dropbear: bump to version 0.53.1

Changelog @ http://matt.ucc.asn.au/dropbear/CHANGES

Since some build-time defaults have changed that make dropbear somewhat
bigger we introduce a new option to optimize dropbear for size.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/dropbear/Config.in

@@ -13,3 +13,13 @@ config BR2_PACKAGE_DROPBEAR_DISABLE_REVERSEDNS
 	  Disable reverse DNS lookups on connection. This can be handy
 	  on systems without working DNS, as connections otherwise
 	  stall until DNS times out.
+
+config BR2_PACKAGE_DROPBEAR_SMALL
+	bool "optimize for size"
+	default y
+	depends on BR2_PACKAGE_DROPBEAR
+	help
+	  Compile dropbear for the smallest possible binary size.
+
+	  Tradeoffs are slower hashes and ciphers, and disabling of the
+	  blowfish cipher.

package/dropbear/dropbear.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-DROPBEAR_VERSION = 0.52
+DROPBEAR_VERSION = 0.53.1
 DROPBEAR_SOURCE = dropbear-$(DROPBEAR_VERSION).tar.gz
 DROPBEAR_SITE = http://matt.ucc.asn.au/dropbear/releases
 DROPBEAR_DEPENDENCIES = zlib
@@ -27,10 +27,25 @@ define DROPBEAR_DISABLE_REVERSE_DNS
 	$(SED) 's,^#define DO_HOST_LOOKUP.*,/* #define DO_HOST_LOOKUP */,' $(@D)/options.h
 endef
 
+define DROPBEAR_BUILD_SMALL
+	echo "#define DROPBEAR_SMALL_CODE" >>$(@D)/options.h
+	echo "#define NO_FAST_EXPTMOD" >>$(@D)/options.h
+endef
+
+define DROPBEAR_BUILD_FEATURED
+	echo "#define DROPBEAR_BLOWFISH" >>$(@D)/options.h
+endef
+
 ifeq ($(BR2_PACKAGE_DROPBEAR_DISABLE_REVERSEDNS),y)
 DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_DISABLE_REVERSE_DNS
 endif
 
+ifeq ($(BR2_PACKAGE_DROPBEAR_SMALL),y)
+DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_BUILD_SMALL
+else
+DROPBEAR_POST_EXTRACT_HOOKS += DROPBEAR_BUILD_FEATURED
+endif
+
 define DROPBEAR_INSTALL_TARGET_CMDS
 	$(INSTALL) -m 755 $(@D)/dropbearmulti $(TARGET_DIR)/usr/sbin/dropbear
 	for f in $(DROPBEAR_TARGET_BINS); do \