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+/**
+ * \file ccm.h
+ *
+ * \brief This file provides an API for the CCM authenticated encryption
+ *        mode for block ciphers.
+ *
+ * CCM combines Counter mode encryption with CBC-MAC authentication
+ * for 128-bit block ciphers.
+ *
+ * Input to CCM includes the following elements:
+ * <ul><li>Payload - data that is both authenticated and encrypted.</li>
+ * <li>Associated data (Adata) - data that is authenticated but not
+ * encrypted, For example, a header.</li>
+ * <li>Nonce - A unique value that is assigned to the payload and the
+ * associated data.</li></ul>
+ *
+ * Definition of CCM:
+ * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
+ * RFC 3610 "Counter with CBC-MAC (CCM)"
+ *
+ * Related:
+ * RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
+ *
+ * Definition of CCM*:
+ * IEEE 802.15.4 - IEEE Standard for Local and metropolitan area networks
+ * Integer representation is fixed most-significant-octet-first order and
+ * the representation of octets is most-significant-bit-first order. This is
+ * consistent with RFC 3610.
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef MBEDTLS_CCM_H
+#define MBEDTLS_CCM_H
+#include "mbedtls/private_access.h"
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/cipher.h"
+
+#define MBEDTLS_CCM_DECRYPT       0
+#define MBEDTLS_CCM_ENCRYPT       1
+#define MBEDTLS_CCM_STAR_DECRYPT  2
+#define MBEDTLS_CCM_STAR_ENCRYPT  3
+
+/** Bad input parameters to the function. */
+#define MBEDTLS_ERR_CCM_BAD_INPUT       -0x000D
+/** Authenticated decryption failed. */
+#define MBEDTLS_ERR_CCM_AUTH_FAILED     -0x000F
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDTLS_CCM_ALT)
+// Regular implementation
+//
+
+/**
+ * \brief    The CCM context-type definition. The CCM context is passed
+ *           to the APIs called.
+ */
+typedef struct mbedtls_ccm_context {
+    unsigned char MBEDTLS_PRIVATE(y)[16];    /*!< The Y working buffer */
+    unsigned char MBEDTLS_PRIVATE(ctr)[16];  /*!< The counter buffer */
+    size_t MBEDTLS_PRIVATE(plaintext_len);   /*!< Total plaintext length */
+    size_t MBEDTLS_PRIVATE(add_len);         /*!< Total authentication data length */
+    size_t MBEDTLS_PRIVATE(tag_len);         /*!< Total tag length */
+    size_t MBEDTLS_PRIVATE(processed);       /*!< Track how many bytes of input data
+                                                  were processed (chunked input).
+                                                  Used independently for both auth data
+                                                  and plaintext/ciphertext.
+                                                  This variable is set to zero after
+                                                  auth data input is finished. */
+    unsigned int MBEDTLS_PRIVATE(q);         /*!< The Q working value */
+    unsigned int MBEDTLS_PRIVATE(mode);      /*!< The operation to perform:
+                                              #MBEDTLS_CCM_ENCRYPT or
+                                              #MBEDTLS_CCM_DECRYPT or
+                                              #MBEDTLS_CCM_STAR_ENCRYPT or
+                                              #MBEDTLS_CCM_STAR_DECRYPT. */
+    mbedtls_cipher_context_t MBEDTLS_PRIVATE(cipher_ctx);    /*!< The cipher context used. */
+    int MBEDTLS_PRIVATE(state);              /*!< Working value holding context's
+                                                  state. Used for chunked data input */
+}
+mbedtls_ccm_context;
+
+#else  /* MBEDTLS_CCM_ALT */
+#include "ccm_alt.h"
+#endif /* MBEDTLS_CCM_ALT */
+
+/**
+ * \brief           This function initializes the specified CCM context,
+ *                  to make references valid, and prepare the context
+ *                  for mbedtls_ccm_setkey() or mbedtls_ccm_free().
+ *
+ * \param ctx       The CCM context to initialize. This must not be \c NULL.
+ */
+void mbedtls_ccm_init(mbedtls_ccm_context *ctx);
+
+/**
+ * \brief           This function initializes the CCM context set in the
+ *                  \p ctx parameter and sets the encryption key.
+ *
+ * \param ctx       The CCM context to initialize. This must be an initialized
+ *                  context.
+ * \param cipher    The 128-bit block cipher to use.
+ * \param key       The encryption key. This must not be \c NULL.
+ * \param keybits   The key size in bits. This must be acceptable by the cipher.
+ *
+ * \return          \c 0 on success.
+ * \return          A CCM or cipher-specific error code on failure.
+ */
+int mbedtls_ccm_setkey(mbedtls_ccm_context *ctx,
+                       mbedtls_cipher_id_t cipher,
+                       const unsigned char *key,
+                       unsigned int keybits);
+
+/**
+ * \brief   This function releases and clears the specified CCM context
+ *          and underlying cipher sub-context.
+ *
+ * \param ctx       The CCM context to clear. If this is \c NULL, the function
+ *                  has no effect. Otherwise, this must be initialized.
+ */
+void mbedtls_ccm_free(mbedtls_ccm_context *ctx);
+
+/**
+ * \brief           This function encrypts a buffer using CCM.
+ *
+ * \note            The tag is written to a separate buffer. To concatenate
+ *                  the \p tag with the \p output, as done in <em>RFC-3610:
+ *                  Counter with CBC-MAC (CCM)</em>, use
+ *                  \p tag = \p output + \p length, and make sure that the
+ *                  output buffer is at least \p length + \p tag_len wide.
+ *
+ * \param ctx       The CCM context to use for encryption. This must be
+ *                  initialized and bound to a key.
+ * \param length    The length of the input data in Bytes.
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
+ * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
+ *                  or 13. The length L of the message length field is
+ *                  15 - \p iv_len.
+ * \param ad        The additional data field. If \p ad_len is greater than
+ *                  zero, \p ad must be a readable buffer of at least that
+ *                  length.
+ * \param ad_len    The length of additional data in Bytes.
+ *                  This must be less than `2^16 - 2^8`.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  writable buffer of at least \p tag_len Bytes.
+ * \param tag_len   The length of the authentication field to generate in Bytes:
+ *                  4, 6, 8, 10, 12, 14 or 16.
+ *
+ * \return          \c 0 on success.
+ * \return          A CCM or cipher-specific error code on failure.
+ */
+int mbedtls_ccm_encrypt_and_tag(mbedtls_ccm_context *ctx, size_t length,
+                                const unsigned char *iv, size_t iv_len,
+                                const unsigned char *ad, size_t ad_len,
+                                const unsigned char *input, unsigned char *output,
+                                unsigned char *tag, size_t tag_len);
+
+/**
+ * \brief           This function encrypts a buffer using CCM*.
+ *
+ * \note            The tag is written to a separate buffer. To concatenate
+ *                  the \p tag with the \p output, as done in <em>RFC-3610:
+ *                  Counter with CBC-MAC (CCM)</em>, use
+ *                  \p tag = \p output + \p length, and make sure that the
+ *                  output buffer is at least \p length + \p tag_len wide.
+ *
+ * \note            When using this function in a variable tag length context,
+ *                  the tag length has to be encoded into the \p iv passed to
+ *                  this function.
+ *
+ * \param ctx       The CCM context to use for encryption. This must be
+ *                  initialized and bound to a key.
+ * \param length    The length of the input data in Bytes.
+ *                  For tag length = 0, input length is ignored.
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
+ * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
+ *                  or 13. The length L of the message length field is
+ *                  15 - \p iv_len.
+ * \param ad        The additional data field. This must be a readable buffer of
+ *                  at least \p ad_len Bytes.
+ * \param ad_len    The length of additional data in Bytes.
+ *                  This must be less than 2^16 - 2^8.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  writable buffer of at least \p tag_len Bytes.
+ * \param tag_len   The length of the authentication field to generate in Bytes:
+ *                  0, 4, 6, 8, 10, 12, 14 or 16.
+ *
+ * \warning         Passing \c 0 as \p tag_len means that the message is no
+ *                  longer authenticated.
+ *
+ * \return          \c 0 on success.
+ * \return          A CCM or cipher-specific error code on failure.
+ */
+int mbedtls_ccm_star_encrypt_and_tag(mbedtls_ccm_context *ctx, size_t length,
+                                     const unsigned char *iv, size_t iv_len,
+                                     const unsigned char *ad, size_t ad_len,
+                                     const unsigned char *input, unsigned char *output,
+                                     unsigned char *tag, size_t tag_len);
+
+/**
+ * \brief           This function performs a CCM authenticated decryption of a
+ *                  buffer.
+ *
+ * \param ctx       The CCM context to use for decryption. This must be
+ *                  initialized and bound to a key.
+ * \param length    The length of the input data in Bytes.
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
+ * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
+ *                  or 13. The length L of the message length field is
+ *                  15 - \p iv_len.
+ * \param ad        The additional data field. This must be a readable buffer
+ *                  of at least that \p ad_len Bytes..
+ * \param ad_len    The length of additional data in Bytes.
+ *                  This must be less than 2^16 - 2^8.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
+ * \param tag_len   The length of the authentication field to generate in Bytes:
+ *                  4, 6, 8, 10, 12, 14 or 16.
+ *
+ * \return          \c 0 on success. This indicates that the message is authentic.
+ * \return          #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match.
+ * \return          A cipher-specific error code on calculation failure.
+ */
+int mbedtls_ccm_auth_decrypt(mbedtls_ccm_context *ctx, size_t length,
+                             const unsigned char *iv, size_t iv_len,
+                             const unsigned char *ad, size_t ad_len,
+                             const unsigned char *input, unsigned char *output,
+                             const unsigned char *tag, size_t tag_len);
+
+/**
+ * \brief           This function performs a CCM* authenticated decryption of a
+ *                  buffer.
+ *
+ * \note            When using this function in a variable tag length context,
+ *                  the tag length has to be decoded from \p iv and passed to
+ *                  this function as \p tag_len. (\p tag needs to be adjusted
+ *                  accordingly.)
+ *
+ * \param ctx       The CCM context to use for decryption. This must be
+ *                  initialized and bound to a key.
+ * \param length    The length of the input data in Bytes.
+ *                  For tag length = 0, input length is ignored.
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
+ * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
+ *                  or 13. The length L of the message length field is
+ *                  15 - \p iv_len.
+ * \param ad        The additional data field. This must be a readable buffer of
+ *                  at least that \p ad_len Bytes.
+ * \param ad_len    The length of additional data in Bytes.
+ *                  This must be less than 2^16 - 2^8.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
+ * \param tag_len   The length of the authentication field in Bytes.
+ *                  0, 4, 6, 8, 10, 12, 14 or 16.
+ *
+ * \warning         Passing \c 0 as \p tag_len means that the message is nos
+ *                  longer authenticated.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match.
+ * \return          A cipher-specific error code on calculation failure.
+ */
+int mbedtls_ccm_star_auth_decrypt(mbedtls_ccm_context *ctx, size_t length,
+                                  const unsigned char *iv, size_t iv_len,
+                                  const unsigned char *ad, size_t ad_len,
+                                  const unsigned char *input, unsigned char *output,
+                                  const unsigned char *tag, size_t tag_len);
+
+/**
+ * \brief           This function starts a CCM encryption or decryption
+ *                  operation.
+ *
+ *                  This function and mbedtls_ccm_set_lengths() must be called
+ *                  before calling mbedtls_ccm_update_ad() or
+ *                  mbedtls_ccm_update(). This function can be called before
+ *                  or after mbedtls_ccm_set_lengths().
+ *
+ * \note            This function is not implemented in Mbed TLS yet.
+ *
+ * \param ctx       The CCM context. This must be initialized.
+ * \param mode      The operation to perform: #MBEDTLS_CCM_ENCRYPT or
+ *                  #MBEDTLS_CCM_DECRYPT or #MBEDTLS_CCM_STAR_ENCRYPT or
+ *                  #MBEDTLS_CCM_STAR_DECRYPT.
+ * \param iv        The initialization vector. This must be a readable buffer
+ *                  of at least \p iv_len Bytes.
+ * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
+ *                  or 13. The length L of the message length field is
+ *                  15 - \p iv_len.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
+ *                  \p ctx is in an invalid state,
+ *                  \p mode is invalid,
+ *                  \p iv_len is invalid (lower than \c 7 or greater than
+ *                  \c 13).
+ */
+int mbedtls_ccm_starts(mbedtls_ccm_context *ctx,
+                       int mode,
+                       const unsigned char *iv,
+                       size_t iv_len);
+
+/**
+ * \brief           This function declares the lengths of the message
+ *                  and additional data for a CCM encryption or decryption
+ *                  operation.
+ *
+ *                  This function and mbedtls_ccm_starts() must be called
+ *                  before calling mbedtls_ccm_update_ad() or
+ *                  mbedtls_ccm_update(). This function can be called before
+ *                  or after mbedtls_ccm_starts().
+ *
+ * \note            This function is not implemented in Mbed TLS yet.
+ *
+ * \param ctx       The CCM context. This must be initialized.
+ * \param total_ad_len   The total length of additional data in bytes.
+ *                       This must be less than `2^16 - 2^8`.
+ * \param plaintext_len  The length in bytes of the plaintext to encrypt or
+ *                       result of the decryption (thus not encompassing the
+ *                       additional data that are not encrypted).
+ * \param tag_len   The length of the tag to generate in Bytes:
+ *                  4, 6, 8, 10, 12, 14 or 16.
+ *                  For CCM*, zero is also valid.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
+ *                  \p ctx is in an invalid state,
+ *                  \p total_ad_len is greater than \c 0xFF00.
+ */
+int mbedtls_ccm_set_lengths(mbedtls_ccm_context *ctx,
+                            size_t total_ad_len,
+                            size_t plaintext_len,
+                            size_t tag_len);
+
+/**
+ * \brief           This function feeds an input buffer as associated data
+ *                  (authenticated but not encrypted data) in a CCM
+ *                  encryption or decryption operation.
+ *
+ *                  You may call this function zero, one or more times
+ *                  to pass successive parts of the additional data. The
+ *                  lengths \p ad_len of the data parts should eventually add
+ *                  up exactly to the total length of additional data
+ *                  \c total_ad_len passed to mbedtls_ccm_set_lengths(). You
+ *                  may not call this function after calling
+ *                  mbedtls_ccm_update().
+ *
+ * \note            This function is not implemented in Mbed TLS yet.
+ *
+ * \param ctx       The CCM context. This must have been started with
+ *                  mbedtls_ccm_starts(), the lengths of the message and
+ *                  additional data must have been declared with
+ *                  mbedtls_ccm_set_lengths() and this must not have yet
+ *                  received any input with mbedtls_ccm_update().
+ * \param ad        The buffer holding the additional data, or \c NULL
+ *                  if \p ad_len is \c 0.
+ * \param ad_len    The length of the additional data. If \c 0,
+ *                  \p ad may be \c NULL.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
+ *                  \p ctx is in an invalid state,
+ *                  total input length too long.
+ */
+int mbedtls_ccm_update_ad(mbedtls_ccm_context *ctx,
+                          const unsigned char *ad,
+                          size_t ad_len);
+
+/**
+ * \brief           This function feeds an input buffer into an ongoing CCM
+ *                  encryption or decryption operation.
+ *
+ *                  You may call this function zero, one or more times
+ *                  to pass successive parts of the input: the plaintext to
+ *                  encrypt, or the ciphertext (not including the tag) to
+ *                  decrypt. After the last part of the input, call
+ *                  mbedtls_ccm_finish(). The lengths \p input_len of the
+ *                  data parts should eventually add up exactly to the
+ *                  plaintext length \c plaintext_len passed to
+ *                  mbedtls_ccm_set_lengths().
+ *
+ *                  This function may produce output in one of the following
+ *                  ways:
+ *                  - Immediate output: the output length is always equal
+ *                    to the input length.
+ *                  - Buffered output: except for the last part of input data,
+ *                    the output consists of a whole number of 16-byte blocks.
+ *                    If the total input length so far (not including
+ *                    associated data) is 16 \* *B* + *A* with *A* < 16 then
+ *                    the total output length is 16 \* *B*.
+ *                    For the last part of input data, the output length is
+ *                    equal to the input length plus the number of bytes (*A*)
+ *                    buffered in the previous call to the function (if any).
+ *                    The function uses the plaintext length
+ *                    \c plaintext_len passed to mbedtls_ccm_set_lengths()
+ *                    to detect the last part of input data.
+ *
+ *                  In particular:
+ *                  - It is always correct to call this function with
+ *                    \p output_size >= \p input_len + 15.
+ *                  - If \p input_len is a multiple of 16 for all the calls
+ *                    to this function during an operation (not necessary for
+ *                    the last one) then it is correct to use \p output_size
+ *                    =\p input_len.
+ *
+ * \note            This function is not implemented in Mbed TLS yet.
+ *
+ * \param ctx           The CCM context. This must have been started with
+ *                      mbedtls_ccm_starts() and the lengths of the message and
+ *                      additional data must have been declared with
+ *                      mbedtls_ccm_set_lengths().
+ * \param input         The buffer holding the input data. If \p input_len
+ *                      is greater than zero, this must be a readable buffer
+ *                      of at least \p input_len bytes.
+ * \param input_len     The length of the input data in bytes.
+ * \param output        The buffer for the output data. If \p output_size
+ *                      is greater than zero, this must be a writable buffer of
+ *                      at least \p output_size bytes.
+ * \param output_size   The size of the output buffer in bytes.
+ *                      See the function description regarding the output size.
+ * \param output_len    On success, \p *output_len contains the actual
+ *                      length of the output written in \p output.
+ *                      On failure, the content of \p *output_len is
+ *                      unspecified.
+ *
+ * \return         \c 0 on success.
+ * \return         #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
+ *                 \p ctx is in an invalid state,
+ *                 total input length too long,
+ *                 or \p output_size too small.
+ */
+int mbedtls_ccm_update(mbedtls_ccm_context *ctx,
+                       const unsigned char *input, size_t input_len,
+                       unsigned char *output, size_t output_size,
+                       size_t *output_len);
+
+/**
+ * \brief           This function finishes the CCM operation and generates
+ *                  the authentication tag.
+ *
+ *                  It wraps up the CCM stream, and generates the
+ *                  tag. The tag can have a maximum length of 16 Bytes.
+ *
+ * \note            This function is not implemented in Mbed TLS yet.
+ *
+ * \param ctx       The CCM context. This must have been started with
+ *                  mbedtls_ccm_starts() and the lengths of the message and
+ *                  additional data must have been declared with
+ *                  mbedtls_ccm_set_lengths().
+ * \param tag       The buffer for holding the tag. If \p tag_len is greater
+ *                  than zero, this must be a writable buffer of at least \p
+ *                  tag_len Bytes.
+ * \param tag_len   The length of the tag. Must match the tag length passed to
+ *                  mbedtls_ccm_set_lengths() function.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CCM_BAD_INPUT on failure:
+ *                  \p ctx is in an invalid state,
+ *                  invalid value of \p tag_len,
+ *                  the total amount of additional data passed to
+ *                  mbedtls_ccm_update_ad() was lower than the total length of
+ *                  additional data \c total_ad_len passed to
+ *                  mbedtls_ccm_set_lengths(),
+ *                  the total amount of input data passed to
+ *                  mbedtls_ccm_update() was lower than the plaintext length
+ *                  \c plaintext_len passed to mbedtls_ccm_set_lengths().
+ */
+int mbedtls_ccm_finish(mbedtls_ccm_context *ctx,
+                       unsigned char *tag, size_t tag_len);
+
+#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
+/**
+ * \brief          The CCM checkup routine.
+ *
+ * \return         \c 0 on success.
+ * \return         \c 1 on failure.
+ */
+int mbedtls_ccm_self_test(int verbose);
+#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MBEDTLS_CCM_H */