How to use CC_MD5 method in swift language

Question

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 );
m         


        

Answer 1

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.

Answer 2

Here are some changes I had to make to this code to get it working in Swift 5:

    func md5(inString: String) -> String! {
    let str = inString.cString(using: String.Encoding.utf8)
    let strLen = CUnsignedInt(inString.lengthOfBytes(using: String.Encoding.utf8))
    let digestLen = Int(CC_MD5_DIGEST_LENGTH)
    let result = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLen)
    CC_MD5(str!, strLen, result)
    var hash = NSMutableString()
    for i in 0..<digestLen {
        hash.appendFormat("%02x", result[i])
    }
    result.deallocate()
    return String(format: hash as String)
}

Answer 3

Xcode 6 beta 5 now uses an UnsafeMutablePointer in place of an UnsafePointer. String conversion also requires the format: argument label.

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)
    }
}