HMAC Using SHA1 with Secret Key (Works for other HMAC algorithms) for CryptoKit

Hashes.swift

import Foundation
import CryptoKit

extension String {
    func hmacUsingSHA1(_ secretString: String) -> String {
        let key = SymmetricKey(data: secretString.data(using: .utf8)!)
        let signature = HMAC<Insecure.SHA1>.authenticationCode(for: self.data(using: .utf8)!, using: key)

        return Data(signature).map { String(format: "%02hhx", $0) }.joined()
    }
}

print("my_string_to_hash".hmacUsingSHA1("SECRET_KEY"))