Just use md5sum
diff --git a/regtest/common.bash b/regtest/common.bash
index ce629ff..75abe54 100644
--- a/regtest/common.bash
+++ b/regtest/common.bash
@@ -33,15 +33,7 @@ TMPLOG="$LOGDIR/tmplog.txt"
 
 UNAME="$(uname -s)"
 
-if [ "$UNAME" = Darwin ]; then
-    MD5SUM="md5 -r"
-else
-    MD5SUM=md5sum
-fi
-
-if ! $MD5SUM $RNDSEQ >/dev/null 2>&1; then
-    MD5SUM=../simple-md5sum
-fi
+MD5SUM=md5sum
 
 nbfailed=0