53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
// Taken from https://github.com/ehn-dcc-development/ehn-sign-verify-javascript-trivial/blob/main/cose_verify.js
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// and https://github.com/ehn-dcc-development/dgc-check-mobile-app/blob/main/src/app/cose-js/sign.js
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import base45 from 'base45';
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import pako from 'pako';
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import cbor from 'cbor-js';
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export function typedArrayToBufferSliced(array: Uint8Array): ArrayBuffer {
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return array.buffer.slice(array.byteOffset, array.byteLength + array.byteOffset);
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}
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export function typedArrayToBuffer(array: Uint8Array): ArrayBuffer {
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var buffer = new ArrayBuffer(array.length);
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array.map(function (value, i) {
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return buffer[i] = value;
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})
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return array.buffer;
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}
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export function decodeData(data: string): Object {
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if (data.startsWith('https://')) {
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var url = new URL(data);
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data = decodeURIComponent(url.hash.substring(1));
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}
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if (data.startsWith('HC1')) {
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data = data.substring(3);
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if (data.startsWith(':')) {
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data = data.substring(1);
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}
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}
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var arrayBuffer: Uint8Array = base45.decode(data);
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if (arrayBuffer[0] == 0x78) {
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arrayBuffer = pako.inflate(arrayBuffer);
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}
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var payloadArray: Array<Uint8Array> = cbor.decode(typedArrayToBuffer(arrayBuffer));
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if (!Array.isArray(payloadArray) || payloadArray.length !== 4) {
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throw new Error('decodingFailed');
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}
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var plaintext: Uint8Array = payloadArray[2];
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var decoded: Object = cbor.decode(typedArrayToBufferSliced(plaintext));
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return decoded;
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}
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