1  var Hmac = require('./browserHmac');
 2  var Md5 = require('./browserMd5');
 3  var Sha1 = require('./browserSha1');
 4  var Sha256 = require('./browserSha256');
 5  
 6  /**
 7   * @api private
 8   */
 9  module.exports = exports = {
10      createHash: function createHash(alg) {
11        alg = alg.toLowerCase();
12        if (alg === 'md5') {
13          return new Md5();
14        } else if (alg === 'sha256') {
15          return new Sha256();
16        } else if (alg === 'sha1') {
17          return new Sha1();
18        }
19  
20        throw new Error('Hash algorithm ' + alg + ' is not supported in the browser SDK');
21      },
22      createHmac: function createHmac(alg, key) {
23        alg = alg.toLowerCase();
24        if (alg === 'md5') {
25          return new Hmac(Md5, key);
26        } else if (alg === 'sha256') {
27          return new Hmac(Sha256, key);
28        } else if (alg === 'sha1') {
29          return new Hmac(Sha1, key);
30        }
31  
32        throw new Error('HMAC algorithm ' + alg + ' is not supported in the browser SDK');
33      },
34      createSign: function() {
35        throw new Error('createSign is not implemented in the browser');
36      }
37    };