接下來我們介紹對稱加密算法,最常用的莫過於DES數據加密算法。
DES
DES-Data Encryption Standard,即數據加密算法。是IBM公司於1975年研究成功並公開發表的。DES算法的入口參數有三個:Key、Data、Mode。其中Key為8個字節共64位,是DES算法的工作密鑰;Data也為8個字節64位,是要被加密或被解密的數據;Mode為DES的工作方式,有兩種:加密或解密。
DES算法把64位的明文輸入塊變為64位的密文輸出塊,它所使用的密鑰也是64位。
通過java代碼實現如下:Coder類見 Java加密技術(一)
Java代碼
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
/**
* DES安全編碼組件
*
* <pre>
* 支持 DES、DESede(TripleDES,就是3DES)、AES、Blowfish、RC2、RC4(ARCFOUR)
* DES
key size must be equal to 56
* DESede(TripleDES)
key size must be equal to 112 or 168
* AES
key size must be equal to 128, 192 or 256,but 192 and 256 bits may not be available
* Blowfish
key size must be multiple of 8, and can only range from 32 to 448 (inclusive)
* RC2
key size must be between 40 and 1024 bitS
* RC4(ARCFOUR)
key size must be between 40 and 1024 bitS
* 具體內容 需要關注 JDK Document http://.../docs/technotes/guides/security/SunProviders.html
* </pre>
*
* @author 梁棟
* @version 1.0
* @since 1.0
*/
public abstract class DESCoder extends Coder {
/**
* ALGORITHM 算法 <br>
* 可替換為以下任意一種算法,同時key值的size相應改變。
*
* <pre>
* DES
key size must be equal to 56
* DESede(TripleDES)
key size must be equal to 112 or 168
* AES
key size must be equal to 128, 192 or 256,but 192 and 256 bits may not be available
* Blowfish
key size must be multiple of 8, and can only range from 32 to 448 (inclusive)
* RC2
key size must be between 40 and 1024 bitS
* RC4(ARCFOUR)
key size must be between 40 and 1024 bitS
* </pre>
*
* 在Key toKey(byte[] key)方法中使用下述代碼
* <code>SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);</code> 替換
* <code>
* DESKeySpec dks = new DESKeySpec(key);
* SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
* SecretKey secretKey = keyFactory.generateSecret(dks);
* </code>
*/
public static final String ALGORITHM = "DES";
/**
* 轉換密鑰<br>
*
* @param key
* @return
* @throws Exception
*/
private static Key toKey(byte[] key) throws Exception {
DESKeySpec dks = new DESKeySpec(key);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
SecretKey secretKey = keyFactory.generateSecret(dks);
// 當使用其他對稱加密算法時,如AES、Blowfish等算法時,用下述代碼替換上述三行代碼
// SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);
return secretKey;
}
/**
* 解密
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decrypt(byte[] data, String key) throws Exception {
Key k = toKey(decryptBASE64(key));
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, k);
return cipher.doFinal(data);
}
/**
* 加密
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encrypt(byte[] data, String key) throws Exception {
Key k = toKey(decryptBASE64(key));
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, k);
return cipher.doFinal(data);
}
/**
* 生成密鑰
*
* @return
* @throws Exception
*/
public static String initKey() throws Exception {
return initKey(null);
}
/**
* 生成密鑰
*
* @param seed
* @return
* @throws Exception
*/
public static String initKey(String seed) throws Exception {
SecureRandom secureRandom = null;
if (seed != null) {
secureRandom = new SecureRandom(decryptBASE64(seed));
} else {
secureRandom = new SecureRandom();
}
KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM);
kg.init(secureRandom);
SecretKey secretKey = kg.generateKey();
return encryptBASE64(secretKey.getEncoded());
}
}
延續上一個類的實現,我們通過MD5以及SHA對字符串加密生成密鑰,這是比較常見的密鑰生成方式。
再給出一個測試類:
Java代碼
import static org.junit.Assert.*; import org.junit.Test; /** *//** * * @author by http://www.bt285.cn http://www.5a520.cn * @version 1.0 * @since 1.0 */ public class DESCoderTest { @Test public void test() throws Exception { String inputStr = "DES"; String key = DESCoder.initKey(); System.err.println("原文:\t" + inputStr); System.err.println("密鑰:\t" + key); byte[] inputData = inputStr.getBytes(); inputData = DESCoder.encrypt(inputData, key); System.err.println("加密後:\t" + DESCoder.encryptBASE64(inputData)); byte[] outputData = DESCoder.decrypt(inputData, key); String outputStr = new String(outputData); System.err.println("解密後:\t" + outputStr); assertEquals(inputStr, outputStr); } }
得到的輸出內容如下:
Console代碼
原文:
DES
密鑰:
f3wEtRrV6q0=
加密後:
C6qe9oNIzRY=
解密後:
DES
由控制台得到的輸出,我們能夠比對加密、解密後結果一致。這是一種簡單的加密解密方式,只有一個密鑰。
其實DES有很多同胞兄弟,如DESede(TripleDES)、AES、Blowfish、RC2、RC4(ARCFOUR)。這裡就不過多闡述了,大同小異,只要換掉ALGORITHM換成對應的值,同時做一個代碼替換SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);就可以了,此外就是密鑰長度不同了。
Java代碼
/**
* DES key size must be equal to 56
* DESede(TripleDES) key size must be equal to 112 or 168
* AES key size must be equal to 128, 192 or 256,but 192 and 256 bits may not be available
* Blowfish key size must be multiple of 8, and can only range from 32 to 448 (inclusive)
* RC2 key size must be between 40 and 1024 bitS
* RC4(ARCFOUR) key size must be between 40 and 1024 bitS
**/