Sesame-iOS/Sesame/SymmetricKey+Extensions.swift

import Foundation
import CryptoKit

extension SymmetricKey {
    
    var data: Data {
        withUnsafeBytes { Data(Array($0)) }
    }
    
    var base64: String {
        data.base64EncodedString()
    }

    var displayString: String {
        data.hexEncoded.uppercased().split(by: 4).joined(separator: " ")
    }
    
    var codeString: String {
        "    {" +
        withUnsafeBytes {
            return Data(Array($0))
        }.map(String.init).joined(separator: ", ") +
        "},"
    }
}

extension SHA256.Digest {

    var hexEncoded: String {
        Data(map { $0 }).hexEncoded
    }
}

extension String {

    func split(by length: Int) -> [String] {
        var startIndex = self.startIndex
        var results = [Substring]()

        while startIndex < self.endIndex {
            let endIndex = self.index(startIndex, offsetBy: length, limitedBy: self.endIndex) ?? self.endIndex
            results.append(self[startIndex..<endIndex])
            startIndex = endIndex
        }

        return results.map { String($0) }
    }
}