From ab8ec9fa7c256bb192a9fe1a9cd199d0c8b95979 Mon Sep 17 00:00:00 2001
From: AJ ONeal <coolaj86@gmail.com>
Date: Sun, 18 Nov 2018 14:34:20 -0700
Subject: [PATCH] WIP more asn1

---
 lib/ecdsacsr.js | 107 +++++++++++++++++++++++++-----------------------
 1 file changed, 55 insertions(+), 52 deletions(-)

diff --git a/lib/ecdsacsr.js b/lib/ecdsacsr.js
index 709838e..bd12e0e 100644
--- a/lib/ecdsacsr.js
+++ b/lib/ecdsacsr.js
@@ -26,21 +26,21 @@ function ASN1() {
   }
   return hex + numToHex(len) + str;
 }
-
-function UINT() {
+ASN1.UInt = function UINT() {
   var str = Array.prototype.slice.call(arguments).join('');
   var first = parseInt(str.slice(0, 2), 16);
   // high-order bit means signed, negative
   // we want positive, so we pad with a leading '00'
   if (0x80 & first) { str = '00' + str; }
   return ASN1('02', str);
-}
+};
 
-function BITSTR() {
+ASN1.BitStr = function BITSTR() {
   var str = Array.prototype.slice.call(arguments).join('');
   // '00' is a mask of how many bits of the next byte to ignore
   return ASN1('03', '00' + str);
-}
+};
+
 function SEQ() {
   return ASN1('30', Array.prototype.slice.call(arguments).join(''));
 }
@@ -204,22 +204,27 @@ function csrEcSig(r, s) {
       // (ANSI X9.62 ECDSA algorithm with SHA256)
       OBJID('2A 86 48 CE 3D 04 03 02')
     )
-  , BITSTR(
+  , ASN1.BitStr(
       SEQ(
-        UINT(toHex(r))
-      , UINT(toHex(s))
+        ASN1.UInt(toHex(r))
+      , ASN1.UInt(toHex(s))
       )
     )
   ].join('');
 }
 var csrDomains = '82 {dlen} {domain.tld}';  // 2+n bytes (type 82?)
 
+// TODO utf8
 function strToHex(str) {
-  return str.split('').map(function (ch) {
-    var h = ch.charCodeAt(0).toString(16);
-    if (2 === h.length) {
-      return h;
-    }
+  var escstr = encodeURIComponent(str);
+  // replaces any uri escape sequence, such as %0A,
+  // with binary escape, such as 0x0A
+  var binstr = escstr.replace(/%([0-9A-F]{2})/g, function(match, p1) {
+    return String.fromCharCode('0x' + p1);
+  });
+  return binstr.split('').map(function (b) {
+    var h = b.charCodeAt(0).toString(16);
+    if (2 === h.length) { return h; }
     return '0' + h;
   }).join('');
 }
@@ -249,7 +254,7 @@ function fromHex(hex) {
 
 function createCsrBodyEc(domains, xy) {
   var altnames = domains.map(function (d) {
-    return csrDomains.replace(/{dlen}/, numToHex(d.length)).replace(/{domain\.tld}/, strToHex(d));
+    return ASN1('82', strToHex(d));
   }).join('').replace(/\s+/g, '');
   var sublen = domains[0].length;
   var sanlen = (altnames.length/2);
@@ -272,56 +277,54 @@ function createCsrBodyEc(domains, xy) {
     hxy += toHex(xy.y);
   }
 
+  var version = ASN1.UInt('00');
+  var subject = ASN1('30'
+    , ASN1('31'
+      , ASN1('30'
+          // object id (commonName)
+        , ASN1('06', '55 04 03')
+        , ASN1('0C', strToHex(domains[0])))));
+  var pubkey = ASN1('30'
+    , ASN1('30'
+        // 1.2.840.10045.2.1 ecPublicKey
+        // (ANSI X9.62 public key type)
+      , ASN1('06', '2A 86 48 CE 3D 02 01')
+        // 1.2.840.10045.3.1.7 prime256v1
+        // (ANSI X9.62 named elliptic curve)
+      , ASN1('06', '2A 86 48 CE 3D 03 01 07')
+      )
+    , ASN1.BitStr(compression + hxy));
+  var altnames = ASN1('A0'
+    , ASN1('30'
+        // (extensionRequest (PKCS #9 via CRMF))
+      , ASN1('06', '2A 86 48 86 F7 0D 01 09 0E')
+      , ASN1('31'
+        , ASN1('30'
+          , ASN1('30'
+              // (subjectAltName (X.509 extension))
+            , ASN1('06', '55 1D 11')
+            , ASN1('04'
+              , ASN1('30', domains.map(function (d) {
+                  return csrDomains.replace(/{dlen}/, numToHex(d.length)).replace(/{domain\.tld}/, strToHex(d));
+                }).join(''))))))));
   var body = [ '30 81 {+85+n}'                                        // 4 bytes, sequence
-    .replace(/{[^}]+}/, numToHex(
-        3
-      + 13 + sublen
-      + 27 + publen // Length for EC-related P-256 stuff
-      + 30 + sanlen
-    ))
+    .replace(/{[^}]+}/, numToHex(3 + 13 + sublen + 27 + publen + 30 + sanlen))
 
       // #0 Total 3
-    , ASN1('02', '00')
+    , version
 
       // Subject
       // #1 Total 2+11+n
-    , ASN1('30'
-      , ASN1('31'
-        , ASN1('30'
-            // object id (commonName)
-          , ASN1('06', '55 04 03')
-          , ASN1('0C', strToHex(domains[0]))
-          )
-        )
-      )
+    , subject
 
       // P-256 Public Key
       // #2 Total 2+25+xy
-    , ASN1('30'
-      , ASN1('30'
-          // 1.2.840.10045.2.1 ecPublicKey
-          // (ANSI X9.62 public key type)
-        , ASN1('06', '2A 86 48 CE 3D 02 01')
-          // 1.2.840.10045.3.1.7 prime256v1
-          // (ANSI X9.62 named elliptic curve)
-        , ASN1('06', '2A 86 48 CE 3D 03 01 07')
-        )
-      , BITSTR(compression + hxy)
-      )
+    , pubkey
 
       // Altnames
       // #3 Total 2+28+n
-    , ASN1('A0'
-      , ASN1('30'
-          // (extensionRequest (PKCS #9 via CRMF))
-        , ASN1('06', '2A 86 48 86 F7 0D 01 09 0E')
-        , ASN1('31'
-          , ASN1('30'
-            , ASN1('30'
-                // (subjectAltName (X.509 extension))
-              , ASN1('06', '55 1D 11')
-              , ASN1('04'
-                , ASN1('30', altnames)))))))  ];
+    , altnames
+    ];
   body = body.join('').replace(/\s+/g, '');
   return fromHex(body);
 }