mirror/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-03-28 19:21:08 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fix ECDSA signature verification edge-case

Browse Source 
For R and S equal to 1, ensure the public key is checked
for validity.

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2022-08-10 11:26:24 +01:00
parent 1fdb8e8c17
commit c947751a5f
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
library/ecp.c
View File

@ -2666,14 +2666,17 @@ static int mbedtls_ecp_mul_shortcuts( mbedtls_ecp_group *grp,
if( mbedtls_mpi_cmp_int( m, 0 ) == 0 )
{
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, P ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_set_zero( R ) );
}
else if( mbedtls_mpi_cmp_int( m, 1 ) == 0 )
{
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, P ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_copy( R, P ) );
}
else if( mbedtls_mpi_cmp_int( m, -1 ) == 0 )
{
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, P ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_copy( R, P ) );
MPI_ECP_NEG( &R->Y );
}