blockstack/lib/encryption/hmacSha256.js

The Blockstack Javascript library for authentication, identity, and storage.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const cryptoUtils_1 = require("./cryptoUtils");
class NodeCryptoHmacSha256 {
    constructor(createHmac) {
        this.createHmac = createHmac;
    }
    digest(key, data) {
        return tslib_1.__awaiter(this, void 0, void 0, function* () {
            const result = this.createHmac('sha256', key)
                .update(data)
                .digest();
            return Promise.resolve(result);
        });
    }
}
exports.NodeCryptoHmacSha256 = NodeCryptoHmacSha256;
class WebCryptoHmacSha256 {
    constructor(subtleCrypto) {
        this.subtleCrypto = subtleCrypto;
    }
    digest(key, data) {
        return tslib_1.__awaiter(this, void 0, void 0, function* () {
            const cryptoKey = yield this.subtleCrypto.importKey('raw', key, { name: 'HMAC', hash: 'SHA-256' }, true, ['sign']);
            const sig = yield this.subtleCrypto.sign(
            // The `hash` is only specified for non-compliant browsers like Edge. 
            { name: 'HMAC', hash: 'SHA-256' }, cryptoKey, data);
            return Buffer.from(sig);
        });
    }
}
exports.WebCryptoHmacSha256 = WebCryptoHmacSha256;
function createHmacSha256() {
    return tslib_1.__awaiter(this, void 0, void 0, function* () {
        const cryptoLib = yield cryptoUtils_1.getCryptoLib();
        if (cryptoLib.name === 'subtleCrypto') {
            return new WebCryptoHmacSha256(cryptoLib.lib);
        }
        else {
            return new NodeCryptoHmacSha256(cryptoLib.lib.createHmac);
        }
    });
}
exports.createHmacSha256 = createHmacSha256;
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