@proton/ccxt
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A JavaScript / TypeScript / Python / C# / PHP cryptocurrency trading library with support for 130+ exchanges
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JavaScript
// ----------------------------------------------------------------------------
// PLEASE DO NOT EDIT THIS FILE, IT IS GENERATED AND WILL BE OVERWRITTEN:
// https://github.com/ccxt/ccxt/blob/master/CONTRIBUTING.md#how-to-contribute-code
// EDIT THE CORRESPONDENT .ts FILE INSTEAD
// ASN.1 JavaScript decoder
// Copyright (c) 2008-2014 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.
/*jshint browser: true, strict: true, immed: true, latedef: true, undef: true, regexdash: false */
/*global oids */
import { Int10 } from "./int10.js";
const ellipsis = "\u2026";
const reTimeS = /^(\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)?)?$/;
const reTimeL = /^(\d\d\d\d)(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])([01]\d|2[0-3])(?:([0-5]\d)(?:([0-5]\d)(?:[.,](\d{1,3}))?)?)?(Z|[-+](?:[0]\d|1[0-2])([0-5]\d)?)?$/;
function stringCut(str, len) {
if (str.length > len) {
str = str.substring(0, len) + ellipsis;
}
return str;
}
export class Stream {
constructor(enc, pos) {
this.hexDigits = "0123456789ABCDEF";
if (enc instanceof Stream) {
this.enc = enc.enc;
this.pos = enc.pos;
}
else {
// enc should be an array or a binary string
this.enc = enc;
this.pos = pos;
}
}
get(pos) {
if (pos === undefined) {
pos = this.pos++;
}
if (pos >= this.enc.length) {
throw new Error(`Requesting byte offset ${pos} on a stream of length ${this.enc.length}`);
}
return ("string" === typeof this.enc) ? this.enc.charCodeAt(pos) : this.enc[pos];
}
hexByte(b) {
return this.hexDigits.charAt((b >> 4) & 0xF) + this.hexDigits.charAt(b & 0xF);
}
hexDump(start, end, raw) {
let s = "";
for (let i = start; i < end; ++i) {
s += this.hexByte(this.get(i));
if (raw !== true) {
switch (i & 0xF) {
case 0x7:
s += " ";
break;
case 0xF:
s += "\n";
break;
default:
s += " ";
}
}
}
return s;
}
isASCII(start, end) {
for (let i = start; i < end; ++i) {
const c = this.get(i);
if (c < 32 || c > 176) {
return false;
}
}
return true;
}
parseStringISO(start, end) {
let s = "";
for (let i = start; i < end; ++i) {
s += String.fromCharCode(this.get(i));
}
return s;
}
parseStringUTF(start, end) {
let s = "";
for (let i = start; i < end;) {
const 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));
}
}
return s;
}
parseStringBMP(start, end) {
let str = "";
let hi;
let lo;
for (let i = start; i < end;) {
hi = this.get(i++);
lo = this.get(i++);
str += String.fromCharCode((hi << 8) | lo);
}
return str;
}
parseTime(start, end, shortYear) {
let s = this.parseStringISO(start, end);
const m = (shortYear ? reTimeS : reTimeL).exec(s);
if (!m) {
return "Unrecognized time: " + s;
}
if (shortYear) {
// to avoid querying the timer, use the fixed range [1970, 2069]
// it will conform with ITU X.400 [-10, +40] sliding window until 2030
m[1] = +m[1];
m[1] += (+m[1] < 70) ? 2000 : 1900;
}
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;
}
parseInteger(start, end) {
let v = this.get(start);
const neg = (v > 127);
const pad = neg ? 255 : 0;
let len;
let s = "";
// skip unuseful bits (not allowed in DER)
while (v == pad && ++start < end) {
v = this.get(start);
}
len = end - start;
if (len === 0) {
return neg ? -1 : 0;
}
// show bit length of huge integers
if (len > 4) {
s = v;
len <<= 3;
while (((+s ^ pad) & 0x80) == 0) {
s = +s << 1;
--len;
}
s = "(" + len + " bit)\n";
}
// decode the integer
if (neg) {
v = v - 256;
}
const n = new Int10(v);
for (let i = start + 1; i < end; ++i) {
n.mulAdd(256, this.get(i));
}
return s + n.toString();
}
parseBitString(start, end, maxLength) {
const unusedBit = this.get(start);
const lenBit = ((end - start - 1) << 3) - unusedBit;
const intro = "(" + lenBit + " bit)\n";
let s = "";
for (let i = start + 1; i < end; ++i) {
const b = this.get(i);
const skip = (i == end - 1) ? unusedBit : 0;
for (let j = 7; j >= skip; --j) {
s += (b >> j) & 1 ? "1" : "0";
}
if (s.length > maxLength) {
return intro + stringCut(s, maxLength);
}
}
return intro + s;
}
parseOctetString(start, end, maxLength) {
if (this.isASCII(start, end)) {
return stringCut(this.parseStringISO(start, end), maxLength);
}
const len = end - start;
let s = "(" + len + " byte)\n";
maxLength /= 2; // we work in bytes
if (len > maxLength) {
end = start + maxLength;
}
for (let i = start; i < end; ++i) {
s += this.hexByte(this.get(i));
}
if (len > maxLength) {
s += ellipsis;
}
return s;
}
parseOID(start, end, maxLength) {
let s = "";
let n = new Int10();
let bits = 0;
for (let i = start; i < end; ++i) {
const v = this.get(i);
n.mulAdd(128, v & 0x7F);
bits += 7;
if (!(v & 0x80)) { // finished
if (s === "") {
n = n.simplify();
if (n instanceof Int10) {
n.sub(80);
s = "2." + n.toString();
}
else {
const m = n < 80 ? n < 40 ? 0 : 1 : 2;
s = m + "." + (n - m * 40);
}
}
else {
s += "." + n.toString();
}
if (s.length > maxLength) {
return stringCut(s, maxLength);
}
n = new Int10();
bits = 0;
}
}
if (bits > 0) {
s += ".incomplete";
}
return s;
}
}
export class ASN1 {
constructor(stream, header, length, tag, sub) {
if (!(tag instanceof ASN1Tag)) {
throw new Error("Invalid tag value.");
}
this.stream = stream;
this.header = header;
this.length = length;
this.tag = tag;
this.sub = sub;
}
typeName() {
switch (this.tag.tagClass) {
case 0: // universal
switch (this.tag.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";
}
return "Universal_" + this.tag.tagNumber.toString();
case 1:
return "Application_" + this.tag.tagNumber.toString();
case 2:
return "[" + this.tag.tagNumber.toString() + "]"; // Context
case 3:
return "Private_" + this.tag.tagNumber.toString();
}
}
content(maxLength) {
if (this.tag === undefined) {
return null;
}
if (maxLength === undefined) {
maxLength = Infinity;
}
const content = this.posContent();
const len = Math.abs(this.length);
if (!this.tag.isUniversal()) {
if (this.sub !== null) {
return "(" + this.sub.length + " elem)";
}
return this.stream.parseOctetString(content, content + len, maxLength);
}
switch (this.tag.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
return this.sub ? "(" + this.sub.length + " elem)" :
this.stream.parseBitString(content, content + len, maxLength);
case 0x04: // OCTET_STRING
return this.sub ? "(" + this.sub.length + " elem)" :
this.stream.parseOctetString(content, content + len, maxLength);
// case 0x05: // NULL
case 0x06: // OBJECT_IDENTIFIER
return this.stream.parseOID(content, content + len, maxLength);
// case 0x07: // ObjectDescriptor
// case 0x08: // EXTERNAL
// case 0x09: // REAL
// case 0x0A: // ENUMERATED
// case 0x0B: // EMBEDDED_PDV
case 0x10: // SEQUENCE
case 0x11: // SET
if (this.sub !== null) {
return "(" + this.sub.length + " elem)";
}
else {
return "(no elem)";
}
case 0x0C: // UTF8String
return stringCut(this.stream.parseStringUTF(content, content + len), maxLength);
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
return stringCut(this.stream.parseStringISO(content, content + len), maxLength);
case 0x1E: // BMPString
return stringCut(this.stream.parseStringBMP(content, content + len), maxLength);
case 0x17: // UTCTime
case 0x18: // GeneralizedTime
return this.stream.parseTime(content, content + len, (this.tag.tagNumber == 0x17));
}
return null;
}
toString() {
return this.typeName() + "@" + this.stream.pos + "[header:" + this.header + ",length:" + this.length + ",sub:" + ((this.sub === null) ? "null" : this.sub.length) + "]";
}
toPrettyString(indent) {
if (indent === undefined) {
indent = "";
}
let s = indent + this.typeName() + " @" + this.stream.pos;
if (this.length >= 0) {
s += "+";
}
s += this.length;
if (this.tag.tagConstructed) {
s += " (constructed)";
}
else if ((this.tag.isUniversal() && ((this.tag.tagNumber == 0x03) || (this.tag.tagNumber == 0x04))) && (this.sub !== null)) {
s += " (encapsulates)";
}
s += "\n";
if (this.sub !== null) {
indent += " ";
for (let i = 0, max = this.sub.length; i < max; ++i) {
s += this.sub[i].toPrettyString(indent);
}
}
return s;
}
posStart() {
return this.stream.pos;
}
posContent() {
return this.stream.pos + this.header;
}
posEnd() {
return this.stream.pos + this.header + Math.abs(this.length);
}
toHexString() {
return this.stream.hexDump(this.posStart(), this.posEnd(), true);
}
static decodeLength(stream) {
let buf = stream.get();
const len = buf & 0x7F;
if (len == buf) {
return len;
}
// no reason to use Int10, as it would be a huge buffer anyways
if (len > 6) {
throw new Error("Length over 48 bits not supported at position " + (stream.pos - 1));
}
if (len === 0) {
return null;
} // undefined
buf = 0;
for (let i = 0; i < len; ++i) {
buf = (buf * 256) + stream.get();
}
return buf;
}
/**
* Retrieve the hexadecimal value (as a string) of the current ASN.1 element
* @returns {string}
* @public
*/
getHexStringValue() {
const hexString = this.toHexString();
const offset = this.header * 2;
const length = this.length * 2;
return hexString.substr(offset, length);
}
static decode(str) {
let stream;
if (!(str instanceof Stream)) {
stream = new Stream(str, 0);
}
else {
stream = str;
}
const streamStart = new Stream(stream);
const tag = new ASN1Tag(stream);
let len = ASN1.decodeLength(stream);
const start = stream.pos;
const header = start - streamStart.pos;
let sub = null;
const getSub = function () {
const ret = [];
if (len !== null) {
// definite length
const end = start + len;
while (stream.pos < end) {
ret[ret.length] = ASN1.decode(stream);
}
if (stream.pos != end) {
throw new Error("Content size is not correct for container starting at offset " + start);
}
}
else {
// undefined length
try {
for (;;) {
const s = ASN1.decode(stream);
if (s.tag.isEOC()) {
break;
}
ret[ret.length] = s;
}
len = start - stream.pos; // undefined lengths are represented as negative values
}
catch (e) {
throw new Error("Exception while decoding undefined length content: " + e);
}
}
return ret;
};
if (tag.tagConstructed) {
// must have valid content
sub = getSub();
}
else if (tag.isUniversal() && ((tag.tagNumber == 0x03) || (tag.tagNumber == 0x04))) {
// sometimes BitString and OctetString are used to encapsulate ASN.1
try {
if (tag.tagNumber == 0x03) {
if (stream.get() != 0) {
throw new Error("BIT STRINGs with unused bits cannot encapsulate.");
}
}
sub = getSub();
for (let i = 0; i < sub.length; ++i) {
if (sub[i].tag.isEOC()) {
throw new Error("EOC is not supposed to be actual content.");
}
}
}
catch (e) {
// but silently ignore when they don't
sub = null;
}
}
if (sub === null) {
if (len === null) {
throw new Error("We can't skip over an invalid tag with undefined length at offset " + start);
}
stream.pos = start + Math.abs(len);
}
return new ASN1(streamStart, header, len, tag, sub);
}
}
export class ASN1Tag {
constructor(stream) {
let buf = stream.get();
this.tagClass = buf >> 6;
this.tagConstructed = ((buf & 0x20) !== 0);
this.tagNumber = buf & 0x1F;
if (this.tagNumber == 0x1F) { // long tag
const n = new Int10();
do {
buf = stream.get();
n.mulAdd(128, buf & 0x7F);
} while (buf & 0x80);
this.tagNumber = n.simplify();
}
}
isUniversal() {
return this.tagClass === 0x00;
}
isEOC() {
return this.tagClass === 0x00 && this.tagNumber === 0x00;
}
}