All files / src/crypter/padding ISOIEC78164Padding.ts

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import type { IPadding } from './IPadding';
 
export class ISOIEC7864Padding implements IPadding {
 
    public addTo(data: Uint8Array, blockSize: number): Uint8Array {
        const paddingLength = blockSize - data.length % blockSize;
        return new Uint8Array([...data, 0x80, ...new Array<number>(paddingLength - 1).fill(0)]);
    }
 
    public removeFrom(data: Uint8Array): Uint8Array {
        let index = data.length - 1;
        while (data[index] !== 0x80)
            index -= 1;
        return data.slice(0, index);
    }
}