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Implement X25519 Diffie-Hellman key exchange (RFC 7748) master

Field arithmetic in GF(2^255 - 19) using 5x51-bit limb representation. Montgomery ladder scalar multiplication on Curve25519. Constant-time implementation with no secret-dependent branches or memory accesses. Passes RFC 7748 §6.1 DH test vectors and §5.2 iterated test vector (1,000 iterations). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author Pierre Le Fevre Co-author Claude Opus 4.6 Committer Tangled Date Commit b455eb13 Parent 4be3d255
+669
2 changed files