SHA256
55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
import { base64ToBytes } from './crypto-utils.js';
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function isByteArrayLike(value) {
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return Array.isArray(value) || ArrayBuffer.isView(value);
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}
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function parseKeypairJson64(raw) {
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const text = String(raw || '').trim();
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if (!text.startsWith('[')) return null;
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let parsed;
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try {
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parsed = JSON.parse(text);
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} catch {
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return null;
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}
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if (!isByteArrayLike(parsed)) return null;
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const asArray = Array.from(parsed);
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if (asArray.length < 32) {
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throw new Error('Некорректный JSON Ed25519-ключ: ожидалось минимум 32 байта');
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}
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const out = new Uint8Array(asArray.length);
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for (let i = 0; i < asArray.length; i += 1) {
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const n = Number(asArray[i]);
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if (!Number.isInteger(n) || n < 0 || n > 255) {
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throw new Error('Некорректный JSON Ed25519-ключ: найдены не-байтовые значения');
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}
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out[i] = n;
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}
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return out;
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}
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export function extractSeed32FromPkcs8B64(pkcs8B64) {
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const bytes = base64ToBytes(String(pkcs8B64 || '').trim());
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if (bytes.length < 32) throw new Error('Некорректный PKCS8 Ed25519-ключ');
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return bytes.slice(bytes.length - 32);
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}
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export function extractEd25519Seed32FromStoredValue(storedKey) {
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const raw = String(storedKey || '').trim();
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if (!raw) throw new Error('Пустой приватный Ed25519-ключ');
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const jsonBytes = parseKeypairJson64(raw);
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if (jsonBytes) {
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return jsonBytes.slice(0, 32);
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}
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return extractSeed32FromPkcs8B64(raw);
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}
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// Legacy API name retained for callers outside the wallet subsystem.
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export const extractClientKey32FromStoredValue = extractEd25519Seed32FromStoredValue;
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