我尝试在 java 中编写一个加密包，它包装了 javax.crypto 包并使其使用起来更舒适。所以我实现了一个只包装 javax.crypto 的 RSACore 类。然后我实现了两个类 RSAEncoder 和 RSADecoder 来隐藏 javax.crypto.Cipher 和它的启动。
现在我的问题是：我已经为 RSACore、RSAEncoder 和 RSADecoder 编写了一些小测试。除了解码器的测试之外，所有测试都可以正常工作。当我对编码数据调用 dofinal() 时，我每次都会收到 BadPaddingException。我用谷歌搜索它，发现在大多数情况下它与错误的键有关，但我确信我只生成一对并处理它。我不知道在哪里搜索错误。作为提供者，我使用 bouncycastle，因为在使用 JCE 时，我收到一个错误，即无法使用 OAEP 进行签名以下是完整的错误消息：
javax.crypto.BadPaddingException: data hash wrong
at org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi.engineDoFinal(Unknown Source)
at javax.crypto.Cipher.doFinal(Cipher.java:2145)
at de.coding.crypto.rsa.RSACore.doFinal(RSACore.java:178)
at de.coding.crypto.rsa.RSADecoder.doFinal(RSADecoder.java:59)
at de.coding.crypto.interfaces.AbstractDecoder.doFinal(AbstractDecoder.java:49)
at de.coding.crypto.rsa.RSADecoderTest.test(RSADecoderTest.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
这是测试：
package de.coding.crypto.rsa;
import static org.junit.Assert.*;
import java.security.KeyPair;
import org.junit.Test;
public class RSADecoderTest
{
@Test
public void test()
{
try
{
KeyPair kp = RSACore.generateKeys();
String str = "Hello world! This is me. Life should be fun for everyone.";
RSAEncoder encoder = new RSAEncoder(kp.getPublic());
byte[] encoded = encoder.doFinal(str.getBytes());
RSADecoder decoder = new RSADecoder(kp.getPrivate());
byte[] decoded = decoder.doFinal(encoded);//<-------------------BadPaddingException
assertTrue(str.getBytes().length == decoded.length);
int size = decoded.length;
for (int i=0; i<size; i++)
{
assertTrue(decoded[i] == str.getBytes()[i]);
}
}
catch (Exception e)
{
fail();
}
}
}
你看到有什么逻辑错误吗？我也可以发布编码器、解码器和核心，但那是很多行。感谢您的阅读和帮助！
RSA编码器：
public RSAEncoder(PublicKey key) throws InvalidKeyException
{
super();
cipher = RSACore.initEncodeMode(key);
}
public byte[] doFinal()
{
try
{
buffer.add(RSACore.doFinal(cipher));//buffer is a LinkedList<byte[]>
return clearBuffer();
}
catch (IllegalBlockSizeException e)
{
throw new RuntimeException(e);
}
catch (BadPaddingException e)
{
throw new RuntimeException(e);
}
}
protected byte[] clearBuffer()
{
byte[] ret = new byte[getBufferSize()];
int index = 0;
for (byte[] b : buffer)
{
if (b != null)
{
for (int i=0; i<b.length; i++)
{
ret[index] = b[i];
}
}
}
buffer.clear();
return ret;
}
public byte[] doFinal(byte[] b, int offset, int length)
{
if (length > RSACore.KEYSIZE-11)
{
update(b, offset, length);
return doFinal();
}
else
{
try
{
buffer.add(RSACore.doFinal(cipher, b, offset, length));
return clearBuffer();
}
catch (IllegalBlockSizeException e)
{
throw new RuntimeException(e);
}
catch (BadPaddingException e)
{
throw new RuntimeException(e);
}
}
}
RSADecoder（除 condtructor 外相同）：
public RSADecoder(PrivateKey key) throws InvalidKeyException
{
cipher = RSACore.initDecodeMode(key);
}
RSA核心：
public byte[] doFinal(byte[] b)
{
return doFinal(b, 0, b.length);
}
public static byte[] doFinal(Cipher cipher, byte[] msg, int offset, int length) throws IllegalBlockSizeException, BadPaddingException
{
byte[] ret = cipher.doFinal(msg, offset, length);
if (ret == null)
{
return new byte[0];
}
return ret;
}
public static Cipher initEncodeMode(Key key) throws InvalidKeyException
{
try
{
Cipher cipher = Cipher.getInstance(ALGORITHMDETAIL, PROVIDER);
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher;
}
catch (NoSuchAlgorithmException e)
{
throw new RuntimeException(e);
}
catch (NoSuchPaddingException e)
{
throw new RuntimeException(e);
}
catch (NoSuchProviderException e)
{
throw new RuntimeException(e);
}
}
public static Cipher initDecodeMode(Key key) throws InvalidKeyException
{
try
{
Cipher cipher = Cipher.getInstance(ALGORITHMDETAIL, PROVIDER);
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher;
}
catch (NoSuchAlgorithmException e)
{
throw new RuntimeException(e);
}
catch (NoSuchPaddingException e)
{
throw new RuntimeException(e);
}
catch (NoSuchProviderException e)
{
throw new RuntimeException(e);
}
}