of_public_key k converts k to type storage. The result is public_key_size bytes long.

to_public_key s converts s to a public key.

• raises Size_mismatch

  if s is not public_key_size bytes long

of_secret_key k converts k to storage. The result is secret_key_size bytes long.

to_secret_key s converts s to a secret key.

• raises Size_mismatch

  if s is not secret_key_size bytes long

of_channel_key k converts k to storage. The result is channel_key_size bytes long.

to_channel_key s converts s to a channel key.

• raises Size_mismatch

  if s is not channel_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

box sk pk m n encrypts and authenticates a message m using the sender's secret key sk, the receiver's public key pk, and a nonce n.

box_open sk pk c n verifies and decrypts a ciphertext c using the receiver's secret key sk, the sender's public key pk, and a nonce n.

• raises Verification_failure

  if authenticity of message cannot be verified

fast_box ck m n encrypts and authenticates a message m using the channel key ck precomputed from sender's secret key and the receiver's public key, and a nonce n.

fast_box_open ck c n verifies and decrypts a ciphertext c using the channel key ck precomputed from receiver's secret key and the sender's public key, and a nonce n.

• raises Verification_failure

  if authenticity of message cannot be verified