Encrypt Method

Encrypts the current message.

Syntax

cmscontrol.Encrypt 

Remarks

Encrypt encrypts the input data with the the specified certificate(s). Certificates are specified by calling AddRecipientCert or setting the RecipientCerts property.

OutputFormat specifies the encoding of the output message. Valid values are PEM, DER, and SMIME. Additional settings allow further configuration. The following properties are applicable when calling this method:

• RecipientCerts (required)
• EncryptionAlgorithm
• OutputFormat
• UseOAEP

Input and Output Properties

The control will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• InputFile
• InputMessage

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

Encrypt and Decrypt a message

Cms cms = new Cms();
cms.RecipientCerts.Add(new Certificate(CertStoreTypes.cstPublicKeyFile, @"C:\temp\test.cer", "", "*"));
cms.InputMessage = "My Data";
cms.Encrypt();

string encryptedMessage = cms.OutputMessage;

cms = new Cms();
cms.InputMessage = encryptedMessage;
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.Decrypt();

string plaintextMessage = cms.OutputMessage;

Cms cms = new Cms();
cms.RecipientCerts.Add(new Certificate(CertStoreTypes.cstPublicKeyFile, @"C:\temp\test.cer", "", "*"));
cms.InputMessage = "My Data";
cms.OutputFormat = "DER";
cms.Encrypt();

byte[] encryptedMessage = cms.OutputMessageB; //Binary output

cms = new Cms();
cms.InputMessageB = encryptedMessage;
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.Decrypt();

string plaintextMessage = cms.OutputMessage;

Cms cms = new Cms();
cms.RecipientCerts.Add(new Certificate(CertStoreTypes.cstPublicKeyFile, @"C:\temp\test.cer", "", "*"));
cms.RecipientCerts.Add(new Certificate(CertStoreTypes.cstPublicKeyFile, @"C:\temp\test2.cer", "", "*"));
cms.InputMessage = "My Data";
cms.Encrypt();

string encryptedMessage = cms.OutputMessage;

cms = new Cms();
cms.InputMessage = encryptedMessage;
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.Decrypt();

string plaintextMessage = cms.OutputMessage;

Cms cms = new Cms();
cms.RecipientCerts.Add(new Certificate(CertStoreTypes.cstPublicKeyFile, @"C:\temp\test.cer", "", "*"));
cms.InputMessage = "My Data";
cms.Encrypt();

string encryptedMessage = cms.OutputMessage;

//If the recipient certificate is not known ahead of time the GetRecipientInfo method may be called
//to find information about the certificate.
cms = new Cms();
cms.InputMessage = encryptedMessage;
cms.OnRecipientInfo += (s, e) => {
  Console.WriteLine(e.SerialNumber);
  Console.WriteLine(e.Issuer);
  if (e.Issuer == "CN=100") //Identify the certificate to load based on event params
  {
    cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
  }
};

cms.GetRecipientInfo();
cms.Decrypt();

string plaintextMessage = cms.OutputMessage;