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Private EC key format: change to raw secret value (export)

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Change the import/export format of private elliptic curve keys from
RFC 5915 to the raw secret value. This commit updates the export code.
This commit is contained in:
Gilles Peskine 2018-10-29 19:26:02 +01:00
parent f76aa7789b
commit 188c71e382
1 changed files with 15 additions and 0 deletions
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15
library/psa_crypto.c
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@ -869,6 +869,21 @@ static psa_status_t psa_internal_export_key( psa_key_slot_t key,
*data_length = slot->data.raw.bytes; *data_length = slot->data.raw.bytes;
return( PSA_SUCCESS ); return( PSA_SUCCESS );
} }
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC_KEYPAIR( slot->type ) && !export_public_key )
{
size_t bytes = PSA_BITS_TO_BYTES( psa_get_key_bits( slot ) );
if( bytes > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = mbedtls_to_psa_error(
mbedtls_mpi_write_binary( &slot->data.ecp->d, data, bytes ) );
if( status != PSA_SUCCESS )
return( status );
memset( data + bytes, 0, data_size - bytes );
*data_length = bytes;
return( PSA_SUCCESS );
}
#endif
else else
{ {
#if defined(MBEDTLS_PK_WRITE_C) #if defined(MBEDTLS_PK_WRITE_C)