text: /**
   * \file psa/crypto_struct.h
   *
   * \brief PSA cryptography module: Mbed TLS structured type implementations
   *
   * \note This file may not be included directly. Applications must
   * include psa/crypto.h.
   *
   * This file contains the definitions of some data structures with
   * implementation-specific definitions.
   *
   * In implementations with isolation between the application and the
   * cryptography module, it is expected that the front-end and the back-end
   * would have different versions of this file.
   */
  /*
   *  Copyright (C) 2018, 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 TLS (https://tls.mbed.org)
   */
  
  #ifndef PSA_CRYPTO_STRUCT_H
  #define PSA_CRYPTO_STRUCT_H
  
  /* Include the Mbed TLS configuration file, the way Mbed TLS does it
   * in each of its header files. */
  #if !defined(MBEDTLS_CONFIG_FILE)
  #include "../mbedtls/config.h"
  #else
  #include MBEDTLS_CONFIG_FILE
  #endif
  
  #include "mbedtls/cipher.h"
  #include "mbedtls/cmac.h"
  #include "mbedtls/gcm.h"
  #include "mbedtls/md.h"
  #include "mbedtls/md2.h"
  #include "mbedtls/md4.h"
  #include "mbedtls/md5.h"
  #include "mbedtls/ripemd160.h"
  #include "mbedtls/sha1.h"
  #include "mbedtls/sha256.h"
  #include "mbedtls/sha512.h"
  
  struct psa_hash_operation_s
  {
      psa_algorithm_t alg;
      union
      {
          unsigned dummy; /* Make the union non-empty even with no supported algorithms. */
  #if defined(MBEDTLS_MD2_C)
          mbedtls_md2_context md2;
  #endif
  #if defined(MBEDTLS_MD4_C)
          mbedtls_md4_context md4;
  #endif
  #if defined(MBEDTLS_MD5_C)
          mbedtls_md5_context md5;
  #endif
  #if defined(MBEDTLS_RIPEMD160_C)
          mbedtls_ripemd160_context ripemd160;
  #endif
  #if defined(MBEDTLS_SHA1_C)
          mbedtls_sha1_context sha1;
  #endif
  #if defined(MBEDTLS_SHA256_C)
          mbedtls_sha256_context sha256;
  #endif
  #if defined(MBEDTLS_SHA512_C)
          mbedtls_sha512_context sha512;
  #endif
      } ctx;
  };
  
  #if defined(MBEDTLS_MD_C)
  typedef struct
  {
          /** The hash context. */
          struct psa_hash_operation_s hash_ctx;
          /** The HMAC part of the context. */
          uint8_t opad[PSA_HMAC_MAX_HASH_BLOCK_SIZE];
  } psa_hmac_internal_data;
  #endif /* MBEDTLS_MD_C */
  
  struct psa_mac_operation_s
  {
      psa_algorithm_t alg;
      unsigned int key_set : 1;
      unsigned int iv_required : 1;
      unsigned int iv_set : 1;
      unsigned int has_input : 1;
      unsigned int is_sign : 1;
      uint8_t mac_size;
      union
      {
          unsigned dummy; /* Make the union non-empty even with no supported algorithms. */
  #if defined(MBEDTLS_MD_C)
          psa_hmac_internal_data hmac;
  #endif
  #if defined(MBEDTLS_CMAC_C)
          mbedtls_cipher_context_t cmac;
  #endif
      } ctx;
  };
  
  struct psa_cipher_operation_s
  {
      psa_algorithm_t alg;
      unsigned int key_set : 1;
      unsigned int iv_required : 1;
      unsigned int iv_set : 1;
      uint8_t iv_size;
      uint8_t block_size;
      union
      {
          mbedtls_cipher_context_t cipher;
      } ctx;
  };
  
  #if defined(MBEDTLS_MD_C)
  typedef struct
  {
      uint8_t *info;
      size_t info_length;
      psa_hmac_internal_data hmac;
      uint8_t prk[PSA_HASH_MAX_SIZE];
      uint8_t output_block[PSA_HASH_MAX_SIZE];
  #if PSA_HASH_MAX_SIZE > 0xff
  #error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
  #endif
      uint8_t offset_in_block;
      uint8_t block_number;
  } psa_hkdf_generator_t;
  #endif /* MBEDTLS_MD_C */
  
  #if defined(MBEDTLS_MD_C)
  typedef struct psa_tls12_prf_generator_s
  {
      /* The TLS 1.2 PRF uses the key for each HMAC iteration,
       * hence we must store it for the lifetime of the generator.
       * This is different from HKDF, where the key is only used
       * in the extraction phase, but not during expansion. */
      unsigned char *key;
      size_t key_len;
  
      /* `A(i) + seed` in the notation of RFC 5246, Sect. 5 */
      uint8_t *Ai_with_seed;
      size_t Ai_with_seed_len;
  
      /* `HMAC_hash( prk, A(i) + seed )` in the notation of RFC 5246, Sect. 5. */
      uint8_t output_block[PSA_HASH_MAX_SIZE];
  
  #if PSA_HASH_MAX_SIZE > 0xff
  #error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
  #endif
  
      /* Indicates how many bytes in the current HMAC block have
       * already been read by the user. */
      uint8_t offset_in_block;
  
      /* The 1-based number of the block. */
      uint8_t block_number;
  
  } psa_tls12_prf_generator_t;
  #endif /* MBEDTLS_MD_C */
  
  struct psa_crypto_generator_s
  {
      psa_algorithm_t alg;
      size_t capacity;
      union
      {
          struct
          {
              uint8_t *data;
              size_t size;
          } buffer;
  #if defined(MBEDTLS_MD_C)
          psa_hkdf_generator_t hkdf;
          psa_tls12_prf_generator_t tls12_prf;
  #endif
      } ctx;
  };
  
  #define PSA_CRYPTO_GENERATOR_INIT {0, 0, {{0, 0}}}
  static inline struct psa_crypto_generator_s psa_crypto_generator_init( void )
  {
      const struct psa_crypto_generator_s v = PSA_CRYPTO_GENERATOR_INIT;
      return( v );
  }
  
  struct psa_key_policy_s
  {
      psa_key_usage_t usage;
      psa_algorithm_t alg;
  };
  
  #endif /* PSA_CRYPTO_STRUCT_H */
  