SmtpMail.EncryptionAlgorithm Property

Gets or sets the algorithm for email encryption.

[Visual Basic]
Public Property EncryptionAlgorithm As EncryptionAlgorithmType

[C#]
public EncryptionAlgorithmType EncryptionAlgorithm {get; set;}

[C++]
public: __property EncryptionAlgorithmType^ get_EncryptionAlgorithm();
public: __property void set_EncryptionAlgorithm(EncryptionAlgorithmType^);

[JScript]
public function get EncryptionAlgorithm() : EncryptionAlgorithmType;
public function set EncryptionAlgorithm(EncryptionAlgorithmType);

Property Value

Example

[Visual Basic, C#] The following example demonstrates how to send email with EASendMail SMTP Component. To get the full samples of EASendMail, please refer to Samples section.

[VB - Encrypt Email]

Dim oMail As SmtpMail = New SmtpMail("TryIt")
oMail.From = New MailAddress("test@adminsystem.com")
oMail.To = New AddressCollection("encrypt1@adminsystem.com, encrypt2@adminsystem.com")

For i As Integer = 0 To oMail.To.Count - 1
    Dim recipient As MailAddress = oMail.To(i)
    Try
        ' Find certificate by email adddress in My Other Peoples Store.
        ' The certificate can be imported by *.cer file like this: 
        ' recipient.Certificate.Load("c:\encrypt1.cer")
        ' Once the certificate Is loaded to MailAddress, the email content will be encrypted automatically
        recipient.Certificate.FindSubject(recipient.Address,
                Certificate.CertificateStoreLocation.CERT_SYSTEM_STORE_CURRENT_USER,
                "AddressBook")
    Catch
        Try
            ' No certificate found in AddressBook, lookup it in My 
            recipient.Certificate.FindSubject(recipient.Address,
                Certificate.CertificateStoreLocation.CERT_SYSTEM_STORE_CURRENT_USER,
                "My")
        Catch ex As Exception
            Console.WriteLine("No encryption certificate found for {0} - {1}", recipient.Address, ex.Message)
        End Try
    End Try
Next

' AES128 encryption + RSA-OAEP
oMail.EncryptionAlgorithm = EncryptionAlgorithmType.ENCRYPTION_ALGORITHM_AES128


[C# - Encrypt Email]

SmtpMail oMail = new SmtpMail("TryIt");
oMail.From = "test@adminsystem.com";
oMail.To = "encrypt1@adminsystem.com, encrypt2@adminsystem.com";

for (int i = 0; i < oMail.To.Count; i++)
{
    MailAddress recipient = oMail.To[i] as MailAddress;
    try
    {
        // Find certificate by email adddress in My Other Peoples Store.
        // The certificate can be also imported by *.cer file like this: 
        // recipient.Certificate.Load("c:\\encrypt1.cer");
        // Once the certificate is loaded to MailAddress, the email content will be encrypted automatically

        recipient.Certificate.FindSubject(recipient.Address,
            Certificate.CertificateStoreLocation.CERT_SYSTEM_STORE_CURRENT_USER,
            "AddressBook");
    }
    catch
    {
        try
        {
            // No certificate found in AddressBook, lookup it in My
            recipient.Certificate.FindSubject(recipient.Address,
                Certificate.CertificateStoreLocation.CERT_SYSTEM_STORE_CURRENT_USER,
                "My");
        }
        catch (Exception exp)
        {
            Console.WriteLine("No encryption certificate found for {0} - {1}", recipient.Address, exp.Message);
        }
    }

    // AES128 encryption + RSA-OAEP
    oMail.EncryptionAlgorithm = EncryptionAlgorithmType.ENCRYPTION_ALGORITHM_AES128;
}


[VB - Find Certificate in Active Directory by LDAP]

Dim oMail As SmtpMail = New SmtpMail("TryIt")
oMail.From = New MailAddress("test@adminsystem.com")
oMail.To = New AddressCollection("Encryptor <encrypt@adminsystem.com>")

For i As Integer = 0 To oMail.To.Count - 1
    Dim recipient As MailAddress = oMail.To(i)
    Try
        ' Please change the ldap path as your environment.
        recipient.Certificate.FindSubject(recipient.Address,
            Certificate.CertificateStoreLocation.CERT_STORE_PROV_LDAP_STORE,
            String.Format("ldap:///CN={0},CN=USERS,DC=my,DC=server?userCertificate", recipient.Name))
    Catch exp As Exception
        Console.WriteLine("No encryption certificate found for {0} - {1}", recipient.Address, exp.Message)
    End Try
Next

' AES128 encryption + RSA-OAEP
oMail.EncryptionAlgorithm = EncryptionAlgorithmType.ENCRYPTION_ALGORITHM_AES128


[C# - Find Certificate in Active Directory by LDAP]

SmtpMail oMail = new SmtpMail("TryIt");
oMail.From = "test@adminsystem.com";
oMail.To = "Encryptor <encrypt@adminsystem.com>";

for (int i = 0; i < oMail.To.Count; i++)
{
    MailAddress recipient = oMail.To[i] as MailAddress;
    try
    {
        // Please change the ldap path as your environment.
        recipient.Certificate.FindSubject(recipient.Address,
            Certificate.CertificateStoreLocation.CERT_STORE_PROV_LDAP_STORE,
            String.Format("ldap:///CN={0},CN=USERS,DC=my,DC=server?userCertificate", recipient.Name));
    }
    catch (Exception exp)
    {
        Console.WriteLine("No encryption certificate found for {0} - {1}", recipient.Address, exp.Message);
    }
}

// AES128 encryption + RSA-OAEP
oMail.EncryptionAlgorithm = EncryptionAlgorithmType.ENCRYPTION_ALGORITHM_AES128;

Encryption Algorithm

You can use EncryptionAlgorithm property to set encryption algorithm to RC2, RC4, 3DES, AES128 (RSAES-OAEP), AES192 (RSAES-OAEP) or AES256 (RSAES-OAEP).

RSA-OAEP Encryption with SHA256

If you need to use RSA-OAEP encryption with sha256 scheme, please have a look at this topic:
RSASSA-PSS + RSA-OAEP Encryption with SHA256

See Also