kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-16 22:39:48 +00:00
Code Issues Releases Packages Activity
linux/lib/mpi/mpi-cmp.c

68 lines
1.6 KiB
Raw Permalink Normal View History

MPILIB: Reinstate mpi_cmp[_ui]() and export for RSA signature verification Reinstate and export mpi_cmp() and mpi_cmp_ui() from the MPI library for use by RSA signature verification as per RFC3447 section 5.2.2 step 1. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-09-21 23:25:22 +01:00
MPILIB: Fix comparison of negative MPIs If u and v both represent negative integers and their limb counts happen to differ, mpi_cmp will always return a positive value - this is obviously bogus. u is smaller than v if and only if it is larger in absolute value. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
2015-01-14 16:10:12 +00:00
MPILIB: Reinstate mpi_cmp[_ui]() and export for RSA signature verification Reinstate and export mpi_cmp() and mpi_cmp_ui() from the MPI library for use by RSA signature verification as per RFC3447 section 5.2.2 step 1. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-09-21 23:25:22 +01:00
MPILIB: Deobfuscate mpi_cmp The condition preceding 'return 1;' makes my head hurt. At this point, we know that u and v have the same sign; if they are negative, they compare opposite to how their absolute values compare (which mpihelp_cmp found for us), otherwise cmp itself is the answer. Negating cmp is ok since mpihelp_cmp returns {-1,0,1}; -INT_MIN==INT_MIN won't bite us. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
2015-01-14 15:15:57 +00:00
MPILIB: Reinstate mpi_cmp[_ui]() and export for RSA signature verification Reinstate and export mpi_cmp() and mpi_cmp_ui() from the MPI library for use by RSA signature verification as per RFC3447 section 5.2.2 step 1. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-09-21 23:25:22 +01:00