Implementing HMAC and SHA1 encryption in swift

Question

I am relatively new to Swift and i\'m stuck encrypting using HMAC and SHA1. I Found the following answer https://stackoverflow.com/a/24411522/4188344 but i can\'t work out h

Answer 1

Here is how to create a Swift 4 extension:

Bridging headers file

#import 

Code

extension String {

    func hmac(key: String) -> String {
        var digest = [UInt8](repeating: 0, count: Int(CC_SHA1_DIGEST_LENGTH))
        CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA1), key, key.count, self, self.count, &digest)
        let data = Data(bytes: digest)
        return data.map { String(format: "%02hhx", $0) }.joined()
    }

}

Example

let result = "test".hmac(key: "test")

Result

0c94515c15e5095b8a87a50ba0df3bf38ed05fe6