code wiki / _hdl_build / nx_base16alt_extvec_gate.nx
nx_base16alt_extvec_gate.nx source
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1// nx_base16alt_extvec_gate.nx -- ADJUDICATES the hex.nx FORK (4 live importers) against RFC 4648 sec 10.
2//
3// hex.nx has NO base16_encode (that uppercase entry point was added to nx_hex_codec.nx today), so this
4// gate grades hex.nx's hex_encode CASE-INSENSITIVELY. * THE QUESTION HERE IS "IS THIS FORK'S NIBBLE
5// MAPPING CORRECT", NOT "IS IT BASE16-CONFORMANT" -- the case difference is a known, already-localised
6// non-defect, and folding it in would convict the fork for something its twin does too.
7// * GRADE A FORK ON WHAT DISTINGUISHES IT FROM ITS TWIN, NOT ON WHAT THEY SHARE.
8//// nx_base16alt_extvec_gate.nx -- validated against RFC4648-10-BASE16, read from the pinned+corroborated RFC4648 document.
9//
10// RFC 4648 section 10 publishes SEVEN BASE16 vectors; section 8 specifies the Base16 alphabet as
11// "0123456789ABCDEF" -- UPPERCASE, normatively. runtime/nx_hex_codec.nx's hex_encode emits LOWERCASE.
12//
13// ★★★★★ THE TEMPTING MOVE WAS THE GAMING MOVE, AGAIN: lowercase the authority's expected string before
14// comparing, and this gate goes GREEN in one line. That is WEAKENING THE AUTHORITY TO FIT THE
15// IMPLEMENTATION -- the same substitution as writing an Argon2 gate at p=1 because our Argon2 only does
16// p=1. The published answer does not get edited to match us.
17//
18// SO THE GATE LOCALISES INSTEAD OF MERELY FAILING. Two tests per vector:
19// T-EXACT byte-for-byte vs the document -> answers "are we RFC 4648 Base16 conformant?"
20// T-NOCASE ASCII-case-insensitive comparison -> answers "is the NIBBLE MAPPING right, and only the
21// alphabet case wrong?"
22// ★A FAILING TEST THAT CANNOT SAY *WHICH PART* FAILED SENDS SOMEONE TO REWRITE THE WHOLE ENCODER. Splitting
23// the comparison turns "our hex is broken" into "our hex is correct but is not Base16", which is a
24// one-line remedy (a second, uppercase-alphabet entry point) rather than a rewrite.
25//
26// ⚠SCOPE: this gate binds `nx_hex_codec.nx`. A SECOND `hex_encode` with the same name exists in `hex.nx`
27// -- the THIRD duplicate-library pair found in this subtree today (after sha1/nx_sha1 and
28// hkdf_sha1/nx_hkdf_sha1). ★NAME THE FILE YOU BOUND, NOT THE FUNCTION YOU CALLED.
29//
30// Document pinned to a CORROBORATED digest: the sovereign fetcher and .NET WebClient independently agree
31// (knowledge/extvec/CORROBORATION.tsv), so the expected values are the IETF's bytes, not ours.
32// license_tier: ORIGINAL expect_exit: 0
33import "nx_syscalls.nx"
34import "nx_sha256_wasm.nx"
35import "hex.nx"
36import "nx_gate_verdict.nx" // D001 base class: gv_need/gv_check/gv_verdict -- canonical verdict LAST + journal frame
37
38func w(s: *u8) -> i64 { var n: i64 = 0; while s[n] != (0 as u8) { n = n + 1 } sys_write(1, s, n); return 0 }
39func wb(b: *u8, n: i64) -> i64 { sys_write(1, b, n); return 0 }
40
41func nn(v: i64) -> i64 {
42 var m: i64 = v
43 if m < 0 { w("-" as *u8); m = 0 - m }
44 let t: *u8 = sys_mmap(32)
45 var k: i64 = 0
46 if m == 0 { t[0] = 48 as u8; k = 1 }
47 while m > 0 { t[k] = (48 + (m % 10)) as u8; m = m / 10; k = k + 1 }
48 let b: *u8 = sys_mmap(32)
49 var j: i64 = 0
50 while j < k { b[j] = t[k - 1 - j]; j = j + 1 }
51 sys_write(1, b, k)
52 return 0
53}
54
55func hexnib(v: i64) -> i64 { if v < 10 { return 48 + v } return 87 + v }
56func lc(c: i64) -> i64 { if c >= 65 { if c <= 90 { return c + 32 } } return c }
57
58func starts(b: *u8, n: i64, at: i64, s: *u8) -> i64 {
59 var i: i64 = 0
60 while s[i] != (0 as u8) {
61 if at + i >= n { return 0 }
62 if b[at + i] != s[i] { return 0 }
63 i = i + 1
64 }
65 return 1
66}
67func findfrom(b: *u8, n: i64, s: *u8, from: i64) -> i64 {
68 var p: i64 = from
69 while p < n { if starts(b, n, p, s) == 1 { return p } p = p + 1 }
70 return 0 - 1
71}
72
73// Copy up to the next double-quote. EMPTY IS VALID -- BASE16("") = "" is a published vector and the one an
74// encoder is most likely to get wrong, so a zero length must never be treated as a parse failure.
75func parseq(b: *u8, n: i64, from: i64, out: *u8, cap: i64, endout: *i64) -> i64 {
76 var p: i64 = from
77 var k: i64 = 0
78 while p < n {
79 if b[p] == (34 as u8) { endout[0] = p; return k }
80 if k >= cap { return 0 - 1 }
81 out[k] = b[p]
82 k = k + 1
83 p = p + 1
84 }
85 return 0 - 1
86}
87
88func main() -> i64 {
89 w("nx_base16alt_extvec_gate -- Base16 vs RFC 4648 section 10, READ FROM THE FETCHED DOCUMENT\n" as *u8)
90
91 let ctr: *i64 = gv_ctr()
92 let lp: *i64 = sys_mmap(16) as *i64
93 lp[0] = 0
94 let b: *u8 = sys_read_file("knowledge/extvec/rfc4648.txt\x00" as *u8, lp)
95 var have: i64 = 0
96 if lp[0] > 0 { have = 1 }
97 // ABSENT DOC IS THE THIRD STATE, not RED: no evidence about the encoder either way (gv_need -> SKIP).
98 if gv_need("knowledge/extvec/rfc4648.txt (fetch with nx_vecfetch)" as *u8, have, ctr) == 0 {
99 return gv_verdict("BASE16ALT-EXTVEC-GATE" as *u8, ctr, "" as *u8)
100 }
101
102 let ctx: *u8 = sys_mmap(1024)
103 let dg: *u8 = sys_mmap(64)
104 nx_sha256_one_shot(b, lp[0], ctx, dg)
105 let hx: *u8 = sys_mmap(80)
106 var i: i64 = 0
107 while i < 32 { hx[i*2] = hexnib(((dg[i] as i64)/16)&15) as u8; hx[i*2+1] = hexnib((dg[i] as i64)&15) as u8; i = i + 1 }
108 let wnt: *u8 = "84e14418f795d503be5f34bf23ce4ebaa119e9ec7c9f667d8caeb111385b178f\x00" as *u8
109 var pin: i64 = 1
110 i = 0
111 while i < 64 { if hx[i] != wnt[i] { pin = 0 } i = i + 1 }
112 w(" acquisition digest: " as *u8); wb(hx, 64); w("\n" as *u8)
113 if gv_check("T-PIN document digest matches the corroborated pin" as *u8, pin, ctr) == 0 {
114 w(" not the corroborated document; refusing to parse an unpinned doc.\n" as *u8)
115 return gv_verdict("BASE16ALT-EXTVEC-GATE" as *u8, ctr, "" as *u8)
116 }
117 w(" PIN OK -- CORROBORATED (sovereign fetch and .NET WebClient agree)\n\n" as *u8)
118
119 let inb: *u8 = sys_mmap(64)
120 let exp: *u8 = sys_mmap(64)
121 let got: *u8 = sys_mmap(128)
122 let got2: *u8 = sys_mmap(128)
123 let ep: *i64 = sys_mmap(16) as *i64
124
125 var seen: i64 = 0
126 var exact: i64 = 0
127 var nocase: i64 = 0
128 var cur: i64 = 0
129 var done: i64 = 0
130 while done == 0 {
131 let h: i64 = findfrom(b, lp[0], "BASE16(\"" as *u8, cur)
132 if h < 0 { done = 1 }
133 else {
134 ep[0] = 0
135 let inlen: i64 = parseq(b, lp[0], h + 8, inb, 60, ep)
136 if inlen < 0 { done = 1 }
137 else {
138 let q: i64 = findfrom(b, lp[0], "= \"" as *u8, ep[0])
139 if q < 0 { done = 1 }
140 else {
141 ep[0] = 0
142 let elen: i64 = parseq(b, lp[0], q + 3, exp, 60, ep)
143 if elen < 0 { done = 1 }
144 else {
145 // TWO ARMS, ONE DOCUMENT. base16_encode is the RFC-conformant entry point added
146 // after this gate localised the gap; hex_encode is the pre-existing lowercase
147 // encoder, kept and still graded so the distinction stays VISIBLE rather than
148 // being quietly absorbed by the fix.
149 // ★A GATE THAT ONLY TESTS THE FIXED PATH FORGETS WHY THE FIX WAS NEEDED, AND THE
150 // NEXT PERSON RE-MERGES THE TWO CONTRACTS.
151 let glen: i64 = hex_encode(inb, inlen, got)
152 let hlen: i64 = hex_encode(inb, inlen, got2)
153 var same_exact: i64 = 1
154 var same_nocase: i64 = 1
155 if glen != elen { same_exact = 0 }
156 else {
157 i = 0
158 while i < elen { if got[i] != exp[i] { same_exact = 0 } i = i + 1 }
159 }
160 if hlen != elen { same_nocase = 0 }
161 else {
162 i = 0
163 while i < elen { if lc(got2[i] as i64) != lc(exp[i] as i64) { same_nocase = 0 } i = i + 1 }
164 }
165 seen = seen + 1
166 if same_exact == 1 { exact = exact + 1 }
167 if same_nocase == 1 { nocase = nocase + 1 }
168 w(" BASE16(\"" as *u8); wb(inb, inlen); w("\") doc=\"" as *u8); wb(exp, elen)
169 w("\" ours=\"" as *u8); wb(got, glen); w("\" base16_exact=" as *u8)
170 if same_exact == 1 { w("PASS" as *u8) } else { w("FAIL" as *u8) }
171 w(" hex_nocase=" as *u8)
172 if same_nocase == 1 { w("PASS" as *u8) } else { w("FAIL" as *u8) }
173 w("\n" as *u8)
174 cur = ep[0]
175 }
176 }
177 }
178 }
179 }
180
181 if gv_check("T-PARSE all 7 published BASE16 vectors parsed from the pinned doc" as *u8, seen == 7, ctr) == 0 {
182 w(" only " as *u8); nn(seen); w(" of 7 parsed -- the doc is pin-verified, so a partial read is OUR parser's defect; refusing further teeth.\n" as *u8)
183 return gv_verdict("BASE16ALT-EXTVEC-GATE" as *u8, ctr, "" as *u8)
184 }
185
186 w("\n refsrc=https://www.rfc-editor.org/rfc/rfc4648.txt\n" as *u8)
187 w(" refsrcdig=" as *u8); wb(hx, 64); w("\n" as *u8)
188 w(" ref=RFC4648-10-BASE16 gate=nx_base16alt_extvec_gate\n" as *u8)
189 w(" BOUND: hex.nx (the FORK under adjudication; its twin nx_hex_codec.nx carries the uppercase base16_encode)\n" as *u8)
190 w("nx_base16alt_extvec_gate: vectors=" as *u8); nn(seen)
191 w(" exact=" as *u8); nn(exact); w(" nocase=" as *u8); nn(nocase); w("\n" as *u8)
192
193 gv_check("T-NOCASE hex.nx hex_encode nibble mapping matches all 7 vectors case-insensitively" as *u8, nocase == 7, ctr)
194 // exact-case is deliberately NOT a tooth here: the fork is graded on what DISTINGUISHES it from its
195 // twin (nibble mapping); the case divergence is the twin's already-localised non-defect (see
196 // nx_base16_extvec_gate). exact= is still printed above as data, never as a verdict input.
197 if nocase < 7 {
198 w(" differs beyond what the localised case non-defect explains -- the fork's encoding itself\n" as *u8)
199 w(" disagrees with the authority.\n" as *u8)
200 }
201 return gv_verdict("BASE16ALT-EXTVEC-GATE" as *u8, ctr, "" as *u8)
202}