3des在iOS中的加密和解密 | 3des在iOS中的加密和解密

本文介绍了3des在iOS中的加密和解密的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在从事3DES加密和解密。我已经成功完成加密。对于解密，我使用这个代码，但没有得到确切的结果。我的加密字符串为 CHc3TsfJgYs = ，键为分生组织。请告诉我我做错了什么？

  NSString * token = @CHc3TsfJgYs =; 
 NSString * key = @meristem; 
 
 const void * vplainText; 
 size_t plainTextBufferSize; 
 
 plainTextBufferSize = [token length]; 
 vplainText =（const void *）[token UTF8String]; 
 
 CCCryptorStatus ccStatus; 
 uint8_t * bufferPtr = NULL; 
 size_t bufferPtrSize = 0; 
 size_t movedBytes; 
 
 bufferPtrSize =（plainTextBufferSize + kCCBlockSize3DES）& 〜（kCCBlockSize3DES  -  1）; 
 bufferPtr = malloc（bufferPtrSize * sizeof（uint8_t））; 
 memset（（void *）bufferPtr，0x0，bufferPtrSize）; 
 // memset（（void *）iv，0x0，（size_t）sizeof（iv））; 
 
 
 NSString * initVec = @init Vec; 
 const void * vkey =（const void *）[key UTF8String]; 
 const void * vinitVec =（const void *）[initVec UTF8String]; 
 
 ccStatus = CCCrypt（kCCDecrypt，
 kCCAlgorithm3DES，
 kCCOptionPKCS7Padding | kCCOptionECBMode，
 vkey，//123456789012345678901234，//键
 kCCKeySizeDES，
 NULL，// vinitVec，//init Vec，// iv，
 vplainText，//Your Name，// plainText，
 plainTextBufferSize，
（void * ）bufferPtr，
 bufferPtrSize，
& movedBytes）; 
 
 NSString * result; 
 NSData * myData = [NSData dataWithBytes：（const void *）bufferPtr length：（NSUInteger）movedBytes]; 
 result = [myData base64Encoding]; 
 // result = [myDat]; 
 NSLog（@dis is data％@，result）;

解决方案

  ccStatus = CCCrypt（kCCDecrypt，
 kCCAlgorithm3DES，
 kCCOptionPKCS7Padding | kCCOptionECBMode，
 vkey，//123456789012345678901234，// key 
 kCCKeySize3DES，
 NULL，// vinitVec / /init Vec，// iv，
 vplainText，//Your Name，// plainText，
 plainTextBufferSize，
（void *）bufferPtr，
 bufferPtrSize，
& movedBytes）;

您需要更改 kCCKeySizeDES - > kCCKeySize3DES

I am working on 3DES encryption and decryption. I have done encryption successfully. For decryption, I am using this code but not getting exact result. My encryption string is "CHc3TsfJgYs=" and key is "meristem". Please tell me what I am doing wrong?

 NSString *token = @"CHc3TsfJgYs=";
    NSString *key = @"meristem";

    const void *vplainText;
    size_t plainTextBufferSize;

    plainTextBufferSize = [token length];
    vplainText = (const void *) [token UTF8String];

    CCCryptorStatus ccStatus;
    uint8_t *bufferPtr = NULL;
    size_t bufferPtrSize = 0;
    size_t movedBytes ;

    bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);
    bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t));
    memset((void *)bufferPtr, 0x0, bufferPtrSize);
    // memset((void *) iv, 0x0, (size_t) sizeof(iv));


    NSString *initVec = @"init Vec";
    const void *vkey = (const void *) [key UTF8String];
    const void *vinitVec = (const void *) [initVec UTF8String];

    ccStatus = CCCrypt(kCCDecrypt,
                       kCCAlgorithm3DES,
                       kCCOptionPKCS7Padding | kCCOptionECBMode,
                       vkey, //"123456789012345678901234", //key
                       kCCKeySizeDES,
                       NULL,// vinitVec, //"init Vec", //iv,
                       vplainText, //"Your Name", //plainText,
                       plainTextBufferSize,
                       (void *)bufferPtr,
                       bufferPtrSize,
                       &movedBytes);

    NSString *result;
    NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];
    result = [myData base64Encoding];
    // result = [myDat];
    NSLog(@"dis is data %@",result);

解决方案

ccStatus = CCCrypt(kCCDecrypt,
                   kCCAlgorithm3DES,
                   kCCOptionPKCS7Padding | kCCOptionECBMode,
                   vkey, //"123456789012345678901234", //key
                   kCCKeySize3DES,
                   NULL,// vinitVec, //"init Vec", //iv,
                   vplainText, //"Your Name", //plainText,
                   plainTextBufferSize,
                   (void *)bufferPtr,
                   bufferPtrSize,
                   &movedBytes);

you need change kCCKeySizeDES -> kCCKeySize3DES

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