3 files changed, 30 insertions, 0 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 32f3e5ae2be5..4af07ec7f2de 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -276,4 +276,11 @@ config CORDIC
           so its calculations are in fixed point. Modules can select this
           when they require this function. Module will be called cordic.
 
+config MPILIB
+        tristate "Multiprecision maths library"
+        help
+          Multiprecision maths library from GnuPG.
+          It is used to implement RSA digital signature verification,
+          which is used by IMA/EVM digital signature extension.
+
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index a4da283f5dc0..6ba8cbf4c72f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -115,6 +115,8 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
 
 obj-$(CONFIG_CORDIC) += cordic.o
 
+obj-$(CONFIG_MPILIB) += mpi/
+
 hostprogs-y     := gen_crc32table
 clean-files     := crc32table.h
 
diff --git a/lib/mpi/Makefile b/lib/mpi/Makefile
new file mode 100644
index 000000000000..45ca90a8639c
--- /dev/null
+++ b/lib/mpi/Makefile
@@ -0,0 +1,21 @@
+#
+# MPI multiprecision maths library (from gpg)
+#
+
+obj-$(CONFIG_MPILIB) = mpi.o
+
+mpi-y = \
+        generic_mpih-lshift.o           \
+        generic_mpih-mul1.o             \
+        generic_mpih-mul2.o             \
+        generic_mpih-mul3.o             \
+        generic_mpih-rshift.o           \
+        generic_mpih-sub1.o             \
+        generic_mpih-add1.o             \
+        mpicoder.o                      \
+        mpi-bit.o                       \
+        mpih-cmp.o                      \
+        mpih-div.o                      \
+        mpih-mul.o                      \
+        mpi-pow.o                       \
+        mpiutil.o