Merge pull request #346 from gilles-peskine-arm/mpi_copy_shrink

Improve robustness and testing of mbedtls_mpi_copy
This commit is contained in:
Manuel Pégourié-Gonnard 2020-02-06 09:52:01 +01:00 committed by GitHub
commit 4d8c836cdc
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 161 additions and 34 deletions

View file

@ -158,9 +158,10 @@ int mbedtls_mpi_shrink( mbedtls_mpi *X, size_t nblimbs )
if( nblimbs > MBEDTLS_MPI_MAX_LIMBS )
return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
/* Actually resize up in this case */
/* Actually resize up if there are currently fewer than nblimbs limbs. */
if( X->n <= nblimbs )
return( mbedtls_mpi_grow( X, nblimbs ) );
/* After this point, then X->n > nblimbs and in particular X->n > 0. */
for( i = X->n - 1; i > 0; i-- )
if( X->p[i] != 0 )
@ -199,7 +200,7 @@ int mbedtls_mpi_copy( mbedtls_mpi *X, const mbedtls_mpi *Y )
if( X == Y )
return( 0 );
if( Y->p == NULL )
if( Y->n == 0 )
{
mbedtls_mpi_free( X );
return( 0 );

View file

@ -292,37 +292,106 @@ mbedtls_mpi_cmp_abs:10:"2":10:"-3":-1
Base test mbedtls_mpi_cmp_abs (Mix values) #3
mbedtls_mpi_cmp_abs:10:"-2":10:"1":1
Base test mbedtls_mpi_copy #1
mbedtls_mpi_copy:0:1500
Copy zero (1 limb) to positive (1 limb)
mbedtls_mpi_copy_sint:0:1500
Base test mpi_copy_self #1
Copy zero (1 limb) to negative (1 limb)
mbedtls_mpi_copy_sint:0:-1500
Copy positive (1 limb) to zero (1 limb)
mbedtls_mpi_copy_sint:1500:0
Copy negative (1 limb) to zero (1 limb)
mbedtls_mpi_copy_sint:-1500:0
Copy positive (1 limb) to negative (1 limb)
mbedtls_mpi_copy_sint:1500:-42
Copy negative (1 limb) to positive (1 limb)
mbedtls_mpi_copy_sint:-42:1500
Copy zero (null) to zero (null)
mbedtls_mpi_copy_binary:"":""
Copy zero (null) to positive (1 limb)
mbedtls_mpi_copy_binary:"":"1234"
Copy positive (1 limb) to zero (null)
mbedtls_mpi_copy_binary:"1234":""
Copy positive to larger
mbedtls_mpi_copy_binary:"bead":"ca5cadedb01dfaceacc01ade"
Copy positive to smaller
mbedtls_mpi_copy_binary:"ca5cadedb01dfaceacc01ade":"bead"
Copy self: positive (1 limb)
mpi_copy_self:14
Base test mbedtls_mpi_swap #1
mbedtls_mpi_swap:0:1500
Copy self: zero (1 limb)
mpi_copy_self:0
Test mbedtls_mpi_shrink #1
Swap zero (1 limb) with positive (1 limb)
mbedtls_mpi_swap_sint:0:1500
Swap zero (1 limb) with negative (1 limb)
mbedtls_mpi_swap_sint:0:-1500
Swap positive (1 limb) with zero (1 limb)
mbedtls_mpi_swap_sint:1500:0
Swap negative (1 limb) with zero (1 limb)
mbedtls_mpi_swap_sint:-1500:0
Swap positive (1 limb) with negative (1 limb)
mbedtls_mpi_swap_sint:1500:-42
Swap negative (1 limb) with positive (1 limb)
mbedtls_mpi_swap_sint:-42:1500
Swap zero (null) with zero (null)
mbedtls_mpi_swap_binary:"":""
Swap zero (null) with positive (1 limb)
mbedtls_mpi_swap_binary:"":"1234"
Swap positive (1 limb) with zero (null)
mbedtls_mpi_swap_binary:"1234":""
Swap positive with larger
mbedtls_mpi_swap_binary:"bead":"ca5cadedb01dfaceacc01ade"
Swap positive with smaller
mbedtls_mpi_swap_binary:"ca5cadedb01dfaceacc01ade":"bead"
Swap self: 1 limb
mpi_swap_self:"face"
Swap self: null
mpi_swap_self:""
Shrink 2 limbs in a buffer of size 2 to 4
mbedtls_mpi_shrink:2:2:4:4
Test mbedtls_mpi_shrink #2
Shrink 2 limbs in a buffer of size 4 to 4
mbedtls_mpi_shrink:4:2:4:4
Test mbedtls_mpi_shrink #3
Shrink 2 limbs in a buffer of size 8 to 4
mbedtls_mpi_shrink:8:2:4:4
Test mbedtls_mpi_shrink #4
Shrink 4 limbs in a buffer of size 8 to 4
mbedtls_mpi_shrink:8:4:4:4
Test mbedtls_mpi_shrink #5
Shrink 6 limbs in a buffer of size 8 to 4 yielding 6
mbedtls_mpi_shrink:8:6:4:6
Test mbedtls_mpi_shrink #6
Shrink 2 limbs in a buffer of size 4 to 0 yielding 2
mbedtls_mpi_shrink:4:2:0:2
Test mbedtls_mpi_shrink #7
Shrink 1 limbs in a buffer of size 4 to 0 yielding 1
mbedtls_mpi_shrink:4:1:0:1
Test mbedtls_mpi_shrink #8
Shrink 0 limbs in a buffer of size 4 to 0 yielding 1
mbedtls_mpi_shrink:4:0:0:1
Test mbedtls_mpi_safe_cond_assign #1

View file

@ -629,22 +629,40 @@ exit:
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_mpi_copy( int input_X, int input_A )
void mbedtls_mpi_copy_sint( int input_X, int input_Y )
{
mbedtls_mpi X, Y, A;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &A );
mbedtls_mpi X, Y;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
TEST_ASSERT( mbedtls_mpi_lset( &X, input_X ) == 0 );
TEST_ASSERT( mbedtls_mpi_lset( &Y, input_A ) == 0 );
TEST_ASSERT( mbedtls_mpi_lset( &A, input_A ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) != 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &A ) == 0 );
TEST_ASSERT( mbedtls_mpi_lset( &Y, input_Y ) == 0 );
TEST_ASSERT( mbedtls_mpi_copy( &Y, &X ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &A ) != 0 );
TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_X ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_X ) == 0 );
exit:
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &A );
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_mpi_copy_binary( data_t *input_X, data_t *input_Y )
{
mbedtls_mpi X, Y, X0;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &X0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &X, input_X->x, input_X->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &Y, input_Y->x, input_Y->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &X0, input_X->x, input_X->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
TEST_ASSERT( mbedtls_mpi_copy( &Y, &X ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &X0 ) == 0 );
exit:
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &X0 );
}
/* END_CASE */
@ -736,22 +754,61 @@ exit:
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_mpi_swap( int input_X, int input_Y )
void mbedtls_mpi_swap_sint( int input_X, int input_Y )
{
mbedtls_mpi X, Y, A;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &A );
mbedtls_mpi X, Y;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
TEST_ASSERT( mbedtls_mpi_lset( &X, input_X ) == 0 );
TEST_ASSERT( mbedtls_mpi_lset( &Y, input_Y ) == 0 );
TEST_ASSERT( mbedtls_mpi_lset( &A, input_X ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) != 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &A ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_X ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_Y ) == 0 );
mbedtls_mpi_swap( &X, &Y );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y ) != 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &A ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_Y ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_X ) == 0 );
exit:
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &A );
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_mpi_swap_binary( data_t *input_X, data_t *input_Y )
{
mbedtls_mpi X, Y, X0, Y0;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
mbedtls_mpi_init( &X0 ); mbedtls_mpi_init( &Y0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &X, input_X->x, input_X->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &Y, input_Y->x, input_Y->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &X0, input_X->x, input_X->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &Y0, input_Y->x, input_Y->len ) == 0 );
mbedtls_mpi_swap( &X, &Y );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &Y0 ) == 0 );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &X0 ) == 0 );
exit:
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
mbedtls_mpi_free( &X0 ); mbedtls_mpi_free( &Y0 );
}
/* END_CASE */
/* BEGIN_CASE */
void mpi_swap_self( data_t *input_X )
{
mbedtls_mpi X, X0;
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &X0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &X, input_X->x, input_X->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_binary( &X0, input_X->x, input_X->len ) == 0 );
mbedtls_mpi_swap( &X, &X );
TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
exit:
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &X0 );
}
/* END_CASE */