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psa_import_key: split RSA and ECP code into small functions

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No intended behavior change except that some edge cases may have
swapped between INVALID_ARGUMENT and NOT_SUPPORTED.
This commit is contained in:
Gilles Peskine 2018-06-29 19:52:37 +02:00 committed by itayzafrir
parent d8008d6dfe
commit af89fd771e
1 changed files with 53 additions and 38 deletions
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91
library/psa_crypto.c
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@ -541,6 +541,43 @@ static psa_status_t prepare_raw_data_slot( psa_key_type_t type,
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C)
static psa_status_t psa_import_rsa_key( mbedtls_pk_context *pk,
mbedtls_rsa_context **p_rsa )
{
if( mbedtls_pk_get_type( pk ) != MBEDTLS_PK_RSA )
return( PSA_ERROR_INVALID_ARGUMENT );
else
{
mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *pk );
size_t bits = mbedtls_rsa_get_bitlen( rsa );
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
return( PSA_ERROR_NOT_SUPPORTED );
*p_rsa = rsa;
return( PSA_SUCCESS );
}
}
#endif /* defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C) */
#if defined(MBEDTLS_ECP_C) && defined(MBEDTLS_PK_PARSE_C)
static psa_status_t psa_import_ecp_key( psa_ecc_curve_t expected_curve,
mbedtls_pk_context *pk,
mbedtls_ecp_keypair **p_ecp )
{
if( mbedtls_pk_get_type( pk ) != MBEDTLS_PK_ECKEY )
return( PSA_ERROR_INVALID_ARGUMENT );
else
{
mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( *pk );
psa_ecc_curve_t actual_curve = mbedtls_ecc_group_to_psa( ecp->grp.id );
if( actual_curve != expected_curve )
return( PSA_ERROR_INVALID_ARGUMENT );
*p_ecp = ecp;
return( PSA_SUCCESS );
}
}
#endif /* defined(MBEDTLS_ECP_C) && defined(MBEDTLS_PK_PARSE_C) */
psa_status_t psa_import_key( psa_key_slot_t key,
psa_key_type_t type,
const uint8_t *data,
@ -572,55 +609,33 @@ psa_status_t psa_import_key( psa_key_slot_t key,
int ret;
mbedtls_pk_context pk;
mbedtls_pk_init( &pk );
/* Parse the data. */
if( PSA_KEY_TYPE_IS_KEYPAIR( type ) )
ret = mbedtls_pk_parse_key( &pk, data, data_length, NULL, 0 );
else
ret = mbedtls_pk_parse_public_key( &pk, data, data_length );
if( ret != 0 )
return( mbedtls_to_psa_error( ret ) );
switch( mbedtls_pk_get_type( &pk ) )
{
/* We have something that the pkparse module recognizes.
* If it has the expected type and passes any type-specific
* checks, store it. */
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
if( PSA_KEY_TYPE_IS_RSA( type ) )
{
mbedtls_rsa_context *rsa = mbedtls_pk_rsa( pk );
size_t bits = mbedtls_rsa_get_bitlen( rsa );
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
{
status = PSA_ERROR_NOT_SUPPORTED;
break;
}
slot->data.rsa = rsa;
}
else
status = PSA_ERROR_INVALID_ARGUMENT;
break;
if( PSA_KEY_TYPE_IS_RSA( type ) )
status = psa_import_rsa_key( &pk, &slot->data.rsa );
else
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
case MBEDTLS_PK_ECKEY:
if( PSA_KEY_TYPE_IS_ECC( type ) )
{
mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
psa_ecc_curve_t actual_curve =
mbedtls_ecc_group_to_psa( ecp->grp.id );
psa_ecc_curve_t expected_curve =
PSA_KEY_TYPE_GET_CURVE( type );
if( actual_curve != expected_curve )
{
status = PSA_ERROR_INVALID_ARGUMENT;
break;
}
slot->data.ecp = ecp;
}
else
status = PSA_ERROR_INVALID_ARGUMENT;
break;
if( PSA_KEY_TYPE_IS_ECC( type ) )
status = psa_import_ecp_key( PSA_KEY_TYPE_GET_CURVE( type ),
&pk, &slot->data.ecp );
else
#endif /* MBEDTLS_ECP_C */
default:
status = PSA_ERROR_INVALID_ARGUMENT;
break;
{
status = PSA_ERROR_NOT_SUPPORTED;
}
/* Free the content of the pk object only on error. On success,
* the content of the object has been stored in the slot. */
if( status != PSA_SUCCESS )