diff options
Diffstat (limited to 'cipher/rsa.c')
| -rw-r--r-- | cipher/rsa.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/cipher/rsa.c b/cipher/rsa.c index 84a1af0e5..51b76404f 100644 --- a/cipher/rsa.c +++ b/cipher/rsa.c @@ -341,22 +341,29 @@ secret(MPI output, MPI input, RSA_secret_key *skey ) mpi_set_highbit (rr, rr_nbits - 1); mpi_sub_ui( h, skey->p, 1 ); mpi_mul ( D_blind, h, rr ); + mpi_free ( rr ); mpi_fdiv_r( h, skey->d, h ); mpi_add ( D_blind, D_blind, h ); + mpi_free ( h ); mpi_powm ( m1, input, D_blind, skey->p ); + h = mpi_alloc_secure (nlimbs); + rr = mpi_alloc_secure ( (rr_nbits + BITS_PER_MPI_LIMB-1)/BITS_PER_MPI_LIMB ); + /* d_blind = (d mod (q-1)) + (q-1) * r */ /* m2 = c ^ d_blind mod q */ randomize_mpi (rr, rr_nbits, 0); mpi_set_highbit (rr, rr_nbits - 1); mpi_sub_ui( h, skey->q, 1 ); mpi_mul ( D_blind, h, rr ); + mpi_free ( rr ); mpi_fdiv_r( h, skey->d, h ); mpi_add ( D_blind, D_blind, h ); + mpi_free ( h ); mpi_powm ( m2, input, D_blind, skey->q ); - mpi_free ( rr ); mpi_free ( D_blind ); + h = mpi_alloc_secure (nlimbs); /* h = u * ( m2 - m1 ) mod q */ mpi_sub( h, m2, m1 ); |