Java android DES+Base64加密解密 _android

志不强者智不达，言不信者行不果。这篇文章主要讲述Java android DES+Base64加密解密相关的知识，希望能为你提供帮助。
服务器与客户端加密解密传输，中间遇到各种坑，客户端无论用AES还是DES解密时都会出现错误，后来才看到好多人说要用AES/DES加完密后还要BASE64加密，照做时发现android和java的Base64加密解密不一致，只好不使用java或android的Base64重新在网上找了一个，感谢以下两位提供的代码，两段分别转载自以下博客。
https://www.cnblogs.com/xuhaiqing/archive/2013/03/12/2955837.html
【Java android DES+Base64加密解密】https://www.cnblogs.com/langtianya/p/3715975.html

import java.io.ByteArrayOutputStream; public class Base64Util { private static final char[] base64EncodeChars = new char[] { \'A\', \'B\', \'C\', \'D\', \'E\', \'F\', \'G\', \'H\', \'I\', \'J\', \'K\', \'L\', \'M\', \'N\', \'O\', \'P\', \'Q\', \'R\', \'S\', \'T\', \'U\', \'V\', \'W\', \'X\', \'Y\', \'Z\', \'a\', \'b\', \'c\', \'d\', \'e\', \'f\', \'g\', \'h\', \'i\', \'j\', \'k\', \'l\', \'m\', \'n\', \'o\', \'p\', \'q\', \'r\', \'s\', \'t\', \'u\', \'v\', \'w\', \'x\', \'y\', \'z\', \'0\', \'1\', \'2\', \'3\', \'4\', \'5\', \'6\', \'7\', \'8\', \'9\', \'+\', \'/\' }; private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 }; private Base64Util() { }/** * 将字节数组编码为字符串 * * @param data */ public static String encode(byte[] data) { StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i < len) { b1 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 > > > 2]); sb.append(base64EncodeChars[(b1 & 0x3) < < 4]); sb.append("=="); break; } b2 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 > > > 2]); sb.append(base64EncodeChars[((b1 & 0x03) < < 4) | ((b2 & 0xf0) > > > 4)]); sb.append(base64EncodeChars[(b2 & 0x0f) < < 2]); sb.append("="); break; } b3 = data[i++] & 0xff; sb.append(base64EncodeChars[b1 > > > 2]); sb.append(base64EncodeChars[((b1 & 0x03) < < 4) | ((b2 & 0xf0) > > > 4)]); sb.append(base64EncodeChars[((b2 & 0x0f) < < 2) | ((b3 & 0xc0) > > > 6)]); sb.append(base64EncodeChars[b3 & 0x3f]); } return sb.toString(); }/** * 将base64字符串解码为字节数组 * * @param str */ public static byte[] decode(String str) { byte[] data = https://www.songbingjia.com/android/str.getBytes(); int len = data.length; ByteArrayOutputStream buf = new ByteArrayOutputStream(len); int i = 0; int b1, b2, b3, b4; while (i < len) {/* b1 */ do { b1 = base64DecodeChars[data[i++]]; } while (i < len & & b1 == -1); if (b1 == -1) { break; }/* b2 */ do { b2 = base64DecodeChars[data[i++]]; } while (i < len & & b2 == -1); if (b2 == -1) { break; } buf.write((int) ((b1 < < 2) | ((b2 & 0x30) > > > 4))); /* b3 */ do { b3 = data[i++]; if (b3 == 61) { return buf.toByteArray(); } b3 = base64DecodeChars[b3]; } while (i < len & & b3 == -1); if (b3 == -1) { break; } buf.write((int) (((b2 & 0x0f) < < 4) | ((b3 & 0x3c) > > > 2))); /* b4 */ do { b4 = data[i++]; if (b4 == 61) { return buf.toByteArray(); } b4 = base64DecodeChars[b4]; } while (i < len & & b4 == -1); if (b4 == -1) { break; } buf.write((int) (((b3 & 0x03) < < 6) | b4)); } return buf.toByteArray(); } }

package util; import java.security.SecureRandom; import javax.crypto.spec.DESKeySpec; import javax.crypto.SecretKeyFactory; import javax.crypto.SecretKey; import javax.crypto.Cipher; /** DES加密介绍 DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。DES加密算法出自IBM的研究，后来被美国政府正式采用，之后开始广泛流传，但是近些年使用越来越少，因为DES使用56位密钥，以现代计算能力， 24小时内即可被破解。虽然如此，在某些简单应用中，我们还是可以使用DES加密算法，本文简单讲解DES的JAVA实现。注意：DES加密和解密过程中，密钥长度都必须是8的倍数 */ public class DES { public DES() { } //测试 public static void main(String args[]) { //待加密内容 String str = "测试内容"; //密码，长度要是8的倍数 String password = "9588028820109132570743325311898426347857298773549468758875018579537757772163084478873699447306034466200616411960574122434059469100235892702736860872901247123456"; byte[] result = DES.encrypt(str.getBytes(),password); System.out.println("加密后："+new String(result)); //直接将如上内容解密 try { byte[] decryResult = DES.decrypt(result, password); System.out.println("解密后："+new String(decryResult)); } catch (Exception e1) { e1.printStackTrace(); } } /** * 加密 * @param datasource byte[] * @param password String * @return byte[] */ public staticbyte[] encrypt(byte[] datasource, String password) { try{ SecureRandom random = new SecureRandom(); DESKeySpec desKey = new DESKeySpec(password.getBytes()); //创建一个密匙工厂，然后用它把DESKeySpec转换成 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey securekey = keyFactory.generateSecret(desKey); //Cipher对象实际完成加密操作 Cipher cipher = Cipher.getInstance("DES"); //用密匙初始化Cipher对象 cipher.init(Cipher.ENCRYPT_MODE, securekey, random); //现在，获取数据并加密 //正式执行加密操作 return cipher.doFinal(datasource); }catch(Throwable e){ e.printStackTrace(); } return null; } /** * 解密 * @param src byte[] * @param password String * @return byte[] * @throws Exception */ public static byte[] decrypt(byte[] src, String password) throws Exception { // DES算法要求有一个可信任的随机数源 SecureRandom random = new SecureRandom(); // 创建一个DESKeySpec对象 DESKeySpec desKey = new DESKeySpec(password.getBytes()); // 创建一个密匙工厂 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // 将DESKeySpec对象转换成SecretKey对象 SecretKey securekey = keyFactory.generateSecret(desKey); // Cipher对象实际完成解密操作 Cipher cipher = Cipher.getInstance("DES"); // 用密匙初始化Cipher对象 cipher.init(Cipher.DECRYPT_MODE, securekey, random); // 真正开始解密操作 return cipher.doFinal(src); } }