如何使用DES在iPhone上加密NSString值？ [英] How to encrypt the NSString value using DES in iPhone?

问题描述

  NSString * token = @encryptValue;我使用以下代码来加密NSString值。 
 NSString * key = @encryptKey; 
 
 NSData * keyData = [key dataUsingEncoding：NSUTF8StringEncoding]; 
 NSData * plainData = [token dataUsingEncoding：NSUTF8StringEncoding]; 
 NSMutableData * encData = [NSMutableData dataWithLength：plainData.length + 256]; 
 size_t bytesWritten = 0; 
 CCCryptorStatus ccStatus = CCCrypt（kCCEncrypt，
 kCCAlgorithmDES，
 kCCOptionPKCS7Padding，
 [keyData bytes]，
 kCCKeySizeDES，
 NULL，
 [plainData字节]，
 [plainData length]，
 encData.mutableBytes，
 encData.length，
& bytesWritten）; 
 encData.length = bytesWritten; 
 NSString * encrypted = [[NSString alloc] initWithBytes：[encData bytes] length：[encData length] encoding：NSUTF8StringEncoding]; 
 NSLog（@ENCRYPT：％@，加密）; 
  

但我得到（null）是结果。有什么问题吗？如何加密NSString值？

解决方案

最后我完成了以下代码，现在它的工作正常。

   - （NSString *）doCipher：（NSString *）encryptValue {
 
 const void * vplainText; 
 size_t plainTextBufferSize = [encryptValue length]; 
 vplainText =（const void *）[encryptValue UTF8String]; 
 CCCryptorStatus ccStatus; 
 uint8_t * bufferPtr = NULL; 
 size_t bufferPtrSize = 0; 
 size_t movedBytes = 0; 
 
 bufferPtrSize =（plainTextBufferSize + kCCBlockSizeDES）& 〜（kCCBlockSizeDES  -  1）; 
 bufferPtr = malloc（bufferPtrSize * sizeof（uint8_t））; 
 memset（（void *）bufferPtr，0x0，bufferPtrSize）; 
 
 Byte iv [] = {0x12,0x34,0x56,0x78,0x90,0xab，0xcd，0xef}; 
 
 NSString * key = @encryptKey; 
 const void * vkey =（const void *）[key UTF8String]; 
 
 ccStatus = CCCrypt（kCCEncrypt，
 kCCAlgorithmDES，
 kCCOptionPKCS7Padding，
 vkey，
 kCCKeySizeDES，
 iv，
 vplainText， 
 plainTextBufferSize，
（void *）bufferPtr，
 bufferPtrSize，
& movedBytes）; 
 
 NSData * myData = [NSData dataWithBytes：（const void *）bufferPtr length：（NSUInteger）movedBytes]; 
 NSString * result = [myData base64Encoding]; 
 
返回结果; 
} 
  

I used following code to encrypt the NSString value with Key,

NSString *token = @"encryptValue";
NSString *key = @"encryptKey";

NSData * keyData = [key dataUsingEncoding: NSUTF8StringEncoding];
NSData * plainData = [token dataUsingEncoding: NSUTF8StringEncoding];
NSMutableData * encData = [NSMutableData dataWithLength: plainData.length + 256];
size_t bytesWritten = 0;
CCCryptorStatus ccStatus = CCCrypt (kCCEncrypt,
                    kCCAlgorithmDES,
                    kCCOptionPKCS7Padding,
                    [keyData bytes], 
                    kCCKeySizeDES,
                    NULL,
                    [plainData bytes],
                    [plainData length],
                    encData.mutableBytes,
                    encData.length,
                    &bytesWritten);
encData.length = bytesWritten;    
NSString *encrypted = [[NSString alloc]  initWithBytes:[encData bytes] length:[encData length] encoding: NSUTF8StringEncoding];  
NSLog(@"ENCRYPT : %@",encrypted); 

But I'm getting (null) is the result. Is anything wrong? How to encrypt the NSString value?

解决方案

Finally I done with following code and now its working fine.

- (NSString*) doCipher:(NSString*)encryptValue {

    const void *vplainText;
    size_t plainTextBufferSize = [encryptValue length];
    vplainText = (const void *) [encryptValue UTF8String];    
    CCCryptorStatus ccStatus;
    uint8_t *bufferPtr = NULL;
    size_t bufferPtrSize = 0;
    size_t movedBytes = 0;

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

    Byte iv [] = {0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef};

    NSString *key = @"encryptKey";
    const void *vkey = (const void *) [key UTF8String];

    ccStatus = CCCrypt(kCCEncrypt,
                       kCCAlgorithmDES,
                       kCCOptionPKCS7Padding,
                       vkey, 
                       kCCKeySizeDES,
                       iv,
                       vplainText,
                       plainTextBufferSize,
                       (void *)bufferPtr,
                       bufferPtrSize,
                       &movedBytes);

    NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];
    NSString *result = [myData base64Encoding]; 

   return result;
}

这篇关于如何使用DES在iPhone上加密NSString值？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！