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(Android™) Create CMS Signed File (PDF) with Multiple Signing CertificatesDemonstrates how to sign a file by adding multiple signatures (multiple certificates). This example signs a PDF file to produce an output file that is a CMS signature wrapping the original PDF. (Note: This is different than modifying a PDF by injecting a signature into the PDF file format.) Note: This example requires Chilkat v9.5.0.83 or greater.
// 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 assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkCrypt2 crypt = new CkCrypt2(); // ------------ This example requires Chilkat v9.5.0.83 or greater. CkCert cert1 = new CkCert(); boolean success = cert1.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123"); if (success != true) { Log.i(TAG, cert1.lastErrorText()); return; } CkCert cert2 = new CkCert(); success = cert2.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret"); if (success != true) { Log.i(TAG, cert2.lastErrorText()); return; } // ------------ This example requires Chilkat v9.5.0.83 or greater. // Tell the crypt component to use both certificates for signing. // When we create the signature, it will be signed by both certificates. success = crypt.AddSigningCert(cert1); if (success != true) { Log.i(TAG, crypt.lastErrorText()); return; } success = crypt.AddSigningCert(cert2); if (success != true) { Log.i(TAG, crypt.lastErrorText()); return; } // The CadesEnabled property applies to all methods that create PKCS7 signatures. // To create a CAdES-BES signature, set this property equal to true. crypt.put_CadesEnabled(true); crypt.put_HashAlgorithm("sha256"); // We can sign any type of file, creating a .p7s as output. // The .p7s contains the signature and also embeds the data of the file that is signed. String inFile = "qa_data/pdf/sample.pdf"; String p7sFile = "qa_output/sample.pdf.p7s"; // Create the CAdES-BES attached signature, which contains the original data. // Note: Chilkat's function naming is not accurate. CreateP7M creates a PKCS7 signature where the signed file // is contained within the signature. CreateP7S creates a detached PKCS7 signature where the signed file // is NOT contained within the signature. We want the data to be contained in the signature, therefore // we call CreateP7M even though we are naming our output file .p7s. success = crypt.CreateP7M(inFile,p7sFile); if (success == false) { Log.i(TAG, crypt.lastErrorText()); return; } // Verify the .p7s file and extract the original file from the .p7s. String extractedToFilePath = "qa_output/sample.pdf"; success = crypt.VerifyP7M(p7sFile,extractedToFilePath); if (success == false) { Log.i(TAG, crypt.lastErrorText()); return; } Log.i(TAG, "Success!"); } 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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