Compare SJCL and WebCrypto SHA-256

sha256-benchmarks.js

// Run on https://start.1password.com to get sjcl


function timeSJCL_SHA256(iterations, value) {
    let timerName = "SJCL SHA-256 (" + value.length + " bytes, " + iterations + " iterations)";
    console.time(timerName);
    for (let i = 0; i < iterations; i++) {
        sjcl.hash.sha256.hash(value);
    }
    console.timeEnd(timerName);
}


function webcryptoDigest(iterations, timerName, value) {
    if (iterations <= 0) {
        console.timeEnd(timerName);
        return
    }

    var buffer = new TextEncoder("utf-8").encode(value);
    return crypto.subtle.digest("SHA-256", buffer).then(() => {
        return webcryptoDigest(iterations - 1, timerName, value);
    });
}

function timeWebCryptoSHA256(iterations, value) {
    let timerName = "WebCrypto SHA-256 (" + value.length + " bytes, " + iterations + " iterations)";

    console.time(timerName);
    return webcryptoDigest(iterations, timerName, value).catch((error) => {
        console.error(error);
    })
}


// 13-byte value
let smallValue = "Hello, World!";
let bigValue = "1234567890";
for (let i = 0; i < 10; i++) {
    bigValue = bigValue + bigValue;
}

// running SJCL tests, they are synchrounous
timeSJCL_SHA256(100, smallValue);
timeSJCL_SHA256(1000, smallValue);
timeSJCL_SHA256(100, bigValue);
timeSJCL_SHA256(1000, bigValue);

// WebCrypto code is async, running sequentially
Promise.resolve(1).then(() => {
    return timeWebCryptoSHA256(100, smallValue);
}).then(() => {
    return timeWebCryptoSHA256(1000, smallValue);
}).then(() => {
    return timeWebCryptoSHA256(100, bigValue);
}).then(() => {
    return timeWebCryptoSHA256(1000, bigValue);
});

Google Chrome Version 56.0.2924.28 beta (64-bit)

SJCL SHA-256 (13 bytes, 100 iterations): 6.054ms
SJCL SHA-256 (13 bytes, 1000 iterations): 15.752ms
SJCL SHA-256 (10240 bytes, 100 iterations): 44.766ms
SJCL SHA-256 (10240 bytes, 1000 iterations): 308.431ms

WebCrypto SHA-256 (13 bytes, 100 iterations): 11.289ms
WebCrypto SHA-256 (13 bytes, 1000 iterations): 58.236ms
WebCrypto SHA-256 (10240 bytes, 100 iterations): 21.599ms
WebCrypto SHA-256 (10240 bytes, 1000 iterations): 163.212ms