crspybits

// CommonCrypto is only available with Xcode 10 for import into Swift; see also https://stackoverflow.com/questions/25248598/importing-commoncrypto-in-a-swift-framework
import CommonCrypto

class Hashing {
    // From https://stackoverflow.com/questions/25388747/sha256-in-swift
    private static func sha256(data : Data) -> Data {
        var hash = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
        data.withUnsafeBytes {
            _ = CC_SHA256($0, CC_LONG(data.count), &hash)
        }

crspybits

// CommonCrypto is only available with Xcode 10 for import into Swift; see also https://stackoverflow.com/questions/25248598/importing-commoncrypto-in-a-swift-framework
import CommonCrypto

class Hashing {
    // From https://stackoverflow.com/questions/25388747/sha256-in-swift
    private static func sha256(data : Data) -> Data {
        var hash = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
        data.withUnsafeBytes {
            _ = CC_SHA256($0, CC_LONG(data.count), &hash)
        }

crspybits

// CommonCrypto is only available with Xcode 10 for import into Swift; see also https://stackoverflow.com/questions/25248598/importing-commoncrypto-in-a-swift-framework
import CommonCrypto

class Hashing {
    // From https://stackoverflow.com/questions/25388747/sha256-in-swift
    private static func sha256(data : Data) -> Data {
        var hash = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
        data.withUnsafeBytes {
            _ = CC_SHA256($0, CC_LONG(data.count), &hash)
        }

crspybits

    /* Experimenting with creating a signature to make it easier to do the server-side development.
    See https://github.com/cloudinary/cloudinary_java/blob/master/cloudinary-core/src/main/java/com/cloudinary/Cloudinary.java#L129
    and https://support.cloudinary.com/hc/en-us/articles/203817991-How-to-generate-a-Cloudinary-signature-on-my-own-
    */
    
    // The optional timestamp is for testing this method-- this should be a UNIX timestamp with no trailing decimals-- i.e., just an integer number.
    // Don't use "public_id" or "timestamp" as keys in otherParams if you give it.
    func createSignature(publicId: String, apiSecret: String, otherParams: [String: Any]? = nil, timestamp: String? = nil) -> (signature: String, timestamp: String)? {
        // 1) Set up the parameters we're going to use in the signing.
        var params = [String: Any]()