Method ticketKeyFromBytes

common.go:767–774

ticketKeyFromBytes converts from the external representation of a session ticket key to a ticketKey. Externally, session ticket keys are 32 random bytes and this function expands that into sufficient name and key material.

(b [32]byte)

// ticket key to a ticketKey. Externally, session ticket keys are 32 random
// bytes and this function expands that into sufficient name and key material.
func (c *Config) ticketKeyFromBytes(b [32]byte) (key ticketKey) {
	hashed := sha512.Sum512(b[:])
	copy(key.keyName[:], hashed[:ticketKeyNameLen])
	copy(key.aesKey[:], hashed[ticketKeyNameLen:ticketKeyNameLen+16])
	copy(key.hmacKey[:], hashed[ticketKeyNameLen+16:ticketKeyNameLen+32])
	key.created = c.time()
	return key
}

// maxSessionTicketLifetime is the maximum allowed lifetime of a TLS 1.3 session
// ticket, and the lifetime we set for tickets we send.