Run results for: Simple string compare vs SHA-1 hash

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.4.1

Device Platform: Mobile

Date tested: one year ago

===

16K/s

SHA-1

130/s

View exact numbers

Test name	Executions per second
✓ ===	16,150 Ops/sec
SHA-1	130 Ops/sec

Script Preparation code:

let s10MB = "0123456789".repeat(1000*1000);
var strings10MB = Array.from(Array(20)).map(o=>s10MB + String.fromCharCode(32+~~(Math.random()*96)));

function hashString(input) {
    var encoder = new TextEncoder();
    return crypto.subtle.digest('SHA-1', encoder.encode(input)).then(function (hashBuffer) {
      var hashArray = Array.from(new Uint8Array(hashBuffer));
      return hashArray.map(byte => byte.toString(16).padStart(2, '0')).join('');
    });
}

Tests:

===
const s1 = strings10MB[~~(strings10MB.length*Math.random())]; const s2 = strings10MB[~~(strings10MB.length*Math.random())]; const b = s1 === s2;
SHA-1
const s1 = strings10MB[~~(strings10MB.length*Math.random())]; const s2 = strings10MB[~~(strings10MB.length*Math.random())]; const hash1 = hashString(s1); const hash2 = hashString(s2); const b = hash1 === hash2;

Run results for: Simple string compare vs SHA-1 hash

Worst case large string comparison.

===

SHA-1