libbb: random hunt for statics

function                                             old     new   delta
bb_askpass                                           306     321     +15
pw_encrypt                                            38      39      +1
static.passwd                                         64       4     -60
static.cipher                                        128       4    -124
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/2 up/down: 16/-184)          Total: -168 bytes

# size busybox_old busybox_unstripped
   text    data     bss     dec     hex filename
 683705    2704   14240  700649   ab0e9 busybox_old
 683721    2704   14064  700489   ab049 busybox_unstripped

1 files changed, 5 insertions, 7 deletions

diff --git a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
index d546bc883..e9cf4e3b8 100644
--- a/libbb/pw_encrypt.c
+++ b/libbb/pw_encrypt.c
@@ -12,18 +12,16 @@
 
 char *pw_encrypt(const char *clear, const char *salt)
 {
-        static char cipher[128];
-        char *cp;
+        /* Was static char[BIGNUM]. Malloced thing works as well */
+        static char *cipher;
 
 #if 0 /* was CONFIG_FEATURE_SHA1_PASSWORDS, but there is no such thing??? */
         if (strncmp(salt, "$2$", 3) == 0) {
                 return sha1_crypt(clear);
         }
 #endif
-        cp = (char *) crypt(clear, salt);
-        /* if crypt (a nonstandard crypt) returns a string too large,
-           truncate it so we don't overrun buffers and hope there is
-           enough security in what's left */
-        safe_strncpy(cipher, cp, sizeof(cipher));
+
+        free(cipher);
+        cipher = xstrdup(crypt(clear, salt));
         return cipher;
 }