diff --git a/lib/Kconfig b/lib/Kconfig
index 32f3e5a..4af07ec 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -276,4 +276,11 @@
 	  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 a4da283..6ba8cbf4 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -115,6 +115,8 @@
 
 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 0000000..45ca90a
--- /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