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i < 16; ++i) W[i] = M.readInt32BE(i * 4) for (; i < 64; ++i) W[i] = (gamma1(W[i - 2]) + W[i - 7] + gamma0(W[i - 15]) + W[i - 16]) | 0 for (var j = 0; j < 64; ++j) { var T1 = (h + sigma1(e) + ch(e, f, g) + K[j] + W[j]) | 0 var T2 = (sigma0(a) + maj(a, b, c)) | 0 h = g g = f f = e e = (d + T1) | 0 d = c c = b b = a a = (T1 + T2) | 0 } this._a = (a + this._a) | 0 this._b = (b + this._b) | 0 this._c = (c + this._c) | 0 this._d = (d + this._d) | 0 this._e = (e + this._e) | 0 this._f = (f + this._f) | 0 this._g = (g + this._g) | 0 this._h = (h + this._h) | 0 } Sha256.prototype._hash = function () { var H = Buffer.allocUnsafe(32) H.writeInt32BE(this._a, 0) H.writeInt32BE(this._b, 4) H.writeInt32BE(this._c, 8) H.writeInt32BE(this._d, 12) H.writeInt32BE(this._e, 16) H.writeInt32BE(this._f, 20) H.writeInt32BE(this._g, 24) H.writeInt32BE(this._h, 28) return H } module.exports = Sha256