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diff --git a/common/mbedtls/pem.h b/common/mbedtls/pem.h
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+/**
+ * \file pem.h
+ *
+ * \brief Privacy Enhanced Mail (PEM) decoding
+ */
+/*
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: GPL-2.0
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#ifndef MBEDTLS_PEM_H
+#define MBEDTLS_PEM_H
+
+#include <stddef.h>
+
+/**
+ * \name PEM Error codes
+ * These error codes are returned in case of errors reading the
+ * PEM data.
+ * \{
+ */
+#define MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT          -0x1080  /**< No PEM header or footer found. */
+#define MBEDTLS_ERR_PEM_INVALID_DATA                      -0x1100  /**< PEM string is not as expected. */
+#define MBEDTLS_ERR_PEM_ALLOC_FAILED                      -0x1180  /**< Failed to allocate memory. */
+#define MBEDTLS_ERR_PEM_INVALID_ENC_IV                    -0x1200  /**< RSA IV is not in hex-format. */
+#define MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG                   -0x1280  /**< Unsupported key encryption algorithm. */
+#define MBEDTLS_ERR_PEM_PASSWORD_REQUIRED                 -0x1300  /**< Private key password can't be empty. */
+#define MBEDTLS_ERR_PEM_PASSWORD_MISMATCH                 -0x1380  /**< Given private key password does not allow for correct decryption. */
+#define MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE               -0x1400  /**< Unavailable feature, e.g. hashing/encryption combination. */
+#define MBEDTLS_ERR_PEM_BAD_INPUT_DATA                    -0x1480  /**< Bad input parameters to function. */
+/* \} name */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(MBEDTLS_PEM_PARSE_C)
+/**
+ * \brief       PEM context structure
+ */
+typedef struct mbedtls_pem_context
+{
+    unsigned char *buf;     /*!< buffer for decoded data             */
+    size_t buflen;          /*!< length of the buffer                */
+    unsigned char *info;    /*!< buffer for extra header information */
+}
+mbedtls_pem_context;
+
+/**
+ * \brief       PEM context setup
+ *
+ * \param ctx   context to be initialized
+ */
+void mbedtls_pem_init( mbedtls_pem_context *ctx );
+
+/**
+ * \brief       Read a buffer for PEM information and store the resulting
+ *              data into the specified context buffers.
+ *
+ * \param ctx       context to use
+ * \param header    header string to seek and expect
+ * \param footer    footer string to seek and expect
+ * \param data      source data to look in (must be nul-terminated)
+ * \param pwd       password for decryption (can be NULL)
+ * \param pwdlen    length of password
+ * \param use_len   destination for total length used (set after header is
+ *                  correctly read, so unless you get
+ *                  MBEDTLS_ERR_PEM_BAD_INPUT_DATA or
+ *                  MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT, use_len is
+ *                  the length to skip)
+ *
+ * \note            Attempts to check password correctness by verifying if
+ *                  the decrypted text starts with an ASN.1 sequence of
+ *                  appropriate length
+ *
+ * \return          0 on success, or a specific PEM error code
+ */
+int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
+                     const unsigned char *data,
+                     const unsigned char *pwd,
+                     size_t pwdlen, size_t *use_len );
+
+/**
+ * \brief       PEM context memory freeing
+ *
+ * \param ctx   context to be freed
+ */
+void mbedtls_pem_free( mbedtls_pem_context *ctx );
+#endif /* MBEDTLS_PEM_PARSE_C */
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+/**
+ * \brief           Write a buffer of PEM information from a DER encoded
+ *                  buffer.
+ *
+ * \param header    header string to write
+ * \param footer    footer string to write
+ * \param der_data  DER data to write
+ * \param der_len   length of the DER data
+ * \param buf       buffer to write to
+ * \param buf_len   length of output buffer
+ * \param olen      total length written / required (if buf_len is not enough)
+ *
+ * \return          0 on success, or a specific PEM or BASE64 error code. On
+ *                  MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL olen is the required
+ *                  size.
+ */
+int mbedtls_pem_write_buffer( const char *header, const char *footer,
+                      const unsigned char *der_data, size_t der_len,
+                      unsigned char *buf, size_t buf_len, size_t *olen );
+#endif /* MBEDTLS_PEM_WRITE_C */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* pem.h */