비밀 키를 문자열로 저장합니다.

Question

암호화 된 문자열을 나중에 암호 해독 할 수 있도록 XML 파일에 키를 저장하려고하는데이 소프트웨어는 암호화하여 "Encrypt()"메소드에서 나를 반환하지만 오류를 반환합니다. 은 "해독()"방법을

코드

private static Cipher ecipher; 
private static Cipher dcipher; 

public static String[] encrypt(String str) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException { 
    String Key, res; 
    SecretKey key; 
    String[] Return = new String[2]; 

    key = KeyGenerator.getInstance("DES").generateKey(); 
    ecipher = Cipher.getInstance("DES"); 
    ecipher.init(Cipher.ENCRYPT_MODE, key); 
    byte[] utf8 = str.getBytes("UTF8"); 
    byte[] enc = ecipher.doFinal(utf8); 

    enc = BASE64EncoderStream.encode(enc); 
    res = new String(enc); 

    //Returning values 0 = Encrypted String 1 = Key For Storage in XML 
    Return[0] = res; 
    byte[] keyBytes = key.getEncoded(); 
    Key = new String(keyBytes,"UTF8"); 
    Return[1] = Key; 

    return Return; 
} 

public static String decrypt(String str, String Key) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, UnsupportedEncodingException, BadPaddingException { 
    SecretKey key = new SecretKeySpec(Key.getBytes("UTF8"), "DES"); 
    dcipher = Cipher.getInstance("DES"); 
    dcipher.init(Cipher.DECRYPT_MODE, key); 
    byte[] dec = BASE64DecoderStream.decode(str.getBytes()); 
    byte[] utf8 = dcipher.doFinal(dec); 
    return new String(utf8, "UTF8"); 
} 

콘솔 반환 사용하려고 할 때 :

run: 
Encryped String : EB6uhzsBl08= 
Key : �g�uX8p 
Sep 07, 2014 6:35:17 PM Software.Software main 
SEVERE: null 
java.security.InvalidKeyException: Invalid key length: 12 bytes 
    at com.sun.crypto.provider.DESCipher.engineGetKeySize(DESCipher.java:373) 
    at javax.crypto.Cipher.passCryptoPermCheck(Cipher.java:1062) 
    at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1020) 
    at javax.crypto.Cipher.implInit(Cipher.java:796) 
    at javax.crypto.Cipher.chooseProvider(Cipher.java:859) 
    at javax.crypto.Cipher.init(Cipher.java:1229) 
    at javax.crypto.Cipher.init(Cipher.java:1166) 
    at Software.Encryption.decrypt(Encryption.java:51) 
    at Software.Software.main(main.java:30) 

BUILD SUCCESSFUL (total time: 1 second) 

Answer 1

을 당신은 base64로

,617의 키를 인코딩해야

public static String[] encrypt(String str) throws NoSuchAlgorithmException, 
     NoSuchPaddingException, InvalidKeyException, 
     UnsupportedEncodingException, IllegalBlockSizeException, 
     BadPaddingException { 
    String Key, res; 
    SecretKey key; 
    String[] Return = new String[2]; 

    key = KeyGenerator.getInstance("DES").generateKey(); 
    ecipher = Cipher.getInstance("DES"); 
    ecipher.init(Cipher.ENCRYPT_MODE, key); 
    byte[] utf8 = str.getBytes("UTF8"); 
    byte[] enc = ecipher.doFinal(utf8); 

    enc = BASE64EncoderStream.encode(enc); 
    res = new String(enc); 

    // Returning values 0 = Encrypted String 1 = Key For Storage in XML 
    Return[0] = res; 
    byte[] keyBytes = key.getEncoded(); 
    Key = new String(BASE64EncoderStream.encode(keyBytes), "UTF8"); 
    Return[1] = Key; 

    return Return; 
} 

public static String decrypt(String str, String Key) 
     throws NoSuchAlgorithmException, NoSuchPaddingException, 
     InvalidKeyException, IllegalBlockSizeException, 
     UnsupportedEncodingException, BadPaddingException { 
    SecretKey key = new SecretKeySpec(BASE64DecoderStream.decode(Key.getBytes("UTF8")), "DES"); 
    dcipher = Cipher.getInstance("DES"); 
    dcipher.init(Cipher.DECRYPT_MODE, key); 
    byte[] dec = BASE64DecoderStream.decode(str.getBytes()); 
    byte[] utf8 = dcipher.doFinal(dec); 
    return new String(utf8, "UTF8"); 
}