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163 lines
3.4 KiB
163 lines
3.4 KiB
/**
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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(
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0x428a2f98,
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0x71374491,
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0xb5c0fbcf,
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0xe9b5dba5,
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0x3956c25b,
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0x59f111f1,
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0x923f82a4,
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0xab1c5ed5,
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0xd807aa98,
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0x12835b01,
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0x243185be,
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0x550c7dc3,
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0x72be5d74,
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0x80deb1fe,
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0x9bdc06a7,
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0xc19bf174,
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0xe49b69c1,
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0xefbe4786,
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0xfc19dc6,
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0x240ca1cc,
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0x2de92c6f,
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0x4a7484aa,
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0x5cb0a9dc,
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0x76f988da,
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0x983e5152,
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0xa831c66d,
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0xb00327c8,
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0xbf597fc7,
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0xc6e00bf3,
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0xd5a79147,
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0x6ca6351,
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0x14292967,
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0x27b70a85,
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0x2e1b2138,
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0x4d2c6dfc,
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0x53380d13,
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0x650a7354,
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0x766a0abb,
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0x81c2c92e,
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0x92722c85,
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0xa2bfe8a1,
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0xa81a664b,
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0xc24b8b70,
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0xc76c51a3,
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0xd192e819,
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0xd6990624,
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0xf40e3585,
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0x106aa070,
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0x19a4c116,
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0x1e376c08,
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0x2748774c,
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0x34b0bcb5,
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0x391c0cb3,
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0x4ed8aa4a,
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0x5b9cca4f,
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0x682e6ff3,
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0x748f82ee,
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0x78a5636f,
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0x84c87814,
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0x8cc70208,
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0x90befffa,
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0xa4506ceb,
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0xbef9a3f7,
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0xc67178f2
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);
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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];
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b = HASH[1];
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c = HASH[2];
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d = HASH[3];
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e = HASH[4];
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f = HASH[5];
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g = HASH[6];
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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;
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g = f;
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f = e;
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e = safe_add(d, T1);
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d = c;
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c = b;
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b = a;
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a = safe_add(T1, T2);
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}
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HASH[0] = safe_add(a, HASH[0]);
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HASH[1] = safe_add(b, HASH[1]);
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HASH[2] = safe_add(c, HASH[2]);
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HASH[3] = safe_add(d, HASH[3]);
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HASH[4] = safe_add(e, HASH[4]);
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HASH[5] = safe_add(f, HASH[5]);
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HASH[6] = safe_add(g, HASH[6]);
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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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