我基本上需要解密从Rijndael加密的服务器检索的密码,我以前从未使用过加密/解密,而且我完全迷失了。我发现在这个网站的某个地方,Java已经实现了一些方法而不需要外部库来实现,但我没有得到它。我唯一需要的是解密,因为无论如何我都不会写回服务器。
有关如何操作或在哪里可以找到有关它的文档的任何想法?
我不知道这个代码是从我要找的答案here中得到的,我不太了解它,正如我所说,我从未使用过这种代码之前的东西:
byte[] sessionKey = null; //Where you get this from is beyond the scope of this post
byte[] iv = null ; //Ditto
byte[] plaintext = null; //Whatever you want to encrypt/decrypt
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
//You can use ENCRYPT_MODE or DECRYPT_MODE
cipher.calling init(Cipher.ENCRYPT_MODE, new SecretKeySpec(sessionKey, "AES"), new IvParameterSpec(iv));
byte[] ciphertext = cipher.doFinal(plaintext);
提前致谢。
答案 0 :(得分:0)
这是一个简单的Crypto实用程序类,可能对您有所帮助。它基于ferenc.hechler编写的代码发布在以下网址: http://www.androidsnippets.com/encryptdecrypt-strings 我已对其进行了一些更改以满足我的需求。
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class SimpleCrypto {
private static final int KEY_SIZE = 128;
public static String encrypt(String seed, String cleartext) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
final byte[] rawKey = getRawKey(seed.getBytes());
final byte[] result = encrypt(rawKey, cleartext.getBytes());
return bin2hex(result);
}
public static String decrypt(String seed, String encrypted) throws NoSuchAlgorithmException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
final byte[] rawKey = getRawKey(seed.getBytes());
final byte[] enc = toByte(encrypted);
final byte[] result = decrypt(rawKey, enc);
return new String(result);
}
public static String decrypt(String seed, byte[] encrypted) throws NoSuchAlgorithmException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
final byte[] rawKey = getRawKey(seed.getBytes());
final byte[] result = decrypt(rawKey, encrypted);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws NoSuchAlgorithmException {
final KeyGenerator kgen = KeyGenerator.getInstance("AES");
final SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(KEY_SIZE, sr); // 192 and 256 bits may not be available
final SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
public static byte[] encrypt(byte[] raw, byte[] clear) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
final SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
final Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
final byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
public static byte[] decrypt(byte[] raw, byte[] encrypted) throws IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
final SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
final Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
final byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return bin2hex(txt.getBytes());
}
public static String fromHex(String hex) {
return new String(toByte(hex));
}
public static byte[] toByte(String hexString) {
final int len = hexString.length() / 2;
final byte[] result = new byte[len];
for (int i = 0; i < len; i++) {
result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
}
return result;
}
public static byte[] getHash(String str) {
MessageDigest digest = null;
try {
digest = MessageDigest.getInstance("SHA-256");
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace();
}
digest.reset();
return digest.digest(str.getBytes());
}
static String bin2hex(byte[] data) {
return String.format("%0" + (data.length * 2) + "X", new BigInteger(1, data));
}
}
以下是如何使用它来解密某些内容:
final String ssid = "MY_WIFI_SSID";
final String encWifiKey = "myEncryptedWifiKeyString";
String wifiKey = "";
try {
wifiKey = new String(SimpleCrypto.decrypt(SimpleCrypto.getHash(ssid), Base64.decode(encWifiKey, Base64.DEFAULT)));
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
}