iOS 获取文件MD5

+ (NSString*)getFileMD5WithPath:(NSString*)path
{
    return (__bridge_transfer NSString *)FileMD5HashCreateWithPath((__bridge CFStringRef)path, FileHashDefaultChunkSizeForReadingData);
}

CFStringRef FileMD5HashCreateWithPath(CFStringRef filePath,size_t chunkSizeForReadingData)
{
    // Declare needed variables
    
    CFStringRef result = NULL;
    
    CFReadStreamRef readStream = NULL;
    
    // Get the file URL
    
    CFURLRef fileURL =
    
    CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
                                  
                                  (CFStringRef)filePath,
                                  
                                  kCFURLPOSIXPathStyle,
                                  
                                  (Boolean)false);
    
    if (!fileURL) goto done;
    
    // Create and open the read stream
    
    readStream = CFReadStreamCreateWithFile(kCFAllocatorDefault,
                                            
                                            (CFURLRef)fileURL);
    
    if (!readStream) goto done;
    
    bool didSucceed = (bool)CFReadStreamOpen(readStream);
    
    if (!didSucceed) goto done;
    
    // Initialize the hash object
    
    CC_MD5_CTX hashObject;
    
    CC_MD5_Init(&hashObject);
    
    // Make sure chunkSizeForReadingData is valid
    
    if (!chunkSizeForReadingData)
    {
        chunkSizeForReadingData = FileHashDefaultChunkSizeForReadingData;
    }
    
    // Feed the data to the hash object
    
    bool hasMoreData = true;
    
    while (hasMoreData)
    {
        uint8_t buffer[chunkSizeForReadingData];
        
        CFIndex readBytesCount = CFReadStreamRead(readStream,(UInt8 *)buffer,(CFIndex)sizeof(buffer));
        
        if (readBytesCount == -1) break;
        
        if (readBytesCount == 0)
        {
            hasMoreData = false;
            continue;
        }
        
        CC_MD5_Update(&hashObject,(const void *)buffer,(CC_LONG)readBytesCount);
    }
    
    // Check if the read operation succeeded
    
    didSucceed = !hasMoreData;
    
    // Compute the hash digest
    
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    
    CC_MD5_Final(digest, &hashObject);
    
    // Abort if the read operation failed
    
    if (!didSucceed) goto done;
    
    // Compute the string result
    
    char hash[2 * sizeof(digest) + 1];
    
    for (size_t i = 0; i < sizeof(digest); ++i)
    {
        snprintf(hash + (2 * i), 3, "%02x", (int)(digest[i]));
    }
    
    result = CFStringCreateWithCString(kCFAllocatorDefault,(const char *)hash,kCFStringEncodingUTF8);
    
done:
    
    if (readStream)
    {
        CFReadStreamClose(readStream);
        CFRelease(readStream);
    }
    
    if (fileURL)
    {
        CFRelease(fileURL);
    }
    
    return result;
    
}