| 1 | import { stringToU8a, u8aFixLength } from '@polkadot/util';
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| 2 | import { naclDecrypt } from '../nacl/index.js';
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| 3 | import { scryptEncode, scryptFromU8a } from '../scrypt/index.js';
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| 4 | import { ENCODING, NONCE_LENGTH, SCRYPT_LENGTH } from './constants.js';
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| 5 | export function jsonDecryptData(encrypted, passphrase, encType = ENCODING) {
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| 6 | if (!encrypted) {
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| 7 | throw new Error('No encrypted data available to decode');
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| 8 | }
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| 9 | else if (encType.includes('xsalsa20-poly1305') && !passphrase) {
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| 10 | throw new Error('Password required to decode encrypted data');
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| 11 | }
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| 12 | let encoded = encrypted;
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| 13 | if (passphrase) {
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| 14 | let password;
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| 15 | if (encType.includes('scrypt')) {
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| 16 | const { params, salt } = scryptFromU8a(encrypted);
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| 17 | password = scryptEncode(passphrase, salt, params).password;
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| 18 | encrypted = encrypted.subarray(SCRYPT_LENGTH);
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| 19 | }
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| 20 | else {
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| 21 | password = stringToU8a(passphrase);
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| 22 | }
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| 23 | encoded = naclDecrypt(encrypted.subarray(NONCE_LENGTH), encrypted.subarray(0, NONCE_LENGTH), u8aFixLength(password, 256, true));
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| 24 | }
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| 25 | if (!encoded) {
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| 26 | throw new Error('Unable to decode using the supplied passphrase');
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| 27 | }
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| 28 | return encoded;
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| 29 | }
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