我正在尝试将 varbinary
参数与 Dapper.NET 一起使用,如下所示
string secret = "secret";
// from SELECT ENCRYPTBYPASSPHRASE('secret', N'xx') >>;
string ciphertext = "0x01000000393FE233AE939CA815AB744DDC39667860B3B630C82F36F7";
using (var conn = new SqlConnection(...))
{
var result = conn.ExecuteScalar(@"SELECT CONVERT(NVARCHAR(4000), DECRYPTBYPASSPHRASE(@secret, @ciphertext)) as decrypted",
new
{
secret,
ciphertext = Encoding.Unicode.GetBytes(ciphertext)
});
}
但是结果是null
。但如果我直接运行 SQL,它会返回一个有效结果,例如。
SELECT CONVERT(NVARCHAR(40), DECRYPTBYPASSPHRASE('secret', 0x01000000393FE233AE939CA815AB744DDC39667860B3B630C82F36F7))
返回xx
,即加密后的文本。
知道我做错了什么吗?
最佳答案
只是为了有人觉得有用,以下工作(感谢@Rob 上面的评论)
public string Encrypt(string secret, string unprotectedText)
{
using (var conn = new SqlConnection(...))
{
var x = conn.ExecuteScalar(@"SELECT ENCRYPTBYPASSPHRASE(@secret, @text)",
new { secret, text });
return ByteArrayToString((byte[])x);
}
}
public string Decrypt(string secret, string ciphertext)
{
using (var conn = new SqlConnection(...))
{
return conn.ExecuteScalar(@"SELECT CONVERT(NVARCHAR(4000), DECRYPTBYPASSPHRASE(@secret, @ciphertext))",
new { secret, ciphertext = StringToByteArray(ciphertext) }).ToString();
}
}
hexstring-to-bytes 和 bytes-to-hexstring 函数是
public static byte[] StringToByteArray(string hex)
{
int startIndex = 0;
if (hex.StartsWith("0x", StringComparison.InvariantCultureIgnoreCase))
startIndex = 2;
return Enumerable.Range(startIndex, hex.Length - startIndex)
.Where(x => x % 2 == 0)
.Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
.ToArray();
}
public static string ByteArrayToString(byte[] arr)
{
return "0x" + BitConverter.ToString(arr).Replace("-", String.Empty);
}
关于c# - 在 Dapper.NET 中使用 varbinary 参数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39843866/