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import java.security.SecureRandom;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class GenerateKey
{
  static public void main( String args[] ) throws Exception {
    String keyFilename = "key.data";
    String algorithm = "DES";
    // Éú³ÉÃܳ×
    SecureRandom sr = new SecureRandom();
    KeyGenerator kg = KeyGenerator.getInstance( algorithm );
    kg.init( sr );
    SecretKey key = kg.generateKey();//[-68, -68, -57, -71, 42, -125, 32, 13]
    // °ÑÃܳ×Êý¾Ý±£´æµ½Îļþ
    Util.writeFile( keyFilename, key.getEncoded() );
  }
}
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// DESËã·¨ÒªÇóÓÐÒ»¸ö¿ÉÐÅÈεÄËæ»úÊýÔ´
SecureRandom sr = new SecureRandom();
byte rawKeyData[] = /* ÓÃijÖÖ·½·¨»ñµÃÃܳ×Êý¾Ý */;
// ´ÓԭʼÃܳ×Êý¾Ý´´½¨DESKeySpec¶ÔÏó
DESKeySpec dks = new DESKeySpec( rawKeyData );
// ´´½¨Ò»¸öÃܳ׹¤³§£¬È»ºóÓÃËü°ÑDESKeySpecת»»³É
// Ò»¸öSecretKey¶ÔÏó
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance( "DES" );
SecretKey key = keyFactory.generateSecret( dks );
// Cipher¶ÔÏóʵ¼ÊÍê³É¼ÓÃܲÙ×÷
Cipher cipher = Cipher.getInstance( "DES" );
// ÓÃÃܳ׳õʼ»¯Cipher¶ÔÏó
cipher.init( Cipher.ENCRYPT_MODE, key, sr );
// ÏÖÔÚ£¬»ñÈ¡Êý¾Ý²¢¼ÓÃÜ
byte data[] = /* ÓÃijÖÖ·½·¨»ñÈ¡Êý¾Ý */
// Õýʽ


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