Mbed OS Reference | mbedtls_ecc_group_to

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 /**
  * \file mbedtls_ecc_group_to_psa.h
  *
  * Excerpted from Mbed TLS for internal use by Mbed TLS's PK module to
  * interface with generic PSA Crypto implementations.
  *
  */
 /*
  *  Copyright The Mbed TLS Contributors
  *  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.
  */
 
 #ifndef MBEDTLS_ECC_GROUP_TO_PSA_H
 #define MBEDTLS_ECC_GROUP_TO_PSA_H
 
 //#include "mbedtls/platform_util.h"
 
 //#include "crypto_compat.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /** \defgroup psa_tls_helpers TLS helper functions
  * @{
  */
 
 #if defined(MBEDTLS_ECP_C)
 #include <mbedtls/ecp.h>
 
 /** Convert an ECC curve identifier from the Mbed TLS encoding to PSA.
  *
  * \note This function is provided solely for the convenience of
  *       Mbed TLS and may be removed at any time without notice.
  *
  * \param grpid         An Mbed TLS elliptic curve identifier
  *                      (`MBEDTLS_ECP_DP_xxx`).
  * \param[out] bits     On success, the bit size of the curve.
  *
  * \return              The corresponding PSA elliptic curve identifier
  *                      (`PSA_ECC_FAMILY_xxx`).
  * \return              \c 0 on failure (\p grpid is not recognized).
  */
 static inline psa_ecc_family_t mbedtls_ecc_group_to_psa( mbedtls_ecp_group_id grpid,
                                                         size_t *bits )
 {
     switch( grpid )
     {
         case MBEDTLS_ECP_DP_SECP192R1:
             *bits = 192;
             return( PSA_ECC_FAMILY_SECP_R1 );
         case MBEDTLS_ECP_DP_SECP224R1:
             *bits = 224;
             return( PSA_ECC_FAMILY_SECP_R1 );
         case MBEDTLS_ECP_DP_SECP256R1:
             *bits = 256;
             return( PSA_ECC_FAMILY_SECP_R1 );
         case MBEDTLS_ECP_DP_SECP384R1:
             *bits = 384;
             return( PSA_ECC_FAMILY_SECP_R1 );
         case MBEDTLS_ECP_DP_SECP521R1:
             *bits = 521;
             return( PSA_ECC_FAMILY_SECP_R1 );
         case MBEDTLS_ECP_DP_BP256R1:
             *bits = 256;
             return( PSA_ECC_FAMILY_BRAINPOOL_P_R1 );
         case MBEDTLS_ECP_DP_BP384R1:
             *bits = 384;
             return( PSA_ECC_FAMILY_BRAINPOOL_P_R1 );
         case MBEDTLS_ECP_DP_BP512R1:
             *bits = 512;
             return( PSA_ECC_FAMILY_BRAINPOOL_P_R1 );
         case MBEDTLS_ECP_DP_CURVE25519:
             *bits = 255;
             return( PSA_ECC_FAMILY_MONTGOMERY );
         case MBEDTLS_ECP_DP_SECP192K1:
             *bits = 192;
             return( PSA_ECC_FAMILY_SECP_K1 );
         case MBEDTLS_ECP_DP_SECP224K1:
             *bits = 224;
             return( PSA_ECC_FAMILY_SECP_K1 );
         case MBEDTLS_ECP_DP_SECP256K1:
             *bits = 256;
             return( PSA_ECC_FAMILY_SECP_K1 );
         case MBEDTLS_ECP_DP_CURVE448:
             *bits = 448;
             return( PSA_ECC_FAMILY_MONTGOMERY );
         default:
             *bits = 0;
             return( 0 );
     }
 }
 
 #endif /* MBEDTLS_ECP_C */
 
 /**@}*/
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* MBEDTLS_ECC_GROUP_TO_PSA_H */
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