArray();
            string cypherText = Convert.ToBase64String(y);

(3)然后解码:

            TripleDESCryptoServiceProvider cp = new TripleDESCryptoServiceProvider();
            MemoryStream m = new MemoryStream(Convert.FromBase64String(cypherText));
            cp.Key = Convert.FromBase64String("the key value from above");
            cp.IV = Convert.FromBase64String("the iv value from above");

            CryptoStream cs = new CryptoStream(m, cp.CreateDecryptor(cp.Key, cp.IV), CryptoStreamMode.Read);

            StreamReader reader = new StreamReader(cs);
            string plainText = reader.ReadToEnd();