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@ -76,13 +76,14 @@ ASN1.BitStr = function BITSTR() { |
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//
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ASN1.ELOOP = "uASN1.js Error: iterated over 15+ elements (probably a malformed file)"; |
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ASN1.EDEEP = "uASN1.js Error: element nested 10+ layers deep (probably a malformed file)"; |
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ASN1.EDEEP = "uASN1.js Error: element nested 20+ layers deep (probably a malformed file)"; |
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// Container Types are Sequence 0x30, Octect String 0x04, Array? (0xA0, 0xA1)
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// Value Types are Integer 0x02, Bit String 0x03, Null 0x05, Object ID 0x06,
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// Sometimes Bit String is used as a container (RSA Pub Spki)
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ASN1.VTYPES = [ 0x02, 0x03, 0x05, 0x06 ]; |
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ASN1.parse = function parseAsn1(buf, depth) { |
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if (depth >= 10) { throw new Error(ASN1.EDEEP); } |
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ASN1.VTYPES = [ 0x02, 0x03, 0x05, 0x06, 0x0c, 0x82 ]; |
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ASN1.parse = function parseAsn1(buf, depth, ws) { |
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if (!ws) { ws = ''; } |
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if (depth >= 20) { throw new Error(ASN1.EDEEP); } |
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var index = 2; // we know, at minimum, data starts after type (0) and lengthSize (1)
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var asn1 = { type: buf[0], lengthSize: 0, length: buf[1] }; |
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@ -108,9 +109,10 @@ ASN1.parse = function parseAsn1(buf, depth) { |
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adjust = -1; |
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} |
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} |
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adjustedLen = asn1.length + adjust; |
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//console.warn(ws + '0x' + Enc.numToHex(asn1.type), index, 'len:', asn1.length, asn1);
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// this is a primitive value type
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if (-1 !== ASN1.VTYPES.indexOf(asn1.type)) { |
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asn1.value = buf.slice(index, index + adjustedLen); |
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@ -118,11 +120,28 @@ ASN1.parse = function parseAsn1(buf, depth) { |
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} |
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asn1.children = []; |
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while (iters < 15 && index <= asn1.length) { |
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//console.warn('1 len:', (2 + asn1.lengthSize + asn1.length), 'idx:', index, 'clen:', 0);
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while (iters < 15 && index < (2 + asn1.length + asn1.lengthSize)) { |
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iters += 1; |
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child = ASN1.parse(buf.slice(index, index + adjustedLen), (depth || 0) + 1); |
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child = ASN1.parse(buf.slice(index, index + adjustedLen), (depth || 0) + 1, ws + ' '); |
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// The numbers don't match up exactly and I don't remember why...
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// probably something with adjustedLen or some such, but the tests pass
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index += (2 + child.lengthSize + child.length); |
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//console.warn('2 len:', (2 + asn1.lengthSize + asn1.length), 'idx:', index, 'clen:', (2 + child.lengthSize + child.length));
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if (index > (2 + asn1.lengthSize + asn1.length)) { |
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console.error(JSON.stringify(asn1, function (k, v) { |
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if ('value' === k) { return '0x' + Enc.bufToHex(v.data); } return v; |
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}, 2)); |
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throw new Error("Parse error: child value length (" + child.length |
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+ ") is greater than remaining parent length (" + (asn1.length - index) |
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+ " = " + asn1.length + " - " + index + ")"); |
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} |
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asn1.children.push(child); |
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//console.warn(ws + '0x' + Enc.numToHex(asn1.type), index, 'len:', asn1.length, asn1);
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} |
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if (index !== (2 + asn1.lengthSize + asn1.length)) { |
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console.warn('index:', index, 'length:', (2 + asn1.lengthSize + asn1.length)) |
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throw new Error("premature end-of-file"); |
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} |
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if (iters >= 15) { throw new Error(ASN1.ELOOP); } |
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@ -153,7 +172,8 @@ ASN1._stringify = function(asn1) { |
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ASN1.tpl = function (asn1) { |
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//console.log(JSON.stringify(asn1, null, 2));
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//console.log(asn1);
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var ws = '\t'; |
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var sp = ' '; |
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var ws = sp; |
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var i = 0; |
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var vars = []; |
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var str = ws; |
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@ -177,8 +197,8 @@ ASN1.tpl = function (asn1) { |
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if (0x05 !== asn1.type) { |
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if (0x06 !== asn1.type) { |
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val = asn1.value || new Uint8Array(0); |
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vars.push("// 0x" + Enc.numToHex(val.byteLength) + " (" + val.byteLength + " bytes)\nopts.tpl" + i + " = '" |
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+ Enc.bufToHex(val) + "';"); |
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vars.push("\n// 0x" + Enc.numToHex(val.byteLength) + " (" + val.byteLength + " bytes)\nopts.tpl" + i + " = '" |
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+ Enc.bufToHex(val) + "';"); |
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if (0x02 !== asn1.type && 0x03 !== asn1.type) { |
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str += ", "; |
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} |
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@ -186,15 +206,17 @@ ASN1.tpl = function (asn1) { |
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} else { |
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str += ", '" + Enc.bufToHex(asn1.value) + "'"; |
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} |
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} else { |
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console.warn("XXXXXXXXXXXXXXXXXXXXX"); |
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} |
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str += ")"; |
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return ; |
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} |
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asn1.children.forEach(function (a, j) { |
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i += 1; |
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ws += '\t'; |
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ws += sp; |
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write(a, j); |
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ws = ws.slice(1); |
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ws = ws.slice(sp.length); |
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}); |
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str += "\n" + ws + ")"; |
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} |
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@ -204,8 +226,10 @@ ASN1.tpl = function (asn1) { |
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console.log(vars.join('\n') + '\n'); |
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console.log(); |
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console.log('function buildSchema(opts) {'); |
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console.log('\treturn Enc.hexToBuf(' + str.slice(3) + ');'); |
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console.log(sp + 'return Enc.hexToBuf(' + str.slice(3) + ');'); |
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console.log('}'); |
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console.log(); |
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console.log('buildSchema(opts);'); |
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}; |
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module.exports = ASN1; |
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