lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-07-30 22:43:08 +03:00
Code Activity

Implement and test mbedtls_ecp_write_key

Browse Source 
mbedtls_ecp_write_key is a mirror function to mbedtls_ecp_read_key, which
writes a private key back into a byte buffer in the correct format.
This is a helpful convenience function, since the byte order is defined
differently between Montgomery and Weierstrass curves. Since this difference
is accounted for in mbedtls_ecp_read_key, it made sense to add
mbedtls_ecp_write_key for the purpose of abstracting this away such that
psa_export_key doesn't need to take byte order into account.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman
2020-06-09 19:55:26 +02:00
parent 0af1560919
commit de8593f2fe
4 changed files with 133 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
tests/suites/test_suite_ecp.function
View File

@ -1069,12 +1069,14 @@ exit:
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected )
void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected, int canonical )
{
int ret = 0;
mbedtls_ecp_keypair key;
mbedtls_ecp_keypair key2;
mbedtls_ecp_keypair_init( &key );
mbedtls_ecp_keypair_init( &key2 );
ret = mbedtls_ecp_read_key( grp_id, &key, in_key->x, in_key->len );
TEST_ASSERT( ret == expected );
@ -1083,10 +1085,52 @@ void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected )
{
ret = mbedtls_ecp_check_privkey( &key.grp, &key.d );
TEST_ASSERT( ret == 0 );
if( canonical )
{
unsigned char buf[MBEDTLS_ECP_MAX_BYTES];
size_t olen;
ret = mbedtls_ecp_write_key( grp_id, &key, &olen, buf, in_key->len );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( olen == in_key->len );
mbedtls_fprintf( stdout, "written key: ");
for( size_t i = 0; i < in_key->len; i++ ) {
mbedtls_fprintf( stdout, "%02x", buf[i]);
}
mbedtls_fprintf( stdout, "\n");
ASSERT_COMPARE( in_key->x, in_key->len,
buf, olen );
}
else
{
unsigned char export1[MBEDTLS_ECP_MAX_BYTES];
size_t olen1;
unsigned char export2[MBEDTLS_ECP_MAX_BYTES];
size_t olen2;
ret = mbedtls_ecp_write_key( grp_id, &key, &olen1, export1, in_key->len );
TEST_ASSERT( ret == 0 );
ret = mbedtls_ecp_read_key( grp_id, &key2, export1, in_key->len );
TEST_ASSERT( ret == expected );
ret = mbedtls_ecp_write_key( grp_id, &key2, &olen2, export2, in_key->len );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( olen2 == olen1 );
ASSERT_COMPARE( export1, olen1,
export2, olen2 );
}
}
exit:
mbedtls_ecp_keypair_free( &key );
mbedtls_ecp_keypair_free( &key2 );
}
/* END_CASE */