將字符串轉換爲byte []和byte []轉換爲JAVA中的字符串

我一直試圖使用「DESede」加密對一些數據進行編碼和解碼。編碼進行得很好，但我在解碼時遇到問題。我得到的格式像「[B @ 7764dc81」（只是一個示例值），應該是字節[]格式的編碼數據，但我以字符串的形式得到這個數據（這是一個要求），現在，我想「[B @ 7764dc81」（只是一個示例值）從字符串轉換爲字節[]形式，但不幸的是，它不適合我。將字符串轉換爲byte []和byte []轉換爲JAVA中的字符串

函數String.getBytes（）;一次又一次返回不同的結果，其中調用此方法的String對象是相同的。但是通過方法（Arrays.toString（String.getBytes（）））獲得的數組值返回相同的值，並且這讓我很頭疼。

基本上，我想根據機器的主板序列號和MAC地址對一些值進行編碼，將這兩個鍵連接起來，並生成一個新的密鑰。之後，我想解碼獲得的密鑰，將其拆分回來，並檢查密鑰是否與MAC地址和主板序列號的原始值完全匹配。我在後面的程序中遇到問題。我在「[B @ f56dec29」（只是一個示例值）格式中獲得了兩個分片字符串值，我希望它們是byte []格式，以便我可以將它們傳遞到我的ObjectCrypter.decryptF（）函數中。此外，這個函數引發一個異常，說「密鑰長度必須是8的倍數......」。主要功能在日期可視化方面有很大幫助，正確的人可能會乍一看猜測實際發生的情況。我有兩個文件，和下面的代碼給出： Security.java

public class Security { 

public static void main(String[] args) throws NoSuchAlgorithmException,UnknownHostException, SocketException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, UnsupportedEncodingException 
{ 
    String algorithm = "DESede"; 
    ObjectCrypter obj = null; 
    Key symKey = KeyGenerator.getInstance(algorithm).generateKey(); 
    Cipher c = Cipher.getInstance(algorithm); 
    String serial = getSerialNumber(); 
    String mac = getMacAddress(); 


    serial = getSerialNumber(); 
    mac = getMacAddress(); 
    byte[] encryptionBytes1 = obj.encryptF(serial,symKey,c); 
    System.out.println("Serial: " + serial); 
    System.out.println("Encr: " + encryptionBytes1); 
    System.out.println("Decr: " + obj.decryptF(encryptionBytes1, symKey, c)); 
    byte[] encryptionBytes2 = obj.encryptF(mac,symKey,c); 
    System.out.println("MAC: " + mac); 
    System.out.println("Encr: " + encryptionBytes2); 
    System.out.println("Decr: " + obj.decryptF(encryptionBytes2, symKey, c)); 


    System.out.println("EncryptionBytes: "+encryptionBytes1); 
    System.out.println("Array EncBytes: "+Arrays.toString(encryptionBytes1)); 
    String ts = encryptionBytes1.toString(); 
    System.out.println("TesString: "+ts); 
    System.out.println("TesString ConvBytes: "+ts.getBytes("ISO-8859-1")); 
    System.out.println("TesString ConvBytes2: "+ts.getBytes("ISO-8859-1")); 
    System.out.println("ts array: "+Arrays.toString(ts.getBytes("ISO-8859-1"))); 
    byte[] tsec = ts.getBytes("ISO-8859-1"); 
    System.out.println("tsec array: "+Arrays.toString(tsec)); 
    System.out.println("esTrEncrypt: "+tsec); 
    System.out.println("esTrEncryptBytes1: "+tsec.toString().getBytes("ISO-8859-1")); 
    System.out.println("esTRarray1: "+Arrays.toString(tsec)); 
    System.out.println("esTrEncryptBytes2: "+tsec.toString().getBytes("ISO-8859-1")); 
    System.out.println("esTRarray1: "+Arrays.toString(tsec)); 
    System.out.println("esTrEncryptBytes3: "+tsec.toString().getBytes("ISO-8859-1")); 
    System.out.println("esTRarray1: "+Arrays.toString(tsec)); 
    String decoded = new String(encryptionBytes1, "ISO-8859-1"); 
    System.out.println("Decoded: "+decoded); 
    byte[] encoded = decoded.getBytes("ISO-8859-1"); 
    System.out.println("Encoded: "+encoded); 
    System.out.println("ArrayEncoded: "+Arrays.toString(encoded)); 
    String decrypted = obj.decryptF(encoded, symKey, c); 
    System.out.println("decrypted: "+decrypted); 

    serial = getSerialNumber(); 
    mac = getMacAddress(); 
    byte[] encryptionBytes12 = obj.encryptF(serial,symKey,c); 
    System.out.println("Serial: " + serial); 
    System.out.println("Encr: " + encryptionBytes12); 
    System.out.println("Decr: " + obj.decryptF(encryptionBytes1, symKey, c)); 
    byte[] encryptionBytes22 = obj.encryptF(mac,symKey,c); 
    System.out.println("MAC: " + mac); 
    System.out.println("Encr: " + encryptionBytes22); 
    System.out.println("Decr: " + obj.decryptF(encryptionBytes2, symKey, c)); 
}//end test 
public static String generateData() throws NoSuchAlgorithmException, NoSuchPaddingException, UnknownHostException, SocketException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException 
{ 
    String part1 = null, part2 = null; 
    String algorithm = "DESede"; 
    ObjectCrypter obj = null; 
    Key symKey = KeyGenerator.getInstance(algorithm).generateKey(); 
    Cipher c = Cipher.getInstance(algorithm); 
    String serial = getSerialNumber(); 
    String mac = getMacAddress(); 
    byte[] encryptionBytes = obj.encryptF(serial, symKey, c); 
    part1 = encryptionBytes.toString(); 
    byte[] encryptionBytes2 = obj.encryptF(mac, symKey, c); 
    part2 = encryptionBytes2.toString(); 
    part1 = sliceString(part1); 
    part2 = sliceString(part2); 
    return part1+part2; 
}//end generateData 


public static boolean checkLicense(String license) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnknownHostException, SocketException, UnsupportedEncodingException 
{ 
    String part1 = null, part2 = null; 
    String genSerial = null, genMac = null; 
    if (license.length() == 16) 
    { 
     part1 = "[[email protected]" + license.substring(0, 8); 
     part2 = "[[email protected]" + license.substring(8, license.length()); 
    }//end if 
    else if (license.length() == 15) 
    { 
     part1 = "[[email protected]" + license.substring(0, 7); 
     part2 = "[[email protected]" + license.substring(7, license.length()); 
    }//end if 
    else 
    { 
     return false; 
    }//end else 


    byte[] bpart1 = part1.getBytes("ISO-8859-1"); 
    byte[] bpart2 = part2.getBytes("ISO-8859-1"); 

    System.out.println("bytes: "+bpart1 + "\t" + bpart2); 

    System.out.println("parts: "+part1 + "\t" + part2); 
    String algorithm = "DESede"; 
    ObjectCrypter obj = null; 
    Key symKey = KeyGenerator.getInstance(algorithm).generateKey(); 
    Cipher c = Cipher.getInstance(algorithm); 
    genSerial = sliceString(obj.decryptF(bpart1, symKey, c)); 
    genMac = sliceString(obj.decryptF(bpart2, symKey, c)); 
    System.out.println(genSerial + "\t" + genMac); 
    System.out.println(getSerialNumber() + "\t" + getMacAddress()); 
    if (genSerial == getSerialNumber() && genMac == getMacAddress()) 
    { 
     return true; 
    }//end if 
    else 
    { 
     return false; 
    }//end else 
}//end checkLicense 
public static String sliceString(String arg) 
{ 
    return arg.substring(3); 
}//end sliceString 

public static String getSerialNumber() 
{ 
    String output = ""; 
    try 
    { 
     Process p=Runtime.getRuntime().exec("wmic baseboard get serialnumber"); 
     //p.waitFor(); 
     BufferedReader reader=new BufferedReader(new InputStreamReader(p.getInputStream())); 
     String line = ""; 
     int index = 0; 
     while((line = reader.readLine()) != null) 
     { 
      if (line.length() > 0) 
      { 
       output = line; 
      }//end if 
     }//end while 
    } 
    catch(IOException e1) {} 
    return output; 
}//end extractMBSerialNumber 

public static String getMacAddress() throws UnknownHostException, SocketException 
{ 
    InetAddress ip; 
    ip = InetAddress.getLocalHost(); 

    NetworkInterface network = NetworkInterface.getByInetAddress(ip); 
    byte[] mac = network.getHardwareAddress(); 

    StringBuilder sb = new StringBuilder(); 
    for (int i = 0; i < mac.length; i++) { 
     sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));   
    } 
    return sb.toString(); 
}

}

爲ObjectCrypter.java的代碼是：

public class ObjectCrypter { 
static String algorithm = "DESede"; 

static byte[] encryptF(String input,Key pkey,Cipher c) throws InvalidKeyException, BadPaddingException, 

IllegalBlockSizeException { 

    c.init(Cipher.ENCRYPT_MODE, pkey); 

    byte[] inputBytes = input.getBytes(); 

    return c.doFinal(inputBytes); 
} 

static String decryptF(byte[] encryptionBytes,Key pkey,Cipher c) throws InvalidKeyException, 

BadPaddingException, IllegalBlockSizeException { 

    c.init(Cipher.DECRYPT_MODE, pkey); 

    byte[] decrypt = c.doFinal(encryptionBytes); 

    String decrypted = new String(decrypt); 
    return decrypted; 
}

}

來源

2015-12-20 Syed Ali Hamza

您的文章很長。嘗試更具體。 – Maroun

如果這是爲了實現複製保護，您將面臨艱苦的戰鬥。 –

您的[[email protected]只是toString()的結果byte []。如果你想創建基於字節的字符串，你需要使用String bytes = new String (yourbytearray);

或者更好

new String (yourbytes, Charset.forName ("utf-8"));

你不應該從字面上使用這些字符串你的方式。

「[B @」只是短用於陣列[在地址@地址加字節B的 ...

同樣從字符串轉換爲byte []是：

byte [] bytedata = yourstring.getBytes (Charset.forName ("utf-8"));

來源

2015-12-20 08:44:51 Jan

我怎麼會這麼愚蠢，認爲胡言亂語是一個有效的價值!!？非常感謝，讓我知道基地址表示法。它解決了很多混亂。我需要重做這件事。謝謝！！ –

當您致電toString()在byte[]。你會得到類似[[email protected]的東西。

數組中的實際值不是文本表示的一部分，所以如果您收到[[email protected]，那麼您已經丟失了所有的值。

來源

2015-12-20 08:46:10 Andreas

有沒有解決方案？ –

不要在'byte []''上調用'toString（）'。如果您需要加密字節數組，請不要轉換爲字符串並返回。 – Andreas

不能將字節（二進制）用作字符串。這是一個誤解。

你應該轉換它。幾個禮儀。基數64或十六進制，例如

使用Base64，它給出了這樣的：

import javax.xml.bind.DatatypeConverter ; 

byte[] bt= ... // what you get 

// Conversion B64 
String encodedb64=DatatypeConverter.printBase64Binary(bt); 

// CONVERSION base 64 => byte => String 
// base 64 => byte 
byte [] byteArrayreverse=DatatypeConverter.parseBase64Binary(encodedb64);

來源

2015-12-20 08:51:21

非常感謝。 DatatypeConverter在這裏爲我解決了很多問題。 –

將字符串轉換爲byte []和byte []轉換爲JAVA中的字符串

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