moved project source base

lib/Crypto/AES192.cpp

@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2015 Southern Storm Software, Pty Ltd.
+ *
+ * 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.
+ */
+
+#include "AES.h"
+#include "Crypto.h"
+#include <string.h>
+
+#if defined(CRYPTO_AES_DEFAULT) || defined(CRYPTO_DOC)
+
+/**
+ * \class AES192 AES.h <AES.h>
+ * \brief AES block cipher with 192-bit keys.
+ *
+ * \sa AES128, AES256
+ */
+
+/**
+ * \brief Constructs an AES 192-bit block cipher with no initial key.
+ *
+ * This constructor must be followed by a call to setKey() before the
+ * block cipher can be used for encryption or decryption.
+ */
+AES192::AES192()
+{
+    rounds = 12;
+    schedule = sched;
+}
+
+AES192::~AES192()
+{
+    clean(sched);
+}
+
+/**
+ * \brief Size of a 192-bit AES key in bytes.
+ * \return Always returns 24.
+ */
+size_t AES192::keySize() const
+{
+    return 24;
+}
+
+bool AES192::setKey(const uint8_t *key, size_t len)
+{
+    if (len != 24)
+        return false;
+
+    // Copy the key itself into the first 24 bytes of the schedule.
+    uint8_t *schedule = sched;
+    memcpy(schedule, key, 24);
+
+    // Expand the key schedule until we have 208 bytes of expanded key.
+    uint8_t iteration = 1;
+    uint8_t n = 24;
+    uint8_t w = 6;
+    while (n < 208) {
+        if (w == 6) {
+            // Every 24 bytes (6 words) we need to apply the key schedule core.
+            keyScheduleCore(schedule + 24, schedule + 20, iteration);
+            schedule[24] ^= schedule[0];
+            schedule[25] ^= schedule[1];
+            schedule[26] ^= schedule[2];
+            schedule[27] ^= schedule[3];
+            ++iteration;
+            w = 0;
+        } else {
+            // Otherwise just XOR the word with the one 24 bytes previous.
+            schedule[24] = schedule[20] ^ schedule[0];
+            schedule[25] = schedule[21] ^ schedule[1];
+            schedule[26] = schedule[22] ^ schedule[2];
+            schedule[27] = schedule[23] ^ schedule[3];
+        }
+
+        // Advance to the next word in the schedule.
+        schedule += 4;
+        n += 4;
+        ++w;
+    }
+
+    return true;
+}
+
+#endif // CRYPTO_AES_DEFAULT