linux-toradex.git/lib/mpi/mpi-cmp.c, branch v6.4-rc1

lib/mpi: Extend the MPI library

2020-09-25T07:48:53+00:00

Expand the mpi library based on libgcrypt, and the ECC algorithm of
mpi based on libgcrypt requires these functions.
Some other algorithms will be developed based on mpi ecc, such as SM2.

Signed-off-by: Tianjia Zhang 
Tested-by: Xufeng Zhang 
Signed-off-by: Herbert Xu

MPILIB: Fix comparison of negative MPIs

2015-01-14T16:10:12+00:00

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 
Signed-off-by: David Howells 
Acked-by: Dmitry Kasatkin

MPILIB: Deobfuscate mpi_cmp

2015-01-14T15:15:57+00:00

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 
Signed-off-by: David Howells 
Acked-by: Dmitry Kasatkin

MPILIB: Reinstate mpi_cmp[_ui]() and export for RSA signature verification

2012-10-08T03:20:15+00:00

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 
Signed-off-by: Rusty Russell

Revert "crypto: GnuPG based MPI lib - additional sources (part 4)"

2012-05-26T01:50:44+00:00

This reverts commit 7e8dec918ef8e0f68b4937c3c50fa57002077a4d.

RSA verification implementation does not use this code.
James Morris has asked to remove that.

Signed-off-by: Dmitry Kasatkin 
Requested-by: James Morris 
Signed-off-by: James Morris

crypto: GnuPG based MPI lib - additional sources (part 4)

2011-11-09T09:47:26+00:00

Adds the multi-precision-integer maths library which was originally taken
from GnuPG and ported to the kernel by (among others) David Howells.
This version is taken from Fedora kernel 2.6.32-71.14.1.el6.
The difference is that checkpatch reported errors and warnings have been fixed.

This library is used to implemenet RSA digital signature verification
used in IMA/EVM integrity protection subsystem.

Due to patch size limitation, the patch is divided into 4 parts.

This code is unnecessary for RSA digital signature verification,
but for completeness it is included here and can be compiled,
if CONFIG_MPILIB_EXTRA is enabled.

Signed-off-by: Dmitry Kasatkin