Name: key-renewal-permission
Type: request
Purpose: >
  Deposit a credential enabling a participant to submit a new public key
Response: participant-update-confirmation
Inherits: message
Elements:
  Signature: { required: true }
  From: { required: true }
  Date: { required: true }
  Participant-Id: { required: true, type: identity }
  Credential: { required: true, type: string, min_length: 3, max_length: 96 }
Notes: >
  The Credential element must contain the SHA256 hash of the original
  credential which will be used for key submission.
Rejection-Codes:
  31: Sender is not authorized to permit key submissions
  41: Unknown participant