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diff --git a/tf-psa-crypto/core/psa_util_internal.h b/tf-psa-crypto/core/psa_util_internal.h
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+++ b/tf-psa-crypto/core/psa_util_internal.h
@@ -0,0 +1,100 @@
+/**
+ * \file psa_util_internal.h
+ *
+ * \brief Internal utility functions for use of PSA Crypto.
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef MBEDTLS_PSA_UTIL_INTERNAL_H
+#define MBEDTLS_PSA_UTIL_INTERNAL_H
+
+/* Include the public header so that users only need one include. */
+#include "mbedtls/psa_util.h"
+
+#include "psa/crypto.h"
+
+#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
+
+/*************************************************************************
+ * FFDH
+ ************************************************************************/
+
+#define MBEDTLS_PSA_MAX_FFDH_PUBKEY_LENGTH \
+    PSA_KEY_EXPORT_FFDH_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS)
+
+/*************************************************************************
+ * ECC
+ ************************************************************************/
+
+#define MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH \
+    PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
+
+#define MBEDTLS_PSA_MAX_EC_KEY_PAIR_LENGTH \
+    PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
+
+/*************************************************************************
+ * Error translation
+ ************************************************************************/
+
+typedef struct {
+    /* Error codes used by PSA crypto are in -255..-128, fitting in 16 bits. */
+    int16_t psa_status;
+    /* Error codes used by Mbed TLS are in one of the ranges
+     * -127..-1 (low-level) or -32767..-4096 (high-level with a low-level
+     * code optionally added), fitting in 16 bits. */
+    int16_t mbedtls_error;
+} mbedtls_error_pair_t;
+
+#if defined(MBEDTLS_MD_LIGHT)
+extern const mbedtls_error_pair_t psa_to_md_errors[4];
+#endif
+
+#if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
+extern const mbedtls_error_pair_t psa_to_cipher_errors[4];
+#endif
+
+#if defined(MBEDTLS_LMS_C)
+extern const mbedtls_error_pair_t psa_to_lms_errors[3];
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)
+extern const mbedtls_error_pair_t psa_to_ssl_errors[7];
+#endif
+
+#if defined(PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY) ||    \
+    defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC)
+extern const mbedtls_error_pair_t psa_to_pk_rsa_errors[8];
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
+    defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY)
+extern const mbedtls_error_pair_t psa_to_pk_ecdsa_errors[7];
+#endif
+
+/* Generic fallback function for error translation,
+ * when the received state was not module-specific. */
+int psa_generic_status_to_mbedtls(psa_status_t status);
+
+/* This function iterates over provided local error translations,
+ * and if no match was found - calls the fallback error translation function. */
+int psa_status_to_mbedtls(psa_status_t status,
+                          const mbedtls_error_pair_t *local_translations,
+                          size_t local_errors_num,
+                          int (*fallback_f)(psa_status_t));
+
+/* The second out of three-stage error handling functions of the pk module,
+ * acts as a fallback after RSA / ECDSA error translation, and if no match
+ * is found, it itself calls psa_generic_status_to_mbedtls. */
+int psa_pk_status_to_mbedtls(psa_status_t status);
+
+/* Utility macro to shorten the defines of error translator in modules. */
+#define PSA_TO_MBEDTLS_ERR_LIST(status, error_list, fallback_f)       \
+    psa_status_to_mbedtls(status, error_list,                         \
+                          sizeof(error_list)/sizeof(error_list[0]),   \
+                          fallback_f)
+
+#endif /* MBEDTLS_PSA_CRYPTO_CLIENT */
+#endif /* MBEDTLS_PSA_UTIL_INTERNAL_H */