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MimeKit

SmtpClientSslCipherStrength Property

Get the negotiated SSL or TLS cipher algorithm strength.

Namespace:  MailKit.Net.Smtp
Assembly:  MailKit (in MailKit.dll) Version: 2.14.0
Syntax
C#
public override int? SslCipherStrength { get; }

Property Value

Type: NullableInt32
The negotiated SSL or TLS cipher algorithm strength.

Implements

IMailServiceSslCipherStrength
IMailServiceSslCipherStrength
Remarks
Gets the negotiated SSL or TLS cipher algorithm strength once an SSL or TLS connection has been made.
Examples
C#
public static void PrintSslConnectionInfo (string host, int port)
{
    using (var client = new SmtpClient ()) {
        client.Connect (host, port, SecureSocketOptions.Auto);

        Console.WriteLine ($"Negotiated the following SSL options with {host}:");
        Console.WriteLine ($"        Protocol Version: {client.SslProtocol}");
        Console.WriteLine ($"        Cipher Algorithm: {client.SslCipherAlgorithm}");
        Console.WriteLine ($"         Cipher Strength: {client.SslCipherStrength}");
        Console.WriteLine ($"          Hash Algorithm: {client.SslHashAlgorithm}");
        Console.WriteLine ($"           Hash Strength: {client.SslHashStrength}");
        Console.WriteLine ($"  Key-Exchange Algorithm: {client.SslKeyExchangeAlgorithm}");
        Console.WriteLine ($"   Key-Exchange Strength: {client.SslKeyExchangeStrength}");

        // Example Log:
        // 
        // Negotiated the following SSL options with smtp.gmail.com:
        //         Protocol Version: Tls12
        //         Cipher Algorithm: Aes128
        //          Cipher Strength: 128
        //           Hash Algorithm: Sha256
        //            Hash Strength: 0
        //   Key-Exchange Algorithm: 44550
        //    Key-Exchange Strength: 255

        client.Disconnect (true);
    }
}
See Also