GOST 28147-89 cypher in JavaScript

I'd like to indroduce you my implementation of GOST 28147-89 cypher also known as Magma in JavaScript.

This cypher is used in "Carrdex IMS", an Access Contol System produced by Carddex LLC, to verify and protect identification data of MIFARE proximity cards.

My implementation is pretty small in size, but has support of Cipher Feedback Mode. Its overall 100 lines of source code and has no dependencies.

Below follows an example of how you can use it.

	var GOST_28147 = require('./index')
	const _MeshingKeys_8i32 = [
	0x97c8c203, 0x6d99ee04, 0x9e7136db, 0x4a07c0c3,
	0x31a11d29, 0xeccd7d4e, 0xc0fd6a8f, 0x02be4a45
	];
	const _SubstitutionBoxes = [
	[ 4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3 ],
	[ 14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9 ],
	[ 5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11 ],
	[ 7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3 ],
	[ 6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2 ],
	[ 4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14 ],
	[ 13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12 ],
	[ 1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12 ]
	]
	var gamma = new Buffer([
	0x40, 0xE0, 0x3C, 0x7E,
	0xB3, 0x29, 0x86, 0x6C,
	])
	var msg = new Buffer([
	0x01, 0x02, 0x03, 0x04,
	0x01, 0x02, 0x03, 0x04,
	])
	var eng = new GOST_28147(_MeshingKeys_8i32, _SubstitutionBoxes);
	eng.setGamma(gamma.readUInt32LE(0), gamma.readUInt32LE(4))
	eng.execute_gammingMode(8/4, msg, true);
	console.log('cypher:', msg)
	eng.setGamma(gamma.readUInt32LE(0), gamma.readUInt32LE(4))
	eng.execute_gammingMode(8/4, msg, true);
	console.log('original:', msg)

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