Add preliminary support for Cryptographic coprocessor on stm32 F2 and F4

lib/stm32/f4/crypto.c

@@ -0,0 +1,66 @@
+/** @defgroup crypto_file CRYPTO
+ *
+ * @ingroup STM32F4xx
+ * 
+ * @brief <b>libopencm3 STM32F4xx CRYPTO</b>
+ * 
+ * @version 1.0.0
+ * 
+ * @date 18 Jun 2013
+ *
+ */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/crypto.h>
+
+/**@{*/
+
+/*---------------------------------------------------------------------------*/
+
+/** @brief Set the MAC algorithm
+ */
+void crypto_set_mac_algorithm(crypto_mode_mac_t mode)
+{
+	crypto_set_algorithm((crypto_mode_t) mode);
+}
+
+/**
+ * @brief Swap context
+ * 
+ *@param[in] buf uint32_t Memory space for swap (16 items length)  
+ */
+void crypto_context_swap(uint32_t * buf)
+{
+	int i;
+	/* Apply exact order of ? */
+	for (i = 0; i < 8; i++) {
+		uint32_t save = *buf;
+		*buf++ = CRYP_CSGCMCCMR(i);
+		CRYP_CSGCMCCMR(i) = save;
+	};
+
+	for (i = 0; i < 8; i++) {
+		uint32_t save = *buf;
+		*buf++ = CRYP_CSGCMR(i);
+		CRYP_CSGCMCCMR(i) = save;
+	};
+}
+
+/**@}*/