手机端与服务器加密方式介绍

      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

 

》》》》》》》》》》》》java(android)

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);
        }
}

 

》》》》》》》》》》》》》》》》》工具类Base64源代码》》》》》》

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;
                else
                        switch (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;
                }
        }
}</i></i></i>

 

 

》》》》》》》》》》》》》》iphone端

//
//  DES3Util.h
//
 
#import <Foundation/Foundation.h>
 
 
@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 <CommonCrypto/CommonCryptor.h>
#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所用工具“GTMBase64.h”，是iOS平台的Base64编码工具类