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@@ -0,0 +1,28 @@
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+/**
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+ * Mbedtls entropy_poll.h file
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+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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+ *
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+ * SPDX-License-Identifier: Apache-2.0
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+ */
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+#ifndef MBEDTLS_ENTROPY_POLL_H
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+#define MBEDTLS_ENTROPY_POLL_H
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+#include "mbedtls/build_info.h"
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+#include <stddef.h>
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+#ifdef __cplusplus
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+extern "C" {
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+#endif
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+
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+/**
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+ * \brief Entropy poll callback for a hardware source
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+ *
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+ *
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+ * \note This must accept NULL as its first argument.
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+ */
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+int mbedtls_hardware_poll( void *data,
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+ unsigned char *output, size_t len, size_t *olen );
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+
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+#ifdef __cplusplus
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+}
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+#endif
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+
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+#endif /* entropy_poll.h */
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