key
User specified key id (optional). If specified, it will become the final component of the key resource name. The id must be unique within the project, must conform with RFC-1034, is restricted to lower-cased letters, and has a maximum length of 63 characters. In another word, the id must match the regular expression: [a-z]([a-z0-9-]{0,61}[a-z0-9])?. The id must NOT be a UUID-like string.