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import { base64Decode } from './numeric-encoding-utils';
function getKeyIdBytes(str: string): Uint8Array {
const keyIdbytes = strToUtf8array(str).subarray(0, 16);
const paddedkeyIdbytes = new Uint8Array(16);
paddedkeyIdbytes.set(keyIdbytes, 16 - keyIdbytes.length);
return paddedkeyIdbytes;
}
export function changeEndianness(keyId: Uint8Array) {
const swap = function (array: Uint8Array, from: number, to: number) {
const cur = array[from];
array[from] = array[to];
array[to] = cur;
};
swap(keyId, 0, 3);
swap(keyId, 1, 2);
swap(keyId, 4, 5);
swap(keyId, 6, 7);
}
export function convertDataUriToArrayBytes(uri: string): Uint8Array | null {
// data:[<media type][;attribute=value][;base64],<data>
const colonsplit = uri.split(':');
let keydata: Uint8Array | null = null;
if (colonsplit[0] === 'data' && colonsplit.length === 2) {
const semicolonsplit = colonsplit[1].split(';');
const commasplit = semicolonsplit[semicolonsplit.length - 1].split(',');
if (commasplit.length === 2) {
const isbase64 = commasplit[0] === 'base64';
const data = commasplit[1];
if (isbase64) {
semicolonsplit.splice(-1, 1); // remove from processing
keydata = base64Decode(data);
} else {
keydata = getKeyIdBytes(data);
}
}
}
return keydata;
}
export function strToUtf8array(str: string): Uint8Array {
return Uint8Array.from(unescape(encodeURIComponent(str)), (c) =>
c.charCodeAt(0)
);
}