Revert "lib/mpi: Extend the MPI library"

This partially reverts commit a8ea8bdd9df92a0e5db5b43900abb7a288b8a53e.

Most of it is no longer needed since sm2 has been removed.  However,
the following functions have been kept as they have developed other
uses:

mpi_copy

mpi_mod

mpi_test_bit
mpi_set_bit
mpi_rshift

mpi_add
mpi_sub
mpi_addm
mpi_subm

mpi_mul
mpi_mulm

mpi_tdiv_r
mpi_fdiv_r

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 10 insertions, 36 deletions

diff --git a/lib/crypto/mpi/mpi-cmp.c b/lib/crypto/mpi/mpi-cmp.c
index 0835b6213235..ceaebe181cd7 100644
--- a/lib/crypto/mpi/mpi-cmp.c
+++ b/lib/crypto/mpi/mpi-cmp.c
@@ -45,54 +45,28 @@ int mpi_cmp_ui(MPI u, unsigned long v)
 }
 EXPORT_SYMBOL_GPL(mpi_cmp_ui);
 
-static int do_mpi_cmp(MPI u, MPI v, int absmode)
+int mpi_cmp(MPI u, MPI v)
 {
-	mpi_size_t usize;
-	mpi_size_t vsize;
-	int usign;
-	int vsign;
+	mpi_size_t usize, vsize;
 	int cmp;
 
 	mpi_normalize(u);
 	mpi_normalize(v);
-
 	usize = u->nlimbs;
 	vsize = v->nlimbs;
-	usign = absmode ? 0 : u->sign;
-	vsign = absmode ? 0 : v->sign;
-
-	/* Compare sign bits.  */
-
-	if (!usign && vsign)
+	if (!u->sign && v->sign)
 		return 1;
-	if (usign && !vsign)
+	if (u->sign && !v->sign)
 		return -1;
-
-	/* U and V are either both positive or both negative.  */
-
-	if (usize != vsize && !usign && !vsign)
+	if (usize != vsize && !u->sign && !v->sign)
 		return usize - vsize;
-	if (usize != vsize && usign && vsign)
-		return vsize + usize;
+	if (usize != vsize && u->sign && v->sign)
+		return vsize - usize;
 	if (!usize)
 		return 0;
 	cmp = mpihelp_cmp(u->d, v->d, usize);
-	if (!cmp)
-		return 0;
-	if ((cmp < 0?1:0) == (usign?1:0))
-		return 1;
-
-	return -1;
-}
-
-int mpi_cmp(MPI u, MPI v)
-{
-	return do_mpi_cmp(u, v, 0);
+	if (u->sign)
+		return -cmp;
+	return cmp;
 }
 EXPORT_SYMBOL_GPL(mpi_cmp);
-
-int mpi_cmpabs(MPI u, MPI v)
-{
-	return do_mpi_cmp(u, v, 1);
-}
-EXPORT_SYMBOL_GPL(mpi_cmpabs);