File: libs/js/pidCrypt/javascripts/original scripts/asn1.js

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File: libs/js/pidCrypt/javascripts/original scripts/asn1.js
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Description: Class source
Class: jQuery.pidCrypt
Encrypt form values using RSA and AES
Author: By
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Date: 3 months ago
Size: 13,525 bytes
 

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// ASN.1 JavaScript decoder // Copyright (c) 2008-2009 Lapo Luchini <lapo@lapo.it> // Permission to use, copy, modify, and/or distribute this software for any // purpose with or without fee is hereby granted, provided that the above // copyright notice and this permission notice appear in all copies. // // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. function Stream(enc, pos) { if (enc instanceof Stream) { this.enc = enc.enc; this.pos = enc.pos; } else { this.enc = enc; this.pos = pos; } } Stream.prototype.get = function(pos) { if (pos == undefined) pos = this.pos++; if (pos >= this.enc.length) throw 'Requesting byte offset ' + pos + ' on a stream of length ' + this.enc.length; return this.enc[pos]; } Stream.prototype.hexDigits = "0123456789ABCDEF"; Stream.prototype.hexDump = function(start, end) { var s = ""; for (var i = start; i < end; ++i) { var h = this.get(i); s += this.hexDigits.charAt(h >> 4) + this.hexDigits.charAt(h & 0xF); if ((i & 0xF) == 0x7) s += ' '; s += ((i & 0xF) == 0xF) ? '\n' : ' '; } return s; } Stream.prototype.parseStringISO = function(start, end) { var s = ""; for (var i = start; i < end; ++i) s += String.fromCharCode(this.get(i)); return s; } Stream.prototype.parseStringUTF = function(start, end) { var s = "", c = 0; for (var i = start; i < end; ) { var c = this.get(i++); if (c < 128) s += String.fromCharCode(c); else if ((c > 191) && (c < 224)) s += String.fromCharCode(((c & 0x1F) << 6) | (this.get(i++) & 0x3F)); else s += String.fromCharCode(((c & 0x0F) << 12) | ((this.get(i++) & 0x3F) << 6) | (this.get(i++) & 0x3F)); //TODO: this doesn't check properly 'end', some char could begin before and end after } return s; } Stream.prototype.reTime = /^((?:1[89]|2\d)?\d\d)(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])([01]\d|2[0-3])(?:([0-5]\d)(?:([0-5]\d)(?:[.,](\d{1,3}))?)?)?(Z|[-+](?:[0]\d|1[0-2])([0-5]\d)?)?$/; Stream.prototype.parseTime = function(start, end) { var s = this.parseStringISO(start, end); var m = this.reTime.exec(s); if (!m) return "Unrecognized time: " + s; s = m[1] + "-" + m[2] + "-" + m[3] + " " + m[4]; if (m[5]) { s += ":" + m[5]; if (m[6]) { s += ":" + m[6]; if (m[7]) s += "." + m[7]; } } if (m[8]) { s += " UTC"; if (m[8] != 'Z') { s += m[8]; if (m[9]) s += ":" + m[9]; } } return s; } Stream.prototype.parseInteger = function(start, end) { if ((end - start) > 4) return undefined; //TODO support negative numbers var n = 0; for (var i = start; i < end; ++i) n = (n << 8) | this.get(i); return n; } Stream.prototype.parseOID = function(start, end) { var s, n = 0, bits = 0; for (var i = start; i < end; ++i) { var v = this.get(i); n = (n << 7) | (v & 0x7F); bits += 7; if (!(v & 0x80)) { // finished if (s == undefined) s = parseInt(n / 40) + "." + (n % 40); else s += "." + ((bits >= 31) ? "big" : n); n = bits = 0; } s += String.fromCharCode(); } return s; } function ASN1(stream, header, length, tag, sub) { this.stream = stream; this.header = header; this.length = length; this.tag = tag; this.sub = sub; } ASN1.prototype.typeName = function() { if (this.tag == undefined) return "unknown"; var tagClass = this.tag >> 6; var tagConstructed = (this.tag >> 5) & 1; var tagNumber = this.tag & 0x1F; switch (tagClass) { case 0: // universal switch (tagNumber) { case 0x00: return "EOC"; case 0x01: return "BOOLEAN"; case 0x02: return "INTEGER"; case 0x03: return "BIT_STRING"; case 0x04: return "OCTET_STRING"; case 0x05: return "NULL"; case 0x06: return "OBJECT_IDENTIFIER"; case 0x07: return "ObjectDescriptor"; case 0x08: return "EXTERNAL"; case 0x09: return "REAL"; case 0x0A: return "ENUMERATED"; case 0x0B: return "EMBEDDED_PDV"; case 0x0C: return "UTF8String"; case 0x10: return "SEQUENCE"; case 0x11: return "SET"; case 0x12: return "NumericString"; case 0x13: return "PrintableString"; // ASCII subset case 0x14: return "TeletexString"; // aka T61String case 0x15: return "VideotexString"; case 0x16: return "IA5String"; // ASCII case 0x17: return "UTCTime"; case 0x18: return "GeneralizedTime"; case 0x19: return "GraphicString"; case 0x1A: return "VisibleString"; // ASCII subset case 0x1B: return "GeneralString"; case 0x1C: return "UniversalString"; case 0x1E: return "BMPString"; default: return "Universal_" + tagNumber.toString(16); } case 1: return "Application_" + tagNumber.toString(16); case 2: return "[" + tagNumber + "]"; // Context case 3: return "Private_" + tagNumber.toString(16); } } ASN1.prototype.content = function() { if (this.tag == undefined) return null; var tagClass = this.tag >> 6; if (tagClass != 0) // universal return null; var tagNumber = this.tag & 0x1F; var content = this.posContent(); var len = Math.abs(this.length); switch (tagNumber) { case 0x01: // BOOLEAN return (this.stream.get(content) == 0) ? "false" : "true"; case 0x02: // INTEGER return this.stream.parseInteger(content, content + len); //case 0x03: // BIT_STRING //case 0x04: // OCTET_STRING //case 0x05: // NULL case 0x06: // OBJECT_IDENTIFIER return this.stream.parseOID(content, content + len); //case 0x07: // ObjectDescriptor //case 0x08: // EXTERNAL //case 0x09: // REAL //case 0x0A: // ENUMERATED //case 0x0B: // EMBEDDED_PDV //case 0x10: // SEQUENCE //case 0x11: // SET case 0x0C: // UTF8String return this.stream.parseStringUTF(content, content + len); case 0x12: // NumericString case 0x13: // PrintableString case 0x14: // TeletexString case 0x15: // VideotexString case 0x16: // IA5String //case 0x19: // GraphicString case 0x1A: // VisibleString //case 0x1B: // GeneralString //case 0x1C: // UniversalString //case 0x1E: // BMPString return this.stream.parseStringISO(content, content + len); case 0x17: // UTCTime case 0x18: // GeneralizedTime return this.stream.parseTime(content, content + len); } return null; } ASN1.prototype.toString = function() { return this.typeName() + "@" + this.stream.pos + "[header:" + this.header + ",length:" + this.length + ",sub:" + ((this.sub == null) ? 'null' : this.sub.length) + "]"; } ASN1.prototype.print = function(indent) { if (indent == undefined) indent = ''; document.writeln(indent + this); if (this.sub != null) { indent += ' '; for (var i = 0, max = this.sub.length; i < max; ++i) this.sub[i].print(indent); } } ASN1.prototype.toPrettyString = function(indent) { if (indent == undefined) indent = ''; var s = indent + this.typeName() + " @" + this.stream.pos; if (this.length >= 0) s += "+"; s += this.length; if (this.tag & 0x20) s += " (constructed)"; else if (((this.tag == 0x03) || (this.tag == 0x04)) && (this.sub != null)) s += " (encapsulates)"; s += "\n"; if (this.sub != null) { indent += ' '; for (var i = 0, max = this.sub.length; i < max; ++i) s += this.sub[i].toPrettyString(indent); } return s; } ASN1.prototype.toDOM = function() { var node = document.createElement("div"); node.className = "node"; node.asn1 = this; var head = document.createElement("div"); head.className = "head"; var s = this.typeName(); head.innerHTML = s; node.appendChild(head); this.head = head; var value = document.createElement("div"); value.className = "value"; s = "Offset: " + this.stream.pos + "<br/>"; s += "Length: " + this.header + "+"; if (this.length >= 0) s += this.length; else s += (-this.length) + " (undefined)"; if (this.tag & 0x20) s += "<br/>(constructed)"; else if (((this.tag == 0x03) || (this.tag == 0x04)) && (this.sub != null)) s += "<br/>(encapsulates)"; var content = this.content(); if (content != null) { s += "<br/>Value:<br/><b>" + content + "</b>"; if ((typeof(oids) == 'object') && (this.tag == 0x06)) { var oid = oids[content]; if (oid) { if (oid.d) s += "<br/>" + oid.d; if (oid.c) s += "<br/>" + oid.c; if (oid.w) s += "<br/>(warning!)"; } } } value.innerHTML = s; node.appendChild(value); var sub = document.createElement("div"); sub.className = "sub"; if (this.sub != null) { for (var i = 0, max = this.sub.length; i < max; ++i) sub.appendChild(this.sub[i].toDOM()); } node.appendChild(sub); head.switchNode = node; head.onclick = function() { var node = this.switchNode; node.className = (node.className == "node collapsed") ? "node" : "node collapsed"; }; return node; } ASN1.prototype.posStart = function() { return this.stream.pos; } ASN1.prototype.posContent = function() { return this.stream.pos + this.header; } ASN1.prototype.posEnd = function() { return this.stream.pos + this.header + Math.abs(this.length); } ASN1.prototype.toHexDOM_sub = function(node, className, stream, start, end) { if (start >= end) return; var sub = document.createElement("span"); sub.className = className; sub.appendChild(document.createTextNode( stream.hexDump(start, end))); node.appendChild(sub); } ASN1.prototype.toHexDOM = function() { var node = document.createElement("span"); node.className = 'hex'; this.head.hexNode = node; this.head.onmouseover = function() { this.hexNode.className = 'hexCurrent'; } this.head.onmouseout = function() { this.hexNode.className = 'hex'; } this.toHexDOM_sub(node, "tag", this.stream, this.posStart(), this.posStart() + 1); this.toHexDOM_sub(node, (this.length >= 0) ? "dlen" : "ulen", this.stream, this.posStart() + 1, this.posContent()); if (this.sub == null) node.appendChild(document.createTextNode( this.stream.hexDump(this.posContent(), this.posEnd()))); else if (this.sub.length > 0) { var first = this.sub[0]; var last = this.sub[this.sub.length - 1]; this.toHexDOM_sub(node, "intro", this.stream, this.posContent(), first.posStart()); for (var i = 0, max = this.sub.length; i < max; ++i) node.appendChild(this.sub[i].toHexDOM()); this.toHexDOM_sub(node, "outro", this.stream, last.posEnd(), this.posEnd()); } return node; } /* ASN1.prototype.getValue = function() { TODO } */ ASN1.decodeLength = function(stream) { var buf = stream.get(); var len = buf & 0x7F; if (len == buf) return len; if (len > 3) throw "Length over 24 bits not supported at position " + (stream.pos - 1); if (len == 0) return -1; // undefined buf = 0; for (var i = 0; i < len; ++i) buf = (buf << 8) | stream.get(); return buf; } ASN1.hasContent = function(tag, len, stream) { if (tag & 0x20) // constructed return true; if ((tag < 0x03) || (tag > 0x04)) return false; var p = new Stream(stream); if (tag == 0x03) p.get(); // BitString unused bits, must be in [0, 7] var subTag = p.get(); if ((subTag >> 6) & 0x01) // not (universal or context) return false; try { var subLength = ASN1.decodeLength(p); return ((p.pos - stream.pos) + subLength == len); } catch (exception) { return false; } } ASN1.decode = function(stream) { if (!(stream instanceof Stream)) stream = new Stream(stream, 0); var streamStart = new Stream(stream); var tag = stream.get(); var len = ASN1.decodeLength(stream); var header = stream.pos - streamStart.pos; var sub = null; if (ASN1.hasContent(tag, len, stream)) { // it has content, so we decode it var start = stream.pos; if (tag == 0x03) stream.get(); // skip BitString unused bits, must be in [0, 7] sub = []; if (len >= 0) { // definite length var end = start + len; while (stream.pos < end) sub[sub.length] = ASN1.decode(stream); if (stream.pos != end) throw "Content size is not correct for container starting at offset " + start; } else { // undefined length try { for (;;) { var s = ASN1.decode(stream); if (s.tag == 0) break; sub[sub.length] = s; } len = start - stream.pos; } catch (e) { throw "Exception while decoding undefined length content: " + e; } } } else stream.pos += len; // skip content return new ASN1(streamStart, header, len, tag, sub); } ASN1.test = function() { var test = [ { value: [0x27], expected: 0x27 }, { value: [0x81, 0xC9], expected: 0xC9 }, { value: [0x83, 0xFE, 0xDC, 0xBA], expected: 0xFEDCBA }, ]; for (var i = 0, max = test.length; i < max; ++i) { var pos = 0; var stream = new Stream(test[i].value, 0); var res = ASN1.decodeLength(stream); if (res != test[i].expected) document.write("In test[" + i + "] expected " + test[i].expected + " got " + res + "\n"); } }