import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
 import java.io.*;
 import java.security.Key;
 import java.security.KeyStore;
 import java.security.PrivateKey;
 import java.security.Signature;
 import java.security.cert.Certificate;
 public class Sign {
 public static void main(String[] args) throws Exception {
 // TODO code application logic here
 BufferedReader reader = new BufferedReader(new FileReader("c:
cert.p12"));
 StringBuilder fullText = new StringBuilder();
 String line = reader.readLine();
 while (line != null) {
 fullText.append(line);
 line = reader.readLine();
 }
 KeyStore p12 = KeyStore.getInstance("pkcs12");
 p12.load(new FileInputStream("c:
cert.p12"), "Hfrtnf$5".toCharArray());

 //????????? ????????? ????, ??? ????? ????? ???????????? alias ? ??????
 //Key key = p12.getKey("my kkb key", "ryba-mech".toCharArray());
 Key key = (Key) p12.getKey("my kkb key", "Hfrtnf$5".toCharArray());
 Certificate userCert = (Certificate) p12.getCertificate("my kkb key");
 String base64Cert = new String(Base64.encode(userCert.getEncoded()));
 //signing
 Signature signer = Signature.getInstance("SHA1withRSA");
 signer.initSign((PrivateKey) key);
 signer.update(fullText.toString().getBytes());
 byte[] digitalSignature = signer.sign();
 String base64sign = new String(Base64.encode(digitalSignature));
 String base64Xml = new String(Base64.encode(fullText.toString().getBytes()));

 System.out.println("<certificate>" + base64Cert+"</certificate>");
 System.out.println("<xmlBody>" + base64Xml+"</xmlBody>");
 System.out.println("<signature>" + base64sign+"</signature>");
 }
 }