IPWorks Encrypt 2020 Android Edition

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Sign Method

Signs the current message.

Syntax

public void sign();

Remarks

Sign digitally signs the input data with the the specified certificate(s). Certificates are specified by calling AddCertificate or setting the Certificates property.

OutputFormat specifies the encoding of the output message. Valid values are PEM, DER, and SMIME. IncludeCertificates specifies whether the public certificate is included in the signed message. Additional settings allow further configuration. The following properties are applicable when calling this method:

Input and Output Properties

The component 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:

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

When using streams you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Sign and Verify a message

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

string signedMessage = cms.OutputMessage;

cms = new Cms();
cms.InputMessage = signedMessage;
cms.VerifySignature();

string plaintextMessage = cms.OutputMessage;
Sign and Verify a message - DER Output Format
Cms cms = new Cms();
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.InputMessage = "My Data";
cms.OutputFormat = "DER";
cms.Sign();

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

cms = new Cms();
cms.InputMessageB = signedMessage;
cms.VerifySignature();

string plaintextMessage = cms.OutputMessage;
Sign and Verify a message - Detached Signature
Cms cms = new Cms();
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.InputMessage = "My Data";
cms.DetachedSignature = true;
cms.Sign();

string signature = cms.OutputMessage;

cms = new Cms();
cms.InputMessage = "My Data";
cms.DetachedSignatureData = signature;
cms.DetachedSignature = true;
cms.VerifySignature();
Sign and Verify a message - Multiple Signatures
Cms cms = new Cms();
cms.InputMessage = "My Data";
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test2.pfx", "password2", "*"));
cms.Sign();

string signedMessage = cms.OutputMessage;

cms = new Cms();
cms.InputMessage = signedMessage;
cms.VerifySignature();

string plaintextMessage = cms.OutputMessage;
Sign and Verify a message - No Included Certificate
Cms cms = new Cms();
cms.InputMessage = "My Data";
cms.Certificates.Add(new Certificate(CertStoreTypes.cstPFXFile, @"C:\temp\test.pfx", "password", "*"));
cms.IncludeCertificates = CmsIncludeCertificates.icsNone;
cms.Sign();

string signedMessage = cms.OutputMessage;

cms = new Cms();
cms.OnSignerCertInfo += (s, e) => {
  Console.WriteLine(e.Issuer);
  Console.WriteLine(e.SerialNumber);
  if (e.Issuer == "CN=100") //Identify the certificate to load based on event params
  {
    //Load the correct signer certificate.
    cms.SignerCerts.Add(new Certificate(CertStoreTypes.cstPublicKeyFile, @"C:\temp\test.cer", "", "*"));
  }
};
cms.InputMessage = signedMessage;
cms.VerifySignature();

string plaintextMessage = cms.OutputMessage;

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IPWorks Encrypt 2020 Android Edition - Version 20.0 [Build 8161]