我正在使用带有弹力城堡的AES算法进行加密和解密
我的加密和解密工作正常，但是当我的纯文本大小较大时，它给我错误
甚至有时它会提供未解密的数据
public static boolean setEncryptionKey(String keyText)
{
byte[] keyBytes = keyText.getBytes();
key = new KeyParameter(keyBytes);
engine = new AESFastEngine();
cipher = new PaddedBufferedBlockCipher(engine);
return true;
}
加密:
public static String encryptString(String plainText)
{
byte[] plainArray = plainText.getBytes();
cipher.init(true, key);
byte[] cipherBytes = new byte[cipher.getOutputSize(plainArray.length)];
int cipherLength = cipher.processBytes(plainArray, 0, plainArray.length, cipherBytes, 0);
cipher.doFinal(cipherBytes, cipherLength);
String cipherString = new String(cipherBytes);
return cipherString;
}
解密:
public static String decryptString(String encryptedText)
{
byte[] cipherBytes = encryptedText.getBytes();
cipher.init(false, key);
byte[] decryptedBytes = new byte[cipher.getOutputSize(cipherBytes.length)];
int decryptedLength = cipher.processBytes(cipherBytes, 0, cipherBytes.length, decryptedBytes, 0);
cipher.doFinal(decryptedBytes, decryptedLength);
String decryptedString = new String(decryptedBytes);
int index = decryptedString.indexOf("\u0000");
if (index >= 0)
{
decryptedString = decryptedString.substring(0, index);
}
return decryptedString;
}
这种解密给我以下错误
org.bouncycastle.crypto.InvalidCipherTextException: pad block corrupted
at org.bouncycastle.crypto.paddings.PKCS7Padding.padCount(+30)
at org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher.doFinal(+190)
at com.NewCrypto.decryptString(NewCrypto.java:103)
at com.New_Midlet.startApp(New_Midlet.java:23)
at javax.microedition.midlet.MIDletProxy.startApp(MIDletProxy.java:44)
at com.sun.midp.midlet.Scheduler.schedule(Scheduler.java:375)
at com.sun.midp.main.Main.runLocalClass(Main.java:477)
at com.sun.midp.main.Main.main(+80)
可能是什么问题呢 ？
最佳答案
线
String cipherString = new String(cipherBytes);
是一个错误。
cipherBytes是具有任意值的字节数组，不能使用任何Java字符串解码器将其转换为字符串。您应该只将密码发送/保存为字节数组。如果必须将其设置为字符串，则必须使用编码器。经常使用Base64编码器，以及Base16(十六进制)。您可以使用Apache Commons Codec或我最喜欢的Harder Base64 codec。关于java-me - J2ME AES解密错误(org.bouncycaSTLe.crypto.InvalidCipherTextException : pad block corrupted)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4323952/