Struct SourceJournalistKeyResponse 

pub struct SourceJournalistKeyResponse {
    pub journalist: JournalistPublicView,
    pub nr_signature: Signature<NewsroomOnJournalist>,
}

Server returns journalist long-term keys and ephemeral keys

This is the second part of step 5 in the spec.

Updated for 0.3 spec with new key types:

• ephemeral_dh_pk: MLKEM-768 for message enc PSK (one-time)
• ephemeral_kem_pk: DH-AKEM for message enc (one-time)
• ephemeral_pke_pk: XWING for metadata enc (one-time) TODO: this may be split into 2 responses, one that contains static keys and one that contains one-time keys

Fields

journalist: JournalistPublicView

nr_signature: Signature<NewsroomOnJournalist>