iOS常用加解密方式

AES128

AES128加密

+ (NSData *)encryptAES128:(NSData *)contentData andkey:(NSData *)gkey {
    
     char keyPtr[kCCKeySizeAES128+1];
     memset(keyPtr,0,sizeof(keyPtr));
     [gkey getBytes:keyPtr length:sizeof(keyPtr)];
     NSData* data = [[NSData alloc]initWithData:contentData];
     NSUInteger dataLength = [data length];
     size_t bufferSize = dataLength +kCCBlockSizeAES128;
     void *buffer =malloc(bufferSize);
     size_t numBytesEncrypted =0;
     CCCryptorStatus cryptStatus =CCCrypt(kCCEncrypt,
                                          kCCAlgorithmAES128,
                                          kCCOptionPKCS7Padding|kCCOptionECBMode,
                                          keyPtr,
                                          kCCBlockSizeAES128,
                                          NULL,
                                          [data bytes],
                                          dataLength,
                                          buffer,
                                          bufferSize,
                                          &numBytesEncrypted);
     if(cryptStatus ==kCCSuccess) {
         NSMutableData*resultData = [NSMutableData dataWithBytes:buffer length:numBytesEncrypted];
         return resultData;
     }
     free(buffer);
     return nil;
}

AES128解密

+ (NSData *)decryptADE128:(NSData *)encryptData andkey:(NSData*)gkey {
     char keyPtr[kCCKeySizeAES128+1];
     memset(keyPtr,0,sizeof(keyPtr));
     [gkey getBytes:keyPtr length:sizeof(keyPtr)];
     NSData *data= [[NSData alloc]initWithData:encryptData];
     NSUInteger dataLength = [data length];
     size_t bufferSize = dataLength +kCCBlockSizeAES128;
     void *buffer =malloc(bufferSize);
     size_t numBytesCrypted =0;
     CCCryptorStatus cryptStatus =CCCrypt(kCCDecrypt,
                                          kCCAlgorithmAES128,
                                          kCCOptionECBMode,
                                          keyPtr,
                                          kCCBlockSizeAES128,
                                          NULL,
                                          [data bytes],
                                          dataLength,
                                          buffer,
                                          bufferSize,
                                          &numBytesCrypted);
     if(cryptStatus ==kCCSuccess) {
         NSMutableData*resultData = [NSMutableData dataWithBytesNoCopy:buffer length:numBytesCrypted];
         return resultData;
     }
     free(buffer);
     return nil;
 }

3DES

3DES加密

/**
 3DES加密
 
 @param contentData 需要加密的内容（NSData）
 @param gkey 加密密钥（NSData）
 @return 加密好的内容（NSData）
 */
+ (NSData*)encrypt3DES:(NSData*)contentData andkey:(NSData*)gkey {
    
    NSData *keydata;
    if(gkey.length < 24) {
        NSMutableData *dddd = [[NSMutableData alloc] initWithData:gkey];
        [dddd appendData:gkey];
        [dddd appendData:gkey];
        keydata = [dddd subdataWithRange:NSMakeRange(0,24)];
        dddd = nil;
    } else {
        keydata = gkey;
    }
    size_t plainTextBufferSize = [contentData length];
    const void *vplainText = (const void*)[contentData 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 *keyvoid = (const void*)[keydata bytes];
    ccStatus = CCCrypt(kCCEncrypt,
                      kCCAlgorithm3DES,//3DES
                      kCCOptionPKCS7Padding|kCCOptionECBMode,//设置模式
                      keyvoid,//解密key
                      kCCKeySize3DES,
                      nil,//偏移量，这里不用，设置为nil;不用的话，必须为nil,不可以为@“”
                      vplainText,
                      plainTextBufferSize,
                      (void*)bufferPtr,
                      bufferPtrSize,
                      &movedBytes);
    NSData *myData = [NSData dataWithBytes:(const void*)bufferPtr length:(NSUInteger)movedBytes];
    return myData;
}

3DES解密

/**
 3DES解密
 
 @param encryptData 需要解密的内容（NSData）
 @param gkey 解密密钥（NSData）
 @return 解密好的内容（NSData）
 */
+ (NSData *)decrypt3DES:(NSData *)encryptData andkey:(NSData*)gkey {
    NSData *keydata;
    if(gkey.length < 24) {
        NSMutableData*dddd = [[NSMutableData alloc]initWithData:gkey];
        [dddd appendData:gkey];
        [dddd appendData:gkey];
        keydata = [dddd subdataWithRange:NSMakeRange(0,24)];
        dddd = nil;
    } else {
        keydata = gkey;
    }
    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*keyvoid = (const void*)[keydata bytes];
    ccStatus =CCCrypt(kCCDecrypt,
                      kCCAlgorithm3DES,
                      kCCOptionPKCS7Padding|kCCOptionECBMode,
                      keyvoid,
                      kCCKeySize3DES,
                      nil,
                      vplainText,
                      plainTextBufferSize,
                      (void*)bufferPtr,
                      bufferPtrSize,
                      &movedBytes);
    NSData *myData = [NSData dataWithBytes:(const void*)bufferPtr length:(NSUInteger)movedBytes];
    return myData;
}

DES

DES加密

//DES加密
+ (NSData*)encryptDES:(NSData*)contentData andkey:(NSData*)keydata  {
    
    size_t plainTextBufferSize = [contentData length];
    const void *vplainText = (const void *)[contentData 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 *keyvoid = (const void*)[keydata bytes];
    ccStatus = CCCrypt(kCCEncrypt,
                       kCCAlgorithmDES,
                       kCCOptionPKCS7Padding|kCCOptionECBMode,//设置模式
                       keyvoid,
                       kCCKeySizeDES,
                       nil,
                       vplainText,
                       plainTextBufferSize,
                       (void *)bufferPtr,
                       bufferPtrSize,
                       &movedBytes);
    
    NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];
    return myData;
}

DES解密

//DES解密
+ (NSData *)decryptDES:(NSData *)encryptData andkey:(NSData*)gkey {
    
    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 bytes];
    
    ccStatus = CCCrypt(kCCDecrypt,
                       kCCAlgorithmDES,
                       kCCOptionPKCS7Padding|kCCOptionECBMode,//设置模式
                       vkey,
                       kCCKeySizeDES,
                       nil,
                       vplainText,
                       plainTextBufferSize,
                       (void *)bufferPtr,
                       bufferPtrSize,
                       &movedBytes);
    
    NSData *myData = [NSData dataWithBytes:(const void*)bufferPtr length:(NSUInteger)movedBytes];
    return myData;
}