EMV QRCPS Parser/Encoder

emv_qrcps_encoder.js

const crc_table = [
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5,
0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b,
0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c,
0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,
0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b,
0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6,
0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738,
0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5,
0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969,
0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96,
0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc,
0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03,
0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd,
0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6,
0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb,
0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1,
0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c,
0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2,
0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb,
0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447,
0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8,
0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2,
0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9,
0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827,
0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c,
0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0,
0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d,
0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07,
0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba,
0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
]

function CRCCCITT(data, seed=0xffff, final=0) {
	let crc = seed;
	let temp;

	for (let i = 0; i < data.length; i++) {
		temp = (data[i] ^ (crc >> 8)) & 0xff;
		crc = crc_table[temp] ^ (crc << 8);
	}

	return (crc ^ final) & 0xFFFF;
} 

function encode(data, root=true) {
	let result = ''
	for (const [key, raw_value] of Object.entries(data)) {
		const value = typeof(raw_value) === 'string'
		            ? raw_value
		            : encode(raw_value, false)
		result += key.slice(3) + value.length.toString().padStart(2, 0) + value
	}

	if (root) {
		result += '6304'
		const bytes = new TextEncoder().encode(result)
		const crc = CRCCCITT(bytes)
		result += crc.toString(16).toUpperCase().padStart(4, 0)
	}

	return result
}

emv_qrcps_parser.js

const root_template = {
	"00": {
		name: 'format',
		parse: input => input === '01' ? 'v1' : `unknown_version:${input}`
	},
	"62": {
		name: "additional_data",
		parse: input => parse_emv_qrcps(input, additional_data_template)
	},
}

for (let i = 26; i <= 51; i++) {
	root_template[i] = {
		name: `merchant_info:${i}`,
		parse: input => parse_emv_qrcps(input, merchant_account_information_template)
	}
}

for (let i = 80; i <= 99; i++) {
	root_template[i] = {
		name: 'data',
		parse: input => input.startsWith('00')
		              ? parse_emv_qrcps(input, unreserved_template)
		              : input
	}
}

const merchant_account_information_template = {}
const additional_data_template = {}
const unreserved_template = {}
const default_parse = v => v

function parse_emv_qrcps(input, template=root_template) {
	let result = []
	while (input.length >= 4) {
		const attr_id = input.slice(0,2)
		const len = parseInt(input.slice(2, 4))
		const raw_value = input.slice(4, 4+len)
		input = input.slice(4+len)

		const value = (template[attr_id]?.parse || default_parse)(raw_value)
		const attr_name = template[attr_id]?.name || `id:${attr_id}`
		result.push({ attr_name, value })
	}

	if (input !== '') {
		console.warn('Some input was left unprocessed', input)
	}
	return result
}