Figure out how to fix `crypto/tls`.
Most of the Go crypto isn't constant time. I'm not sure if this matters for the install/version check/update and validation mechanisms, but if there is an easy way to fix this problem, it would be the sensible thing to do.
The status as of today is:
- RSA - Vartime.
- ECC - X25519/P-224/P-256 constant time.
- AES - Vartime unless there is AES-NI.
- GHASH - Vartime unless there is PCLMULQDQ (AES-NI).
- Poly1305/ChaCha20 - Constant time.