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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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4
programs/pkey/dh_server.c
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@ -254,14 +254,14 @@ int main( void )
memset( buf, 0, sizeof( buf ) );
n = dhm.MBEDTLS_PRIVATE(len);
n = mbedtls_dhm_get_len( &dhm );
if( ( ret = mbedtls_net_recv( &client_fd, buf, n ) ) != (int) n )
{
mbedtls_printf( " failed\n ! mbedtls_net_recv returned %d\n\n", ret );
goto exit;
}
if( ( ret = mbedtls_dhm_read_public( &dhm, buf, dhm.MBEDTLS_PRIVATE(len) ) ) != 0 )
if( ( ret = mbedtls_dhm_read_public( &dhm, buf, n ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_dhm_read_public returned %d\n\n", ret );
goto exit;