of_key k converts k to storage. The result is key_size bytes long.

to_key s converts s to a secret key.

• raises Size_mismatch

  if s is not key_size bytes long

of_nonce n converts n to storage. The result is nonce_size bytes long.

to_nonce s converts s to a nonce.

• raises Size_mismatch

  if s is not nonce_size bytes long

stream k len n produces a len-byte stream c as a function of a secret key k and a nonce n.

stream_xor k m n encrypts or decrypts a message m using a secret key k and a nonce n.