DES加密 version2

import java.security.Key;
import java.util.Date;
import javax.crypto.Cipher;

public class DESEncrypt {

	

	private static Key getKey(byte[] arrBTmp) throws Exception {
		// 創建一個空的8位字節數組（默認值爲0）
		byte[] arrB = new byte[8];

		// 將原始字節數組轉換爲8位
		for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
			arrB[i] = arrBTmp[i];
		}
		// 生成密鑰
		Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");

		return key;
	}

	public static byte[] encrypt(byte[] contentBytes, byte[] keyBytes) {
		byte[] hasEncrypt = null;
		try {
			Cipher cipher = Cipher.getInstance("DES");
			cipher.init(Cipher.ENCRYPT_MODE, getKey(keyBytes));
			hasEncrypt = cipher.doFinal(contentBytes);
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		return hasEncrypt;
	}

	public static byte[] decrypt(byte[] contentBytes, byte[] keyBytes) {

		byte[] hasDecrypt = null;
		try {
			Cipher cipher = Cipher.getInstance("DES");
			cipher.init(Cipher.DECRYPT_MODE, getKey(keyBytes));
			hasDecrypt = cipher.doFinal(contentBytes);
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		return hasDecrypt;
	}
}

Test：

String content = "DES加密";
		String uuid = UUID.randomUUID().toString();
		String a = Base64.encodeBytes(DESEncrypt.encrypt(content.getBytes("UTF-8"),uuid.getBytes("UTF-8")));
		System.out.println("DES Encrypt..." + a);
		//先Base64解碼，再DES解密
		String b = new String(DESEncrypt.decrypt(Base64.decode(a), uuid.getBytes("UTF-8")),"UTF-8");
		System.out.println("DES decrypt..." + b);

Console

DES Encrypt...hqPYNk/ewpBdzaxNm4tqDQ==
DES decrypt...DES加密