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showing results for - "sha256 javascript"
Pietro
16 Mar 2017
1let test = crypto.createHmac('sha256', "key").update("json").digest("base64");
2
source
Matilda
24 Jan 2018
1async function sha256(message) {
2    // encode as UTF-8
3    const msgBuffer = new TextEncoder().encode(message);                    
4    // hash the message
5    const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
6    // convert ArrayBuffer to Array
7    const hashArray = Array.from(new Uint8Array(hashBuffer));
8    // convert bytes to hex string                  
9    const hashHex = hashArray.map(b => ('00' + b.toString(16)).slice(-2)).join('');
10    return hashHex;
11}
source
Darryn
20 Jan 2018
1var sha256 = function sha256(ascii) {
2	function rightRotate(value, amount) {
3		return (value>>>amount) | (value<<(32 - amount));
4	};
5	
6	var mathPow = Math.pow;
7	var maxWord = mathPow(2, 32);
8	var lengthProperty = 'length'
9	var i, j; // Used as a counter across the whole file
10	var result = ''
11
12	var words = [];
13	var asciiBitLength = ascii[lengthProperty]*8;
14	
15	//* caching results is optional - remove/add slash from front of this line to toggle
16	// Initial hash value: first 32 bits of the fractional parts of the square roots of the first 8 primes
17	// (we actually calculate the first 64, but extra values are just ignored)
18	var hash = sha256.h = sha256.h || [];
19	// Round constants: first 32 bits of the fractional parts of the cube roots of the first 64 primes
20	var k = sha256.k = sha256.k || [];
21	var primeCounter = k[lengthProperty];
22	/*/
23	var hash = [], k = [];
24	var primeCounter = 0;
25	//*/
26
27	var isComposite = {};
28	for (var candidate = 2; primeCounter < 64; candidate++) {
29		if (!isComposite[candidate]) {
30			for (i = 0; i < 313; i += candidate) {
31				isComposite[i] = candidate;
32			}
33			hash[primeCounter] = (mathPow(candidate, .5)*maxWord)|0;
34			k[primeCounter++] = (mathPow(candidate, 1/3)*maxWord)|0;
35		}
36	}
37	
38	ascii += '\x80' // Append Ƈ' bit (plus zero padding)
39	while (ascii[lengthProperty]%64 - 56) ascii += '\x00' // More zero padding
40	for (i = 0; i < ascii[lengthProperty]; i++) {
41		j = ascii.charCodeAt(i);
42		if (j>>8) return; // ASCII check: only accept characters in range 0-255
43		words[i>>2] |= j << ((3 - i)%4)*8;
44	}
45	words[words[lengthProperty]] = ((asciiBitLength/maxWord)|0);
46	words[words[lengthProperty]] = (asciiBitLength)
47	
48	// process each chunk
49	for (j = 0; j < words[lengthProperty];) {
50		var w = words.slice(j, j += 16); // The message is expanded into 64 words as part of the iteration
51		var oldHash = hash;
52		// This is now the undefinedworking hash", often labelled as variables a...g
53		// (we have to truncate as well, otherwise extra entries at the end accumulate
54		hash = hash.slice(0, 8);
55		
56		for (i = 0; i < 64; i++) {
57			var i2 = i + j;
58			// Expand the message into 64 words
59			// Used below if 
60			var w15 = w[i - 15], w2 = w[i - 2];
61
62			// Iterate
63			var a = hash[0], e = hash[4];
64			var temp1 = hash[7]
65				+ (rightRotate(e, 6) ^ rightRotate(e, 11) ^ rightRotate(e, 25)) // S1
66				+ ((e&hash[5])^((~e)&hash[6])) // ch
67				+ k[i]
68				// Expand the message schedule if needed
69				+ (w[i] = (i < 16) ? w[i] : (
70						w[i - 16]
71						+ (rightRotate(w15, 7) ^ rightRotate(w15, 18) ^ (w15>>>3)) // s0
72						+ w[i - 7]
73						+ (rightRotate(w2, 17) ^ rightRotate(w2, 19) ^ (w2>>>10)) // s1
74					)|0
75				);
76			// This is only used once, so *could* be moved below, but it only saves 4 bytes and makes things unreadble
77			var temp2 = (rightRotate(a, 2) ^ rightRotate(a, 13) ^ rightRotate(a, 22)) // S0
78				+ ((a&hash[1])^(a&hash[2])^(hash[1]&hash[2])); // maj
79			
80			hash = [(temp1 + temp2)|0].concat(hash); // We don't bother trimming off the extra ones, they're harmless as long as we're truncating when we do the slice()
81			hash[4] = (hash[4] + temp1)|0;
82		}
83		
84		for (i = 0; i < 8; i++) {
85			hash[i] = (hash[i] + oldHash[i])|0;
86		}
87	}
88	
89	for (i = 0; i < 8; i++) {
90		for (j = 3; j + 1; j--) {
91			var b = (hash[i]>>(j*8))&255;
92			result += ((b < 16) ? 0 : '') + b.toString(16);
93		}
94	}
95	return result;
96};
source
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