我已经使用了Java AES En / Decryption并使用了不同的cyper模式。即我使用CBC和ECB。由于欧洲央行被认为是弱者,我想和CBC一起去。
我认为加密文本ob cbc和ecb的输出是不同的,但它们是相同的。这怎么可能?
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
import com.instana.backend.common.exception.InstanaException;
public class AESTest {
private static String pwd = "etjrgp9user9fu3984h1&(/&%$§";
public static void main(String[] args) throws Exception {
System.out.println("UNSECURE WITH ECB:");
String ecbEncrypt = encrypt("YOLO", cypher(Cipher.ENCRYPT_MODE, "AES"));
System.out.println("Encrypted: " + ecbEncrypt);
String ebcDecrypt = decrypt(ecbEncrypt, cypher(Cipher.DECRYPT_MODE, "AES"));
System.out.println("Decrypted: " + ebcDecrypt);
System.out.println("=====================================");
System.out.println("SECURE WITH CBC");
String cbcEncrypt = encrypt("YOLO", cypher(Cipher.ENCRYPT_MODE, "AES/CBC/PKCS5Padding"));
System.out.println("Encrypted: " + cbcEncrypt);
String cbcDecrypt = decrypt(cbcEncrypt, cypher(Cipher.DECRYPT_MODE, "AES/CBC/PKCS5Padding"));
System.out.println("Decrypted: " + cbcDecrypt);
System.out.println("=====================================");
System.out.println("Decrypting CBC with ECB");
}
public static String encrypt(String superDuperSecret, Cipher cipher) throws IOException {
try {
byte[] encrypted = cipher.doFinal(superDuperSecret.getBytes("UTF-8"));
return new String(new Hex().encode(encrypted));
} catch (Exception e) {
throw new InstanaException("Encryption of token failed.", e);
}
}
public static String decrypt(String superDuperSecret, Cipher cipher) {
try {
byte[] encrypted1 = new Hex().decode(superDuperSecret.getBytes("UTF-8"));
return new String(cipher.doFinal(encrypted1));
} catch (Exception e) {
throw new InstanaException("Encrypted text could not be decrypted.", e);
}
}
private static Cipher cypher(int mode, String method)
throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException,
InvalidAlgorithmParameterException {
SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec(pwd.toCharArray(), pwd.getBytes(), 128, 128);
SecretKey tmp = skf.generateSecret(spec);
SecretKey key = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance(method);
if(method.contains("CBC")) {
byte[] ivByte = new byte[cipher.getBlockSize()];
IvParameterSpec ivParamsSpec = new IvParameterSpec(ivByte);
cipher.init(mode, key, ivParamsSpec);
}else{
cipher.init(mode, key);
}
return cipher;
}
}
答案 0 :(得分:5)
由于您传递空IV(您从未在ivByte
中放置任何内容),因此无论使用何种模式,对第一个块执行的操作都是相同的。加密较长的有效载荷将导致第二个块在CBC
的情况下被链接到第一个块,并且以下块在ECB / CBC之间会有所不同。
使用CBC模式时应该传递非空IV,因此第一个块将与IV进行xorred,从第一个块开始产生不同的加密值。