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142 lines
4.8 KiB
142 lines
4.8 KiB
// SHA-256 hash function. Copyright-free. |
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// Requires typed arrays. |
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const SHA256 = {}; |
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SHA256.K = [ |
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, |
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0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, |
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0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, |
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0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, |
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, |
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0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, |
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0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, |
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0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, |
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0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, |
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0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, |
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0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, |
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
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]; |
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// The digest function returns the hash value (digest) |
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// as a 32 byte (typed) array. |
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// message: the string or byte array to hash |
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SHA256.digest = function(message) { |
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var h0 = 0x6a09e667; |
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var h1 = 0xbb67ae85; |
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var h2 = 0x3c6ef372; |
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var h3 = 0xa54ff53a; |
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var h4 = 0x510e527f; |
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var h5 = 0x9b05688c; |
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var h6 = 0x1f83d9ab; |
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var h7 = 0x5be0cd19; |
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var K = SHA256.K; |
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if (typeof message == 'string') { |
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var s = unescape(encodeURIComponent(message)); // UTF-8 |
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message = new Uint8Array(s.length); |
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for (var i = 0; i < s.length; i++) { |
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message[i] = s.charCodeAt(i) & 0xff; |
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} |
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} |
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var length = message.length; |
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var byteLength = Math.floor((length + 72) / 64) * 64; |
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var wordLength = byteLength / 4; |
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var bitLength = length * 8; |
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var m = new Uint8Array(byteLength); |
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m.set(message); |
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m[length] = 0x80; |
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m[byteLength - 4] = bitLength >>> 24; |
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m[byteLength - 3] = (bitLength >>> 16) & 0xff; |
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m[byteLength - 2] = (bitLength >>> 8) & 0xff; |
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m[byteLength - 1] = bitLength & 0xff; |
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var words = new Int32Array(wordLength); |
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var byteIndex = 0; |
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for (var i = 0; i < words.length; i++) { |
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var word = m[byteIndex++] << 24; |
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word |= m[byteIndex++] << 16; |
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word |= m[byteIndex++] << 8; |
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word |= m[byteIndex++]; |
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words[i] = word; |
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} |
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var w = new Int32Array(64); |
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for (var j = 0; j < wordLength; j += 16) { |
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for (i = 0; i < 16; i++) { |
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w[i] = words[j + i]; |
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} |
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for (i = 16; i < 64; i++) { |
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var v = w[i - 15]; |
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var s0 = (v >>> 7) | (v << 25); |
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s0 ^= (v >>> 18) | (v << 14); |
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s0 ^= (v >>> 3); |
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v = w[i - 2]; |
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var s1 = (v >>> 17) | (v << 15); |
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s1 ^= (v >>> 19) | (v << 13); |
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s1 ^= (v >>> 10); |
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w[i] = (w[i - 16] + s0 + w[i - 7] + s1) & 0xffffffff; |
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} |
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var a = h0; |
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var b = h1; |
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var c = h2; |
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var d = h3; |
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var e = h4; |
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var f = h5; |
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var g = h6; |
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var h = h7; |
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for (i = 0; i < 64; i++) { |
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s1 = (e >>> 6) | (e << 26); |
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s1 ^= (e >>> 11) | (e << 21); |
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s1 ^= (e >>> 25) | (e << 7); |
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var ch = (e & f) ^ (~e & g); |
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var temp1 = (h + s1 + ch + K[i] + w[i]) & 0xffffffff; |
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s0 = (a >>> 2) | (a << 30); |
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s0 ^= (a >>> 13) | (a << 19); |
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s0 ^= (a >>> 22) | (a << 10); |
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var maj = (a & b) ^ (a & c) ^ (b & c); |
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var temp2 = (s0 + maj) & 0xffffffff; |
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h = g |
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g = f |
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f = e |
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e = (d + temp1) & 0xffffffff; |
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d = c; |
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c = b; |
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b = a; |
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a = (temp1 + temp2) & 0xffffffff; |
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} |
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h0 = (h0 + a) & 0xffffffff; |
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h1 = (h1 + b) & 0xffffffff; |
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h2 = (h2 + c) & 0xffffffff; |
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h3 = (h3 + d) & 0xffffffff; |
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h4 = (h4 + e) & 0xffffffff; |
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h5 = (h5 + f) & 0xffffffff; |
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h6 = (h6 + g) & 0xffffffff; |
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h7 = (h7 + h) & 0xffffffff; |
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} |
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var hash = new Uint8Array(32); |
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for (var i = 0; i < 4; i++) { |
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hash[i] = (h0 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 4] = (h1 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 8] = (h2 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 12] = (h3 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 16] = (h4 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 20] = (h5 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 24] = (h6 >>> (8 * (3 - i))) & 0xff; |
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hash[i + 28] = (h7 >>> (8 * (3 - i))) & 0xff; |
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} |
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return hash; |
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} |
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// The hash function returns the hash value as a hex string. |
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// message: the string or byte array to hash |
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SHA256.hash = function(message) { |
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var digest = SHA256.digest(message); |
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var hex = ''; |
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for (var i = 0; i < digest.length; i++) { |
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var s = '0' + digest[i].toString(16); |
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hex += s.length > 2 ? s.substring(1) : s; |
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} |
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return hex; |
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} |
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// == Convert to ES6 Module == // |
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export default SHA256; |