This commit is contained in:
eric sciple 2020-01-24 12:30:26 -05:00
parent 00c3b50fca
commit ae5dcb46c8
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Copyright (c) 2011 Mark Cavage, All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE

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node-asn1 is a library for encoding and decoding ASN.1 datatypes in pure JS.
Currently BER encoding is supported; at some point I'll likely have to do DER.
## Usage
Mostly, if you're *actually* needing to read and write ASN.1, you probably don't
need this readme to explain what and why. If you have no idea what ASN.1 is,
see this: ftp://ftp.rsa.com/pub/pkcs/ascii/layman.asc
The source is pretty much self-explanatory, and has read/write methods for the
common types out there.
### Decoding
The following reads an ASN.1 sequence with a boolean.
var Ber = require('asn1').Ber;
var reader = new Ber.Reader(Buffer.from([0x30, 0x03, 0x01, 0x01, 0xff]));
reader.readSequence();
console.log('Sequence len: ' + reader.length);
if (reader.peek() === Ber.Boolean)
console.log(reader.readBoolean());
### Encoding
The following generates the same payload as above.
var Ber = require('asn1').Ber;
var writer = new Ber.Writer();
writer.startSequence();
writer.writeBoolean(true);
writer.endSequence();
console.log(writer.buffer);
## Installation
npm install asn1
## License
MIT.
## Bugs
See <https://github.com/joyent/node-asn1/issues>.

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// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
module.exports = {
newInvalidAsn1Error: function (msg) {
var e = new Error();
e.name = 'InvalidAsn1Error';
e.message = msg || '';
return e;
}
};

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// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
var errors = require('./errors');
var types = require('./types');
var Reader = require('./reader');
var Writer = require('./writer');
// --- Exports
module.exports = {
Reader: Reader,
Writer: Writer
};
for (var t in types) {
if (types.hasOwnProperty(t))
module.exports[t] = types[t];
}
for (var e in errors) {
if (errors.hasOwnProperty(e))
module.exports[e] = errors[e];
}

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// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
var assert = require('assert');
var Buffer = require('safer-buffer').Buffer;
var ASN1 = require('./types');
var errors = require('./errors');
// --- Globals
var newInvalidAsn1Error = errors.newInvalidAsn1Error;
// --- API
function Reader(data) {
if (!data || !Buffer.isBuffer(data))
throw new TypeError('data must be a node Buffer');
this._buf = data;
this._size = data.length;
// These hold the "current" state
this._len = 0;
this._offset = 0;
}
Object.defineProperty(Reader.prototype, 'length', {
enumerable: true,
get: function () { return (this._len); }
});
Object.defineProperty(Reader.prototype, 'offset', {
enumerable: true,
get: function () { return (this._offset); }
});
Object.defineProperty(Reader.prototype, 'remain', {
get: function () { return (this._size - this._offset); }
});
Object.defineProperty(Reader.prototype, 'buffer', {
get: function () { return (this._buf.slice(this._offset)); }
});
/**
* Reads a single byte and advances offset; you can pass in `true` to make this
* a "peek" operation (i.e., get the byte, but don't advance the offset).
*
* @param {Boolean} peek true means don't move offset.
* @return {Number} the next byte, null if not enough data.
*/
Reader.prototype.readByte = function (peek) {
if (this._size - this._offset < 1)
return null;
var b = this._buf[this._offset] & 0xff;
if (!peek)
this._offset += 1;
return b;
};
Reader.prototype.peek = function () {
return this.readByte(true);
};
/**
* Reads a (potentially) variable length off the BER buffer. This call is
* not really meant to be called directly, as callers have to manipulate
* the internal buffer afterwards.
*
* As a result of this call, you can call `Reader.length`, until the
* next thing called that does a readLength.
*
* @return {Number} the amount of offset to advance the buffer.
* @throws {InvalidAsn1Error} on bad ASN.1
*/
Reader.prototype.readLength = function (offset) {
if (offset === undefined)
offset = this._offset;
if (offset >= this._size)
return null;
var lenB = this._buf[offset++] & 0xff;
if (lenB === null)
return null;
if ((lenB & 0x80) === 0x80) {
lenB &= 0x7f;
if (lenB === 0)
throw newInvalidAsn1Error('Indefinite length not supported');
if (lenB > 4)
throw newInvalidAsn1Error('encoding too long');
if (this._size - offset < lenB)
return null;
this._len = 0;
for (var i = 0; i < lenB; i++)
this._len = (this._len << 8) + (this._buf[offset++] & 0xff);
} else {
// Wasn't a variable length
this._len = lenB;
}
return offset;
};
/**
* Parses the next sequence in this BER buffer.
*
* To get the length of the sequence, call `Reader.length`.
*
* @return {Number} the sequence's tag.
*/
Reader.prototype.readSequence = function (tag) {
var seq = this.peek();
if (seq === null)
return null;
if (tag !== undefined && tag !== seq)
throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) +
': got 0x' + seq.toString(16));
var o = this.readLength(this._offset + 1); // stored in `length`
if (o === null)
return null;
this._offset = o;
return seq;
};
Reader.prototype.readInt = function () {
return this._readTag(ASN1.Integer);
};
Reader.prototype.readBoolean = function () {
return (this._readTag(ASN1.Boolean) === 0 ? false : true);
};
Reader.prototype.readEnumeration = function () {
return this._readTag(ASN1.Enumeration);
};
Reader.prototype.readString = function (tag, retbuf) {
if (!tag)
tag = ASN1.OctetString;
var b = this.peek();
if (b === null)
return null;
if (b !== tag)
throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) +
': got 0x' + b.toString(16));
var o = this.readLength(this._offset + 1); // stored in `length`
if (o === null)
return null;
if (this.length > this._size - o)
return null;
this._offset = o;
if (this.length === 0)
return retbuf ? Buffer.alloc(0) : '';
var str = this._buf.slice(this._offset, this._offset + this.length);
this._offset += this.length;
return retbuf ? str : str.toString('utf8');
};
Reader.prototype.readOID = function (tag) {
if (!tag)
tag = ASN1.OID;
var b = this.readString(tag, true);
if (b === null)
return null;
var values = [];
var value = 0;
for (var i = 0; i < b.length; i++) {
var byte = b[i] & 0xff;
value <<= 7;
value += byte & 0x7f;
if ((byte & 0x80) === 0) {
values.push(value);
value = 0;
}
}
value = values.shift();
values.unshift(value % 40);
values.unshift((value / 40) >> 0);
return values.join('.');
};
Reader.prototype._readTag = function (tag) {
assert.ok(tag !== undefined);
var b = this.peek();
if (b === null)
return null;
if (b !== tag)
throw newInvalidAsn1Error('Expected 0x' + tag.toString(16) +
': got 0x' + b.toString(16));
var o = this.readLength(this._offset + 1); // stored in `length`
if (o === null)
return null;
if (this.length > 4)
throw newInvalidAsn1Error('Integer too long: ' + this.length);
if (this.length > this._size - o)
return null;
this._offset = o;
var fb = this._buf[this._offset];
var value = 0;
for (var i = 0; i < this.length; i++) {
value <<= 8;
value |= (this._buf[this._offset++] & 0xff);
}
if ((fb & 0x80) === 0x80 && i !== 4)
value -= (1 << (i * 8));
return value >> 0;
};
// --- Exported API
module.exports = Reader;

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// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
module.exports = {
EOC: 0,
Boolean: 1,
Integer: 2,
BitString: 3,
OctetString: 4,
Null: 5,
OID: 6,
ObjectDescriptor: 7,
External: 8,
Real: 9, // float
Enumeration: 10,
PDV: 11,
Utf8String: 12,
RelativeOID: 13,
Sequence: 16,
Set: 17,
NumericString: 18,
PrintableString: 19,
T61String: 20,
VideotexString: 21,
IA5String: 22,
UTCTime: 23,
GeneralizedTime: 24,
GraphicString: 25,
VisibleString: 26,
GeneralString: 28,
UniversalString: 29,
CharacterString: 30,
BMPString: 31,
Constructor: 32,
Context: 128
};

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// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
var assert = require('assert');
var Buffer = require('safer-buffer').Buffer;
var ASN1 = require('./types');
var errors = require('./errors');
// --- Globals
var newInvalidAsn1Error = errors.newInvalidAsn1Error;
var DEFAULT_OPTS = {
size: 1024,
growthFactor: 8
};
// --- Helpers
function merge(from, to) {
assert.ok(from);
assert.equal(typeof (from), 'object');
assert.ok(to);
assert.equal(typeof (to), 'object');
var keys = Object.getOwnPropertyNames(from);
keys.forEach(function (key) {
if (to[key])
return;
var value = Object.getOwnPropertyDescriptor(from, key);
Object.defineProperty(to, key, value);
});
return to;
}
// --- API
function Writer(options) {
options = merge(DEFAULT_OPTS, options || {});
this._buf = Buffer.alloc(options.size || 1024);
this._size = this._buf.length;
this._offset = 0;
this._options = options;
// A list of offsets in the buffer where we need to insert
// sequence tag/len pairs.
this._seq = [];
}
Object.defineProperty(Writer.prototype, 'buffer', {
get: function () {
if (this._seq.length)
throw newInvalidAsn1Error(this._seq.length + ' unended sequence(s)');
return (this._buf.slice(0, this._offset));
}
});
Writer.prototype.writeByte = function (b) {
if (typeof (b) !== 'number')
throw new TypeError('argument must be a Number');
this._ensure(1);
this._buf[this._offset++] = b;
};
Writer.prototype.writeInt = function (i, tag) {
if (typeof (i) !== 'number')
throw new TypeError('argument must be a Number');
if (typeof (tag) !== 'number')
tag = ASN1.Integer;
var sz = 4;
while ((((i & 0xff800000) === 0) || ((i & 0xff800000) === 0xff800000 >> 0)) &&
(sz > 1)) {
sz--;
i <<= 8;
}
if (sz > 4)
throw newInvalidAsn1Error('BER ints cannot be > 0xffffffff');
this._ensure(2 + sz);
this._buf[this._offset++] = tag;
this._buf[this._offset++] = sz;
while (sz-- > 0) {
this._buf[this._offset++] = ((i & 0xff000000) >>> 24);
i <<= 8;
}
};
Writer.prototype.writeNull = function () {
this.writeByte(ASN1.Null);
this.writeByte(0x00);
};
Writer.prototype.writeEnumeration = function (i, tag) {
if (typeof (i) !== 'number')
throw new TypeError('argument must be a Number');
if (typeof (tag) !== 'number')
tag = ASN1.Enumeration;
return this.writeInt(i, tag);
};
Writer.prototype.writeBoolean = function (b, tag) {
if (typeof (b) !== 'boolean')
throw new TypeError('argument must be a Boolean');
if (typeof (tag) !== 'number')
tag = ASN1.Boolean;
this._ensure(3);
this._buf[this._offset++] = tag;
this._buf[this._offset++] = 0x01;
this._buf[this._offset++] = b ? 0xff : 0x00;
};
Writer.prototype.writeString = function (s, tag) {
if (typeof (s) !== 'string')
throw new TypeError('argument must be a string (was: ' + typeof (s) + ')');
if (typeof (tag) !== 'number')
tag = ASN1.OctetString;
var len = Buffer.byteLength(s);
this.writeByte(tag);
this.writeLength(len);
if (len) {
this._ensure(len);
this._buf.write(s, this._offset);
this._offset += len;
}
};
Writer.prototype.writeBuffer = function (buf, tag) {
if (typeof (tag) !== 'number')
throw new TypeError('tag must be a number');
if (!Buffer.isBuffer(buf))
throw new TypeError('argument must be a buffer');
this.writeByte(tag);
this.writeLength(buf.length);
this._ensure(buf.length);
buf.copy(this._buf, this._offset, 0, buf.length);
this._offset += buf.length;
};
Writer.prototype.writeStringArray = function (strings) {
if ((!strings instanceof Array))
throw new TypeError('argument must be an Array[String]');
var self = this;
strings.forEach(function (s) {
self.writeString(s);
});
};
// This is really to solve DER cases, but whatever for now
Writer.prototype.writeOID = function (s, tag) {
if (typeof (s) !== 'string')
throw new TypeError('argument must be a string');
if (typeof (tag) !== 'number')
tag = ASN1.OID;
if (!/^([0-9]+\.){3,}[0-9]+$/.test(s))
throw new Error('argument is not a valid OID string');
function encodeOctet(bytes, octet) {
if (octet < 128) {
bytes.push(octet);
} else if (octet < 16384) {
bytes.push((octet >>> 7) | 0x80);
bytes.push(octet & 0x7F);
} else if (octet < 2097152) {
bytes.push((octet >>> 14) | 0x80);
bytes.push(((octet >>> 7) | 0x80) & 0xFF);
bytes.push(octet & 0x7F);
} else if (octet < 268435456) {
bytes.push((octet >>> 21) | 0x80);
bytes.push(((octet >>> 14) | 0x80) & 0xFF);
bytes.push(((octet >>> 7) | 0x80) & 0xFF);
bytes.push(octet & 0x7F);
} else {
bytes.push(((octet >>> 28) | 0x80) & 0xFF);
bytes.push(((octet >>> 21) | 0x80) & 0xFF);
bytes.push(((octet >>> 14) | 0x80) & 0xFF);
bytes.push(((octet >>> 7) | 0x80) & 0xFF);
bytes.push(octet & 0x7F);
}
}
var tmp = s.split('.');
var bytes = [];
bytes.push(parseInt(tmp[0], 10) * 40 + parseInt(tmp[1], 10));
tmp.slice(2).forEach(function (b) {
encodeOctet(bytes, parseInt(b, 10));
});
var self = this;
this._ensure(2 + bytes.length);
this.writeByte(tag);
this.writeLength(bytes.length);
bytes.forEach(function (b) {
self.writeByte(b);
});
};
Writer.prototype.writeLength = function (len) {
if (typeof (len) !== 'number')
throw new TypeError('argument must be a Number');
this._ensure(4);
if (len <= 0x7f) {
this._buf[this._offset++] = len;
} else if (len <= 0xff) {
this._buf[this._offset++] = 0x81;
this._buf[this._offset++] = len;
} else if (len <= 0xffff) {
this._buf[this._offset++] = 0x82;
this._buf[this._offset++] = len >> 8;
this._buf[this._offset++] = len;
} else if (len <= 0xffffff) {
this._buf[this._offset++] = 0x83;
this._buf[this._offset++] = len >> 16;
this._buf[this._offset++] = len >> 8;
this._buf[this._offset++] = len;
} else {
throw newInvalidAsn1Error('Length too long (> 4 bytes)');
}
};
Writer.prototype.startSequence = function (tag) {
if (typeof (tag) !== 'number')
tag = ASN1.Sequence | ASN1.Constructor;
this.writeByte(tag);
this._seq.push(this._offset);
this._ensure(3);
this._offset += 3;
};
Writer.prototype.endSequence = function () {
var seq = this._seq.pop();
var start = seq + 3;
var len = this._offset - start;
if (len <= 0x7f) {
this._shift(start, len, -2);
this._buf[seq] = len;
} else if (len <= 0xff) {
this._shift(start, len, -1);
this._buf[seq] = 0x81;
this._buf[seq + 1] = len;
} else if (len <= 0xffff) {
this._buf[seq] = 0x82;
this._buf[seq + 1] = len >> 8;
this._buf[seq + 2] = len;
} else if (len <= 0xffffff) {
this._shift(start, len, 1);
this._buf[seq] = 0x83;
this._buf[seq + 1] = len >> 16;
this._buf[seq + 2] = len >> 8;
this._buf[seq + 3] = len;
} else {
throw newInvalidAsn1Error('Sequence too long');
}
};
Writer.prototype._shift = function (start, len, shift) {
assert.ok(start !== undefined);
assert.ok(len !== undefined);
assert.ok(shift);
this._buf.copy(this._buf, start + shift, start, start + len);
this._offset += shift;
};
Writer.prototype._ensure = function (len) {
assert.ok(len);
if (this._size - this._offset < len) {
var sz = this._size * this._options.growthFactor;
if (sz - this._offset < len)
sz += len;
var buf = Buffer.alloc(sz);
this._buf.copy(buf, 0, 0, this._offset);
this._buf = buf;
this._size = sz;
}
};
// --- Exported API
module.exports = Writer;

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// Copyright 2011 Mark Cavage <mcavage@gmail.com> All rights reserved.
// If you have no idea what ASN.1 or BER is, see this:
// ftp://ftp.rsa.com/pub/pkcs/ascii/layman.asc
var Ber = require('./ber/index');
// --- Exported API
module.exports = {
Ber: Ber,
BerReader: Ber.Reader,
BerWriter: Ber.Writer
};

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{
"author": "Joyent (joyent.com)",
"contributors": [
"Mark Cavage <mcavage@gmail.com>",
"David Gwynne <loki@animata.net>",
"Yunong Xiao <yunong@joyent.com>",
"Alex Wilson <alex.wilson@joyent.com>"
],
"name": "asn1",
"description": "Contains parsers and serializers for ASN.1 (currently BER only)",
"version": "0.2.4",
"repository": {
"type": "git",
"url": "git://github.com/joyent/node-asn1.git"
},
"main": "lib/index.js",
"dependencies": {
"safer-buffer": "~2.1.0"
},
"devDependencies": {
"istanbul": "^0.3.6",
"faucet": "0.0.1",
"tape": "^3.5.0",
"eslint": "2.13.1",
"eslint-plugin-joyent": "~1.3.0"
},
"scripts": {
"test": "./node_modules/.bin/tape ./test/ber/*.test.js"
},
"license": "MIT"
,"_resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz"
,"_integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg=="
,"_from": "asn1@0.2.4"
}