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git-svn-id: http://moon:8086/svn/software/trunk/projects/mpsk_rx_gui@2 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-07-19 08:20:53 +00:00
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+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2013 - Raw Material Software Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
+#ifndef JUCE_RSAKEY_H_INCLUDED
+#define JUCE_RSAKEY_H_INCLUDED
+
+
+//==============================================================================
+/**
+    RSA public/private key-pair encryption class.
+
+    An object of this type makes up one half of a public/private RSA key pair. Use the
+    createKeyPair() method to create a matching pair for encoding/decoding.
+*/
+class JUCE_API  RSAKey
+{
+public:
+    //==============================================================================
+    /** Creates a null key object.
+
+        Initialise a pair of objects for use with the createKeyPair() method.
+    */
+    RSAKey();
+
+    /** Loads a key from an encoded string representation.
+
+        This reloads a key from a string created by the toString() method.
+    */
+    explicit RSAKey (const String& stringRepresentation);
+
+    /** Destructor. */
+    ~RSAKey();
+
+    bool operator== (const RSAKey& other) const noexcept;
+    bool operator!= (const RSAKey& other) const noexcept;
+
+    //==============================================================================
+    /** Turns the key into a string representation.
+
+        This can be reloaded using the constructor that takes a string.
+    */
+    String toString() const;
+
+    //==============================================================================
+    /** Encodes or decodes a value.
+
+        Call this on the public key object to encode some data, then use the matching
+        private key object to decode it.
+
+        Returns false if the operation couldn't be completed, e.g. if this key hasn't been
+        initialised correctly.
+
+        NOTE: This method dumbly applies this key to this data. If you encode some data
+        and then try to decode it with a key that doesn't match, this method will still
+        happily do its job and return true, but the result won't be what you were expecting.
+        It's your responsibility to check that the result is what you wanted.
+    */
+    bool applyToValue (BigInteger& value) const;
+
+    //==============================================================================
+    /** Creates a public/private key-pair.
+
+        Each key will perform one-way encryption that can only be reversed by
+        using the other key.
+
+        The numBits parameter specifies the size of key, e.g. 128, 256, 512 bit. Bigger
+        sizes are more secure, but this method will take longer to execute.
+
+        The randomSeeds parameter lets you optionally pass it a set of values with
+        which to seed the random number generation, improving the security of the
+        keys generated. If you supply these, make sure you provide more than 2 values,
+        and the more your provide, the better the security.
+    */
+    static void createKeyPair (RSAKey& publicKey,
+                               RSAKey& privateKey,
+                               int numBits,
+                               const int* randomSeeds = nullptr,
+                               int numRandomSeeds = 0);
+
+
+protected:
+    //==============================================================================
+    BigInteger part1, part2;
+
+private:
+    //==============================================================================
+    static BigInteger findBestCommonDivisor (const BigInteger& p, const BigInteger& q);
+
+    JUCE_LEAK_DETECTOR (RSAKey)
+};
+
+
+#endif   // JUCE_RSAKEY_H_INCLUDED