[jrepucci-rh]

Description

Some existing Node.js Crypto rules needed analogues for the ECDSA and EdDSA algorithm families. I also needed to add rules for Diffie-Hellman key exchanges.

Claude also caught a gap on existing RSA rules, so figured I'd fix those as well.

AI Generated by: Claude (using Opus 5)

Type of change

• New rule(s)
• New / updated test fixtures
• Bug fix (false positive / false negative)
• Test framework or tooling
• Documentation

Checklist

• New / changed rules have matching test fixtures
• make test passes locally
• Rule files validate with opengrep --validate
• Commits follow Conventional Commits
• No private or internal data is included in this change

Notes for reviewers

Header comments in these files were written by AI and likely inaccurate. View them as notes for the reviewer that may point to blind spots in the patterns. Take them with a grain of salt.

[isasmendiagus]

This looks like the union of #6, #7 and #8 (and #8 has a newer version of the DH rules). Can we close it and continue on the split PRs?

[isasmendiagus]

Closing as agreed, superseded by #6, #7 and #8.