diff options
Diffstat (limited to 'chromium/chrome/browser/resources/cryptotoken/sha256.js')
-rw-r--r-- | chromium/chrome/browser/resources/cryptotoken/sha256.js | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/chromium/chrome/browser/resources/cryptotoken/sha256.js b/chromium/chrome/browser/resources/cryptotoken/sha256.js new file mode 100644 index 00000000000..fd5834a0664 --- /dev/null +++ b/chromium/chrome/browser/resources/cryptotoken/sha256.js @@ -0,0 +1,179 @@ +// Copyright 2014 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +/** @fileoverview SHA256 in javascript */ +// SHA256 { +// SHA256(); +// void reset(); +// void update(byte[] data, opt_length); +// byte[32] digest(); +// } + +/** @constructor */ +function SHA256() { + this._buf = new Array(64); + this._W = new Array(64); + this._pad = new Array(64); + this._k = [ + 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, + 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, + 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, + 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, + 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, + 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, + 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 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]; + + this._pad[0] = 0x80; + for (var i = 1; i < 64; ++i) this._pad[i] = 0; + + this.reset(); +} + +/** Reset the hasher */ +SHA256.prototype.reset = function() { + this._chain = [ + 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, + 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]; + + this._inbuf = 0; + this._total = 0; +}; + +/** Hash the next block of 64 bytes + * @param {Array.<number>} buf A 64 byte buffer + */ +SHA256.prototype._compress = function(buf) { + var W = this._W; + var k = this._k; + + function _rotr(w, r) { return ((w << (32 - r)) | (w >>> r)); }; + + // get 16 big endian words + for (var i = 0; i < 64; i += 4) { + var w = (buf[i] << 24) | + (buf[i + 1] << 16) | + (buf[i + 2] << 8) | + (buf[i + 3]); + W[i / 4] = w; + } + + // expand to 64 words + for (var i = 16; i < 64; ++i) { + var s0 = _rotr(W[i - 15], 7) ^ _rotr(W[i - 15], 18) ^ (W[i - 15] >>> 3); + var s1 = _rotr(W[i - 2], 17) ^ _rotr(W[i - 2], 19) ^ (W[i - 2] >>> 10); + W[i] = (W[i - 16] + s0 + W[i - 7] + s1) & 0xffffffff; + } + + var A = this._chain[0]; + var B = this._chain[1]; + var C = this._chain[2]; + var D = this._chain[3]; + var E = this._chain[4]; + var F = this._chain[5]; + var G = this._chain[6]; + var H = this._chain[7]; + + for (var i = 0; i < 64; ++i) { + var S0 = _rotr(A, 2) ^ _rotr(A, 13) ^ _rotr(A, 22); + var maj = (A & B) ^ (A & C) ^ (B & C); + var t2 = (S0 + maj) & 0xffffffff; + var S1 = _rotr(E, 6) ^ _rotr(E, 11) ^ _rotr(E, 25); + var ch = (E & F) ^ ((~E) & G); + var t1 = (H + S1 + ch + k[i] + W[i]) & 0xffffffff; + + H = G; + G = F; + F = E; + E = (D + t1) & 0xffffffff; + D = C; + C = B; + B = A; + A = (t1 + t2) & 0xffffffff; + } + + this._chain[0] += A; + this._chain[1] += B; + this._chain[2] += C; + this._chain[3] += D; + this._chain[4] += E; + this._chain[5] += F; + this._chain[6] += G; + this._chain[7] += H; +}; + +/** Update the hash with additional data + * @param {Array.<number>|Uint8Array} bytes The data + * @param {number=} opt_length How many bytes to hash, if not all */ +SHA256.prototype.update = function(bytes, opt_length) { + if (!opt_length) opt_length = bytes.length; + + this._total += opt_length; + for (var n = 0; n < opt_length; ++n) { + this._buf[this._inbuf++] = bytes[n]; + if (this._inbuf == 64) { + this._compress(this._buf); + this._inbuf = 0; + } + } +}; + +/** Update the hash with a specified range from a data buffer + * @param {Array.<number>} bytes The data buffer + * @param {number} start Starting index of the range in bytes + * @param {number} end End index, will not be included in range + */ +SHA256.prototype.updateRange = function(bytes, start, end) { + this._total += (end - start); + for (var n = start; n < end; ++n) { + this._buf[this._inbuf++] = bytes[n]; + if (this._inbuf == 64) { + this._compress(this._buf); + this._inbuf = 0; + } + } +}; + +/** + * Optionally update the hash with additional arguments, and return the + * resulting hash value. + * @param {...*} var_args Data buffers to hash + * @return {Array.<number>} the SHA256 hash value. + */ +SHA256.prototype.digest = function(var_args) { + for (var i = 0; i < arguments.length; ++i) + this.update(arguments[i]); + + var digest = new Array(32); + var totalBits = this._total * 8; + + // add pad 0x80 0x00* + if (this._inbuf < 56) + this.update(this._pad, 56 - this._inbuf); + else + this.update(this._pad, 64 - (this._inbuf - 56)); + + // add # bits, big endian + for (var i = 63; i >= 56; --i) { + this._buf[i] = totalBits & 255; + totalBits >>>= 8; + } + + this._compress(this._buf); + + var n = 0; + for (var i = 0; i < 8; ++i) + for (var j = 24; j >= 0; j -= 8) + digest[n++] = (this._chain[i] >> j) & 255; + + return digest; +}; |