Support for SSLKEYLOGFILE

[tomato42]

Discussed in #522

^{Originally posted by octaviandumitran June 28, 2024}
Can you add functionality to generate a key log file?
This should be something similar to what Python3.8+ does when SSLKEYLOGFILE is defined.

Alternatively, could you explain how I can generate the file myself?
Presumably, I would need to call keyingMaterialExporter, but I do not know exactly how to serialize that.

[westurner]

• https://github.com/cloudflare/tls-tris/blob/7bb4b4617ebad96fc8c48b0729f9386904e0ae52/common.go#L980-L994
  logLine := []byte(fmt.Sprintf("%s %x %x\n", what, clientRandom, masterSecret))
• https://github.com/segevfiner/sslkeylog/blob/main/sslkeylog.py
• https://github.com/segevfiner/sslkeylog/blob/main/_sslkeylog.c
• https://github.com/wpbrown/openssl-keylog/blob/main/sslkeylog.c

.

• draft-ietf-tls-keylogfile-02: "The SSLKEYLOGFILE Format for TLS"
  https://datatracker.ietf.org/doc/html/draft-ietf-tls-keylogfile-02