[PATCH] crypto: lib - Use swap() in mpi_powm()

From: Jiapeng Chong
Date: Thu Jun 13 2024 - 23:10:03 EST


Use existing swap() function rather than duplicating its implementation.

./lib/crypto/mpi/mpi-pow.c:211:11-12: WARNING opportunity for swap().
./lib/crypto/mpi/mpi-pow.c:239:12-13: WARNING opportunity for swap().

Reported-by: Abaci Robot <abaci@xxxxxxxxxxxxxxxxx>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=9327
Signed-off-by: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
---
lib/crypto/mpi/mpi-pow.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/lib/crypto/mpi/mpi-pow.c b/lib/crypto/mpi/mpi-pow.c
index 2fd7a46d55ec..67fbd4c2503d 100644
--- a/lib/crypto/mpi/mpi-pow.c
+++ b/lib/crypto/mpi/mpi-pow.c
@@ -176,7 +176,6 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)

for (;;) {
while (c) {
- mpi_ptr_t tp;
mpi_size_t xsize;

/*if (mpihelp_mul_n(xp, rp, rp, rsize) < 0) goto enomem */
@@ -207,9 +206,7 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
xsize = msize;
}

- tp = rp;
- rp = xp;
- xp = tp;
+ swap(rp, xp);
rsize = xsize;

if ((mpi_limb_signed_t) e < 0) {
@@ -235,9 +232,7 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
xsize = msize;
}

- tp = rp;
- rp = xp;
- xp = tp;
+ swap(rp, xp);
rsize = xsize;
}
e <<= 1;
--
2.20.1.7.g153144c