rusha.js

/*
 * Rusha, a JavaScript implementation of the Secure Hash Algorithm, SHA-1,
 * as defined in FIPS PUB 180-1, tuned for high performance with large inputs.
 * (http://github.com/srijs/rusha)
 *
 * Inspired by Paul Johnstons implementation (http://pajhome.org.uk/crypt/md5).
 *
 * Copyright (c) 2013 Sam Rijs (http://awesam.de).
 * Released under the terms of the MIT license as follows:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
(function (global) {
    // If we'e running in Node.JS, export a module.
    if (typeof module !== 'undefined') {
        module.exports = Rusha;
    }
    // If we're running in a DOM context, export
    // the Rusha object to toplevel.
    if (typeof global !== 'undefined') {
        global.Rusha = Rusha;
    }
    // If we're running in a webworker, accept
    // messages containing a jobid and a buffer
    // or blob object, and return the hash result.
    if (typeof FileReaderSync !== 'undefined') {
        var reader = new FileReaderSync(), hasher = new Rusha(4 * 1024 * 1024);
        self.onmessage = function onMessage(event) {
            var hash, data = event.data.data;
            if (data instanceof Blob) {
                try {
                    data = reader.readAsBinaryString(data);
                } catch (e) {
                    self.postMessage({
                        id: event.data.id,
                        error: e.name
                    });
                    return;
                }
            }
            hash = hasher.digest(data);
            self.postMessage({
                id: event.data.id,
                hash: hash
            });
        };
    }
    var util = {
            getDataType: function (data) {
                if (typeof data === 'string') {
                    return 'string';
                }
                if (data instanceof Array) {
                    return 'array';
                }
                if (typeof global !== 'undefined' && global.Buffer && global.Buffer.isBuffer(data)) {
                    return 'buffer';
                }
                if (data instanceof ArrayBuffer) {
                    return 'arraybuffer';
                }
                if (data.buffer instanceof ArrayBuffer) {
                    return 'view';
                }
                throw new Error('Unsupported data type.');
            }
        };
    // The Rusha object is a wrapper around the low-level RushaCore.
    // It provides means of converting different inputs to the
    // format accepted by RushaCore as well as other utility methods.
    function Rusha(chunkSize) {
        'use strict';
        // Private object structure.
        var self$2 = { fill: 0 };
        // Calculate the length of buffer that the sha1 routine uses
        // including the padding.
        var padlen = function (len) {
            for (len += 9; len % 64 > 0; len += 1);
            return len;
        };
        var padZeroes = function (bin, len) {
            for (var i = len >> 2; i < bin.length; i++)
                bin[i] = 0;
        };
        var padData = function (bin, chunkLen, msgLen) {
            bin[chunkLen >> 2] |= 128 << 24 - (chunkLen % 4 << 3);
            bin[((chunkLen >> 2) + 2 & ~15) + 15] = msgLen << 3;
        };
        // Convert a binary string and write it to the heap.
        // A binary string is expected to only contain char codes < 256.
        var convStr = function (H8, H32, start, len, off) {
            var str = this, i, om = off % 4, lm = len % 4, j = len - lm;
            if (j > 0) {
                switch (om) {
                case 0:
                    H8[off + 3 | 0] = str.charCodeAt(start);
                case 1:
                    H8[off + 2 | 0] = str.charCodeAt(start + 1);
                case 2:
                    H8[off + 1 | 0] = str.charCodeAt(start + 2);
                case 3:
                    H8[off | 0] = str.charCodeAt(start + 3);
                }
            }
            for (i = om; i < j; i = i + 4 | 0) {
                H32[off + i >> 2] = str.charCodeAt(start + i) << 24 | str.charCodeAt(start + i + 1) << 16 | str.charCodeAt(start + i + 2) << 8 | str.charCodeAt(start + i + 3);
            }
            switch (lm) {
            case 3:
                H8[off + j + 1 | 0] = str.charCodeAt(start + j + 2);
            case 2:
                H8[off + j + 2 | 0] = str.charCodeAt(start + j + 1);
            case 1:
                H8[off + j + 3 | 0] = str.charCodeAt(start + j);
            }
        };
        // Convert a buffer or array and write it to the heap.
        // The buffer or array is expected to only contain elements < 256.
        var convBuf = function (H8, H32, start, len, off) {
            var buf = this, i, om = off % 4, lm = len % 4, j = len - lm;
            if (j > 0) {
                switch (om) {
                case 0:
                    H8[off + 3 | 0] = buf[start];
                case 1:
                    H8[off + 2 | 0] = buf[start + 1];
                case 2:
                    H8[off + 1 | 0] = buf[start + 2];
                case 3:
                    H8[off | 0] = buf[start + 3];
                }
            }
            for (i = 4 - om; i < j; i = i += 4 | 0) {
                H32[off + i >> 2] = buf[start + i] << 24 | buf[start + i + 1] << 16 | buf[start + i + 2] << 8 | buf[start + i + 3];
            }
            switch (lm) {
            case 3:
                H8[off + j + 1 | 0] = buf[start + j + 2];
            case 2:
                H8[off + j + 2 | 0] = buf[start + j + 1];
            case 1:
                H8[off + j + 3 | 0] = buf[start + j];
            }
        };
        var convFn = function (data) {
            switch (util.getDataType(data)) {
            case 'string':
                return convStr.bind(data);
            case 'array':
                return convBuf.bind(data);
            case 'buffer':
                return convBuf.bind(data);
            case 'arraybuffer':
                return convBuf.bind(new Uint8Array(data));
            case 'view':
                return convBuf.bind(new Uint8Array(data.buffer));
            }
        };
        var slice = function (data, offset) {
            switch (util.getDataType(data)) {
            case 'string':
                return data.slice(offset);
            case 'array':
                return data.slice(offset);
            case 'buffer':
                return data.slice(offset);
            case 'arraybuffer':
                return data.slice(offset);
            case 'view':
                return data.buffer.slice(offset);
            }
        };
        // Convert an ArrayBuffer into its hexadecimal string representation.
        var hex = function (arrayBuffer) {
            var i, x, hex_tab = '0123456789abcdef', res = [], binarray = new Uint8Array(arrayBuffer);
            for (i = 0; i < binarray.length; i++) {
                x = binarray[i];
                res[i] = hex_tab.charAt(x >> 4 & 15) + hex_tab.charAt(x >> 0 & 15);
            }
            return res.join('');
        };
        var ceilHeapSize = function (v) {
            // The asm.js spec says:
            // The heap object's byteLength must be either
            // 2^n for n in [12, 24) or 2^24 * n for n ≥ 1.
            // Also, byteLengths smaller than 2^16 are deprecated.
            var p;
            // If v is smaller than 2^16, the smallest possible solution
            // is 2^16.
            if (v <= 65536)
                return 65536;
            // If v < 2^24, we round up to 2^n,
            // otherwise we round up to 2^24 * n.
            if (v < 16777216) {
                for (p = 1; p < v; p = p << 1);
            } else {
                for (p = 16777216; p < v; p += 16777216);
            }
            return p;
        };
        // Initialize the internal data structures to a new capacity.
        var init = function (size) {
            if (size % 64 > 0) {
                throw new Error('Chunk size must be a multiple of 128 bit');
            }
            self$2.maxChunkLen = size;
            self$2.padMaxChunkLen = padlen(size);
            // The size of the heap is the sum of:
            // 1. The padded input message size
            // 2. The extended space the algorithm needs (320 byte)
            // 3. The 160 bit state the algoritm uses
            self$2.heap = new ArrayBuffer(ceilHeapSize(self$2.padMaxChunkLen + 320 + 20));
            self$2.h32 = new Int32Array(self$2.heap);
            self$2.h8 = new Int8Array(self$2.heap);
            self$2.core = RushaCore({
                Int32Array: Int32Array,
                DataView: DataView
            }, {}, self$2.heap);
            self$2.buffer = null;
        };
        // Iinitializethe datastructures according
        // to a chunk siyze.
        init(chunkSize || 64 * 1024);
        var initState = function (heap, padMsgLen) {
            var io = new Int32Array(heap, padMsgLen + 320, 5);
            io[0] = 1732584193;
            io[1] = -271733879;
            io[2] = -1732584194;
            io[3] = 271733878;
            io[4] = -1009589776;
        };
        var padChunk = function (chunkLen, msgLen) {
            var padChunkLen = padlen(chunkLen);
            var view = new Int32Array(self$2.heap, 0, padChunkLen >> 2);
            padZeroes(view, chunkLen);
            padData(view, chunkLen, msgLen);
            return padChunkLen;
        };
        // Write data to the heap.
        var write = function (data, chunkOffset, chunkLen) {
            convFn(data)(self$2.h8, self$2.h32, chunkOffset, chunkLen, 0);
        };
        // Initialize and call the RushaCore,
        // assuming an input buffer of length len * 4.
        var coreCall = function (data, chunkOffset, chunkLen, msgLen, finalize) {
            var padChunkLen = chunkLen;
            if (finalize) {
                padChunkLen = padChunk(chunkLen, msgLen);
            }
            write(data, chunkOffset, chunkLen);
            self$2.core.hash(padChunkLen, self$2.padMaxChunkLen);
        };
        var getRawDigest = function (heap, padMaxChunkLen) {
            var io = new Int32Array(heap, padMaxChunkLen + 320, 5);
            var out = new Int32Array(5);
            var arr = new DataView(out.buffer);
            arr.setInt32(0, io[0], false);
            arr.setInt32(4, io[1], false);
            arr.setInt32(8, io[2], false);
            arr.setInt32(12, io[3], false);
            arr.setInt32(16, io[4], false);
            return out;
        };
        // Calculate the hash digest as an array of 5 32bit integers.
        var rawDigest = this.rawDigest = function (str) {
                var msgLen = str.byteLength || str.length;
                initState(self$2.heap, self$2.padMaxChunkLen);
                var chunkOffset = 0, chunkLen = self$2.maxChunkLen, last;
                for (chunkOffset = 0; msgLen > chunkOffset + chunkLen; chunkOffset += chunkLen) {
                    coreCall(str, chunkOffset, chunkLen, msgLen, false);
                }
                coreCall(str, chunkOffset, msgLen - chunkOffset, msgLen, true);
                return getRawDigest(self$2.heap, self$2.padMaxChunkLen);
            };
        // The digest and digestFrom* interface returns the hash digest
        // as a hex string.
        this.digest = this.digestFromString = this.digestFromBuffer = this.digestFromArrayBuffer = function (str) {
            return hex(rawDigest(str).buffer);
        };
    }
    ;
    // The low-level RushCore module provides the heart of Rusha,
    // a high-speed sha1 implementation working on an Int32Array heap.
    // At first glance, the implementation seems complicated, however
    // with the SHA1 spec at hand, it is obvious this almost a textbook
    // implementation that has a few functions hand-inlined and a few loops
    // hand-unrolled.
    function RushaCore(stdlib, foreign, heap) {
        'use asm';
        var H = new stdlib.Int32Array(heap);
        function hash(k, x) {
            // k in bytes
            k = k | 0;
            x = x | 0;
            var i = 0, j = 0, y0 = 0, z0 = 0, y1 = 0, z1 = 0, y2 = 0, z2 = 0, y3 = 0, z3 = 0, y4 = 0, z4 = 0, t0 = 0, t1 = 0;
            y0 = H[x + 320 >> 2] | 0;
            y1 = H[x + 324 >> 2] | 0;
            y2 = H[x + 328 >> 2] | 0;
            y3 = H[x + 332 >> 2] | 0;
            y4 = H[x + 336 >> 2] | 0;
            for (i = 0; (i | 0) < (k | 0); i = i + 64 | 0) {
                z0 = y0;
                z1 = y1;
                z2 = y2;
                z3 = y3;
                z4 = y4;
                for (j = 0; (j | 0) < 64; j = j + 4 | 0) {
                    t1 = H[i + j >> 2] | 0;
                    t0 = ((y0 << 5 | y0 >>> 27) + (y1 & y2 | ~y1 & y3) | 0) + ((t1 + y4 | 0) + 1518500249 | 0) | 0;
                    y4 = y3;
                    y3 = y2;
                    y2 = y1 << 30 | y1 >>> 2;
                    y1 = y0;
                    y0 = t0;
                    ;
                    H[k + j >> 2] = t1;
                }
                for (j = k + 64 | 0; (j | 0) < (k + 80 | 0); j = j + 4 | 0) {
                    t1 = (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) << 1 | (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) >>> 31;
                    t0 = ((y0 << 5 | y0 >>> 27) + (y1 & y2 | ~y1 & y3) | 0) + ((t1 + y4 | 0) + 1518500249 | 0) | 0;
                    y4 = y3;
                    y3 = y2;
                    y2 = y1 << 30 | y1 >>> 2;
                    y1 = y0;
                    y0 = t0;
                    ;
                    H[j >> 2] = t1;
                }
                for (j = k + 80 | 0; (j | 0) < (k + 160 | 0); j = j + 4 | 0) {
                    t1 = (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) << 1 | (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) >>> 31;
                    t0 = ((y0 << 5 | y0 >>> 27) + (y1 ^ y2 ^ y3) | 0) + ((t1 + y4 | 0) + 1859775393 | 0) | 0;
                    y4 = y3;
                    y3 = y2;
                    y2 = y1 << 30 | y1 >>> 2;
                    y1 = y0;
                    y0 = t0;
                    ;
                    H[j >> 2] = t1;
                }
                for (j = k + 160 | 0; (j | 0) < (k + 240 | 0); j = j + 4 | 0) {
                    t1 = (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) << 1 | (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) >>> 31;
                    t0 = ((y0 << 5 | y0 >>> 27) + (y1 & y2 | y1 & y3 | y2 & y3) | 0) + ((t1 + y4 | 0) - 1894007588 | 0) | 0;
                    y4 = y3;
                    y3 = y2;
                    y2 = y1 << 30 | y1 >>> 2;
                    y1 = y0;
                    y0 = t0;
                    ;
                    H[j >> 2] = t1;
                }
                for (j = k + 240 | 0; (j | 0) < (k + 320 | 0); j = j + 4 | 0) {
                    t1 = (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) << 1 | (H[j - 12 >> 2] ^ H[j - 32 >> 2] ^ H[j - 56 >> 2] ^ H[j - 64 >> 2]) >>> 31;
                    t0 = ((y0 << 5 | y0 >>> 27) + (y1 ^ y2 ^ y3) | 0) + ((t1 + y4 | 0) - 899497514 | 0) | 0;
                    y4 = y3;
                    y3 = y2;
                    y2 = y1 << 30 | y1 >>> 2;
                    y1 = y0;
                    y0 = t0;
                    ;
                    H[j >> 2] = t1;
                }
                y0 = y0 + z0 | 0;
                y1 = y1 + z1 | 0;
                y2 = y2 + z2 | 0;
                y3 = y3 + z3 | 0;
                y4 = y4 + z4 | 0;
            }
            H[x + 320 >> 2] = y0;
            H[x + 324 >> 2] = y1;
            H[x + 328 >> 2] = y2;
            H[x + 332 >> 2] = y3;
            H[x + 336 >> 2] = y4;
        }
        return { hash: hash };
    }
}(this));