bot-28/node/node_modules/aes-js/lib.esm/padding.js

export function pkcs7Pad(data) {
    const padder = 16 - (data.length % 16);
    const result = new Uint8Array(data.length + padder);
    result.set(data);
    for (let i = data.length; i < result.length; i++) {
        result[i] = padder;
    }
    return result;
}
export function pkcs7Strip(data) {
    if (data.length < 16) {
        throw new TypeError('PKCS#7 invalid length');
    }
    const padder = data[data.length - 1];
    if (padder > 16) {
        throw new TypeError('PKCS#7 padding byte out of range');
    }
    const length = data.length - padder;
    for (let i = 0; i < padder; i++) {
        if (data[length + i] !== padder) {
            throw new TypeError('PKCS#7 invalid padding byte');
        }
    }
    return new Uint8Array(data.subarray(0, length));
}
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