diff --git a/library/entropy.c b/library/entropy.c
index deda97c..1ac4cf5 100644
--- a/library/entropy.c
+++ b/library/entropy.c
@@ -28,7 +28,7 @@
 #endif
 
 #include "mbedtls/entropy.h"
-#include "mbedtls/entropy_poll.h"
+#include "entropy_poll.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/error.h"
 
diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index a3200d9..4fbe1ee 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -29,7 +29,7 @@
 #if defined(MBEDTLS_ENTROPY_C)
 
 #include "mbedtls/entropy.h"
-#include "mbedtls/entropy_poll.h"
+#include "entropy_poll.h"
 #include "mbedtls/error.h"
 
 #if defined(MBEDTLS_TIMING_C)
diff --git a/library/entropy_poll.h b/library/entropy_poll.h
new file mode 100644
index 0000000..e12a134
--- /dev/null
+++ b/library/entropy_poll.h
@@ -0,0 +1,97 @@
+/**
+ * \file entropy_poll.h
+ *
+ * \brief Platform-specific and custom entropy polling functions
+ */
+/*
+ *  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_ENTROPY_POLL_H
+#define MBEDTLS_ENTROPY_POLL_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Default thresholds for built-in sources, in bytes
+ */
+#define MBEDTLS_ENTROPY_MIN_PLATFORM     32     /**< Minimum for platform source    */
+#define MBEDTLS_ENTROPY_MIN_HARDCLOCK     4     /**< Minimum for mbedtls_timing_hardclock()        */
+#if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE)
+#define MBEDTLS_ENTROPY_MIN_HARDWARE     32     /**< Minimum for the hardware source */
+#endif
+
+/**
+ * \brief           Entropy poll callback that provides 0 entropy.
+ */
+#if defined(MBEDTLS_TEST_NULL_ENTROPY)
+    int mbedtls_null_entropy_poll( void *data,
+                                unsigned char *output, size_t len, size_t *olen );
+#endif
+
+#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
+/**
+ * \brief           Platform-specific entropy poll callback
+ */
+int mbedtls_platform_entropy_poll( void *data,
+                           unsigned char *output, size_t len, size_t *olen );
+#endif
+
+#if defined(MBEDTLS_TIMING_C)
+/**
+ * \brief           mbedtls_timing_hardclock-based entropy poll callback
+ */
+int mbedtls_hardclock_poll( void *data,
+                    unsigned char *output, size_t len, size_t *olen );
+#endif
+
+#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
+/**
+ * \brief           Entropy poll callback for a hardware source
+ *
+ * \warning         This is not provided by mbed TLS!
+ *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
+ *
+ * \note            This must accept NULL as its first argument.
+ */
+int mbedtls_hardware_poll( void *data,
+                           unsigned char *output, size_t len, size_t *olen );
+#endif
+
+#if defined(MBEDTLS_ENTROPY_NV_SEED)
+/**
+ * \brief           Entropy poll callback for a non-volatile seed file
+ *
+ * \note            This must accept NULL as its first argument.
+ */
+int mbedtls_nv_seed_poll( void *data,
+                          unsigned char *output, size_t len, size_t *olen );
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* entropy_poll.h */
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 5c0e84c..91e5643 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -6482,7 +6482,7 @@
 #endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
 
 #if defined(MBEDTLS_PSA_INJECT_ENTROPY)
-#include "mbedtls/entropy_poll.h"
+#include "entropy_poll.h"
 
 psa_status_t mbedtls_psa_inject_entropy( const uint8_t *seed,
                                          size_t seed_size )