From 2babbeb1dc60865779166b62319c812b2ff326e2 Mon Sep 17 00:00:00 2001 From: AJ ONeal Date: Mon, 17 Dec 2018 23:44:16 -0700 Subject: [PATCH] rm asn1.js --- lib/asn1.js | 235 ---------------------------------------------------- 1 file changed, 235 deletions(-) delete mode 100644 lib/asn1.js diff --git a/lib/asn1.js b/lib/asn1.js deleted file mode 100644 index bce9568..0000000 --- a/lib/asn1.js +++ /dev/null @@ -1,235 +0,0 @@ -'use strict'; - -// -// A dumbed-down, minimal ASN.1 parser / packer combo -// -// Note: generally I like to write congruent code -// (i.e. output can be used as input and vice-versa) -// However, this seemed to be more readable and easier -// to use written as-is, asymmetrically. -// (I also generally prefer to export objects rather -// functions but, yet again, asthetics one in this case) - -var Enc = require('./encoding.js'); - -// -// Packer -// - -// Almost every ASN.1 type that's important for CSR -// can be represented generically with only a few rules. -var ASN1 = module.exports = function ASN1(/*type, hexstrings...*/) { - var args = Array.prototype.slice.call(arguments); - var typ = args.shift(); - var str = args.join('').replace(/\s+/g, '').toLowerCase(); - var len = (str.length/2); - var lenlen = 0; - var hex = typ; - - // We can't have an odd number of hex chars - if (len !== Math.round(len)) { - throw new Error("invalid hex"); - } - - // The first byte of any ASN.1 sequence is the type (Sequence, Integer, etc) - // The second byte is either the size of the value, or the size of its size - - // 1. If the second byte is < 0x80 (128) it is considered the size - // 2. If it is > 0x80 then it describes the number of bytes of the size - // ex: 0x82 means the next 2 bytes describe the size of the value - // 3. The special case of exactly 0x80 is "indefinite" length (to end-of-file) - - if (len > 127) { - lenlen += 1; - while (len > 255) { - lenlen += 1; - len = len >> 8; - } - } - - if (lenlen) { hex += Enc.numToHex(0x80 + lenlen); } - return hex + Enc.numToHex(str.length/2) + str; -}; - -// The Integer type has some special rules -ASN1.UInt = function UINT() { - var str = Array.prototype.slice.call(arguments).join(''); - var first = parseInt(str.slice(0, 2), 16); - - // If the first byte is 0x80 or greater, the number is considered negative - // Therefore we add a '00' prefix if the 0x80 bit is set - if (0x80 & first) { str = '00' + str; } - - return ASN1('02', str); -}; - -// The Bit String type also has a special rule -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); -}; - - -// -// Parser -// - -ASN1.ELOOP = "uASN1.js Error: iterated over 15+ elements (probably a malformed file)"; -ASN1.EDEEP = "uASN1.js Error: element nested 20+ layers deep (probably a malformed file)"; -// Container Types are Sequence 0x30, Octect String 0x04, Array? (0xA0, 0xA1) -// Value Types are Integer 0x02, Bit String 0x03, Null 0x05, Object ID 0x06, -// Sometimes Bit String is used as a container (RSA Pub Spki) -ASN1.VTYPES = [ 0x02, 0x03, 0x05, 0x06, 0x0c, 0x82 ]; -ASN1.parse = function parseAsn1(buf, depth, ws) { - if (!ws) { ws = ''; } - if (depth >= 20) { throw new Error(ASN1.EDEEP); } - - var index = 2; // we know, at minimum, data starts after type (0) and lengthSize (1) - var asn1 = { type: buf[0], lengthSize: 0, length: buf[1] }; - 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) { - asn1.lengthSize = 0x7f & asn1.length; - // I think that buf->hex->int solves the problem of Endianness... not sure - asn1.length = parseInt(Enc.bufToHex(buf.slice(index, index + asn1.lengthSize)), 16); - index += asn1.lengthSize; - } - - // 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)) { - // However, 0x00 on its own is a valid number - if (asn1.length > 1) { - index += 1; - adjust = -1; - } - } - adjustedLen = asn1.length + adjust; - - //console.warn(ws + '0x' + Enc.numToHex(asn1.type), index, 'len:', asn1.length, asn1); - - // this is a primitive value type - if (-1 !== ASN1.VTYPES.indexOf(asn1.type)) { - asn1.value = buf.slice(index, index + adjustedLen); - return asn1; - } - - asn1.children = []; - //console.warn('1 len:', (2 + asn1.lengthSize + asn1.length), 'idx:', index, 'clen:', 0); - while (iters < 15 && index < (2 + asn1.length + asn1.lengthSize)) { - iters += 1; - child = ASN1.parse(buf.slice(index, index + adjustedLen), (depth || 0) + 1, ws + ' '); - // The numbers don't match up exactly and I don't remember why... - // probably something with adjustedLen or some such, but the tests pass - index += (2 + child.lengthSize + child.length); - //console.warn('2 len:', (2 + asn1.lengthSize + asn1.length), 'idx:', index, 'clen:', (2 + child.lengthSize + child.length)); - if (index > (2 + asn1.lengthSize + asn1.length)) { - console.error(JSON.stringify(asn1, function (k, v) { - if ('value' === k) { return '0x' + Enc.bufToHex(v.data); } return v; - }, 2)); - throw new Error("Parse error: child value length (" + child.length - + ") is greater than remaining parent length (" + (asn1.length - index) - + " = " + asn1.length + " - " + index + ")"); - } - asn1.children.push(child); - //console.warn(ws + '0x' + Enc.numToHex(asn1.type), index, 'len:', asn1.length, asn1); - } - if (index !== (2 + asn1.lengthSize + asn1.length)) { - console.warn('index:', index, 'length:', (2 + asn1.lengthSize + asn1.length)) - throw new Error("premature end-of-file"); - } - if (iters >= 15) { throw new Error(ASN1.ELOOP); } - - return asn1; -}; - -/* -ASN1._stringify = function(asn1) { - //console.log(JSON.stringify(asn1, null, 2)); - //console.log(asn1); - var ws = ''; - - function write(asn1) { - console.log(ws, 'ch', Enc.numToHex(asn1.type), asn1.length); - if (!asn1.children) { - return; - } - asn1.children.forEach(function (a) { - ws += '\t'; - write(a); - ws = ws.slice(1); - }); - } - write(asn1); -}; -*/ - -ASN1.tpl = function (asn1) { - //console.log(JSON.stringify(asn1, null, 2)); - //console.log(asn1); - var sp = ' '; - var ws = sp; - var i = 0; - var vars = []; - var str = ws; - - function write(asn1, k) { - str += "\n" + ws; - var val; - if ('number' !== typeof k) { - // ignore - } else { - str += ', '; - } - if (0x02 === asn1.type) { - str += "ASN1.UInt("; - } else if (0x03 === asn1.type) { - str += "ASN1.BitStr("; - } else { - str += "ASN1('" + Enc.numToHex(asn1.type) + "'"; - } - if (!asn1.children) { - if (0x05 !== asn1.type) { - if (0x06 !== asn1.type) { - val = asn1.value || new Uint8Array(0); - vars.push("\n// 0x" + Enc.numToHex(val.byteLength) + " (" + val.byteLength + " bytes)\nopts.tpl" + i + " = '" - + Enc.bufToHex(val) + "';"); - if (0x02 !== asn1.type && 0x03 !== asn1.type) { - str += ", "; - } - str += "Enc.bufToHex(opts.tpl" + i + ")"; - } else { - str += ", '" + Enc.bufToHex(asn1.value) + "'"; - } - } else { - console.warn("XXXXXXXXXXXXXXXXXXXXX"); - } - str += ")"; - return ; - } - asn1.children.forEach(function (a, j) { - i += 1; - ws += sp; - write(a, j); - ws = ws.slice(sp.length); - }); - str += "\n" + ws + ")"; - } - - write(asn1); - console.log('var opts = {};'); - console.log(vars.join('\n') + '\n'); - console.log(); - console.log('function buildSchema(opts) {'); - console.log(sp + 'return Enc.hexToBuf(' + str.slice(3) + ');'); - console.log('}'); - console.log(); - console.log('buildSchema(opts);'); -}; - -module.exports = ASN1;