nx_chacha20_test.nx

nx_chacha20_test.nx -- RFC 8439 §2.3.2 KAT + round-trip for ChaCha20. Vector (RFC 8439 §2.3.2 worked example): Key: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f Nonce: 00 00 00 09 00 00 00 4a 00 00 00 00 Counter: 1 Output (64-byte keystream block): 10 f1 e7 e4 d1 3b 59 15 50 0f dd 1f a3 20 71 c4 c7 d1 f4 c7 33 c0 68 03 04 22 aa 9a c3 d4 6c 4e d2 82 64 46 07 9f aa 09 14 c2 d7 05 d9 8b 02 a2 b5 12 9c d1 de 16 4e b9 cb d0 83 e8 a2 50 3c 4e Plus a round-trip: encrypt(decrypt(P)) == P since ChaCha20 is XOR with the keystream (self-inverse with same key/counter/nonce). expect_exit: 0 license_tier: ORIGINAL