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Add ecp_check_pub_priv()

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Manuel Pégourié-Gonnard 2014-11-06 15:25:32 +01:00
parent 2f8d1f9fc3
commit 30668d688d
4 changed files with 107 additions and 0 deletions
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12
include/polarssl/ecp.h
View file

@ -635,6 +635,18 @@ int ecp_gen_keypair( ecp_group *grp, mpi *d, ecp_point *Q,
int ecp_gen_key( ecp_group_id grp_id, ecp_keypair *key,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Check a public-private key pair
*
* \param pub Keypair structure holding a public key
* \param prv Keypair structure holding a private (plus public) key
*
* \return 0 if successfull (keys are valid and match), or
* POLARSSL_ERR_ECP_BAD_INPUT_DATA, or
* a POLARSSL_ERR_ECP_XXX or POLARSSL_ERR_MPI_XXX code.
*/
int ecp_check_pub_priv( const ecp_keypair *pub, const ecp_keypair *prv );
#if defined(POLARSSL_SELF_TEST)
/**
* \brief Checkup routine

42
library/ecp.c
View file

@ -1897,6 +1897,48 @@ int ecp_gen_key( ecp_group_id grp_id, ecp_keypair *key,
return( ecp_gen_keypair( &key->grp, &key->d, &key->Q, f_rng, p_rng ) );
}
/*
* Check a public-private key pair
*/
int ecp_check_pub_priv( const ecp_keypair *pub, const ecp_keypair *prv )
{
int ret;
ecp_point Q;
ecp_group grp;
if( pub->grp.id == POLARSSL_ECP_DP_NONE ||
pub->grp.id != prv->grp.id ||
mpi_cmp_mpi( &pub->Q.X, &prv->Q.X ) ||
mpi_cmp_mpi( &pub->Q.Y, &prv->Q.Y ) ||
mpi_cmp_mpi( &pub->Q.Z, &prv->Q.Z ) )
{
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
}
ecp_point_init( &Q );
ecp_group_init( &grp );
/* ecp_mul() needs a non-const group... */
ecp_group_copy( &grp, &prv->grp );
/* Also checks d is valid */
MPI_CHK( ecp_mul( &grp, &Q, &prv->d, &prv->grp.G, NULL, NULL ) );
if( mpi_cmp_mpi( &Q.X, &prv->Q.X ) ||
mpi_cmp_mpi( &Q.Y, &prv->Q.Y ) ||
mpi_cmp_mpi( &Q.Z, &prv->Q.Z ) )
{
ret = POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
cleanup:
ecp_point_free( &Q );
ecp_group_free( &grp );
return( ret );
}
#if defined(POLARSSL_SELF_TEST)
/*

27
tests/suites/test_suite_ecp.data
View file

@ -324,6 +324,33 @@ ECP check privkey #11 (montgomery, OK)
depends_on:POLARSSL_ECP_DP_M255_ENABLED
ecp_check_privkey:POLARSSL_ECP_DP_M255:"7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8":0
ECP check public-private #1 (OK)
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED
ecp_check_pub_priv:POLARSSL_ECP_DP_SECP256R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ECP_DP_SECP256R1:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":0
ECP check public-private #2 (group none)
ecp_check_pub_priv:POLARSSL_ECP_DP_NONE:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ECP_DP_NONE:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ERR_ECP_BAD_INPUT_DATA
ECP check public-private #3 (group mismatch)
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED:POLARSSL_ECP_DP_SECP384R1_ENABLED
ecp_check_pub_priv:POLARSSL_ECP_DP_SECP384R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ECP_DP_SECP256R1:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ERR_ECP_BAD_INPUT_DATA
ECP check public-private #4 (Qx mismatch)
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED
ecp_check_pub_priv:POLARSSL_ECP_DP_SECP256R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596293":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ECP_DP_SECP256R1:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ERR_ECP_BAD_INPUT_DATA
ECP check public-private #5 (Qy mismatch)
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED
ecp_check_pub_priv:POLARSSL_ECP_DP_SECP256R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edfe":POLARSSL_ECP_DP_SECP256R1:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ERR_ECP_BAD_INPUT_DATA
ECP check public-private #6 (wrong Qx)
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED
ecp_check_pub_priv:POLARSSL_ECP_DP_SECP256R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596293":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ECP_DP_SECP256R1:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596293":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":POLARSSL_ERR_ECP_BAD_INPUT_DATA
ECP check public-private #7 (wrong Qy)
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED
ecp_check_pub_priv:POLARSSL_ECP_DP_SECP256R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edfe":POLARSSL_ECP_DP_SECP256R1:"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edfe":POLARSSL_ERR_ECP_BAD_INPUT_DATA
ECP gen keypair
depends_on:POLARSSL_ECP_DP_SECP192R1_ENABLED
ecp_gen_keypair:POLARSSL_ECP_DP_SECP192R1

26
tests/suites/test_suite_ecp.function
View file

@ -598,6 +598,32 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void ecp_check_pub_priv( int id_pub, char *Qx_pub, char *Qy_pub,
int id, char *d, char *Qx, char *Qy, int ret )
{
ecp_keypair pub, prv;
ecp_keypair_init( &pub );
ecp_keypair_init( &prv );
if( id_pub != POLARSSL_ECP_DP_NONE )
TEST_ASSERT( ecp_use_known_dp( &pub.grp, id_pub ) == 0 );
TEST_ASSERT( ecp_point_read_string( &pub.Q, 16, Qx_pub, Qy_pub ) == 0 );
if( id != POLARSSL_ECP_DP_NONE )
TEST_ASSERT( ecp_use_known_dp( &prv.grp, id ) == 0 );
TEST_ASSERT( ecp_point_read_string( &prv.Q, 16, Qx, Qy ) == 0 );
TEST_ASSERT( mpi_read_string( &prv.d, 16, d ) == 0 );
TEST_ASSERT( ecp_check_pub_priv( &pub, &prv ) == ret );
exit:
ecp_keypair_free( &pub );
ecp_keypair_free( &prv );
}
/* END_CASE */
/* BEGIN_CASE */
void ecp_gen_keypair( int id )
{