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

Published Mar 12, 2025

Creates a sender in authentication and preshared key mode.

iOS: 13+
macOS: 10.15+
tvOS: 13+
watchOS: 6+

init<SK>(recipientKey: SK.PublicKey, ciphersuite: Ciphersuite, info: Data, authenticatedBy authenticationKey: SK, presharedKey psk: SymmetricKey, presharedKeyIdentifier pskID: Data) throws where SK : HPKEDiffieHellmanPrivateKey

Mangled symbol

s6Crypto4HPKEO6SenderV12recipientKey11ciphersuite4info15authenticatedBy09presharedE00jE10IdentifierAE06PublicE0Qz_AC11CiphersuiteV20FoundationEssentials4DataVxAA09SymmetricE0VARtKcAA024HPKEDiffieHellmanPrivateE0Rzlufc

What are these?

FNV24 hash: 10HNT

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.
authenticationKey: The sender’s private key for generating the HMAC.
psk: A preshared key (PSK) that the sender and the recipient both hold.
pskID: An identifier for the PSK.

The Sender encrypts messages in authentication and preshared key (auth_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. Messages also include authentication data so that the recipient can verify the authenticity of the sender’s private key.