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[crypto] Add X25519 key exchange algorithm

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Add an implementation of the X25519 key exchange algorithm as defined
in RFC7748.

This implementation is inspired by and partially based upon the paper
"Implementing Curve25519/X25519: A Tutorial on Elliptic Curve
Cryptography" by Martin Kleppmann, available for download from
https://www.cl.cam.ac.uk/teaching/2122/Crypto/curve25519.pdf

The underlying modular addition, subtraction, and multiplication
operations are completely redesigned for substantially improved
efficiency compared to the TweetNaCl implementation studied in that
paper (approximately 5x-10x faster and with 70% less memory usage).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-01-19 12:36:11 +00:00
parent 908174ec7e
commit 2eea04c02c
4 changed files with 1471 additions and 0 deletions
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src/tests/tests.c
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@@ -81,3 +81,4 @@ REQUIRE_OBJECT ( hmac_test );
REQUIRE_OBJECT ( dhe_test );
REQUIRE_OBJECT ( gcm_test );
REQUIRE_OBJECT ( nap_test );
REQUIRE_OBJECT ( x25519_test );