Gists By the Google’s update at June 19, 2018, finally, Utilities.computeDigest(), Utilities.computeHmacSha256Signature() and Utilities.computeHmacSignature() got to be able to use the byte arrays. By this, using only native Google Apps Script, the result can be retrieved without using jsSHA. When I used the updated them, the response speed is much faster than that of jsSHA. It is considered that this may be optimized for Google Apps Script. As a sample, it shows 2 samples as follows.