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Factor common code of psa_import_ec_{public,private}_key

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This commit is contained in:
Gilles Peskine 2019-12-02 20:49:42 +01:00
parent 46c33801f3
commit 4cd3277656
1 changed files with 18 additions and 22 deletions
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40
library/psa_crypto.c
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@ -584,6 +584,20 @@ exit:
#endif /* defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C) */
#if defined(MBEDTLS_ECP_C)
static psa_status_t psa_prepare_import_ec_key( psa_ecc_curve_t curve,
mbedtls_ecp_keypair **p_ecp )
{
mbedtls_ecp_group_id grp_id = MBEDTLS_ECP_DP_NONE;
*p_ecp = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
if( *p_ecp == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_ecp_keypair_init( *p_ecp );
/* Load the group. */
grp_id = mbedtls_ecc_group_of_psa( curve );
return( mbedtls_to_psa_error(
mbedtls_ecp_group_load( &( *p_ecp )->grp, grp_id ) ) );
}
/* Import a public key given as the uncompressed representation defined by SEC1
* 2.3.3 as the content of an ECPoint. */
@ -594,19 +608,11 @@ static psa_status_t psa_import_ec_public_key( psa_ecc_curve_t curve,
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_keypair *ecp = NULL;
mbedtls_ecp_group_id grp_id = mbedtls_ecc_group_of_psa( curve );
*p_ecp = NULL;
ecp = mbedtls_calloc( 1, sizeof( *ecp ) );
if( ecp == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_ecp_keypair_init( ecp );
/* Load the group. */
status = mbedtls_to_psa_error(
mbedtls_ecp_group_load( &ecp->grp, grp_id ) );
status = psa_prepare_import_ec_key( curve, &ecp );
if( status != PSA_SUCCESS )
goto exit;
/* Load the public value. */
status = mbedtls_to_psa_error(
mbedtls_ecp_point_read_binary( &ecp->grp, &ecp->Q,
@ -631,9 +637,7 @@ exit:
}
return( status );
}
#endif /* defined(MBEDTLS_ECP_C) */
#if defined(MBEDTLS_ECP_C)
/* Import a private key given as a byte string which is the private value
* in big-endian order. */
static psa_status_t psa_import_ec_private_key( psa_ecc_curve_t curve,
@ -643,22 +647,14 @@ static psa_status_t psa_import_ec_private_key( psa_ecc_curve_t curve,
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_keypair *ecp = NULL;
mbedtls_ecp_group_id grp_id = mbedtls_ecc_group_of_psa( curve );
if( PSA_BITS_TO_BYTES( PSA_ECC_CURVE_BITS( curve ) ) != data_length )
return( PSA_ERROR_INVALID_ARGUMENT );
*p_ecp = NULL;
ecp = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
if( ecp == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_ecp_keypair_init( ecp );
/* Load the group. */
status = mbedtls_to_psa_error(
mbedtls_ecp_group_load( &ecp->grp, grp_id ) );
status = psa_prepare_import_ec_key( curve, &ecp );
if( status != PSA_SUCCESS )
goto exit;
/* Load the secret value. */
status = mbedtls_to_psa_error(
mbedtls_mpi_read_binary( &ecp->d, data, data_length ) );