# init(privateKey:ciphersuite:info:encapsulatedKey:presharedKey:presharedKeyIdentifier:) Creates a recipient in preshared key (PSK) mode. ``` init(privateKey: SK, ciphersuite: HPKE.Ciphersuite, info: Data, encapsulatedKey: Data, presharedKey psk: SymmetricKey, presharedKeyIdentifier pskID: Data) throws where SK : HPKEDiffieHellmanPrivateKey ``` ## Parameters `privateKey` The recipient’s private key for decrypting the incoming 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. `encapsulatedKey` The encapsulated symmetric key that the sender provides. `psk` A preshared key (PSK) that the sender and the recipient both hold. `pskID` An identifier for the PSK. ## Discussion The `Receiver` decrypts messages in PSK mode using the encapsulated key with the key schedule information (`info` data), in addition to a symmetric encryption key that the sender and recipient both know in advance. > Note: The system throws errors from ``doc://com.apple.CryptoKit/documentation/CryptoKit/HPKE/Errors`` when it encounters them. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)