How to use CC_MD5 method in swift language

in Objective-c, we can hash a string like this:

const char *cStr = [someString UTF8String];
unsigned char result[16];
CC_MD5( cStr, strlen(cStr), result );
md5String = [NSString stringWithFormat:
        @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
        result[0], result[1], result[2], result[3],
        result[4], result[5], result[6], result[7],
        result[8], result[9], result[10], result[11],
        result[12], result[13], result[14], result[15]
        ];

But CC_MD5 doesn't work in Swift. How do we deal with this?

Solution 1:

This is what I came up with. It's an extension to String. Don't forget to add #import <CommonCrypto/CommonCrypto.h> to the ObjC-Swift bridging header that Xcode creates.

extension String  {
    var md5: String! {
        let str = self.cStringUsingEncoding(NSUTF8StringEncoding)
        let strLen = CC_LONG(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.dealloc(digestLen)

        return String(format: hash as String)
    }
 }

Solution 2:

Here's my version in Swift 3.0, I believe it to be safer and faster than the other answers here.

A bridging header with #import <CommonCrypto/CommonCrypto.h> is required.

func MD5(_ string: String) -> String? {
    let length = Int(CC_MD5_DIGEST_LENGTH)
    var digest = [UInt8](repeating: 0, count: length)

    if let d = string.data(using: String.Encoding.utf8) {
        _ = d.withUnsafeBytes { (body: UnsafePointer<UInt8>) in
            CC_MD5(body, CC_LONG(d.count), &digest)
        }
    }

    return (0..<length).reduce("") {
        $0 + String(format: "%02x", digest[$1])
    }
}

Solution 3:

I did pure Swift implementation of MD5 as part of CryptoSwift project.

I could copy code here but it uses extensions that are part of this project so it may be useless for copy&paste usage. However you can take a look there and use it.

Solution 4:

So here is the Solution and I know It will save your time 100%

BridgingHeader - > Used to Expose Objective-c code to a Swift Project

CommonCrypto - > is the file needed to use md5 hash

Since Common Crypto is a Objective-c file, you need to use BridgingHeader to use method needed for hashing

(e.g)

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)
    var hash = NSMutableString()
    for i in 0..<digestLen {
        hash.appendFormat("%02x", result[i])
    }
    result.destroy()
    return String(format: hash as String)
}

}

How to add Common Crypto into a Swift Project??

This link will teach you how (STEP by STEP).

I recommend using Bridging Header

*************Updated Swift 3****************

extension String {
func toMD5()  -> String {

        if let messageData = self.data(using:String.Encoding.utf8) {
            var digestData = Data(count: Int(CC_MD5_DIGEST_LENGTH))

            _ = digestData.withUnsafeMutableBytes {digestBytes in
                messageData.withUnsafeBytes {messageBytes in
                    CC_MD5(messageBytes, CC_LONG((messageData.count)), digestBytes)
                }
            }
            return digestData.hexString()
        }

        return self
    }
}


extension Data {

    func hexString() -> String {
        let string = self.map{ String($0, radix:16) }.joined()
        return string
    }

}

How to use?

let stringConvertedToMD5 = "foo".toMD5()