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'use strict';
const inherits = require('inherits');
const Buffer = require('safer-buffer').Buffer;
const Node = require('../base/node');
// Import DER constants
const der = require('../constants/der');
function DEREncoder(entity) {
this.enc = 'der';
this.name = entity.name;
this.entity = entity;
// Construct base tree
this.tree = new DERNode();
this.tree._init(entity.body);
}
module.exports = DEREncoder;
DEREncoder.prototype.encode = function encode(data, reporter) {
return this.tree._encode(data, reporter).join();
};
// Tree methods
function DERNode(parent) {
Node.call(this, 'der', parent);
}
inherits(DERNode, Node);
DERNode.prototype._encodeComposite = function encodeComposite(tag,
primitive,
cls,
content) {
const encodedTag = encodeTag(tag, primitive, cls, this.reporter);
// Short form
if (content.length < 0x80) {
const header = Buffer.alloc(2);
header[0] = encodedTag;
header[1] = content.length;
return this._createEncoderBuffer([ header, content ]);
}
// Long form
// Count octets required to store length
let lenOctets = 1;
for (let i = content.length; i >= 0x100; i >>= 8)
lenOctets++;
const header = Buffer.alloc(1 + 1 + lenOctets);
header[0] = encodedTag;
header[1] = 0x80 | lenOctets;
for (let i = 1 + lenOctets, j = content.length; j > 0; i--, j >>= 8)
header[i] = j & 0xff;
return this._createEncoderBuffer([ header, content ]);
};
DERNode.prototype._encodeStr = function encodeStr(str, tag) {
if (tag === 'bitstr') {
return this._createEncoderBuffer([ str.unused | 0, str.data ]);
} else if (tag === 'bmpstr') {
const buf = Buffer.alloc(str.length * 2);
for (let i = 0; i < str.length; i++) {
buf.writeUInt16BE(str.charCodeAt(i), i * 2);
}
return this._createEncoderBuffer(buf);
} else if (tag === 'numstr') {
if (!this._isNumstr(str)) {
return this.reporter.error('Encoding of string type: numstr supports ' +
'only digits and space');
}
return this._createEncoderBuffer(str);
} else if (tag === 'printstr') {
if (!this._isPrintstr(str)) {
return this.reporter.error('Encoding of string type: printstr supports ' +
'only latin upper and lower case letters, ' +
'digits, space, apostrophe, left and rigth ' +
'parenthesis, plus sign, comma, hyphen, ' +
'dot, slash, colon, equal sign, ' +
'question mark');
}
return this._createEncoderBuffer(str);
} else if (/str$/.test(tag)) {
return this._createEncoderBuffer(str);
} else if (tag === 'objDesc') {
return this._createEncoderBuffer(str);
} else {
return this.reporter.error('Encoding of string type: ' + tag +
' unsupported');
}
};
DERNode.prototype._encodeObjid = function encodeObjid(id, values, relative) {
if (typeof id === 'string') {
if (!values)
return this.reporter.error('string objid given, but no values map found');
if (!values.hasOwnProperty(id))
return this.reporter.error('objid not found in values map');
id = values[id].split(/[\s.]+/g);
for (let i = 0; i < id.length; i++)
id[i] |= 0;
} else if (Array.isArray(id)) {
id = id.slice();
for (let i = 0; i < id.length; i++)
id[i] |= 0;
}
if (!Array.isArray(id)) {
return this.reporter.error('objid() should be either array or string, ' +
'got: ' + JSON.stringify(id));
}
if (!relative) {
if (id[1] >= 40)
return this.reporter.error('Second objid identifier OOB');
id.splice(0, 2, id[0] * 40 + id[1]);
}
// Count number of octets
let size = 0;
for (let i = 0; i < id.length; i++) {
let ident = id[i];
for (size++; ident >= 0x80; ident >>= 7)
size++;
}
const objid = Buffer.alloc(size);
let offset = objid.length - 1;
for (let i = id.length - 1; i >= 0; i--) {
let ident = id[i];
objid[offset--] = ident & 0x7f;
while ((ident >>= 7) > 0)
objid[offset--] = 0x80 | (ident & 0x7f);
}
return this._createEncoderBuffer(objid);
};
function two(num) {
if (num < 10)
return '0' + num;
else
return num;
}
DERNode.prototype._encodeTime = function encodeTime(time, tag) {
let str;
const date = new Date(time);
if (tag === 'gentime') {
str = [
two(date.getUTCFullYear()),
two(date.getUTCMonth() + 1),
two(date.getUTCDate()),
two(date.getUTCHours()),
two(date.getUTCMinutes()),
two(date.getUTCSeconds()),
'Z'
].join('');
} else if (tag === 'utctime') {
str = [
two(date.getUTCFullYear() % 100),
two(date.getUTCMonth() + 1),
two(date.getUTCDate()),
two(date.getUTCHours()),
two(date.getUTCMinutes()),
two(date.getUTCSeconds()),
'Z'
].join('');
} else {
this.reporter.error('Encoding ' + tag + ' time is not supported yet');
}
return this._encodeStr(str, 'octstr');
};
DERNode.prototype._encodeNull = function encodeNull() {
return this._createEncoderBuffer('');
};
DERNode.prototype._encodeInt = function encodeInt(num, values) {
if (typeof num === 'string') {
if (!values)
return this.reporter.error('String int or enum given, but no values map');
if (!values.hasOwnProperty(num)) {
return this.reporter.error('Values map doesn\'t contain: ' +
JSON.stringify(num));
}
num = values[num];
}
// Bignum, assume big endian
if (typeof num !== 'number' && !Buffer.isBuffer(num)) {
const numArray = num.toArray();
if (!num.sign && numArray[0] & 0x80) {
numArray.unshift(0);
}
num = Buffer.from(numArray);
}
if (Buffer.isBuffer(num)) {
let size = num.length;
if (num.length === 0)
size++;
const out = Buffer.alloc(size);
num.copy(out);
if (num.length === 0)
out[0] = 0;
return this._createEncoderBuffer(out);
}
if (num < 0x80)
return this._createEncoderBuffer(num);
if (num < 0x100)
return this._createEncoderBuffer([0, num]);
let size = 1;
for (let i = num; i >= 0x100; i >>= 8)
size++;
const out = new Array(size);
for (let i = out.length - 1; i >= 0; i--) {
out[i] = num & 0xff;
num >>= 8;
}
if(out[0] & 0x80) {
out.unshift(0);
}
return this._createEncoderBuffer(Buffer.from(out));
};
DERNode.prototype._encodeBool = function encodeBool(value) {
return this._createEncoderBuffer(value ? 0xff : 0);
};
DERNode.prototype._use = function use(entity, obj) {
if (typeof entity === 'function')
entity = entity(obj);
return entity._getEncoder('der').tree;
};
DERNode.prototype._skipDefault = function skipDefault(dataBuffer, reporter, parent) {
const state = this._baseState;
let i;
if (state['default'] === null)
return false;
const data = dataBuffer.join();
if (state.defaultBuffer === undefined)
state.defaultBuffer = this._encodeValue(state['default'], reporter, parent).join();
if (data.length !== state.defaultBuffer.length)
return false;
for (i=0; i < data.length; i++)
if (data[i] !== state.defaultBuffer[i])
return false;
return true;
};
// Utility methods
function encodeTag(tag, primitive, cls, reporter) {
let res;
if (tag === 'seqof')
tag = 'seq';
else if (tag === 'setof')
tag = 'set';
if (der.tagByName.hasOwnProperty(tag))
res = der.tagByName[tag];
else if (typeof tag === 'number' && (tag | 0) === tag)
res = tag;
else
return reporter.error('Unknown tag: ' + tag);
if (res >= 0x1f)
return reporter.error('Multi-octet tag encoding unsupported');
if (!primitive)
res |= 0x20;
res |= (der.tagClassByName[cls || 'universal'] << 6);
return res;
}