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Add test case for ecdh_calc_secret

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Add a test case for doing an ECDH calculation by calling
mbedtls_ecdh_get_params on both keys, then mbedtls_ecdh_calc_secret.
This commit is contained in:
Gilles Peskine 2018-11-07 22:07:58 +01:00
parent bdc807dbe8
commit 390bbd08f7
2 changed files with 111 additions and 0 deletions
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8
tests/suites/test_suite_ecdh.data
View File

@ -37,3 +37,11 @@ ecdh_exchange:MBEDTLS_ECP_DP_SECP192R1
ECDH exchange #2
depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED
ecdh_exchange:MBEDTLS_ECP_DP_SECP521R1
ECDH calc_secret: ours first, SECP256R1 (RFC 5903)
depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
ecdh_exchange_calc_secret:MBEDTLS_ECP_DP_SECP256R1:"c6ef9c5d78ae012a011164acb397ce2088685d8f06bf9be0b283ab46476bee53":"04dad0b65394221cf9b051e1feca5787d098dfe637fc90b9ef945d0c37725811805271a0461cdb8252d61f1c456fa3e59ab1f45b33accf5f58389e0577b8990bb3":0:"d6840f6b42f6edafd13116e0e12565202fef8e9ece7dce03812464d04b9442de"
ECDH calc_secret: theirs first, SECP256R1 (RFC 5903)
depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
ecdh_exchange_calc_secret:MBEDTLS_ECP_DP_SECP256R1:"c6ef9c5d78ae012a011164acb397ce2088685d8f06bf9be0b283ab46476bee53":"04dad0b65394221cf9b051e1feca5787d098dfe637fc90b9ef945d0c37725811805271a0461cdb8252d61f1c456fa3e59ab1f45b33accf5f58389e0577b8990bb3":1:"d6840f6b42f6edafd13116e0e12565202fef8e9ece7dce03812464d04b9442de"

103
tests/suites/test_suite_ecdh.function
View File

@ -1,5 +1,47 @@
/* BEGIN_HEADER */
#include "mbedtls/ecdh.h"
static int load_public_key( int grp_id, const char *point_str,
mbedtls_ecp_keypair *ecp )
{
int ok = 0;
unsigned char point_buf[MBEDTLS_ECP_MAX_BYTES];
size_t point_len = unhexify( point_buf, point_str );
TEST_ASSERT( mbedtls_ecp_group_load( &ecp->grp, grp_id ) == 0 );
TEST_ASSERT( mbedtls_ecp_point_read_binary( &ecp->grp,
&ecp->Q,
point_buf,
point_len ) == 0 );
TEST_ASSERT( mbedtls_ecp_check_pubkey( &ecp->grp,
&ecp->Q ) == 0 );
ok = 1;
exit:
return( ok );
}
static int load_private_key( int grp_id, const char *private_key_str,
mbedtls_ecp_keypair *ecp,
rnd_pseudo_info *rnd_info )
{
int ok = 0;
unsigned char private_key_buf[MBEDTLS_ECP_MAX_BYTES];
size_t private_key_len = unhexify( private_key_buf, private_key_str );
TEST_ASSERT( mbedtls_ecp_group_load( &ecp->grp, grp_id ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &ecp->d,
private_key_buf,
private_key_len ) == 0 );
TEST_ASSERT( mbedtls_ecp_check_privkey( &ecp->grp, &ecp->d ) == 0 );
/* Calculate the public key from the private key. */
TEST_ASSERT( mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d,
&ecp->grp.G,
&rnd_pseudo_rand, rnd_info ) == 0 );
ok = 1;
exit:
return( ok );
}
/* END_HEADER */
/* BEGIN_DEPENDENCIES
@ -158,3 +200,64 @@ exit:
mbedtls_ecdh_free( &cli );
}
/* END_CASE */
/* BEGIN_CASE */
void ecdh_exchange_calc_secret( int grp_id,
char *our_private_key,
char *their_point,
int ours_first,
char *expected_str )
{
rnd_pseudo_info rnd_info;
unsigned char expected_buf[MBEDTLS_ECP_MAX_BYTES];
size_t expected_len;
mbedtls_ecp_keypair our_key;
mbedtls_ecp_keypair their_key;
mbedtls_ecdh_context ecdh;
unsigned char shared_secret[MBEDTLS_ECP_MAX_BYTES];
size_t shared_secret_length = 0;
memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
mbedtls_ecdh_init( &ecdh );
mbedtls_ecp_keypair_init( &our_key );
mbedtls_ecp_keypair_init( &their_key );
expected_len = unhexify( expected_buf, expected_str );
if( ! load_private_key( grp_id, our_private_key, &our_key, &rnd_info ) )
goto exit;
if( ! load_public_key( grp_id, their_point, &their_key ) )
goto exit;
/* Import the keys to the ECDH calculation. */
if( ours_first )
{
TEST_ASSERT( mbedtls_ecdh_get_params(
&ecdh, &our_key, MBEDTLS_ECDH_OURS ) == 0 );
TEST_ASSERT( mbedtls_ecdh_get_params(
&ecdh, &their_key, MBEDTLS_ECDH_THEIRS ) == 0 );
}
else
{
TEST_ASSERT( mbedtls_ecdh_get_params(
&ecdh, &their_key, MBEDTLS_ECDH_THEIRS ) == 0 );
TEST_ASSERT( mbedtls_ecdh_get_params(
&ecdh, &our_key, MBEDTLS_ECDH_OURS ) == 0 );
}
/* Perform the ECDH calculation. */
TEST_ASSERT( mbedtls_ecdh_calc_secret(
&ecdh,
&shared_secret_length,
shared_secret, sizeof( shared_secret ),
&rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( shared_secret_length == expected_len );
TEST_ASSERT( memcmp( expected_buf, shared_secret,
shared_secret_length ) == 0 );
exit:
mbedtls_ecdh_free( &ecdh );
mbedtls_ecp_keypair_free( &our_key );
mbedtls_ecp_keypair_free( &their_key );
}
/* END_CASE */