Import Mbed OS hard-float snapshot

connectivity/drivers/mbedtls/TARGET_STM/sha256_alt.h

@@ -0,0 +1,60 @@
+/**
+ * \file sha256.h
+ *
+ * \brief This file contains SHA-224 and SHA-256 definitions and functions.
+ *
+ * The Secure Hash Algorithms 224 and 256 (SHA-224 and SHA-256) cryptographic
+ * hash functions are defined in <em>FIPS 180-4: Secure Hash Standard (SHS)</em>.
+ */
+/*
+ *  Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
+ *  Copyright (C) 2019-2020, STMicroelectronics, All Rights Reserved
+ *  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.
+ *
+ *  This file implements STMicroelectronics SHA256 API with HW services based
+ *  on mbed TLS API
+ */
+
+#ifndef MBEDTLS_SHA256_ALT_H
+#define MBEDTLS_SHA256_ALT_H
+
+#if defined (MBEDTLS_SHA256_ALT)
+/* Includes ------------------------------------------------------------------*/
+#include "hash_stm32.h"
+
+#define ST_SHA256_BLOCK_SIZE  ((size_t)  64)        /*!< HW handles 512 bits, ie 64 bytes */
+#define ST_SHA256_NB_HASH_REG ((uint32_t)57)        /*!< Number of HASH HW context Registers:
+                                                         CR + STR + IMR + CSR[54] */
+
+/**
+ * \brief          SHA-256 context structure
+ *
+ *                 The structure is used both for SHA-256 and for SHA-224
+ *                 checksum calculations. The choice between these two is
+ *                 made in the call to mbedtls_sha256_starts_ret().
+ */
+typedef struct mbedtls_sha256_context {
+    int is224;                                      /*!< 0 = use SHA256, 1 = use SHA224 */
+    HASH_HandleTypeDef hhash;                       /*!< Handle of HASH HAL */
+    uint8_t sbuf[ST_SHA256_BLOCK_SIZE];             /*!< Buffer to store input data until ST_SHA256_BLOCK_SIZE
+                                                         is reached, or until last input data is reached */
+    uint8_t sbuf_len;                               /*!< Number of bytes stored in sbuf */
+    uint32_t ctx_save_regs[ST_SHA256_NB_HASH_REG];
+}
+mbedtls_sha256_context;
+
+
+#endif /* MBEDTLS_SHA256_ALT */
+#endif /* MBEDTLS_SHA256_ALT_H */