Android、Ios and Java 实现三重Des对称加密

时间：2015-12-22 02:05:51 阅读：295 评论：0 收藏：0 [点我收藏+]

引言

? ? ?如今手机app五彩缤纷，确保手机用户的数据安全是开发人员必须掌握的技巧，下面通过实例介绍DES在android、ios、java平台的使用方法；

DES加密是目前最常用的对称加密方式，性能优于非对称加密（RSA），是手机app请求数据加密的优先选择。

DES简介：

? ? ?DES全称为Data Encryption Standard，即数据加密标准，是一种使用密钥加密的块算法，算法的入口参数有三个:Key、Data、Mode。

? ? ?Key：为7个字节共56位,是DES算法的工作密钥;

? ? ?Data：为8个字节64位,是要被加密或被解密的数据;

? ? ?Mode：为DES的工作方式,有两种:加密或解密。

3DES简介：

? ? ?3DES（或称为Triple DES）是三重数据加密算法（TDEA，Triple Data Encryption Algorithm）块密码的通称。它相当于是对每个数据块应用三次DES加密算法。由于计算机运算能力的增强，原版DES密码的密钥长度变得容易被暴力破解；3DES即是设计用来提供一种相对简单的方法，即通过增加DES的密钥长度来避免类似的攻击，而不是设计一种全新的块密码算法。因此比起最初的DES，3DES更为安全。

加密实例：

? ? ?java版

? ? ?

package?com.v1.linxun.portal.utils;

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?Des3Util {

???????// 密钥长度不得小于24

???????private?final?static?String?secretKey?=?"123456789012345678901234"?;

???????// 向量可有可无终端后台也要约定

???????private?final?static?String?iv?=?"12345678";

???????// 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);

??????}

??????

???????public?static?void?main(String?args[])?throws?Exception{

????????????String?str?=?"你好"?;

????????????System.?out.println(?"----加密前-----："?+?str?);

????????????String?encodeStr?= Des3Util.?encode(?str);

????????????System.?out.println(?"----加密后-----："?+?encodeStr?);

????????????System.?out.println(?"----解密后-----："?+ Des3Util.decode(?encodeStr));

??????}

}

Android版：

package?com.inn.test;

import?java.security.Key;

import?javax.crypto.Cipher;

import?javax.crypto.SecretKeyFactory;

import?javax.crypto.spec.DESedeKeySpec;

import?javax.crypto.spec.IvParameterSpec;

import?android.util.Base64;

/**

?*?Android?3DES加密工具类

?*/

public?class?AndroidDes3Util {

??????

???????// 密钥长度不得小于24

???????private?final?static?String?secretKey?=?"123456789012345678901234"?;

???????// 向量可有可无终端后台也要约定

???????private?final?static?String?iv?=?"12345678"?;

???????// 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.encodeToString(encryptData,Base64.?DEFAULT?);

??????}

???????/**

?????? * 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, Base64.?DEFAULT));

?????????????return?new?String?(decryptData,?encoding);

??????}

}

IOS版：

//
//? DES3EncryptUtil.h
//? DES3加解密工具
//
//? Created by xc on 15/12/18.
//? Copyright ? 2015年 xc. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface DES3EncryptUtil : NSObject

// 加密方法
+ (NSString*)encrypt:(NSString*)plainText;

// 解密方法
+ (NSString*)decrypt:(NSString*)encryptText;

@end

//
//? DES3EncryptUtil.m
//? DES3加解密工具
//? Created by xc on 15/12/18.
//? Copyright ? 2015年 xc. All rights reserved.

#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonCryptor.h>
#import "MyBase64.h"

//秘钥
#define gkey??????????? @"123456789012345678901234"
//向量
#define gIv???????????? @"12345678"

@implementation DES3EncryptUtil : NSObject

// 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 = [MyBase64 base64EncodedStringFrom:myData];
??? return result;
}

// 解密方法
+ (NSString*)decrypt:(NSString*)encryptText {
??? NSData *encryptData = [MyBase64 dataWithBase64EncodedString:encryptText];
??? 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] ;
??? return result;
}

@end

IOS加密工具中会将加密后的密文转化程Base64的字符串，用到了Base64编码工具，如下

//
//? CommonFunc.h
//? PRJ_base64
//
//? Created by wangzhipeng on 12-11-29.
//? Copyright (c) 2012年 com.comsoft. All rights reserved.
//

#import <Foundation/Foundation.h>

#define __BASE64( text )??????? [CommonFunc base64StringFromText:text]
#define __TEXT( base64 )??????? [CommonFunc textFromBase64String:base64]

@interface MyBase64 : NSObject

/******************************************************************************
函数名称 : + (NSString *)base64StringFromText:(NSString *)text
函数描述 : 将文本转换为base64格式字符串
输入参数 : (NSString *)text??? 文本
输出参数 : N/A
返回参数 : (NSString *)??? base64格式字符串
备注信息 :
******************************************************************************/
+ (NSString *)base64StringFromText:(NSString *)text;

/******************************************************************************
函数名称 : + (NSString *)base64StringFromText:(NSString *)text
函数描述 : 将文本转换为base64格式字符串
输入参数 : (NSString *)text??? 文本
输出参数 : N/A
返回参数 : (NSString *)??? base64格式字符串
备注信息 :
******************************************************************************/
+ (NSString *)base64EncodedStringFrom:(NSData *)data;

/******************************************************************************
函数名称 : + (NSString *)textFromBase64String:(NSString *)base64
函数描述 : 将base64格式字符串转换为文本
输入参数 : (NSString *)base64? base64格式字符串
输出参数 : N/A
返回参数 : (NSString *)??? 文本
备注信息 :
******************************************************************************/
+ (NSString *)textFromBase64String:(NSString *)base64;

/******************************************************************************
函数名称 : + (NSString *)textFromBase64String:(NSString *)base64
函数描述 : 将base64格式字符串转换为文本
输入参数 : (NSString *)base64? base64格式字符串
输出参数 : N/A
返回参数 : (NSString *)??? 文本
备注信息 :
******************************************************************************/
+ (NSData *)dataWithBase64EncodedString:(NSString *)string;

@end

//
//? CommonFunc.m
//? PRJ_base64
//
//? Created by wangzhipeng on 12-11-29.
//? Copyright (c) 2012年 com.comsoft. All rights reserved.
//

#import "MyBase64.h"

//引入IOS自带密码库
#import <CommonCrypto/CommonCryptor.h>

//空字符串
#define LocalStr_None?? @""

static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

@implementation MyBase64 : NSObject

+ (NSString *)base64StringFromText:(NSString *)text
{
??? if (text && ![text isEqualToString:LocalStr_None]) {
??????? //取项目的bundleIdentifier作为KEY? 改动了此处
??????? //NSString *key = [[NSBundle mainBundle] bundleIdentifier];
??????? NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];
??????? //IOS 自带DES加密 Begin? 改动了此处
??????? //data = [self DESEncrypt:data WithKey:key];
??????? //IOS 自带DES加密 End
??????? return [self base64EncodedStringFrom:data];
??? }
??? else {
??????? return LocalStr_None;
??? }
}

+ (NSString *)textFromBase64String:(NSString *)base64
{
??? if (base64 && ![base64 isEqualToString:LocalStr_None]) {
??????? //取项目的bundleIdentifier作为KEY?? 改动了此处
??????? //NSString *key = [[NSBundle mainBundle] bundleIdentifier];
??????? NSData *data = [self dataWithBase64EncodedString:base64];
??????? //IOS 自带DES解密 Begin??? 改动了此处
??????? //data = [self DESDecrypt:data WithKey:key];
??????? //IOS 自带DES加密 End
??????? return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
??? }
??? else {
??????? return LocalStr_None;
??? }
}

/******************************************************************************
函数名称 : + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
函数描述 : 文本数据进行DES加密
输入参数 : (NSData *)data
(NSString *)key
输出参数 : N/A
返回参数 : (NSData *)
备注信息 : 此函数不可用于过长文本
******************************************************************************/
+ (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
{
??? char keyPtr[kCCKeySizeAES256+1];
??? bzero(keyPtr, sizeof(keyPtr));
????
??? [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
????
??? NSUInteger dataLength = [data length];
????
??? size_t bufferSize = dataLength + kCCBlockSizeAES128;
??? void *buffer = malloc(bufferSize);
????
??? size_t numBytesEncrypted = 0;
??? CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
????????????????????????????????????????? kCCOptionPKCS7Padding | kCCOptionECBMode,
????????????????????????????????????????? keyPtr, kCCBlockSizeDES,
????????????????????????????????????????? NULL,
????????????????????????????????????????? [data bytes], dataLength,
????????????????????????????????????????? buffer, bufferSize,
????????????????????????????????????????? &numBytesEncrypted);
??? if (cryptStatus == kCCSuccess) {
??????? return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
??? }
????
??? free(buffer);
??? return nil;
}

/******************************************************************************
函数名称 : + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
函数描述 : 文本数据进行DES解密
输入参数 : (NSData *)data
(NSString *)key
输出参数 : N/A
返回参数 : (NSData *)
备注信息 : 此函数不可用于过长文本
******************************************************************************/
+ (NSData *)DESDecrypt:(NSData *)data WithKey:(NSString *)key
{
??? char keyPtr[kCCKeySizeAES256+1];
??? bzero(keyPtr, sizeof(keyPtr));
????
??? [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
????
??? NSUInteger dataLength = [data length];
????
??? size_t bufferSize = dataLength + kCCBlockSizeAES128;
??? void *buffer = malloc(bufferSize);
????
??? size_t numBytesDecrypted = 0;
??? CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,
????????????????????????????????????????? kCCOptionPKCS7Padding | kCCOptionECBMode,
????????????????????????????????????????? keyPtr, kCCBlockSizeDES,
????????????????????????????????????????? NULL,
????????????????????????????????????????? [data bytes], dataLength,
????????????????????????????????????????? buffer, bufferSize,
????????????????????????????????????????? &numBytesDecrypted);
????
??? if (cryptStatus == kCCSuccess) {
??????? return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
??? }
????
??? free(buffer);
??? return nil;
}

/******************************************************************************
函数名称 : + (NSData *)dataWithBase64EncodedString:(NSString *)string
函数描述 : base64格式字符串转换为文本数据
输入参数 : (NSString *)string
输出参数 : N/A
返回参数 : (NSData *)
备注信息 :
******************************************************************************/
+ (NSData *)dataWithBase64EncodedString:(NSString *)string
{
??? if (string == nil)
??????? [NSException raise:NSInvalidArgumentException format:nil];
??? if ([string length] == 0)
??????? return [NSData data];
????
??? static char *decodingTable = NULL;
??? if (decodingTable == NULL)
??? {
??????? decodingTable = malloc(256);
??????? if (decodingTable == NULL)
??????????? return nil;
??????? memset(decodingTable, CHAR_MAX, 256);
??????? NSUInteger i;
??????? for (i = 0; i < 64; i++)
??????????? decodingTable[(short)encodingTable[i]] = i;
??? }
????
??? const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];
??? if (characters == NULL)???? //? Not an ASCII string!
??????? return nil;
??? char *bytes = malloc((([string length] + 3) / 4) * 3);
??? if (bytes == NULL)
??????? return nil;
??? NSUInteger length = 0;
????
??? NSUInteger i = 0;
??? while (YES)
??? {
??????? char buffer[4];
??????? short bufferLength;
??????? for (bufferLength = 0; bufferLength < 4; i++)
??????? {
??????????? if (characters[i] == ‘\0‘)
??????????????? break;
??????????? if (isspace(characters[i]) || characters[i] == ‘=‘)
??????????????? continue;
??????????? buffer[bufferLength] = decodingTable[(short)characters[i]];
??????????? if (buffer[bufferLength++] == CHAR_MAX)????? //? Illegal character!
??????????? {
??????????????? free(bytes);
??????????????? return nil;
??????????? }
??????? }
????????
??????? if (bufferLength == 0)
??????????? break;
??????? if (bufferLength == 1)????? //? At least two characters are needed to produce one byte!
??????? {
??????????? free(bytes);
??????????? return nil;
??????? }
????????
??????? //? Decode the characters in the buffer to bytes.
??????? bytes[length++] = (buffer[0] << 2) | (buffer[1] >> 4);
??????? if (bufferLength > 2)
??????????? bytes[length++] = (buffer[1] << 4) | (buffer[2] >> 2);
??????? if (bufferLength > 3)
??????????? bytes[length++] = (buffer[2] << 6) | buffer[3];
??? }
????
??? bytes = realloc(bytes, length);
??? return [NSData dataWithBytesNoCopy:bytes length:length];
}

/******************************************************************************
函数名称 : + (NSString *)base64EncodedStringFrom:(NSData *)data
函数描述 : 文本数据转换为base64格式字符串
输入参数 : (NSData *)data
输出参数 : N/A
返回参数 : (NSString *)
备注信息 :
******************************************************************************/
+ (NSString *)base64EncodedStringFrom:(NSData *)data
{
??? if ([data length] == 0)
??????? return @"";
????
??? char *characters = malloc((([data length] + 2) / 3) * 4);
??? if (characters == NULL)
??????? return nil;
??? NSUInteger length = 0;
????
??? NSUInteger i = 0;
??? while (i < [data length])
??? {
??????? char buffer[3] = {0,0,0};
??????? short bufferLength = 0;
??????? while (bufferLength < 3 && i < [data length])
??????????? buffer[bufferLength++] = ((char *)[data bytes])[i++];
????????
??????? //? Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.
??????? characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];
??????? characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
??????? if (bufferLength > 1)
??????????? characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
??????? else characters[length++] = ‘=‘;
??????? if (bufferLength > 2)
??????????? characters[length++] = encodingTable[buffer[2] & 0x3F];
??????? else characters[length++] = ‘=‘;
??? }
????
??? return [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES];
}

@end

到此为止，三平台的加密已经全部结束，代码可以直接使用。

Android、Ios and Java 实现三重Des对称加密

原文：http://innchina.iteye.com/blog/2265502

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