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  *  * @author liufeng  * @date 2012-10-11  */ 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  *  * @author liufeng  * @date 2012-10-11  */ 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;  }  } } 

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 // lx100-gz // // Created by 柳峰 on 12-10-10. // Copyright 2012 http://blog.csdn.net/lyq8479. All rights reserved. //  #import    @interface DES3Util : NSObject {  }  // 加密方法 + (NSString*)encrypt:(NSString*)plainText;  // 解密方法 + (NSString*)decrypt:(NSString*)encryptText;  @end // // DES3Util.m // lx100-gz // // Created by 柳峰 on 12-9-17. // Copyright 2012 http://blog.csdn.net/lyq8479. All rights reserved. //  #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http://lib.csdn.net/base/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，实在找不到就回复留言给我。

好了，赶紧试一下吧，JAVA，Android和iPhone三个平台的加密不一致问题是不是解决了呢？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，这是不是就实现了3个平台调用同一套加密程序呢？