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mbedtls_mpi_random: check for invalid arguments

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-03-29 22:14:51 +02:00
parent 4699fa47d2
commit 9312ba5304
4 changed files with 38 additions and 0 deletions
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2
include/mbedtls/bignum.h
View file

@ -894,6 +894,8 @@ int mbedtls_mpi_fill_random( mbedtls_mpi *X, size_t size,
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED if a memory allocation failed.
* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if \p min or \p N is invalid
* or if they are incompatible.
* \return Another negative error code on failure.
*/
int mbedtls_mpi_random( mbedtls_mpi *X,

5
library/bignum.c
View file

@ -2445,6 +2445,11 @@ int mbedtls_mpi_random( mbedtls_mpi *X,
size_t n_bits = mbedtls_mpi_bitlen( N );
size_t n_bytes = ( n_bits + 7 ) / 8;
if( min < 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
if( mbedtls_mpi_cmp_int( N, min ) <= 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
/*
* Match the procedure given in RFC 6979 §3.3 (deterministic ECDSA)
* when f_rng is a suitably parametrized instance of HMAC_DRBG:

9
tests/suites/test_suite_mpi.data
View file

@ -1132,6 +1132,15 @@ mpi_random_many:1:"04":1000
MPI random in range: 3..4
mpi_random_many:1:"04":1000
MPI random bad arguments: min < 0
mpi_random_fail:-1:"04":MBEDTLS_ERR_MPI_BAD_INPUT_DATA
MPI random bad arguments: min = N = 0
mpi_random_fail:0:"00":MBEDTLS_ERR_MPI_BAD_INPUT_DATA
MPI random bad arguments: min = N = 1
mpi_random_fail:1:"01":MBEDTLS_ERR_MPI_BAD_INPUT_DATA
MPI Selftest
depends_on:MBEDTLS_SELF_TEST
mpi_selftest:

22
tests/suites/test_suite_mpi.function
View file

@ -1537,6 +1537,28 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void mpi_random_fail( int min, data_t *bound_bytes, int expected_ret )
{
mbedtls_mpi upper_bound;
mbedtls_mpi result;
int actual_ret;
mbedtls_mpi_init( &upper_bound );
mbedtls_mpi_init( &result );
TEST_EQUAL( 0, mbedtls_mpi_read_binary( &upper_bound,
bound_bytes->x, bound_bytes->len ) );
actual_ret = mbedtls_mpi_random( &result, min, &upper_bound,
mbedtls_test_rnd_std_rand, NULL );
TEST_EQUAL( expected_ret, actual_ret );
exit:
mbedtls_mpi_free( &upper_bound );
mbedtls_mpi_free( &result );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void mpi_selftest( )
{