uclibc insists on having 70k static buffer for crypt.

For bbox it's not acceptable. Roll our own des and md5 crypt
implementation. Against older uclibc:

   text    data     bss     dec     hex filename
 759945     604    6684  767233   bb501 busybox_old
 759766     604    6684  767054   bb44e busybox_unstripped

so, we still save on code size.

4 files changed, 35 insertions, 5 deletions

diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
index 5dc7a9b..230ab0f 100644
--- a/loginutils/chpasswd.c
+++ b/loginutils/chpasswd.c
@@ -47,7 +47,7 @@ int chpasswd_main(int argc ATTRIBUTE_UNUSED, char **argv)
 				strcpy(salt, "$1$");
 				rnd = crypt_make_salt(salt + 3, 4, rnd);
 			}
-			pass = pw_encrypt(pass, salt);
+			pass = pw_encrypt(pass, salt, 0);
 		}
 
 		/* This is rather complex: if user is not found in /etc/shadow,
diff --git a/loginutils/cryptpw.c b/loginutils/cryptpw.c
index 68f5e80..1acbc6d 100644
--- a/loginutils/cryptpw.c
+++ b/loginutils/cryptpw.c
@@ -7,6 +7,30 @@
 
 #include "libbb.h"
 
+#define TESTING 0
+
+/*
+set TESTING to 1 and pipe some file through this script
+if you played with bbox's crypt implementation.
+
+while read line; do
+	n=`./busybox cryptpw -a des -- "$line"`
+	o=`./busybox_old cryptpw -a des -- "$line"`
+	test "$n" != "$o" && {
+		echo n="$n"
+		echo o="$o"
+		exit
+	}
+	n=`./busybox cryptpw -- "$line"`
+	o=`./busybox_old cryptpw -- "$line"`
+	test "$n" != "$o" && {
+		echo n="$n"
+		echo o="$o"
+		exit
+	}
+done
+ */
+
 int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cryptpw_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
@@ -18,11 +42,17 @@ int cryptpw_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		//((uint32_t*)&salt)[0] = '$' + '1'*0x100 + '$'*0x10000;
 		/* Hope one day gcc will do it itself (inlining strcpy) */
 		crypt_make_salt(salt + 3, 4, 0); /* md5 */
+#if TESTING
+		strcpy(salt + 3, "ajg./bcf");
+#endif
 	} else {
 		crypt_make_salt(salt, 1, 0);     /* des */
+#if TESTING
+		strcpy(salt, "a.");
+#endif
 	}
 
-	puts(pw_encrypt(argv[optind] ? argv[optind] : xmalloc_fgetline(stdin), salt));
+	puts(pw_encrypt(argv[optind] ? argv[optind] : xmalloc_fgetline(stdin), salt, 1));
 
 	return 0;
 }
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 3353db1..fad226c 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -24,7 +24,7 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 		orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
 		if (!orig)
 			goto err_ret;
-		cipher = pw_encrypt(orig, pw->pw_passwd); /* returns ptr to static */
+		cipher = pw_encrypt(orig, pw->pw_passwd, 1); /* returns ptr to static */
 		if (strcmp(cipher, pw->pw_passwd) != 0) {
 			syslog(LOG_WARNING, "incorrect password for '%s'",
 				pw->pw_name);
@@ -56,7 +56,7 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 		crypt_make_salt(salt + 3, 4, 0);
 	}
 	/* pw_encrypt returns ptr to static */
-	ret = xstrdup(pw_encrypt(newp, salt));
+	ret = xstrdup(pw_encrypt(newp, salt, 1));
 	/* whee, success! */
 
  err_ret:
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
index 17bb15e..f52ce8a 100644
--- a/loginutils/sulogin.c
+++ b/loginutils/sulogin.c
@@ -81,7 +81,7 @@ int sulogin_main(int argc ATTRIBUTE_UNUSED, char **argv)
 			bb_info_msg("Normal startup");
 			return 0;
 		}
-		if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
+		if (strcmp(pw_encrypt(cp, pwd->pw_passwd, 1), pwd->pw_passwd) == 0) {
 			break;
 		}
 		bb_do_delay(FAIL_DELAY);