All files / utils stringCoding.ts

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import { createHash } from 'crypto';
 
export function deriveStringToBuffer(
    ss: string | undefined,
    targetLength: number
): Buffer {
    Iif (!ss) {
        return Buffer.alloc(targetLength);
    }
 
    let base64Buffer: Buffer | null = null;
    try {
        base64Buffer = Buffer.from(ss, 'base64');
    } catch { }
 
    if (base64Buffer?.length === targetLength) {
        return base64Buffer;
    }
 
    const inputBuffer = Buffer.from(ss, 'utf8');
    const hash = createHash('sha256').update(inputBuffer).digest();
 
    const outputBuffer = Buffer.alloc(targetLength);
    hash.copy(outputBuffer, 0, 0, targetLength);
 
    return outputBuffer;
}
 
export function deriveStringToUint8Array(
    ss: string | undefined,
    targetLength: number
): Uint8Array {
    return new Uint8Array(deriveStringToBuffer(ss, targetLength));
}