libbb: code shrink in des encryption, in setup_salt()

function                                             old     new   delta
pw_encrypt                                           978     971      -7
.rodata                                           108208  108192     -16
des_crypt                                           1211    1181     -30
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-53)             Total: -53 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/cryptpw.tests b/testsuite/cryptpw.tests
index 8ec476c..0dd91fe 100755
--- a/testsuite/cryptpw.tests
+++ b/testsuite/cryptpw.tests
@@ -7,6 +7,20 @@
 
 # testing "description" "command" "result" "infile" "stdin"
 
+#optional USE_BB_CRYPT
+testing "cryptpw des 12" \
+	"cryptpw -m des QWErty '123456789012345678901234567890'" \
+	'12MnB3PqfVbMA\n' "" ""
+
+testing "cryptpw des 55" \
+	"cryptpw -m des QWErty 55" \
+	'55tgFLtkT1Y72\n' "" ""
+
+testing "cryptpw des zz" \
+	"cryptpw -m des QWErty zz" \
+	'zzIZaaXWOkxVk\n' "" ""
+#SKIP=
+
 optional USE_BB_CRYPT_SHA
 testing "cryptpw sha256" \
 	"cryptpw -m sha256 QWErty '123456789012345678901234567890'" \