学步园

加密和解密要用同一個key

AES：

import java.util.UUID;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class DES {

	private static final byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };

	/**
	 * 
	 * @param encryptString 加密内容
	 * @param encryptKey 加密key
	 * @return
	 * @throws Exception
	 */
	public static String encryptDES(String encryptString, String encryptKey)
			throws Exception {
		IvParameterSpec zeroIv = new IvParameterSpec(iv);
		SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
		String tmp = Base64.encodeBytes(encryptString.getBytes("UTF-8"));
		byte[] encryptedData = cipher.doFinal(tmp.getBytes("UTF-8"));
		return Base64.encodeBytes(encryptedData);
	}
	
	/**
	 * 
	 * @param decryptString 解密内容
	 * @param encryptKey 解密key
	 * @return
	 * @throws Exception
	 */
	public static String decryptDES(String decryptString,String encryptKey)throws Exception {
		IvParameterSpec zeroIv = new IvParameterSpec(iv);
		SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
		byte[] decryptBytes = cipher.doFinal(Base64.decode(decryptString));
		String tmp = new String(decryptBytes,"UTF-8");
		return new String(Base64.decode(tmp));
	}
	
	public static String getKey(){
		String p = UUID.randomUUID().toString();
		return SHA1.Encrypt(p).substring(0, 8);
	}
	
}

Test：

public static void testDES() throws Exception{
	
		String content = "AES加密";
		String key = DES.getKey();
		String a = DES.encryptDES(content, key);
		System.out.println("DES Encrypt..." + a);
		String b = DES.decryptDES(a, key);
		System.out.println("DES decrypt..." + b);
}

Console：

DES Encrypt...93koM7boCXsNrH91Y0MDJA==
DES decrypt...AES加密