v0.8.2: bugfix ASN1 null, integer 0, and incorrect byte length

bin/rasha.js

@@ -3,6 +3,8 @@
 
 var fs = require('fs');
 var Rasha = require('../index.js');
+var PEM = require('../lib/pem.js');
+var ASN1 = require('../lib/asn1.js');
 
 var infile = process.argv[2];
 var format = process.argv[3];
@@ -16,6 +18,12 @@ try {
 }
 
 if ('string' === typeof key) {
+  if ('tpl' === format) {
+    var block = PEM.parseBlock(key);
+    var asn1 = ASN1.parse(block.der);
+    ASN1.tpl(asn1);
+    return;
+  }
   var pub = (-1 !== [ 'public', 'spki', 'pkix' ].indexOf(format));
   Rasha.import({ pem: key, public: (pub || format) }).then(function (jwk) {
     console.info(JSON.stringify(jwk, null, 2));

lib/asn1.js

@@ -89,6 +89,7 @@ ASN1.parse = function parseAsn1(buf, depth) {
   var child;
   var iters = 0;
   var adjust = 0;
+  var adjustedLen;
 
   // Determine how many bytes the length uses, and what it is
   if (0x80 & asn1.length) {
@@ -101,20 +102,25 @@ ASN1.parse = function parseAsn1(buf, depth) {
   // High-order bit Integers have a leading 0x00 to signify that they are positive.
   // Bit Streams use the first byte to signify padding, which x.509 doesn't use.
   if (0x00 === buf[index] && (0x02 === asn1.type || 0x03 === asn1.type)) {
-    index += 1;
-    adjust = -1;
+    // However, 0x00 on its own is a valid number
+    if (asn1.length > 1) {
+      index += 1;
+      adjust = -1;
+    }
   }
 
+  adjustedLen = asn1.length + adjust;
+
   // this is a primitive value type
   if (-1 !== ASN1.VTYPES.indexOf(asn1.type)) {
-    asn1.value = buf.slice(index, index + asn1.length + adjust);
+    asn1.value = buf.slice(index, index + adjustedLen);
     return asn1;
   }
 
   asn1.children = [];
-  while (iters < 15 && index < buf.byteLength) {
+  while (iters < 15 && index <= asn1.length) {
     iters += 1;
-    child = ASN1.parse(buf.slice(index, index + asn1.length), (depth || 0) + 1);
+    child = ASN1.parse(buf.slice(index, index + adjustedLen), (depth || 0) + 1);
     index += (2 + child.lengthSize + child.length);
     asn1.children.push(child);
   }
@@ -144,4 +150,50 @@ ASN1._stringify = function(asn1) {
 };
 */
 
+ASN1.tpl = function (asn1) {
+  //console.log(JSON.stringify(asn1, null, 2));
+  //console.log(asn1);
+  var ws = '';
+  var i = 0;
+  var vars = [];
+  var str = ws;
+
+  function write(asn1, k) {
+    str += "\n" + ws;
+    var val;
+    if ('number' !== typeof k) {
+      // ignore
+    } else if (k) {
+      str += ', ';
+    } else {
+      str += '  ';
+    }
+    if (0x02 === asn1.type) {
+      str += "ASN1.UInt(";
+    } else if (0x03 === asn1.type) {
+      str += "ASN1.BitStr(";
+    } else {
+      str += "ASN1('" + Buffer.from([asn1.type]).toString('hex') + "', ";
+    }
+    if (!asn1.children) {
+      val = Buffer.from(asn1.value || '');
+      vars.push("// " + val.byteLength + " bytes\nvar tpl" + i + " = '"
+        + val.toString('hex') + "';");
+      str += "tpl" + i + ")";
+      return ;
+    }
+    asn1.children.forEach(function (a, j) {
+      i += 1;
+      ws += '\t';
+      write(a, j);
+      ws = ws.slice(1);
+    });
+    str += "\n" + ws + ")";
+  }
+
+  write(asn1);
+  console.log(vars.join('\n') + '\n');
+  console.log(str + ';');
+};
+
 module.exports = ASN1;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rasha",
-  "version": "0.8.0",
+  "version": "0.8.2",
   "description": "PEM-to-JWK and JWK-to-PEM for RSA keys in a lightweight, zero-dependency library focused on perfect universal compatibility.",
   "homepage": "https://git.coolaj86.com/coolaj86/rasha.js",
   "main": "index.js",