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  • 三重Des对称加密在Android、Ios 和Java 平台的实现

    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 = "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);
          }
          
           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 = "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.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            @"xiangchao@qq.comrnnchina"
    //向量
    #define gIv             @"01234567"

    @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] == '')
                    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。
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  • 原文地址:https://www.cnblogs.com/oc-bowen/p/5622914.html
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