github.com/jincm/wesharechain@v0.0.0-20210122032815-1537409ce26a/app/lib/crypto1/crypto/crypto.js (about)

     1  /*!
     2   * Crypto-JS v1.1.0
     3   * http://code.google.com/p/crypto-js/
     4   * Copyright (c) 2009, Jeff Mott. All rights reserved.
     5   * http://code.google.com/p/crypto-js/wiki/License
     6   */
     7  (function(){
     8  
     9  var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    10  
    11  // Global Crypto object
    12  window.Crypto = {};
    13  
    14  // Crypto utilities
    15  var util = Crypto.util = {
    16  
    17  	// Bit-wise rotate left
    18  	rotl: function (n, b) {
    19  		return (n << b) | (n >>> (32 - b));
    20  	},
    21  
    22  	// Bit-wise rotate right
    23  	rotr: function (n, b) {
    24  		return (n << (32 - b)) | (n >>> b);
    25  	},
    26  
    27  	// Swap big-endian to little-endian and vice versa
    28  	endian: function (n) {
    29  
    30  		// If number given, swap endian
    31  		if (n.constructor == Number) {
    32  			return util.rotl(n,  8) & 0x00FF00FF |
    33  			       util.rotl(n, 24) & 0xFF00FF00;
    34  		}
    35  
    36  		// Else, assume array and swap all items
    37  		for (var i = 0; i < n.length; i++)
    38  			n[i] = util.endian(n[i]);
    39  		return n;
    40  
    41  	},
    42  
    43  	// Generate an array of any length of random bytes
    44  	randomBytes: function (n) {
    45  		for (var bytes = []; n > 0; n--)
    46  			bytes.push(Math.floor(Math.random() * 256));
    47  		return bytes;
    48  	},
    49  
    50  	// Convert a string to a byte array
    51  	stringToBytes: function (str) {
    52  		var bytes = [];
    53  		for (var i = 0; i < str.length; i++)
    54  			bytes.push(str.charCodeAt(i));
    55  		return bytes;
    56  	},
    57  
    58  	// Convert a byte array to a string
    59  	bytesToString: function (bytes) {
    60  		var str = [];
    61  		for (var i = 0; i < bytes.length; i++)
    62  			str.push(String.fromCharCode(bytes[i]));
    63  		return str.join("");
    64  	},
    65  
    66  	// Convert a string to big-endian 32-bit words
    67  	stringToWords: function (str) {
    68  		var words = [];
    69  		for (var c = 0, b = 0; c < str.length; c++, b += 8)
    70  			words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
    71  		return words;
    72  	},
    73  
    74  	// Convert a byte array to big-endian 32-bits words
    75  	bytesToWords: function (bytes) {
    76  		var words = [];
    77  		for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
    78  			words[b >>> 5] |= bytes[i] << (24 - b % 32);
    79  		return words;
    80  	},
    81  
    82  	// Convert big-endian 32-bit words to a byte array
    83  	wordsToBytes: function (words) {
    84  		var bytes = [];
    85  		for (var b = 0; b < words.length * 32; b += 8)
    86  			bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
    87  		return bytes;
    88  	},
    89  
    90  	// Convert a byte array to a hex string
    91  	bytesToHex: function (bytes) {
    92  		var hex = [];
    93  		for (var i = 0; i < bytes.length; i++) {
    94  			hex.push((bytes[i] >>> 4).toString(16));
    95  			hex.push((bytes[i] & 0xF).toString(16));
    96  		}
    97  		return hex.join("");
    98  	},
    99  
   100  	// Convert a hex string to a byte array
   101  	hexToBytes: function (hex) {
   102  		var bytes = [];
   103  		for (var c = 0; c < hex.length; c += 2)
   104  			bytes.push(parseInt(hex.substr(c, 2), 16));
   105  		return bytes;
   106  	},
   107  
   108  	// Convert a byte array to a base-64 string
   109  	bytesToBase64: function (bytes) {
   110  
   111  		// Use browser-native function if it exists
   112  		if (typeof btoa == "function") return btoa(util.bytesToString(bytes));
   113  
   114  		var base64 = [],
   115  		    overflow;
   116  
   117  		for (var i = 0; i < bytes.length; i++) {
   118  			switch (i % 3) {
   119  				case 0:
   120  					base64.push(base64map.charAt(bytes[i] >>> 2));
   121  					overflow = (bytes[i] & 0x3) << 4;
   122  					break;
   123  				case 1:
   124  					base64.push(base64map.charAt(overflow | (bytes[i] >>> 4)));
   125  					overflow = (bytes[i] & 0xF) << 2;
   126  					break;
   127  				case 2:
   128  					base64.push(base64map.charAt(overflow | (bytes[i] >>> 6)));
   129  					base64.push(base64map.charAt(bytes[i] & 0x3F));
   130  					overflow = -1;
   131  			}
   132  		}
   133  
   134  		// Encode overflow bits, if there are any
   135  		if (overflow != undefined && overflow != -1)
   136  			base64.push(base64map.charAt(overflow));
   137  
   138  		// Add padding
   139  		while (base64.length % 4 != 0) base64.push("=");
   140  
   141  		return base64.join("");
   142  
   143  	},
   144  
   145  	// Convert a base-64 string to a byte array
   146  	base64ToBytes: function (base64) {
   147  
   148  		// Use browser-native function if it exists
   149  		if (typeof atob == "function") return util.stringToBytes(atob(base64));
   150  
   151  		// Remove non-base-64 characters
   152  		base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");
   153  
   154  		var bytes = [];
   155  
   156  		for (var i = 0; i < base64.length; i++) {
   157  			switch (i % 4) {
   158  				case 1:
   159  					bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
   160  					           (base64map.indexOf(base64.charAt(i)) >>> 4));
   161  					break;
   162  				case 2:
   163  					bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
   164  					           (base64map.indexOf(base64.charAt(i)) >>> 2));
   165  					break;
   166  				case 3:
   167  					bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
   168  					           (base64map.indexOf(base64.charAt(i))));
   169  					break;
   170  			}
   171  		}
   172  
   173  		return bytes;
   174  
   175  	}
   176  
   177  };
   178  
   179  // Crypto mode namespace
   180  Crypto.mode = {};
   181  
   182  })();