"""
TREZOR support for ECDSA GPG signatures.

See these links for more details:
 - https://www.gnupg.org/faq/whats-new-in-2.1.html
 - https://tools.ietf.org/html/rfc4880
 - https://tools.ietf.org/html/rfc6637
 - https://tools.ietf.org/html/draft-irtf-cfrg-eddsa-05
"""