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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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library/ssl_srv.c
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@ -3049,7 +3049,7 @@ static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl,
if( ( ret = mbedtls_dhm_make_params(
&ssl->handshake->dhm_ctx,
(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
(int) mbedtls_dhm_get_len( &ssl->handshake->dhm_ctx ),
ssl->out_msg + ssl->out_msglen, &len,
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
{