encryptAndReturnParameters

encr.swift

func encryptAndReturnParameters(parameters: [String : AnyObject]) -> [String: AnyObject] {
        
        var sortedKeys = parameters.sorted{$0.0 < $1.0}
        var paramString = ""
    
        for (_, value) in sortedKeys {
            paramString.addString(str: String(describing: value))
        }
        
        paramString.addString(str: "YOURSECRETKEY")
        
        let encr = paramString.sha256() //CryptoSwift
        sortedKeys.append((key: "encr", value: "\(encr)" as AnyObject ))
        
        var newParams = [String: AnyObject]()
        
        for (key, value) in sortedKeys  {
            newParams[key] = value
        }
        
        return newParams
    }