---
title: "init(privateKey:ciphersuite:info:encapsulatedKey:authenticatedBy:)"
framework: cryptokit
role: symbol
role_heading: Initializer
path: "cryptokit/hpke/recipient/init(privatekey:ciphersuite:info:encapsulatedkey:authenticatedby:)"
---

# init(privateKey:ciphersuite:info:encapsulatedKey:authenticatedBy:)

Creates a recipient in authentication mode.

## Declaration

```swift
init<SK>(privateKey: SK, ciphersuite: HPKE.Ciphersuite, info: Data, encapsulatedKey: Data, authenticatedBy authenticationKey: SK.PublicKey) 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.
- `authenticationKey`: The sender’s public key for authenticating the messages.

## Discussion

Discussion The Receiver decrypts messages in authentication mode using the encapsulated key with the key schedule information (info data). Messages also include authentication data so that the recipient can verify the authenticity of the sender’s private key. note: The system throws errors from HPKE.Errors when it encounters them.