本文将带你了解IOS开发入门之iOS 3DES加密  和 java  3DES 解密，希望本文对大家学ios有所帮助

对称加密算法 3des   在iOS 客户端加密算法

首先进入头文件：

#import

#import

#import

-(NSString*)TripleDES:(NSString*)plainText   encryptOrDecrypt:(CCOperation)encryptOrDecrypt{        const void *vplainText;    size_t plainTextBufferSize;        if (encryptOrDecrypt == kCCDecrypt)//解密      {        NSData *EncryptData =   [GTMBase64 decodeData:[plainText   dataUsingEncoding:NSUTF8StringEncoding]];        plainTextBufferSize = [EncryptData   length];        vplainText =   [EncryptData bytes];    }    else //加密    {        NSData* data = [plainText   dataUsingEncoding:NSUTF8StringEncoding];        plainTextBufferSize = [data length];        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);    //   memset((void *) iv, 0x0, (size_t) sizeof(iv));        const void *vkey = (const void   *)[DESKEY UTF8String];    // NSString   *initVec = @"init Vec";      //const void *vinitVec = (const void *) [initVec UTF8String];    //    Byte iv[] = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};    ccStatus = CCCrypt(encryptOrDecrypt,                       kCCAlgorithm3DES,                       kCCOptionPKCS7Padding   | kCCOptionECBMode,                         vkey,                         kCCKeySize3DES,                         nil,                         vplainText,                         plainTextBufferSize,                       (void   *)bufferPtr,                       bufferPtrSize,                       &movedBytes);    //if (ccStatus == kCCSuccess)   NSLog(@"SUCCESS");    /*else   if (ccStatus == kCC ParamError) return @"PARAM ERROR";     else if (ccStatus == kCCBufferTooSmall)   return @"BUFFER TOO SMALL";       else if (ccStatus == kCCMemoryFailure) return @"MEMORY   FAILURE";     else if (ccStatus ==   kCCAlignmentError) return @"ALIGNMENT";     else if (ccStatus == kCCDecodeError)   return @"DECODE ERROR";       else if (ccStatus == kCCUnimplemented) return   @"UNIMPLEMENTED"; */          NSString *result;        if   (encryptOrDecrypt == kCCDecrypt)      {        result = [[[NSString   alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr                                                                  length:(NSUInteger)movedBytes]                                          encoding:NSUTF8StringEncoding]                  autorelease];    }      else    {        NSData *myData = [NSData   dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];        result = [GTMBase64   stringByEncodingData:myData];    }        return result;}

上面还有个DESKEY宏定义是

#define   kChosenDigestLength CC_SHA1_DIGEST_LENGTH #define DESKEY   @"D6D2402F1C98E208FF2E863AA29334BD65AE1932A821502D9E5673CDE3C713ACFE53E2103CD40ED6BEBB101B484CAE83D537806C6CB611AEE86ED2CA8C97BBE95CF8476066D419E8E833376B850172107844D394016715B2E47E0A6EECB3E83A361FA75FA44693F90D38C6F62029FCD8EA395ED868F9D718293E9C0E63194E87"

java客户端 3DES 解密和加密算法

public static String encryptThreeDESECB(String   src,String key) throws Exception{      DESedeKeySpec dks = new   DESedeKeySpec(key.getBytes("UTF-8"));    SecretKeyFactory keyFactory =   SecretKeyFactory.getInstance("DESede");    SecretKey securekey =   keyFactory.generateSecret(dks);          Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");    cipher.init(Cipher.ENCRYPT_MODE,   securekey);    byte[]   b=cipher.doFinal(src.getBytes());          BASE64Encoder encoder = new BASE64Encoder();    return   encoder.encode(b).replaceAll("\r",   "").replaceAll("\n", "");    } //3DESECB解密,key必须是长度大于等于 3*8 = 24 位public   static String decryptThreeDESECB(String src,String key) throws   Exception{    //--通过base64,将字符串转成byte数组    BASE64Decoder decoder = new   BASE64Decoder();    byte[] bytesrc =   decoder.decodeBuffer(src);    //--解密的key    DESedeKeySpec dks = new   DESedeKeySpec(key.getBytes("UTF-8"));    SecretKeyFactory keyFactory =   SecretKeyFactory.getInstance("DESede");    SecretKey securekey =   keyFactory.generateSecret(dks);          //--Chipher对象解密    Cipher cipher =   Cipher.getInstance("DESede/ECB/PKCS5Padding");    cipher.init(Cipher.DECRYPT_MODE,   securekey);    byte[] retByte =   cipher.doFinal(bytesrc);        return   new String(retByte);}

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