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

In Swift 4 You need library CommonCrypto https://forums.developer.apple.com/thread/46477

#import 

And you can create extension with base64

extension String {
    func hmac(key: String) -> String {
        var digest = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
        CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), key, key.count, self, self.count, &digest)
        let data = Data(bytes: digest)
        return data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))
    }
}

Usege:

print("HMAC_SHA256:".hmac(key: "MyKey"))

Result:

6GM2evJeNZYdP3OjPcKmg8TDzILSQAjy4NGhCHnBH5M=