mbedtls 2.26.0

common/mbedtls/havege.h

@@ -0,0 +1,80 @@
+/**
+ * \file havege.h
+ *
+ * \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  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 MBEDTLS_HAVEGE_H
+#define MBEDTLS_HAVEGE_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief          HAVEGE state structure
+ */
+typedef struct mbedtls_havege_state
+{
+    uint32_t PT1, PT2, offset[2];
+    uint32_t pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
+    uint32_t WALK[8192];
+}
+mbedtls_havege_state;
+
+/**
+ * \brief          HAVEGE initialization
+ *
+ * \param hs       HAVEGE state to be initialized
+ */
+void mbedtls_havege_init( mbedtls_havege_state *hs );
+
+/**
+ * \brief          Clear HAVEGE state
+ *
+ * \param hs       HAVEGE state to be cleared
+ */
+void mbedtls_havege_free( mbedtls_havege_state *hs );
+
+/**
+ * \brief          HAVEGE rand function
+ *
+ * \param p_rng    A HAVEGE state
+ * \param output   Buffer to fill
+ * \param len      Length of buffer
+ *
+ * \return         0
+ */
+int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* havege.h */