57 lines
2.0 KiB
JavaScript
57 lines
2.0 KiB
JavaScript
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export function makeDERLength(length) {
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if (length < 0x80) {
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return [length];
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}
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var r = [];
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while (true) {
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r.push(length & 0xff);
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if (length < 0x100) {
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break;
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}
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length >>= 8;
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}
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r.push(0x80 + r.length);
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return r.reverse();
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}
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export function makeDERIA5String(text) {
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// convert to char-code array and filter to [0-127]
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var r = [].map
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.call(text, function (c) { return c.charCodeAt(0); })
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.filter(function (n) { return n < 128; });
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return [0x16].concat(makeDERLength(r.length)).concat(r);
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}
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export function makeDERBMPString(text) {
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// convert to char-code array
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// NOTE: In ECMAScript `charCodeAt` returns surrogate pair for >=0x10000 codes,
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// and surrogate pair is valid for BMPString data
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var r = [].map.call(text, function (c) { return c.charCodeAt(0); });
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var ua = new Uint8Array(r.length * 2);
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var dv = new DataView(ua.buffer);
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// store codes as big-endian
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r.forEach(function (v, i) {
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dv.setUint16(i * 2, v, false);
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});
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return [0x1e].concat(makeDERLength(ua.length)).concat(
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// convert Uint8Array to number[] (not using spread operator)
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[].slice.call(ua));
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}
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export function makeDEROctetString(bin) {
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if (!(bin instanceof Array)) {
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// convert Uint8Array to number[] (not using spread operator)
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bin = [].slice.call(bin);
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}
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return [0x04].concat(makeDERLength(bin.length)).concat(bin);
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}
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export function makeDERTaggedData(tag, body) {
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return [0xa0 + tag].concat(makeDERLength(body.length)).concat(body);
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}
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export function makeDERSequence(body) {
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return [0x30].concat(makeDERLength(body.length)).concat(body);
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}
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export function arrayToDERSet(items) {
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var r = items.reduce(function (prev, item) {
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return prev.concat(item instanceof Array ? item : item.toDER());
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}, []);
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return [0x31].concat(makeDERLength(r.length)).concat(r);
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}
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