done purchases remove, ocr scan, read image

express-server/node_modules/crypt/crypt.js

@@ -0,0 +1,96 @@
+(function() {
+  var base64map
+      = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
+
+  crypt = {
+    // Bit-wise rotation left
+    rotl: function(n, b) {
+      return (n << b) | (n >>> (32 - b));
+    },
+
+    // Bit-wise rotation right
+    rotr: function(n, b) {
+      return (n << (32 - b)) | (n >>> b);
+    },
+
+    // Swap big-endian to little-endian and vice versa
+    endian: function(n) {
+      // If number given, swap endian
+      if (n.constructor == Number) {
+        return crypt.rotl(n, 8) & 0x00FF00FF | crypt.rotl(n, 24) & 0xFF00FF00;
+      }
+
+      // Else, assume array and swap all items
+      for (var i = 0; i < n.length; i++)
+        n[i] = crypt.endian(n[i]);
+      return n;
+    },
+
+    // Generate an array of any length of random bytes
+    randomBytes: function(n) {
+      for (var bytes = []; n > 0; n--)
+        bytes.push(Math.floor(Math.random() * 256));
+      return bytes;
+    },
+
+    // Convert a byte array to big-endian 32-bit words
+    bytesToWords: function(bytes) {
+      for (var words = [], i = 0, b = 0; i < bytes.length; i++, b += 8)
+        words[b >>> 5] |= bytes[i] << (24 - b % 32);
+      return words;
+    },
+
+    // Convert big-endian 32-bit words to a byte array
+    wordsToBytes: function(words) {
+      for (var bytes = [], b = 0; b < words.length * 32; b += 8)
+        bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
+      return bytes;
+    },
+
+    // Convert a byte array to a hex string
+    bytesToHex: function(bytes) {
+      for (var hex = [], i = 0; i < bytes.length; i++) {
+        hex.push((bytes[i] >>> 4).toString(16));
+        hex.push((bytes[i] & 0xF).toString(16));
+      }
+      return hex.join('');
+    },
+
+    // Convert a hex string to a byte array
+    hexToBytes: function(hex) {
+      for (var bytes = [], c = 0; c < hex.length; c += 2)
+        bytes.push(parseInt(hex.substr(c, 2), 16));
+      return bytes;
+    },
+
+    // Convert a byte array to a base-64 string
+    bytesToBase64: function(bytes) {
+      for (var base64 = [], i = 0; i < bytes.length; i += 3) {
+        var triplet = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
+        for (var j = 0; j < 4; j++)
+          if (i * 8 + j * 6 <= bytes.length * 8)
+            base64.push(base64map.charAt((triplet >>> 6 * (3 - j)) & 0x3F));
+          else
+            base64.push('=');
+      }
+      return base64.join('');
+    },
+
+    // Convert a base-64 string to a byte array
+    base64ToBytes: function(base64) {
+      // Remove non-base-64 characters
+      base64 = base64.replace(/[^A-Z0-9+\/]/ig, '');
+
+      for (var bytes = [], i = 0, imod4 = 0; i < base64.length;
+          imod4 = ++i % 4) {
+        if (imod4 == 0) continue;
+        bytes.push(((base64map.indexOf(base64.charAt(i - 1))
+            & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2))
+            | (base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
+      }
+      return bytes;
+    }
+  };
+
+  module.exports = crypt;
+})();