This repository should be a 1:1 mirror of the original repository but build ES5-compatible files for obscure business reasons.
To use it, install from the git repository using npm install https://github.com/KeeeX/ASN1.js.git#releases.
The releases branch contain the built files and should work as a drop-in replacement when needed.
Abstract Syntax Notation One (ASN.1) is a standard and notation that describes rules and structures for representing, encoding, transmitting, and decoding data in telecommunications and computer networking. ASN1js is a pure JavaScript library implementing this standard. ASN.1 is the basis of all X.509 related data structures and numerous other protocols used on the web.
ASN1.js V2 (ES2015 version) is incompatible with ASN1.js V1 code.
ASN1js is the first library for BER encoding/decoding in Javascript designed for browser use. BER is the basic encoding rules for ASN.1 that all others are based on, DER is the encoding rules used by PKI applications - it is a subset of BER. The ASN1js library was tested against freely available ASN.1:2008 test suite, with some limitations related to JavaScript language.
- Based on latest features of JavaScipt language from ES2015 standard;
- ASN1js is a "base layer" for full-featured JS library PKIjs, which is using Web Cryptography API and has all classes, neccessary to work with PKI-related data;
- Fully object-oriented library. Inhiritence is using everywhere inside the lib;
- Working with HTML5 data objects (ArrayBuffer, Uint8Array etc.);
- Working with all ASN.1:2008 types;
- Working with BER encoded data;
- All types inside the library constantly stores information about all ASN.1 sub blocks (tag block, length block or value block);
- User may have access to any byte inside any ASN.1 sub-block;
- Any sub-block may have unlimited length, as it described in ASN.1 standard (even "tag block");
- Ability to work with ASN.1 string date types (intcluding all "international" strings like UniversalString, BMPString, UTF8String) by passing native JavaScript strings into constuctors. And vice versa - all initially parsed data of ASN.1 string types right after decoding automatically converts into native JavaScript strings;
- Same with ASN.1 date-time types: for major types like UTCTime and GeneralizedTime there are automatic convertion between "JS date type - ASN.1 date-time type" + vice versa;
- Same with ASN.1 OBJECT-IDENTIFIER (OID) data-type: you can initialize OID by JavaScript string and can get string representation via calling "oid.valueBlock.toString()";
- Working with "easy-to-understand" ASN.1 schemas (pre-defined or built by user);
- Has special types to work with ASN.1 schemas:
- Any
- Choice
- Repeated
- User can name any block inside ASN.1 schema and easily get information by name;
- Ability to parse internal data inside a primitively encoded data types and automatically validate it against special schema;
- All types inside library are dynamic;
- All types can be initialized in static or dynamic ways.
- ASN1js fully tested against ASN.1:2008 TestSuite.
//region How to create new ASN. structures
var sequence = new asn1js.Sequence();
sequence.valueBlock.value.push(new asn1js.Integer({ value: 1 }));
var sequence_buffer = sequence.toBER(false); // Encode current sequence to BER (in ArrayBuffer)
var current_size = sequence_buffer.byteLength;
var integer_data = new ArrayBuffer(8);
var integer_view = new Uint8Array(integer_data);
integer_view[0] = 0x01;
integer_view[1] = 0x01;
integer_view[2] = 0x01;
integer_view[3] = 0x01;
integer_view[4] = 0x01;
integer_view[5] = 0x01;
integer_view[6] = 0x01;
integer_view[7] = 0x01;
sequence.valueBlock.value.push(new asn1js.Integer({
isHexOnly: true,
valueHex: integer_data
})); // Put too long for decoding Integer value
sequence_buffer = sequence.toBER(false);
current_size = sequence_buffer.byteLength;
//endregion //region How to create new ASN.1 structures by calling constuctors with parameters
var sequence2 = new asn1js.Sequence({
value: [
new asn1js.Integer({ value: 1 }),
new asn1js.Integer({
isHexOnly: true,
valueHex: integer_data
}),
]
});
//endregion //region How to validate ASN.1 against pre-defined schema
var asn1_schema = new asn1js.Sequence({
name: "block1",
value: [
new asn1js.Null({
name: "block2"
}),
new asn1js.Integer({
name: "block3",
optional: true // This block is absent inside data, but it's "optional". Hence verification against the schema will be passed.
})
]
});
//endregion
var variant1 = org.pkijs.verifySchema(encoded_sequence, asn1_schema); // Verify schema together with decoding of raw data
var variant1_verified = variant1.verified;
var variant1_result = variant1.result; // Verified decoded data with all block names inside //region How to use "internal schemas" for primitevely encoded data types
var primitive_octetstring = new asn1js.OctetString({ valueHex: encoded_sequence }); // Create a primitively encoded OctetString where internal data is an encoded Sequence
var asn1_schema_internal = new asn1js.OctetString({
name: "outer_block",
primitiveSchema: new asn1js.Sequence({
name: "block1",
value: [
new asn1js.Null({
name: "block2"
})
]
})
});
var variant6 = org.pkijs.compareSchema(primitive_octetstring, primitive_octetstring, asn1_schema_internal);
var variant6_verified = variant4.verified;
var variant6_block1_tag_num = variant6.result.block1.idBlock.tagNumber;
var variant6_block2_tag_num = variant6.result.block2.idBlock.tagNumber;
//endregion More examples could be found in "examples" directory or inside PKIjs library.
- C++ ASN1:2008 BER coder/decoder - the "father" of ASN1js project;
- Freely available ASN.1:2008 test suite - the suite which can help you to validate (and better understand) any ASN.1 coder/decoder;
- NPM package for ASN.1:2008 test suite
There are several commercial products, enterprise solitions as well as open source project based on versions of ASN1js. You should, however, do your own code and security review before utilization in a production application before utilizing any open source library to ensure it will meet your needs.
Copyright (c) 2014, GMO GlobalSign Copyright (c) 2015-2018, Peculiar Ventures All rights reserved.
Author 2014-2018, Yury Strozhevsky.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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