IOS、java支持DES加密
最近在考虑数据加密方面的需求，所以对数据加密简单的看了一下，当然不是看的原理，只是看看怎么能够实现。现在我们需要实现的是移动端和后台（java）数据加解密的配合，开始的时候考虑的使用RSA，因为RSA是非对称加密，更加安全点，但是RSA加密的过程中，ios公钥加密的数据，后台java是能够解密成功，但是后台java私钥加密的东西，前端ios，就没有解密成功，实验了很多方法，最终也没有成功，所以就放弃了，转向了安全性差一点的DES加密。
对于DES、RSA的介绍，自己百度去吧，因为我也说不明白。（上面我没有提Android，因为Android使用的是java，所以应该跟后台一致）
下面废话不多说，直接贴上代码：
IOS，需要引入GTMBase64.h、GTMBase64.m、GTMDefines.h，这个github上面有我，自己搜搜吧，还有<CommonCrypto/CommonCryptor.h>。
[objc] view plaincopy
import "ViewController.h"
import <CommonCrypto/CommonCryptor.h>
import "GTMBase64.h"
@interface ViewController ()
@end
@implementation ViewController
-(void)viewDidLoad {
[super viewDidLoad]; NSString *key = @"这是个key"; NSString *encryptedData = [self encryptUseDES:@"this is a text" key:key]; NSLog(@"加密后的数据是:%@", encryptedData); NSLog(@"解密后的数据是:%@", [self decryptUseDES:encryptedData key:key]); }
-(void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. }
/*字符串加密
*参数
*plainText : 加密明文
*key : 密钥 64位
*/
-(NSString ) encryptUseDES:(NSString )plainText key:(NSString *)key
{
NSString *ciphertext = nil; const charchar *textBytes = [plainText UTF8String]; NSUInteger dataLength = [plainText length]; unsigned char buffer[1024]; memset(buffer, 0, sizeof(char)); Byte iv[] = {1,2,3,4,5,6,7,8}; size_t numBytesEncrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,kCCOptionPKCS7Padding,[key UTF8String], kCCKeySizeDES,iv,textBytes, dataLength,buffer, 1024,&numBytesEncrypted); if (cryptStatus == kCCSuccess) { NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];ciphertext = [[NSString alloc] initWithData:[GTMBase64 encodeData:data] encoding:NSUTF8StringEncoding]; } return ciphertext; }
//解密
-(NSString ) decryptUseDES:(NSString)cipherText key:(NSString*)key
{
NSData* cipherData = [GTMBase64 decodeString:cipherText]; unsigned char buffer[1024]; memset(buffer, 0, sizeof(char)); size_t numBytesDecrypted = 0; Byte iv[] = {1,2,3,4,5,6,7,8}; CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,kCCAlgorithmDES,kCCOptionPKCS7Padding,[key UTF8String],kCCKeySizeDES,iv,[cipherData bytes],[cipherData length],buffer,1024,&numBytesDecrypted); NSString* plainText = nil; if (cryptStatus == kCCSuccess) { NSData* data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted]; plainText = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; } return plainText; }
@end
java 代码：需要自己引入sun.misc.BASE64Decoder.jar
[java] view plaincopy
package com.yue;
import java.io.IOException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import Decoder.BASE64Decoder;
import Decoder.BASE64Encoder;
public class DesUtil {
private final static String DES = "DES"; public static void main(String[] args) throws Exception { String data = "123 456"; String key = "abcdefgh"; System.err.println(encrypt(data, key)); System.err.println(decrypt(encrypt(data, key), key));System.out.println(decrypt("JF5dX/TlOg529KAhh+vywjzIp5Msktmf", key)); } /** Description 根据键值进行加密
@param data
@param key 加密键byte数组
@return
@throws Exception
*/public static String encrypt(String data, String key) throws Exception {byte[] bt = encrypt(data.getBytes(), key.getBytes());
String strs = new BASE64Encoder().encode(bt);
return strs;} /**Description 根据键值进行解密
@param data
@param key 加密键byte数组
@return
@throws IOException
@throws Exception
*/public static String decrypt(String data, String key) throws IOException, Exception {if (data == null)
return null;BASE64Decoder decoder = new BASE64Decoder();
byte[] buf = decoder.decodeBuffer(data);
byte[] bt = decrypt(buf,key.getBytes());
return new String(bt);} /**Description 根据键值进行加密
@param data
@param key 加密键byte数组
@return
@throws Exception
*/private static byte[] encrypt(byte[] data, byte[] key) throws Exception {// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);// 用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);return cipher.doFinal(data);
}/**Description 根据键值进行解密
@param data
@param key 加密键byte数组
@return
@throws Exception
*/private static byte[] decrypt(byte[] data, byte[] key) throws Exception {// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);// 用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);return cipher.doFinal(data);
}}
代码下载地址：http://download.csdn.net/detail/mengxiangyue/8028311