let hmacSize = 256 / 8 // [byte].
let signatureSize = Crypto.rsaKeySize / 8 // [byte].
let keysSize = Crypto.rsaKeySize / 8 // [byte].
let hmacSize = 256 / 8 // [byte].
let signatureSize = Crypto.rsaKeySize / 8 // [byte].
let keysSize = Crypto.rsaKeySize / 8 // [byte].