diff --git a/include/mbedcrypto/xtea.h b/include/mbedcrypto/xtea.h
new file mode 100644
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+++ b/include/mbedcrypto/xtea.h
@@ -0,0 +1,133 @@
+/**
+ * \file xtea.h
+ *
+ * \brief XTEA block cipher (32-bit)
+ */
+/*
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  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.
+ *
+ *  This file is part of Mbed Crypto (https://tls.mbed.org)
+ */
+#ifndef MBEDCRYPTO_XTEA_H
+#define MBEDCRYPTO_XTEA_H
+
+#if !defined(MBEDCRYPTO_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDCRYPTO_CONFIG_FILE
+#endif
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define MBEDCRYPTO_XTEA_ENCRYPT     1
+#define MBEDCRYPTO_XTEA_DECRYPT     0
+
+#define MBEDCRYPTO_ERR_XTEA_INVALID_INPUT_LENGTH             -0x0028  /**< The data input has an invalid length. */
+#define MBEDCRYPTO_ERR_XTEA_HW_ACCEL_FAILED                  -0x0029  /**< XTEA hardware accelerator failed. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDCRYPTO_XTEA_ALT)
+// Regular implementation
+//
+
+/**
+ * \brief          XTEA context structure
+ */
+typedef struct
+{
+    uint32_t k[4];       /*!< key */
+}
+mbedcrypto_xtea_context;
+
+#else  /* MBEDCRYPTO_XTEA_ALT */
+#include "xtea_alt.h"
+#endif /* MBEDCRYPTO_XTEA_ALT */
+
+/**
+ * \brief          Initialize XTEA context
+ *
+ * \param ctx      XTEA context to be initialized
+ */
+void mbedcrypto_xtea_init( mbedcrypto_xtea_context *ctx );
+
+/**
+ * \brief          Clear XTEA context
+ *
+ * \param ctx      XTEA context to be cleared
+ */
+void mbedcrypto_xtea_free( mbedcrypto_xtea_context *ctx );
+
+/**
+ * \brief          XTEA key schedule
+ *
+ * \param ctx      XTEA context to be initialized
+ * \param key      the secret key
+ */
+void mbedcrypto_xtea_setup( mbedcrypto_xtea_context *ctx, const unsigned char key[16] );
+
+/**
+ * \brief          XTEA cipher function
+ *
+ * \param ctx      XTEA context
+ * \param mode     MBEDCRYPTO_XTEA_ENCRYPT or MBEDCRYPTO_XTEA_DECRYPT
+ * \param input    8-byte input block
+ * \param output   8-byte output block
+ *
+ * \return         0 if successful
+ */
+int mbedcrypto_xtea_crypt_ecb( mbedcrypto_xtea_context *ctx,
+                    int mode,
+                    const unsigned char input[8],
+                    unsigned char output[8] );
+
+#if defined(MBEDCRYPTO_CIPHER_MODE_CBC)
+/**
+ * \brief          XTEA CBC cipher function
+ *
+ * \param ctx      XTEA context
+ * \param mode     MBEDCRYPTO_XTEA_ENCRYPT or MBEDCRYPTO_XTEA_DECRYPT
+ * \param length   the length of input, multiple of 8
+ * \param iv       initialization vector for CBC mode
+ * \param input    input block
+ * \param output   output block
+ *
+ * \return         0 if successful,
+ *                 MBEDCRYPTO_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0
+ */
+int mbedcrypto_xtea_crypt_cbc( mbedcrypto_xtea_context *ctx,
+                    int mode,
+                    size_t length,
+                    unsigned char iv[8],
+                    const unsigned char *input,
+                    unsigned char *output);
+#endif /* MBEDCRYPTO_CIPHER_MODE_CBC */
+
+/**
+ * \brief          Checkup routine
+ *
+ * \return         0 if successful, or 1 if the test failed
+ */
+int mbedcrypto_xtea_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* xtea.h */