您好我正在尝试在Android上的Flexiprovider - How to encrypt/de with formatted keypair中实现anindonesian提供的代码。
我收到了kpg.initialize(brainpoolP160R1)的NullPointerException;
我是Android和密码学的新手,所以任何帮助都会受到赞赏。 在这里,我刚刚创建了一个生成ECC密钥的页面,并对一些数据进行加密/解密,并将其显示在文本框中。
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Base64;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
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.Security;
import java.security.spec.ECGenParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
public class ECC_page extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ecc_page);
Security.addProvider(new BouncyCastleProvider());
KeyPairGenerator kpg = null;
try {
kpg = KeyPairGenerator.getInstance("ECIES", "BC");
} catch (NoSuchAlgorithmException | NoSuchProviderException e) {
e.printStackTrace();
}
ECGenParameterSpec brainpoolP160R1 = new ECGenParameterSpec("brainpoolP160R1");
try {
assert kpg != null;
kpg.initialize(brainpoolP160R1); //I am getting the error here
} catch (InvalidAlgorithmParameterException ignored) {
}
KeyPair kp = kpg.generateKeyPair();
PublicKey publicKey = kp.getPublic();
PrivateKey privateKey = kp.getPrivate();
byte[] PublicKey = publicKey.getEncoded();
byte[] PrivateKey = privateKey.getEncoded();
Cipher c = null;
try {
c = Cipher.getInstance("ECIESWithAES/DHAES/NoPadding", "BC");
} catch (NoSuchAlgorithmException | NoSuchPaddingException | NoSuchProviderException e) {
e.printStackTrace();
}
try {
c.init(Cipher.ENCRYPT_MODE, publicKey);
} catch (InvalidKeyException e) {
e.printStackTrace();
}
byte[] cipher = new byte[0];
try {
cipher = c.doFinal("This is the message".getBytes());
} catch (IllegalBlockSizeException | BadPaddingException e) {
e.printStackTrace();
}
TextView eccencoded = (TextView) findViewById(R.id.eccencoded);
eccencoded.setText("[ENCODED]:\n" +
Base64.encodeToString(cipher, Base64.DEFAULT) + "\n");
try {
c.init(Cipher.DECRYPT_MODE, privateKey);
} catch (InvalidKeyException e) {
e.printStackTrace();
}
byte[] plaintext = new byte[0];
try {
plaintext = c.doFinal(cipher);
} catch (IllegalBlockSizeException | BadPaddingException e) {
e.printStackTrace();
}
TextView eccdecoded = (TextView) findViewById(R.id.eccdecoded);
eccdecoded.setText("[DECODED]:\n" +
Base64.encodeToString(plaintext, Base64.DEFAULT) + "\n");
}
}
我在我的libs文件夹中插入了 apacheds-all-1.5.5.jar ..
错误是 java.security.NoSuchAlgorithmException:未找到KeyPairGenerator ECIES实现 引起:java.lang.NullPointerException 在com.example.vinay.myapplication.ECC_page.onCreate(ECC_page.java:47)
如果可能的话,请指出代码中的任何错误...... 要插入的jar文件是由android studio提出的。
答案 0 :(得分:0)
FlexiProvider不是Bouncy Castle("BC"
)。
尝试:
kpg = KeyPairGenerator.getInstance("ECIES");
或:
kpg = KeyPairGenerator.getInstance("ECIES", "FlexiEC");
用于特定提供商选择。
请注意,Elliptic Curve密钥对生成对于ECDH(密钥协商),ECDSA(数字签名生成)和ECIES(混合加密)是同义词。所以你也可以尝试:
kpg = KeyPairGenerator.getInstance("EC");
或:
kpg = KeyPairGenerator.getInstance("EC", "FlexiEC");
添加flexi提供程序而不是Bouncy Castle提供程序也可能有所帮助:
Security.addProvider(new BouncyCastleProvider());
显然也是不正确的。