init(recipientKey:ciphersuite:info:presharedKey:presharedKeyIdentifier:)

Declaration

init<PK>(recipientKey: PK, ciphersuite: HPKE.Ciphersuite, info: Data, presharedKey psk: SymmetricKey, presharedKeyIdentifier pskID: Data) throws where PK : HPKEDiffieHellmanPublicKey

Parameters

• recipientKey:

  The recipient’s public key for encrypting the messages.

• ciphersuite:

  The cipher suite that defines the cryptographic algorithms to use.

• info:

  Data that the key derivation function uses to compute the symmetric key material. The sender and the recipient need to use the same info data.

• psk:

  A preshared key (PSK) that the sender and the recipient both hold.

• pskID:

  An identifier for the PSK.

Discussion

The Sender encrypts messages in PSK mode using a symmetric encryption key that the sender and recipient both know in advance, in combination with a key it derives using a key derivation function (KDF) and the key schedule data in info. The Sender encapsulates the derived key using the recipient’s public key. You access the encapsulated key using encapsulatedKey.