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    <p>Ok. I found some solution and change something. This is new class for public/private key storing and getting it again from stored string. This class works for me !</p> <pre><code>import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.PrivateKey; import java.security.PublicKey; import java.security.SecureRandom; import java.security.spec.InvalidKeySpecException; import java.security.spec.X509EncodedKeySpec; import org.bouncycastle.util.encoders.Base64; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; public class KeyGenerator extends Activity{ SharedPreferences SP; SharedPreferences.Editor SPE; PublicKey pubKey; PrivateKey privKey; Context context; public KeyGenerator(Context context){ this.context = context; SP = context.getSharedPreferences("KeyPair", MODE_PRIVATE); } public void generateKeys(){ try { KeyPairGenerator generator; generator = KeyPairGenerator.getInstance("RSA", "BC"); generator.initialize(256, new SecureRandom()); KeyPair pair = generator.generateKeyPair(); pubKey = pair.getPublic(); privKey = pair.getPrivate(); byte[] publicKeyBytes = pubKey.getEncoded(); String pubKeyStr = new String(Base64.encode(publicKeyBytes)); byte[] privKeyBytes = privKey.getEncoded(); String privKeyStr = new String(Base64.encode(privKeyBytes)); SPE = SP.edit(); SPE.putString("PublicKey", pubKeyStr); SPE.putString("PrivateKey", privKeyStr); SPE.commit(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchProviderException e) { e.printStackTrace(); } } public PublicKey getPublicKey(){ String pubKeyStr = SP.getString("PublicKey", ""); byte[] sigBytes = Base64.decode(pubKeyStr); X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(sigBytes); KeyFactory keyFact = null; try { keyFact = KeyFactory.getInstance("RSA", "BC"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchProviderException e) { e.printStackTrace(); } try { return keyFact.generatePublic(x509KeySpec); } catch (InvalidKeySpecException e) { e.printStackTrace(); } return null; } public String getPublicKeyAsString(){ return SP.getString("PublicKey", ""); } public PrivateKey getPrivateKey(){ String privKeyStr = SP.getString("PrivateKey", ""); byte[] sigBytes = Base64.decode(privKeyStr); X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(sigBytes); KeyFactory keyFact = null; try { keyFact = KeyFactory.getInstance("RSA", "BC"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchProviderException e) { e.printStackTrace(); } try { return keyFact.generatePrivate(x509KeySpec); } catch (InvalidKeySpecException e) { e.printStackTrace(); } return null; } public String getPrivateKeyAsString(){ return SP.getString("PrivateKey", ""); } } </code></pre>
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