CODEWITHSUNDEEP
swiftmacosswift2
user691369
user691369

Reputation:

Q: Getting a File's MD5 Checksum in Swift

Let's say I want to get the checksum for bash located in the /bin directory of OSX using Swift 2.x. For my version of OSX, the MD5 is

 5d7583d80e5314ac844eedc6d68c6cd7

I calculated it using md5 bash. I also verified it using an online tool.

I decided to use CommonCrypto since it looks like it may have a speed advantage over other options at this time. When I run my code I get a different result:

bash: d574d4bb40c84861791a694a999cce69

Any help would be appreciated. The contents of both the bridging-header and AppDelegate are below.

md5-Bridging-Header.h 

#import <CommonCrypto/CommonCrypto.h>

AppDelegate.swift

import Cocoa

extension String {
    func md5() -> String! {
        let str = self.cStringUsingEncoding(NSUTF8StringEncoding)
        let strLen = CUnsignedInt(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
        let digestLen = Int(CC_MD5_DIGEST_LENGTH)
        let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)

        CC_MD5(str!, strLen, result)

        let hash = NSMutableString()
        for i in 0..<digestLen {
            hash.appendFormat("%02x", result[i])
        }

        result.destroy()

        return String(format: hash as String)
    }
}



@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var window: NSWindow!


    func applicationDidFinishLaunching(aNotification: NSNotification) {
        // Insert code here to initialize your application
        let fm = NSFileManager.defaultManager()
        let path = "/bin"
        let items = try! fm.contentsOfDirectoryAtPath(path)
        for item in items {
            print("\(item): " + item.md5())
        }
    }

}

Upvotes: 3

Views: 2186

Answers (1)

Jan
Jan

Reputation: 2070

I think your program calculates the MD5 of the String "bash", but not of content of the file named bash.

Upvotes: 2

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