objective-c - 使用 des cbc 模式 obj-c 加密/解密字符串

Question

大家好，我是 obj-c 世界的新手，我想知道如何在 des 中加密字符串？我已经尝试过搜索，但找不到任何可以帮助我的示例代码，我唯一意识到的是有一个类 commonCrypt 可以做我想做的事，但我不知道如何使用它

我的代码

NSString* key = @"abc43HU0";
NSString *token = @"hellohello";


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 = NULL;

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 *) [key UTF8String];

ccStatus = CCCrypt(kCCEncrypt,
                   kCCAlgorithmDES,
                   kCCModeCBC,
                   vkey, //"123456789012345678901234", //key
                   kCCKeySizeDES,
                   vinitVec,// 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;

crypt_result.text = myData;

Answer 1

这是工作代码:

NSString* key = @"abc43HU0";
NSString *token = @"hellohello";

const void *vplainText;
size_t plainTextBufferSize = [token length];
vplainText = (const void *) [token 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 [] = {0x65, 0x110, 0x68, 0x26, 0x69, 0x178, 0x200, 0x219};

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 = [base64 base64EncodeData:myData];//my own method to encoding with base64