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Merge pull request #770 from gilles-peskine-arm/mpi_fill_random-rng_failure-2.7

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Backport 2.7: Handle RNG failure in mbedtls_mpi_fill_random
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Gilles Peskine 2020-11-30 18:02:02 +01:00 committed by GitHub
parent 4685d501e8 c0a5b254e7
commit 1a57cb72b0
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 90 additions and 0 deletions
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42
tests/suites/test_suite_mpi.data
View file

@ -899,6 +899,48 @@ mbedtls_mpi_set_bit:16:"00":32:1:16:"0100000000":0
Test bit set (Invalid bit value)
mbedtls_mpi_set_bit:16:"00":5:2:16:"00":MBEDTLS_ERR_MPI_BAD_INPUT_DATA
Fill random: 0 bytes
mpi_fill_random:0:0:0
Fill random: 1 byte, good
mpi_fill_random:1:1:0
Fill random: 2 bytes, good, no leading zero
mpi_fill_random:2:2:0
Fill random: 2 bytes, good, 1 leading zero
mpi_fill_random:2:256:0
Fill random: MAX_SIZE - 7, good
mpi_fill_random:MBEDTLS_MPI_MAX_SIZE - 7:MBEDTLS_MPI_MAX_SIZE - 7:0
Fill random: MAX_SIZE, good
mpi_fill_random:MBEDTLS_MPI_MAX_SIZE:MBEDTLS_MPI_MAX_SIZE:0
Fill random: 1 byte, RNG failure
mpi_fill_random:1:0:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: 2 bytes, RNG failure after 1 byte
mpi_fill_random:2:1:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: 4 bytes, RNG failure after 3 bytes
mpi_fill_random:4:3:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: 8 bytes, RNG failure after 7 bytes
mpi_fill_random:8:7:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: 16 bytes, RNG failure after 1 bytes
mpi_fill_random:16:1:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: 16 bytes, RNG failure after 8 bytes
mpi_fill_random:16:8:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: 16 bytes, RNG failure after 15 bytes
mpi_fill_random:16:15:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Fill random: MAX_SIZE bytes, RNG failure after MAX_SIZE-1 bytes
mpi_fill_random:MBEDTLS_MPI_MAX_SIZE:MBEDTLS_MPI_MAX_SIZE-1:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
MPI Selftest
depends_on:MBEDTLS_SELF_TEST
mpi_selftest:

48
tests/suites/test_suite_mpi.function
View file

@ -1,5 +1,6 @@
/* BEGIN_HEADER */
#include "mbedtls/bignum.h"
#include "mbedtls/entropy.h"
typedef struct mbedtls_test_mpi_random
{
@ -44,6 +45,22 @@ int mbedtls_test_mpi_miller_rabin_determinizer( void* state,
return( 0 );
}
/* Random generator that is told how many bytes to return. */
static int f_rng_bytes_left( void *state, unsigned char *buf, size_t len )
{
size_t *bytes_left = state;
size_t i;
for( i = 0; i < len; i++ )
{
if( *bytes_left == 0 )
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
buf[i] = *bytes_left & 0xff;
--( *bytes_left );
}
return( 0 );
}
/* END_HEADER */
/* BEGIN_DEPENDENCIES
@ -1037,6 +1054,37 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void mpi_fill_random( int wanted_bytes, int rng_bytes, int expected_ret )
{
mbedtls_mpi X;
int ret;
size_t bytes_left = rng_bytes;
mbedtls_mpi_init( &X );
ret = mbedtls_mpi_fill_random( &X, wanted_bytes,
f_rng_bytes_left, &bytes_left );
TEST_ASSERT( ret == expected_ret );
if( expected_ret == 0 )
{
/* mbedtls_mpi_fill_random is documented to use bytes from the RNG
* as a big-endian representation of the number. We know when
* our RNG function returns null bytes, so we know how many
* leading zero bytes the number has. */
size_t leading_zeros = 0;
if( wanted_bytes > 0 && rng_bytes % 256 == 0 )
leading_zeros = 1;
TEST_ASSERT( mbedtls_mpi_size( &X ) + leading_zeros ==
(size_t) wanted_bytes );
TEST_ASSERT( (int) bytes_left == rng_bytes - wanted_bytes );
}
exit:
mbedtls_mpi_free( &X );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void mpi_selftest()
{