Crypto.encryptRSA cryptPubKey (Array.append keyAES <| Array.append keyMAC iv) |> writer.Write
// Plaintext -> cryptoStream -> hmacStream -> cyphertext.
- let (hmacStream, hmac) = Crypto.HMACStream keyMAC outputStream
+ let hmacStream, hmac = Crypto.HMACStream keyMAC outputStream
use cryptoStream = Crypto.encryptAES keyAES iv hmacStream
let cryptoWriter = new BinaryWriter (cryptoStream)
use reader = new BinaryReader (inputStream)
let mac = reader.ReadBytes 32
let signature = reader.ReadBytes 256
- let keys = reader.ReadBytes 256 |> Crypto.decryptRSA decryptPrivKey
+ let keys =
+ try reader.ReadBytes 256 |> Crypto.decryptRSA decryptPrivKey
+ with
+ | :? Security.Cryptography.CryptographicException -> raise UnableToDecryptAESKeys
let keyAES = keys.[0..31]
let keyMAC = keys.[32..63]
let iv = keys.[64..79]
let mac' = Crypto.ComputeHMAC keyMAC inputStream
if mac' <> mac then
raise IntegrityError
-
+
// Authentication validation.
if not <| Crypto.verifySignRSA signaturePubKey mac' signature then
raise SignatureMismatch