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(Android™) PKCS7 Sign Text using RSA 2048, SHA256, Base64 OutputDemonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file.
// 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); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkCert cert = new CkCert(); // Load the cert and private key. Whatever the private key happens to be, // such as RSA or ECC, then Chilkat will use it. If the private key is // a 2048-bit RSA key, then that's what will be used.. boolean success = cert.LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password"); if (success != true) { Log.i(TAG, cert.lastErrorText()); return; } CkCrypt2 crypt = new CkCrypt2(); success = crypt.SetSigningCert(cert); if (success != true) { Log.i(TAG, crypt.lastErrorText()); return; } // Use SHA-256 crypt.put_HashAlgorithm("sha256"); // Hash the utf-8 byte representation of the string crypt.put_Charset("utf-8"); // Return the result in base64 crypt.put_EncodingMode("base64"); // Sign some text.. String textToSign = "This is the text to be hashed and signed."; String sigBase64 = crypt.opaqueSignStringENC(textToSign); if (crypt.get_LastMethodSuccess() != true) { Log.i(TAG, crypt.lastErrorText()); return; } Log.i(TAG, sigBase64); // The result: // MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg== } 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." } } |
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