Android™

Select the RSA Signature Scheme for Signed Email

Demonstrates the Chilkat Email.SigningAlg property, which selects the signature algorithm used when sending signed (PKCS#7) email. The default is PKCS1-v1_5; set it to RSASSA-PSS (or simply pss) to use the RSASSA-PSS scheme. This applies only when signing with an RSA private key — it has no effect for ECC or DSA keys, and the chosen scheme must be supported by the private-key provider. This example selects RSASSA-PSS.

Background: There are two common ways to build an RSA signature. The older PKCS1-v1_5 scheme is deterministic and still widely used, while RSASSA-PSS adds randomized "salt" to the padding, giving it a stronger security proof and making it the modern recommendation. This property picks the padding scheme for the signature; it is distinct from SigningHashAlg, which chooses the hash function (such as SHA-256) that the scheme signs.

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //  Demonstrates the Email.SigningAlg property, which selects the signature scheme used
    //  when sending signed (PKCS#7) email.  The default is PKCS1-v1_5.  Set it to RSASSA-PSS
    //  (or simply "pss") to use the RSASSA-PSS scheme.  This applies only to RSA signing.

    CkEmail email = new CkEmail();

    //  Use the RSASSA-PSS signature scheme instead of the default PKCS1-v1_5.
    email.put_SigningAlg("RSASSA-PSS");

    Log.i(TAG, "SigningAlg = " + email.signingAlg());

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}