test: fix rfc8291-ua-priv test fixture (Group D)

Message

The rfc8291-ua-priv fixture decoded to a 16-byte value, which is the length of an HMAC auth_secret — not a P-256 private scalar. The ECDH primitive correctly rejected the input as wrong-length.

Per RFC 8291 § 5 the UA private key is q1dXpw3UpT5VOmucfv6ih07Aems3njxI-JWgLcM94 (32 bytes). Replaced the fixture; ECDH now succeeds and matches in both directions.

Changed

 test/test-crypto.sgl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Diff

test/test-crypto.sglmodified

@@ -810,7 +810,8 @@

810

;; very high probability of correctness.

811

812

(define (rfc8291-ua-priv)

−813

(base64url-decode "q4yBd6S0FsYXqdvYJgcWGw"))

+813

;; RFC 8291 § 5 — user-agent private scalar (32 bytes).

+814

(base64url-decode "q1dXpw3UpT5VOmu_cf_v6ih07Aems3njxI-JWgLcM94"))

815

816

(define (rfc8291-ua-pub)

817

(base64url-decode