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80 lines
3.0 KiB
JavaScript
80 lines
3.0 KiB
JavaScript
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/**
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* A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
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* in FIPS 180-2
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* Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
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* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
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*
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*/
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var helpers = require('./helpers');
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var safe_add = function(x, y) {
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var lsw = (x & 0xFFFF) + (y & 0xFFFF);
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var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return (msw << 16) | (lsw & 0xFFFF);
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};
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var S = function(X, n) {
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return (X >>> n) | (X << (32 - n));
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};
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var R = function(X, n) {
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return (X >>> n);
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};
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var Ch = function(x, y, z) {
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return ((x & y) ^ ((~x) & z));
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};
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var Maj = function(x, y, z) {
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return ((x & y) ^ (x & z) ^ (y & z));
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};
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var Sigma0256 = function(x) {
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return (S(x, 2) ^ S(x, 13) ^ S(x, 22));
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};
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var Sigma1256 = function(x) {
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return (S(x, 6) ^ S(x, 11) ^ S(x, 25));
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};
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var Gamma0256 = function(x) {
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return (S(x, 7) ^ S(x, 18) ^ R(x, 3));
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};
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var Gamma1256 = function(x) {
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return (S(x, 17) ^ S(x, 19) ^ R(x, 10));
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};
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var core_sha256 = function(m, l) {
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var K = new Array(0x428A2F98,0x71374491,0xB5C0FBCF,0xE9B5DBA5,0x3956C25B,0x59F111F1,0x923F82A4,0xAB1C5ED5,0xD807AA98,0x12835B01,0x243185BE,0x550C7DC3,0x72BE5D74,0x80DEB1FE,0x9BDC06A7,0xC19BF174,0xE49B69C1,0xEFBE4786,0xFC19DC6,0x240CA1CC,0x2DE92C6F,0x4A7484AA,0x5CB0A9DC,0x76F988DA,0x983E5152,0xA831C66D,0xB00327C8,0xBF597FC7,0xC6E00BF3,0xD5A79147,0x6CA6351,0x14292967,0x27B70A85,0x2E1B2138,0x4D2C6DFC,0x53380D13,0x650A7354,0x766A0ABB,0x81C2C92E,0x92722C85,0xA2BFE8A1,0xA81A664B,0xC24B8B70,0xC76C51A3,0xD192E819,0xD6990624,0xF40E3585,0x106AA070,0x19A4C116,0x1E376C08,0x2748774C,0x34B0BCB5,0x391C0CB3,0x4ED8AA4A,0x5B9CCA4F,0x682E6FF3,0x748F82EE,0x78A5636F,0x84C87814,0x8CC70208,0x90BEFFFA,0xA4506CEB,0xBEF9A3F7,0xC67178F2);
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var HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
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var W = new Array(64);
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var a, b, c, d, e, f, g, h, i, j;
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var T1, T2;
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/* append padding */
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m[l >> 5] |= 0x80 << (24 - l % 32);
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m[((l + 64 >> 9) << 4) + 15] = l;
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for (var i = 0; i < m.length; i += 16) {
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a = HASH[0]; b = HASH[1]; c = HASH[2]; d = HASH[3]; e = HASH[4]; f = HASH[5]; g = HASH[6]; h = HASH[7];
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for (var j = 0; j < 64; j++) {
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if (j < 16) {
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W[j] = m[j + i];
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} else {
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W[j] = safe_add(safe_add(safe_add(Gamma1256(W[j - 2]), W[j - 7]), Gamma0256(W[j - 15])), W[j - 16]);
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}
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T1 = safe_add(safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]), W[j]);
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T2 = safe_add(Sigma0256(a), Maj(a, b, c));
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h = g; g = f; f = e; e = safe_add(d, T1); d = c; c = b; b = a; a = safe_add(T1, T2);
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}
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HASH[0] = safe_add(a, HASH[0]); HASH[1] = safe_add(b, HASH[1]); HASH[2] = safe_add(c, HASH[2]); HASH[3] = safe_add(d, HASH[3]);
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HASH[4] = safe_add(e, HASH[4]); HASH[5] = safe_add(f, HASH[5]); HASH[6] = safe_add(g, HASH[6]); HASH[7] = safe_add(h, HASH[7]);
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}
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return HASH;
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};
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module.exports = function sha256(buf) {
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return helpers.hash(buf, core_sha256, 32, true);
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};
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