mcuxClEcc_ECDSA_GeneratedKeys_NIST_P256_example.c

Example for the mcuxClEcc component.

Example for the mcuxClEcc component

/*--------------------------------------------------------------------------*/
/* Copyright 2022-2025 NXP                                                  */
/*                                                                          */
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/* by NXP and may only be used strictly in accordance with the applicable   */
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/* applicable license terms, then you may not retain, install, activate or  */
/* otherwise use the software.                                              */
/*--------------------------------------------------------------------------*/

 
#include <mcuxClToolchain.h>
#include <mcuxClSession.h>
#include <mcuxClBuffer.h>
#include <mcuxClKey.h>
#include <mcuxClHash.h>
#include <mcuxClSignature.h>
#include <mcuxClEcc.h>
#include <mcuxClCore_Examples.h>
#include <mcuxClExample_Session_Helper.h>
#include <mcuxClExample_RNG_Helper.h>
#include <mcuxClRandom.h>
#include <mcuxClRandomModes.h>
#include <mcuxCsslFlowProtection.h>
#include <mcuxClCore_FunctionIdentifiers.h> // Code flow protection
#include <mcuxClCore_Macros.h>
 
 
static const uint8_t digest[] = {
  0xC4u, 0x93u, 0xCFu, 0x6Bu, 0xE5u, 0x11u, 0x35u, 0x22u,
  0x1Au, 0x3Fu, 0x5Cu, 0x7Bu, 0xCFu, 0xF4u, 0x6Du, 0xC6u,
  0x10u, 0x77u, 0x6Eu, 0x2Cu, 0x04u, 0xA3u, 0xB9u, 0x9Du,
  0x39u, 0x3Bu, 0x4Bu, 0xEEu, 0xD5u, 0xDDu, 0x88u, 0x86u
};
 
#define MAX_CPUWA_SIZE MCUXCLCORE_MAX(MCUXCLRANDOM_NCINIT_WACPU_SIZE, \
                       MCUXCLCORE_MAX(MCUXCLRANDOMMODES_INIT_WACPU_SIZE, \
                       MCUXCLCORE_MAX(MCUXCLKEY_GENERATEKEYPAIR_WEIERECC_WACPU_SIZE, \
                       MCUXCLCORE_MAX(MCUXCLSIGNATURE_SIGN_ECDSA_WACPU_SIZE, \
                                     MCUXCLSIGNATURE_VERIFY_ECDSA_WACPU_SIZE))))
 
#define MAX_PKCWA_SIZE MCUXCLCORE_MAX(MCUXCLKEY_GENERATEKEYPAIR_WEIERECC_WAPKC_SIZE_256, \
                           MCUXCLCORE_MAX(MCUXCLSIGNATURE_SIGN_ECDSA_WAPKC_SIZE_256, \
                                         MCUXCLSIGNATURE_VERIFY_ECDSA_WAPKC_SIZE_256))
 
MCUXCLEXAMPLE_FUNCTION(mcuxClEcc_ECDSA_GeneratedKeys_NIST_P256_example)
{
  /**************************************************************************/
  /* Preparation                                                            */
  /**************************************************************************/
 
  /* Setup one session to be used by all functions called */
  mcuxClSession_Descriptor_t sessionDesc;
  mcuxClSession_Handle_t session = &sessionDesc;
  MCUXCLEXAMPLE_ALLOCATE_AND_INITIALIZE_SESSION(session, MAX_CPUWA_SIZE, MAX_PKCWA_SIZE);
 
  /* Allocate space for and initialize private key handle for an ECDSA NIST P-256 private key */
  uint32_t privKeyDesc[MCUXCLKEY_DESCRIPTOR_SIZE_IN_WORDS];
  MCUX_CSSL_ANALYSIS_START_PATTERN_REINTERPRET_MEMORY_OF_OPAQUE_TYPES()
  mcuxClKey_Handle_t privKey = (mcuxClKey_Handle_t) &privKeyDesc;
  MCUX_CSSL_ANALYSIS_STOP_PATTERN_REINTERPRET_MEMORY_OF_OPAQUE_TYPES()
  ALIGNED uint8_t pPrivKeyData[MCUXCLECC_WEIERECC_NIST_P256_SIZE_PRIVATEKEY];
 
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(ki_priv_status, ki_priv_token, mcuxClKey_init(
   /* mcuxClSession_Handle_t session         */ session,
   /* mcuxClKey_Handle_t key                 */ privKey,
   /* mcuxClKey_Type_t type                  */ mcuxClKey_Type_WeierECC_NIST_P256_Priv,
   /* const uint8_t * pKeyData              */ pPrivKeyData,
   /* uint32_t keyDataLength                */ MCUXCLECC_WEIERECC_NIST_P256_SIZE_PRIVATEKEY)
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClKey_init) != ki_priv_token) || (MCUXCLKEY_STATUS_OK != ki_priv_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  /* Allocate space for and initialize public key handle for an ECDSA NIST P-256 public key */
  uint32_t pubKeyDesc[MCUXCLKEY_DESCRIPTOR_SIZE_IN_WORDS];
  MCUX_CSSL_ANALYSIS_START_PATTERN_REINTERPRET_MEMORY_OF_OPAQUE_TYPES()
  mcuxClKey_Handle_t pubKey = (mcuxClKey_Handle_t) &pubKeyDesc;
  MCUX_CSSL_ANALYSIS_STOP_PATTERN_REINTERPRET_MEMORY_OF_OPAQUE_TYPES()
  ALIGNED uint8_t pPubKeyData[MCUXCLECC_WEIERECC_NIST_P256_SIZE_PUBLICKEY];
 
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(ki_pub_status, ki_pub_token, mcuxClKey_init(
   /* mcuxClSession_Handle_t session         */ session,
   /* mcuxClKey_Handle_t key                 */ pubKey,
   /* mcuxClKey_Type_t type                  */ mcuxClKey_Type_WeierECC_NIST_P256_Pub,
   /* const uint8_t * pKeyData              */ pPubKeyData,
   /* uint32_t keyDataLength                */ MCUXCLECC_WEIERECC_NIST_P256_SIZE_PUBLICKEY)
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClKey_init) != ki_pub_token) || (MCUXCLKEY_STATUS_OK != ki_pub_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
 
  /* Initialize the RNG context and Initialize the PRNG */
  MCUXCLEXAMPLE_ALLOCATE_AND_INITIALIZE_RNG(session, MCUXCLRANDOMMODES_CTR_DRBG_AES256_CONTEXT_SIZE, mcuxClRandomModes_Mode_CtrDrbg_AES256_DRG3);
 
 
  /**************************************************************************/
  /* Key pair generation for ECDSA on NIST P-256                            */
  /**************************************************************************/
 
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(gkp_status, gkp_token, mcuxClKey_generate_keypair(
      /* mcuxClSession_Handle_t pSession:   */ session,
      /* mcuxClKey_Generation_t generation: */ mcuxClKey_Generation_ECDSA,
      /* mcuxClKey_Handle_t privKey:        */ privKey,
      /* mcuxClKey_Handle_t pubKey:         */ pubKey)
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClKey_generate_keypair) != gkp_token) || (MCUXCLKEY_STATUS_OK != gkp_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
 
  /**************************************************************************/
  /* ECDSA signature generation on NIST P-256                               */
  /**************************************************************************/
 
  uint8_t signature[MCUXCLECC_WEIERECC_NIST_P256_SIZE_SIGNATURE];
  MCUXCLBUFFER_INIT_RO(buffDigest, NULL, &digest[0], sizeof(digest));
  MCUXCLBUFFER_INIT(buffSignature, NULL, &signature[0], sizeof(MCUXCLECC_WEIERECC_NIST_P256_SIZE_SIGNATURE));
  uint32_t signatureSize = 0u;
 
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(ss_status, ss_token, mcuxClSignature_sign(
    /* mcuxClSession_Handle_t session:   */ session,
    /* mcuxClKey_Handle_t key:           */ privKey,
    /* mcuxClSignature_Mode_t mode:      */ mcuxClSignature_Mode_ECDSA,
    /* mcuxCl_InputBuffer_t pIn:         */ buffDigest,
    /* uint32_t inSize:                 */ sizeof(digest),
    /* mcuxCl_Buffer_t pSignature:       */ buffSignature,
    /* uint32_t * const pSignatureSize: */ &signatureSize)
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClSignature_sign) != ss_token) || (MCUXCLSIGNATURE_STATUS_OK != ss_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  if(MCUXCLECC_WEIERECC_NIST_P256_SIZE_SIGNATURE != signatureSize)
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
 
  /**************************************************************************/
  /* ECDSA signature verification on NIST P-256                             */
  /**************************************************************************/
  /* Record critical parameters for additional protection */
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(rp_status, rp_token, mcuxClSignature_verify_recordParam(
    /* mcuxClSession_Handle_t session: */ session,
    /* mcuxClSignature_Mode_t mode:    */ mcuxClSignature_Mode_ECDSA,
    /* mcuxCl_InputBuffer_t pIn:       */ buffDigest,
    /* uint32_t inSize:               */ sizeof(digest))
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClSignature_verify_recordParam) != rp_token) || (MCUXCLSIGNATURE_STATUS_OK != rp_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  MCUXCLBUFFER_INIT_RO(buffSignatureIn, NULL, &signature[0], sizeof(MCUXCLECC_WEIERECC_NIST_P256_SIZE_SIGNATURE));
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(sv_status, sv_token, mcuxClSignature_verify(
    /* mcuxClSession_Handle_t session:  */ session,
    /* mcuxClKey_Handle_t key:          */ pubKey,
    /* mcuxClSignature_Mode_t mode:     */ mcuxClSignature_Mode_ECDSA,
    /* mcuxCl_InputBuffer_t pIn:        */ buffDigest,
    /* uint32_t inSize:                */ sizeof(digest),
    /* mcuxCl_InputBuffer_t pSignature: */ buffSignatureIn,
    /* uint32_t signatureSize:         */ signatureSize)
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClSignature_verify) != sv_token) || (MCUXCLSIGNATURE_STATUS_OK != sv_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  /* Clean ecc verify session. */
  if(!mcuxClExample_Session_Clean(session))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
  return MCUXCLEXAMPLE_STATUS_OK;
}