Android、iPhone和Java三个平台一致的加密工具

阅读更多移动开发中遇到的最让人纠结的要属Java、Android和iPhone三个平台加解密不一致的问题。因为手机端后台通常是用JAVA开发的Web Service，Android和iPhone客户端调用同样的Web Service接口，为了数据安全考虑，要对数据进行加密。头疼的问题就来了，很难编写出一套加密程序，在3个平台间加解密的结果一致，总不能为Android和iPhone两个客户端各写一套Web Service接口吧？我相信还会有很多朋友为此困惑，在此分享一套3DES加密程序，能够实现Java、Android和iPhone三个平台加解密一致。

首先是JAVA端的加密工具类，它同样适用于Android端，无需任何修改，即可保证Java与Android端的加解密一致，并且中文不会乱码。

package org.liuyq.des3;import java.security.Key;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESedeKeySpec;import javax.crypto.spec.IvParameterSpec;/** * 3DES加密工具类 */public class Des3 {// 密钥private final static String secretKey = "liuyunqiang@lx100$#365#$";// 向量private final static String iv = "01234567";// 加解密统一使用的编码方式private final static String encoding = "utf-8";/** * 3DES加密 *  * @param plainText 普通文本 * @return * @throws Exception  */public static String encode(String plainText) throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");IvParameterSpec ips = new IvParameterSpec(iv.getBytes());cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);byte[] encryptData = cipher.doFinal(plainText.getBytes(encoding));return Base64.encode(encryptData);}/** * 3DES解密 *  * @param encryptText 加密文本 * @return * @throws Exception */public static String decode(String encryptText) throws Exception {Key deskey = null;DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");deskey = keyfactory.generateSecret(spec);Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");IvParameterSpec ips = new IvParameterSpec(iv.getBytes());cipher.init(Cipher.DECRYPT_MODE, deskey, ips);byte[] decryptData = cipher.doFinal(Base64.decode(encryptText));return new String(decryptData, encoding);}}

上面的加密工具类会使用到Base64这个类，该类的源代码如下：

import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.OutputStream;/** * Base64编码工具类 */public class Base64 {private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();public static String encode(byte[] data) {int start = 0;int len = data.length;StringBuffer buf = new StringBuffer(data.length * 3 / 2);int end = len - 3;int i = start;int n = 0;while (i <= end) {int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff);buf.append(legalChars[(d >> 18) & 63]);buf.append(legalChars[(d >> 12) & 63]);buf.append(legalChars[(d >> 6) & 63]);buf.append(legalChars[d & 63]);i += 3;if (n++ >= 14) {n = 0;buf.append(" ");}}if (i == start + len - 2) {int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8);buf.append(legalChars[(d >> 18) & 63]);buf.append(legalChars[(d >> 12) & 63]);buf.append(legalChars[(d >> 6) & 63]);buf.append("=");} else if (i == start + len - 1) {int d = (((int) data[i]) & 0x0ff) << 16;buf.append(legalChars[(d >> 18) & 63]);buf.append(legalChars[(d >> 12) & 63]);buf.append("==");}return buf.toString();}private static int decode(char c) {if (c >= 'A' && c <= 'Z')return ((int) c) - 65;else if (c >= 'a' && c <= 'z')return ((int) c) - 97 + 26;else if (c >= '0' && c <= '9')return ((int) c) - 48 + 26 + 26;elseswitch (c) {case '+':return 62;case '/':return 63;case '=':return 0;default:throw new RuntimeException("unexpected code: " + c);}}/** * Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned. */public static byte[] decode(String s) {ByteArrayOutputStream bos = new ByteArrayOutputStream();try {decode(s, bos);} catch (IOException e) {throw new RuntimeException();}byte[] decodedBytes = bos.toByteArray();try {bos.close();bos = null;} catch (IOException ex) {System.err.println("Error while decoding BASE64: " + ex.toString());}return decodedBytes;}private static void decode(String s, OutputStream os) throws IOException {int i = 0;int len = s.length();while (true) {while (i < len && s.charAt(i) <= ' ')i++;if (i == len)break;int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3)));os.write((tri >> 16) & 255);if (s.charAt(i + 2) == '=')break;os.write((tri >> 8) & 255);if (s.charAt(i + 3) == '=')break;os.write(tri & 255);i += 4;}}}

接下来是iPhone端的加密程序，当然是用Ojbective-C写的3DES加密程序，源代码如下：

////  DES3Util.h//#import @interface DES3Util : NSObject {}// 加密方法+ (NSString*)encrypt:(NSString*)plainText;// 解密方法+ (NSString*)decrypt:(NSString*)encryptText;@end

////  DES3Util.m//#import "DES3Util.h"#import #import "GTMBase64.h"#define gkey@"liuyunqiang@lx100$#365#$"#define gIv             @"01234567"@implementation DES3Util// 加密方法+ (NSString*)encrypt:(NSString*)plainText {    NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];size_t plainTextBufferSize = [data length];const void *vplainText = (const void *)[data bytes];        CCCryptorStatus ccStatus;    uint8_t *bufferPtr = NULL;    size_t bufferPtrSize = 0;    size_t movedBytes = 0;        bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);    bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t));    memset((void *)bufferPtr, 0x0, bufferPtrSize);        const void *vkey = (const void *) [gkey UTF8String];    const void *vinitVec = (const void *) [gIv UTF8String];        ccStatus = CCCrypt(kCCEncrypt,                       kCCAlgorithm3DES,                       kCCOptionPKCS7Padding,                       vkey,                       kCCKeySize3DES,                       vinitVec,                       vplainText,                       plainTextBufferSize,                       (void *)bufferPtr,                       bufferPtrSize,                       &movedBytes);        NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];NSString *result = [GTMBase64 stringByEncodingData:myData];    return result;}// 解密方法+ (NSString*)decrypt:(NSString*)encryptText {    NSData *encryptData = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]];size_t plainTextBufferSize = [encryptData length];const void *vplainText = [encryptData bytes];        CCCryptorStatus ccStatus;    uint8_t *bufferPtr = NULL;    size_t bufferPtrSize = 0;    size_t movedBytes = 0;        bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);    bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t));    memset((void *)bufferPtr, 0x0, bufferPtrSize);        const void *vkey = (const void *) [gkey UTF8String];    const void *vinitVec = (const void *) [gIv UTF8String];        ccStatus = CCCrypt(kCCDecrypt,                       kCCAlgorithm3DES,                       kCCOptionPKCS7Padding,                       vkey,                       kCCKeySize3DES,                       vinitVec,                       vplainText,                       plainTextBufferSize,                       (void *)bufferPtr,                       bufferPtrSize,                       &movedBytes);        NSString *result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding] autorelease];    return result;}@end

iPhone端的加密工具类中引入了“GTMBase64.h”，这是iOS平台的Base64编码工具类，就不在这里贴出相关代码了，需要的百度一下就能找到。

这样，JAVA，Android和iPhone三个平台的加密不一致问题就可以解决了。其实，对此问题，还有一种更好的实现方式，那就是用C语言写一套加密程序，这样在iOS平台是可以直接使用C程序的，而在Java和Android端通过JNI去调用C语言编写的加密方法，这样也可以实现3个平台调用同一套加密程序。

借鉴地址： http://blog.csdn.net/lyq8479/article/details/8062867

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