Move tinycrypt function

components/bt/porting/ext/tinycrypt/src/utils.c

@@ -0,0 +1,74 @@
+/* utils.c - TinyCrypt platform-dependent run-time operations */
+
+/*
+ *  Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *
+ *    - Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *
+ *    - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ *    - Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <tinycrypt/utils.h>
+#include <tinycrypt/constants.h>
+
+#include <string.h>
+
+#define MASK_TWENTY_SEVEN 0x1b
+
+unsigned int _copy(uint8_t *to, unsigned int to_len,
+		   const uint8_t *from, unsigned int from_len)
+{
+	if (from_len <= to_len) {
+		(void)memcpy(to, from, from_len);
+		return from_len;
+	} else {
+		return TC_CRYPTO_FAIL;
+	}
+}
+
+void _set(void *to, uint8_t val, unsigned int len)
+{
+	(void)memset(to, val, len);
+}
+
+/*
+ * Doubles the value of a byte for values up to 127.
+ */
+uint8_t _double_byte(uint8_t a)
+{
+	return ((a<<1) ^ ((a>>7) * MASK_TWENTY_SEVEN));
+}
+
+int _compare(const uint8_t *a, const uint8_t *b, size_t size)
+{
+	const uint8_t *tempa = a;
+	const uint8_t *tempb = b;
+	uint8_t result = 0;
+
+	for (unsigned int i = 0; i < size; i++) {
+		result |= tempa[i] ^ tempb[i];
+	}
+	return result;
+}