nx_base64alt_extvec_gate.nx

nx_base64alt_extvec_gate.nx -- ADJUDICATES THE base64 DUPLICATE PAIR AGAINST RFC 4648 section 10. Identical to nx_base64_extvec_gate except ONE import: nx_base64_extvec_gate -> nx_base64.nx (7/7 GREEN) nx_base64alt_extvec_gate -> base64.nx (NEVER GRADED, 10 live importers) Both export the same six functions; only the FILE differs. WHY THIS IS NOT PARANOIA: a census of this runtime found 361 X.nx / nx_X.nx pairs. After classifying out 5 byte-identical, 241 orphaned, and 14 shims-that-re-export-their-twin, 101 GENUINE FORKS remain with live importers. TWO of the two forks so far adjudicated against a published authority -- sha1.nx and md5.nx -- were BROKEN, and their closures included HOTP/TOTP/PBKDF2/UUIDv5 and HTTP Digest auth. base64.nx has 10 live importers and a published 7-vector authority sitting already-corroborated on disk, so grading it costs one import line. * AN UNADJUDICATED FORK IS NOT "PROBABLY FINE" -- IT IS AN UNTESTED HYPOTHESIS WITH A 2-FOR-2 PRIOR. // nx_base64alt_extvec_gate.nx -- EIGHTH provably third-party-validated claim, and the first OUTSIDE cryptography: Base64 vs RFC 4648 section 10. ★A FIFTH VECTOR DIALECT. The previous seven gates read hex in four different layouts; RFC 4648 states its vectors as QUOTED ASCII: BASE64("") = "" BASE64("f") = "Zg==" BASE64("foobar") = "Zm9vYmFy" No hex reader touches this. ★The recurring lesson of this session, once more: there is no general parser, only one proven against the section in front of you. Construction unchanged from the other seven: nothing expected appears in this source, the document is pinned to a digest nx_vecfetch computed IN-PROCESS AT THE SOCKET, and every input AND output below is read out of that pinned document at run time. ★THE EMPTY-STRING VECTOR IS KEPT DELIBERATELY. BASE64("") = "" is the case an encoder is most likely to get wrong (a stray pad, a spurious byte) and the one a hand-written test is most likely to omit. The authority published it; we do not get to skip it. license_tier: ORIGINAL expect_exit: 0