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DHM: new functions to query the length of the modulus

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Add two functions mbedtls_dhm_get_len() and mbedtls_dhm_get_bitlen() to
query the length of the modulus in bytes or bits.

Remove the len field: the cost of calling mbedtls_dhm_get_len() each time
it's needed is negligible, and this improves the abstraction of the DHM
module.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-05-27 22:17:07 +02:00
parent 85b1bc65a0
commit 487bbf6805
9 changed files with 58 additions and 26 deletions
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7
programs/test/benchmark.c
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@ -827,6 +827,7 @@ int main( int argc, char *argv[] )
mbedtls_dhm_context dhm;
size_t olen;
size_t n;
for( i = 0; (size_t) i < sizeof( dhm_sizes ) / sizeof( dhm_sizes[0] ); i++ )
{
mbedtls_dhm_init( &dhm );
@ -839,14 +840,14 @@ int main( int argc, char *argv[] )
mbedtls_exit( 1 );
}
dhm.len = mbedtls_mpi_size( &dhm.P );
mbedtls_dhm_make_public( &dhm, (int) dhm.len, buf, dhm.len, myrand, NULL );
n = mbedtls_mpi_size( &dhm.P );
mbedtls_dhm_make_public( &dhm, (int) n, buf, n, myrand, NULL );
if( mbedtls_mpi_copy( &dhm.GY, &dhm.GX ) != 0 )
mbedtls_exit( 1 );
mbedtls_snprintf( title, sizeof( title ), "DHE-%d", dhm_sizes[i] );
TIME_PUBLIC( title, "handshake",
ret |= mbedtls_dhm_make_public( &dhm, (int) dhm.len, buf, dhm.len,
ret |= mbedtls_dhm_make_public( &dhm, (int) n, buf, n,
myrand, NULL );
ret |= mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &olen, myrand, NULL ) );