Import Mbed OS hard-float snapshot

connectivity/nanostack/sal-stack-nanostack/source/Service_Libs/hmac/hmac_sha1.h

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+/*
+ * Copyright (c) 2016-2018, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HMAC_SHA1_
+#define HMAC_SHA1_
+
+/**
+ * \brief Calculate HMAC-SHA1-160
+ *
+ *  Calculate HMAC-SHA1-160
+ *
+ * \param key pointer to key
+ * \param key_len key length
+ * \param data pointer to data
+ * \param data_len data length
+ * \param result pointer to result
+ * \param result_len in bytes, maximum is 20 bytes
+ *
+ * \return < 0 failure
+ * \return >= 0 success
+ *
+ */
+int8_t hmac_sha1_calc(const uint8_t *key, uint16_t key_len, const uint8_t *data, uint16_t data_len, uint8_t *result, uint8_t result_len);
+
+#endif /* HMAC_SHA1_ */