Generating hash using native Crypto API (Example)

You can find more information about the crypto api here:  https://developer.mozilla.org/en-US/docs/Web/API/Window/crypto

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function arrayBufferToStringAsync( /*ArrayBuffer*/ buffer) {     var reader = new FileReader();     return readAsync(reader, 'Text', new Blob([buffer])).then(function() {         return new Promise(function(resolve, reject) {             resolve(reader.result);         });     }); };   function arrayBufferToHexAsync( /*ArrayBuffer*/ buffer) {     return new Promise(function(success, error) {         arrayBufferToStringAsync(buffer).then(function(string) {             var hex = '';             for (var i = 0; i < string.length; i++) {                 var char = ('000' + string.charCodeAt(i).toString(16)).slice(-4);                 hex += char;             }               success(hex);         }).catch(error);     }); };   function readAsync( /* FileReader */ reader, as, data, encoding) {     return new Promise(function(resolve, reject) {         reader.onloadend = resolve;         reader.onerror = reject;         reader['readAs' + as](data, encoding);     }); };   var blob = new Blob(['Hello World']); var reader = new FileReader();   readAsync(reader, 'ArrayBuffer', blob).then(function() {     var result = reader.result;     return crypto.subtle.digest("SHA-1", result); }).then(function(hash) {     return arrayBufferToHexAsync(hash); }).then(function(hexHash) {     console.log(hexHash); });