AuroraMiddleware/mbedtls
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Clarify some comments

Browse Source 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-04-09 15:46:51 +02:00
parent bd43f67a9b
commit 392d1010dc
2 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
library/ecp_invasive.h
View File

@ -38,9 +38,10 @@
* - bits is a multiple of 64 or is 224
* - c is -1 or -2
* - 0 <= N < 2^bits
* - N has room for bits+64 bits
* - N has room for bits plus one limb
*
* Set N to c * 2^bits + N.
* Behavior:
* Set N to c * 2^bits + old_value_of_N.
*/
void mbedtls_ecp_fix_negative( mbedtls_mpi *N, signed char c, size_t bits );
#endif

4
tests/suites/test_suite_ecp.function
View File

@ -1216,14 +1216,14 @@ void fix_negative( data_t *N_bin, int c, int bits )
mbedtls_mpi_init( &M );
mbedtls_mpi_init( &N );
/* C = - c * 2^bits */
/* C = - c * 2^bits (positive since c is negative) */
TEST_EQUAL( 0, mbedtls_mpi_lset( &C, -c ) );
TEST_EQUAL( 0, mbedtls_mpi_shift_l( &C, bits ) );
TEST_EQUAL( 0, mbedtls_mpi_read_binary( &N, N_bin->x, N_bin->len ) );
TEST_EQUAL( 0, mbedtls_mpi_grow( &N, C.n ) );
/* M = - ( C - N ) */
/* M = N - C = - ( C - N ) (expected result of fix_negative) */
TEST_EQUAL( 0, mbedtls_mpi_sub_mpi( &M, &N, &C ) );
mbedtls_ecp_fix_negative( &N, c, bits );