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+/**
+ * \file psa/crypto_platform.h
+ *
+ * \brief PSA cryptography module: Mbed TLS platform definitions
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h.
+ *
+ * This file contains platform-dependent type definitions.
+ *
+ * In implementations with isolation between the application and the
+ * cryptography module, implementers should take care to ensure that
+ * the definitions that are exposed to applications match what the
+ * module implements.
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef PSA_CRYPTO_PLATFORM_H
+#define PSA_CRYPTO_PLATFORM_H
+#include "mbedtls/private_access.h"
+
+/*
+ * Include the build-time configuration information file. Here, we do not
+ * include `"mbedtls/build_info.h"` directly but `"psa/build_info.h"`, which
+ * is basically just an alias to it. This is to ease the maintenance of the
+ * PSA cryptography repository which has a different build system and
+ * configuration.
+ */
+#include "psa/build_info.h"
+
+/* PSA requires several types which C99 provides in stdint.h. */
+#include <stdint.h>
+
+#if defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER)
+
+/* Building for the PSA Crypto service on a PSA platform, a key owner is a PSA
+ * partition identifier.
+ *
+ * The function psa_its_identifier_of_slot() in psa_crypto_storage.c that
+ * translates a key identifier to a key storage file name assumes that
+ * mbedtls_key_owner_id_t is a 32-bit integer. This function thus needs
+ * reworking if mbedtls_key_owner_id_t is not defined as a 32-bit integer
+ * here anymore.
+ */
+typedef int32_t mbedtls_key_owner_id_t;
+
+/** Compare two key owner identifiers.
+ *
+ * \param id1 First key owner identifier.
+ * \param id2 Second key owner identifier.
+ *
+ * \return Non-zero if the two key owner identifiers are equal, zero otherwise.
+ */
+static inline int mbedtls_key_owner_id_equal(mbedtls_key_owner_id_t id1,
+                                             mbedtls_key_owner_id_t id2)
+{
+    return id1 == id2;
+}
+
+#endif /* MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER */
+
+/*
+ * When MBEDTLS_PSA_CRYPTO_SPM is defined, the code is being built for SPM
+ * (Secure Partition Manager) integration which separates the code into two
+ * parts: NSPE (Non-Secure Processing Environment) and SPE (Secure Processing
+ * Environment). When building for the SPE, an additional header file should be
+ * included.
+ */
+#if defined(MBEDTLS_PSA_CRYPTO_SPM)
+#define PSA_CRYPTO_SECURE 1
+#include "crypto_spe.h"
+#endif // MBEDTLS_PSA_CRYPTO_SPM
+
+#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
+/** The type of the context passed to mbedtls_psa_external_get_random().
+ *
+ * Mbed TLS initializes the context to all-bits-zero before calling
+ * mbedtls_psa_external_get_random() for the first time.
+ *
+ * The definition of this type in the Mbed TLS source code is for
+ * demonstration purposes. Implementers of mbedtls_psa_external_get_random()
+ * are expected to replace it with a custom definition.
+ */
+typedef struct {
+    uintptr_t MBEDTLS_PRIVATE(opaque)[2];
+} mbedtls_psa_external_random_context_t;
+#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
+
+#endif /* PSA_CRYPTO_PLATFORM_H */