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POHow to retrieve my public and private key from the keystore we created
 

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  1. POHow to retrieve my public and private key from the keystore we created
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    <p>My task is the following:</p> <ul> <li>Retrieve my public and private key from the keystore I created.</li> <li>Use these keys to encrypt a paragraph using my RSA 2048-bit public key.</li> <li>Digitally sign the result using the DSA-SHA-1 signature algorithm.</li> <li>Save the digital signature output on a file called <code>output.dat</code>.</li> </ul> <p>The program below is throwing error : "java.security.InvalidKeyException: No installed provider supports this key: sun.security.provider.DSAPublicKeyImpl".</p> <pre><code>import java.security.*; import java.security.KeyStore.*; import java.io.*; import java.security.PublicKey; import java.security.PrivateKey; import javax.crypto.Cipher; import java.nio.charset.*; import sun.security.provider.*; import javax.crypto.*; public class Code { /** * @param args the command line arguments */ public static void main(String[] args) { try { /* getting data for keystore */ File file = new File(System.getProperty("user.home") + File.separatorChar + ".keystore"); FileInputStream is = new FileInputStream(file); KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType()); /*Information for certificate to be generated */ String password = "abcde"; String alias = "mykeys"; String alias1 = "skeys"; String filepath ="C:\\email.txt"; /* getting the key*/ keystore.load(is, password.toCharArray()); PrivateKey key = (PrivateKey)keystore.getKey(alias, "bemylife".toCharArray()); //PrivateKey key = cert1.getPrivateKey(); //PublicKey key1= (PrivateKey)key; /* Get certificate of public key */ java.security.cert.Certificate cert = keystore.getCertificate(alias); /* Here it prints the public key*/ System.out.println("Public Key:"); System.out.println(cert.getPublicKey()); /* Here it prints the private key*/ System.out.println("\nPrivate Key:"); System.out.println(key); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE,cert.getPublicKey()); String cleartextFile = "C:\\email.txt"; String ciphertextFile = "D:\\ciphertextRSA.png"; FileInputStream fis = new FileInputStream(cleartextFile); FileOutputStream fos = new FileOutputStream(ciphertextFile); CipherOutputStream cos = new CipherOutputStream(fos, cipher); byte[] block = new byte[32]; int i; while ((i = fis.read(block)) != -1) { cos.write(block, 0, i); } cos.close(); /* computing the signature*/ Signature dsa = Signature.getInstance("SHA1withDSA", "SUN"); dsa.initSign(key); FileInputStream f = new FileInputStream(ciphertextFile); BufferedInputStream in = new BufferedInputStream(f); byte[] buffer = new byte[1024]; int len; while ((len = in.read(buffer)) &gt;= 0) { dsa.update(buffer, 0, len); }; in.close(); /* Here it prints the signature*/ System.out.println("Digital Signature :"); System.out.println( dsa.sign()); /* Now Exporting Certificate */ System.out.println("Exporting Certificate. "); byte[] buffer_out = cert.getEncoded(); FileOutputStream os = new FileOutputStream(new File("d:\\signedcetificate.cer")); os.write(buffer_out); os.close(); /* writing signature to output.dat file */ byte[] buffer_out1 = dsa.sign(); FileOutputStream os1 = new FileOutputStream(new File("d:\\output.dat")); os1.write(buffer_out1); os1.close(); } catch (Exception e) {System.out.println(e);} } } </code></pre>
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    1. COI believe this is more programming related (Implementation details), rather than security related.
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      1. POHow to retrieve my public and private key from the keystore we created
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    2. COCan you verify that the alias of your public/private keypair in your keystore is "skeys"? If it isn't it would explain why your public key couldn't be found. You can check with keytool: keytool -list -v -keystore ~/.keystore -alias "skeys"
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      1. POHow to retrieve my public and private key from the keystore we created
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    3. COThe change which I made is java.security.cert.Certificate cert = keystore.getCertificate(alias); instead of (alias1). Because upon your suggestion I tried to check for the alias1 name "skeys" is not there and now it is displaying the public and private key but another error which I mentioned above the program.
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