Android开发实践(六)字符串实现DES加密
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老板说要把请求的url信息加密一下,轻轻的一句话,就使得我写下了这篇文章
这里要说明一下,正常的逻辑应该是在app端加密,在服务器端解密,但是这里只贴了app端的加解密,服务器端的加解密就期待我下一篇文章了。。
网上有很多加密的方式和实现代码,但是对于新手的我来说,却研究了不少时间,特别是不熟悉android的调试,出现了一些问题就常常吓出一身冷汗,闲话不说了,上代码
import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec; public class DESEncrypt { public static String keyStr="CTYSoft0"; private String ivStr="CTYSoft0"; /// <summary> /// 加密 /// </summary> /// <param name="EncStr">被加密的字符串</param> /// <returns>加密后的字符串</returns> public static String EncyptStr(String EncStr) throws Exception { DESEncrypt m = new DESEncrypt(); return m.Encrypt(EncStr,keyStr); } /// <summary> /// 解密 /// </summary> /// <param name="EncStr">被加密的字符串</param> /// <returns>加密后的字符串</returns> public static String Decrypt(String DncStr) throws Exception { DESEncrypt m = new DESEncrypt(); return m.Decrypt(DncStr,keyStr); } //java的DES加密 public static String Encrypt(String message, String key) throws Exception { DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); //根据设定的key生成钥匙 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //创建一个密匙工厂,然后用它把key转换成密钥DESKeySpec SecretKey secretKey = keyFactory.generateSecret(desKeySpec); // SecureRandom random = new SecureRandom(); IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv); // cipher.init(Cipher.ENCRYPT_MODE, secretKey, random); return toHexString(cipher.doFinal(message.getBytes("UTF-8"))); } public static String toHexString(byte b[]) { StringBuffer hexString = new StringBuffer(); for (int i = 0; i < b.length; i++) { String plainText = Integer.toHexString(0xff & b[i]); if (plainText.length() < 2) plainText = "0" + plainText; hexString.append(plainText); } return hexString.toString(); } public static String Decrypt(String message, String key) throws Exception { byte[] bytesrc = convertHexString(message); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey secretKey = keyFactory.generateSecret(desKeySpec); IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); cipher.init(Cipher.DECRYPT_MODE, secretKey, iv); byte[] retByte = cipher.doFinal(bytesrc); return new String(retByte); } public static byte[] convertHexString(String ss) { byte digest[] = new byte[ss.length() / 2]; for (int i = 0; i < digest.length; i++) { String byteString = ss.substring(2 * i, 2 * i + 2); int byteValue = Integer.parseInt(byteString, 16); digest[i] = (byte) byteValue; } return digest; }测试:
//加密字符串 DESEncrypt DESEncryptObj=new DESEncrypt(); String afterStrKey= DESEncryptObj.EncyptStr(KeyStr); String DecryptStr=DESEncryptObj.Decrypt(afterStrKey); //解密可用
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