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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SubtleCryptoProvider = void 0;
const CryptoProvider_js_1 = require("./CryptoProvider.js");
/**
* `CryptoProvider which uses the SubtleCrypto interface of the Web Crypto API.
*
* This only supports asynchronous operations.
*/
class SubtleCryptoProvider extends CryptoProvider_js_1.CryptoProvider {
constructor(subtleCrypto) {
super();
// If no subtle crypto is interface, default to the global namespace. This
// is to allow custom interfaces (eg. using the Node webcrypto interface in
// tests).
this.subtleCrypto = subtleCrypto || crypto.subtle;
}
/** @override */
computeHMACSignature(payload, secret) {
throw new CryptoProvider_js_1.CryptoProviderOnlySupportsAsyncError('SubtleCryptoProvider cannot be used in a synchronous context.');
}
/** @override */
async computeHMACSignatureAsync(payload, secret) {
const encoder = new TextEncoder();
const key = await this.subtleCrypto.importKey('raw', encoder.encode(secret), {
name: 'HMAC',
hash: { name: 'SHA-256' },
}, false, ['sign']);
const signatureBuffer = await this.subtleCrypto.sign('hmac', key, encoder.encode(payload));
// crypto.subtle returns the signature in base64 format. This must be
// encoded in hex to match the CryptoProvider contract. We map each byte in
// the buffer to its corresponding hex octet and then combine into a string.
const signatureBytes = new Uint8Array(signatureBuffer);
const signatureHexCodes = new Array(signatureBytes.length);
for (let i = 0; i < signatureBytes.length; i++) {
signatureHexCodes[i] = byteHexMapping[signatureBytes[i]];
}
return signatureHexCodes.join('');
}
/** @override */
async computeSHA256Async(data) {
return new Uint8Array(await this.subtleCrypto.digest('SHA-256', data));
}
}
exports.SubtleCryptoProvider = SubtleCryptoProvider;
// Cached mapping of byte to hex representation. We do this once to avoid re-
// computing every time we need to convert the result of a signature to hex.
const byteHexMapping = new Array(256);
for (let i = 0; i < byteHexMapping.length; i++) {
byteHexMapping[i] = i.toString(16).padStart(2, '0');
}