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+/**
+ * Javascript implementation of RSA-KEM.
+ *
+ * @author Lautaro Cozzani Rodriguez
+ * @author Dave Longley
+ *
+ * Copyright (c) 2014 Lautaro Cozzani <lautaro.cozzani@scytl.com>
+ * Copyright (c) 2014 Digital Bazaar, Inc.
+ */
+(function() {
+/* ########## Begin module implementation ########## */
+function initModule(forge) {
+
+forge.kem = forge.kem || {};
+
+var BigInteger = forge.jsbn.BigInteger;
+
+/**
+ * The API for the RSA Key Encapsulation Mechanism (RSA-KEM) from ISO 18033-2.
+ */
+forge.kem.rsa = {};
+
+/**
+ * Creates an RSA KEM API object for generating a secret asymmetric key.
+ *
+ * The symmetric key may be generated via a call to 'encrypt', which will
+ * produce a ciphertext to be transmitted to the recipient and a key to be
+ * kept secret. The ciphertext is a parameter to be passed to 'decrypt' which
+ * will produce the same secret key for the recipient to use to decrypt a
+ * message that was encrypted with the secret key.
+ *
+ * @param kdf the KDF API to use (eg: new forge.kem.kdf1()).
+ * @param options the options to use.
+ *          [prng] a custom crypto-secure pseudo-random number generator to use,
+ *            that must define "getBytesSync".
+ */
+forge.kem.rsa.create = function(kdf, options) {
+  options = options || {};
+  var prng = options.prng || forge.random;
+
+  var kem = {};
+
+  /**
+   * Generates a secret key and its encapsulation.
+   *
+   * @param publicKey the RSA public key to encrypt with.
+   * @param keyLength the length, in bytes, of the secret key to generate.
+   *
+   * @return an object with:
+   *   encapsulation: the ciphertext for generating the secret key, as a
+   *     binary-encoded string of bytes.
+   *   key: the secret key to use for encrypting a message.
+   */
+  kem.encrypt = function(publicKey, keyLength) {
+    // generate a random r where 1 > r > n
+    var byteLength = Math.ceil(publicKey.n.bitLength() / 8);
+    var r;
+    do {
+      r = new BigInteger(
+        forge.util.bytesToHex(prng.getBytesSync(byteLength)),
+        16).mod(publicKey.n);
+    } while(r.equals(BigInteger.ZERO));
+
+    // prepend r with zeros
+    r = forge.util.hexToBytes(r.toString(16));
+    var zeros = byteLength - r.length;
+    if(zeros > 0) {
+      r = forge.util.fillString(String.fromCharCode(0), zeros) + r;
+    }
+
+    // encrypt the random
+    var encapsulation = publicKey.encrypt(r, 'NONE');
+
+    // generate the secret key
+    var key = kdf.generate(r, keyLength);
+
+    return {encapsulation: encapsulation, key: key};
+  };
+
+  /**
+   * Decrypts an encapsulated secret key.
+   *
+   * @param privateKey the RSA private key to decrypt with.
+   * @param encapsulation the ciphertext for generating the secret key, as
+   *          a binary-encoded string of bytes.
+   * @param keyLength the length, in bytes, of the secret key to generate.
+   *
+   * @return the secret key as a binary-encoded string of bytes.
+   */
+  kem.decrypt = function(privateKey, encapsulation, keyLength) {
+    // decrypt the encapsulation and generate the secret key
+    var r = privateKey.decrypt(encapsulation, 'NONE');
+    return kdf.generate(r, keyLength);
+  };
+
+  return kem;
+};
+
+// TODO: add forge.kem.kdf.create('KDF1', {md: ..., ...}) API?
+
+/**
+ * Creates a key derivation API object that implements KDF1 per ISO 18033-2.
+ *
+ * @param md the hash API to use.
+ * @param [digestLength] an optional digest length that must be positive and
+ *          less than or equal to md.digestLength.
+ *
+ * @return a KDF1 API object.
+ */
+forge.kem.kdf1 = function(md, digestLength) {
+  _createKDF(this, md, 0, digestLength || md.digestLength);
+};
+
+/**
+ * Creates a key derivation API object that implements KDF2 per ISO 18033-2.
+ *
+ * @param md the hash API to use.
+ * @param [digestLength] an optional digest length that must be positive and
+ *          less than or equal to md.digestLength.
+ *
+ * @return a KDF2 API object.
+ */
+forge.kem.kdf2 = function(md, digestLength) {
+  _createKDF(this, md, 1, digestLength || md.digestLength);
+};
+
+/**
+ * Creates a KDF1 or KDF2 API object.
+ *
+ * @param md the hash API to use.
+ * @param counterStart the starting index for the counter.
+ * @param digestLength the digest length to use.
+ *
+ * @return the KDF API object.
+ */
+function _createKDF(kdf, md, counterStart, digestLength) {
+  /**
+   * Generate a key of the specified length.
+   *
+   * @param x the binary-encoded byte string to generate a key from.
+   * @param length the number of bytes to generate (the size of the key).
+   *
+   * @return the key as a binary-encoded string.
+   */
+  kdf.generate = function(x, length) {
+    var key = new forge.util.ByteBuffer();
+
+    // run counter from counterStart to ceil(length / Hash.len)
+    var k = Math.ceil(length / digestLength) + counterStart;
+
+    var c = new forge.util.ByteBuffer();
+    for(var i = counterStart; i < k; ++i) {
+      // I2OSP(i, 4): convert counter to an octet string of 4 octets
+      c.putInt32(i);
+
+      // digest 'x' and the counter and add the result to the key
+      md.start();
+      md.update(x + c.getBytes());
+      var hash = md.digest();
+      key.putBytes(hash.getBytes(digestLength));
+    }
+
+    // truncate to the correct key length
+    key.truncate(key.length() - length);
+    return key.getBytes();
+  };
+}
+
+} // end module implementation
+
+/* ########## Begin module wrapper ########## */
+var name = 'kem';
+if(typeof define !== 'function') {
+  // NodeJS -> AMD
+  if(typeof module === 'object' && module.exports) {
+    var nodeJS = true;
+    define = function(ids, factory) {
+      factory(require, module);
+    };
+  } else {
+    // <script>
+    if(typeof forge === 'undefined') {
+      forge = {};
+    }
+    return initModule(forge);
+  }
+}
+// AMD
+var deps;
+var defineFunc = function(require, module) {
+  module.exports = function(forge) {
+    var mods = deps.map(function(dep) {
+      return require(dep);
+    }).concat(initModule);
+    // handle circular dependencies
+    forge = forge || {};
+    forge.defined = forge.defined || {};
+    if(forge.defined[name]) {
+      return forge[name];
+    }
+    forge.defined[name] = true;
+    for(var i = 0; i < mods.length; ++i) {
+      mods[i](forge);
+    }
+    return forge[name];
+  };
+};
+var tmpDefine = define;
+define = function(ids, factory) {
+  deps = (typeof ids === 'string') ? factory.slice(2) : ids.slice(2);
+  if(nodeJS) {
+    delete define;
+    return tmpDefine.apply(null, Array.prototype.slice.call(arguments, 0));
+  }
+  define = tmpDefine;
+  return define.apply(null, Array.prototype.slice.call(arguments, 0));
+};
+define(['require', 'module', './util','./random','./jsbn'], function() {
+  defineFunc.apply(null, Array.prototype.slice.call(arguments, 0));
+});
+})();