dropbear: disable 3des, cbc mode, dss support, saves about 5k gzipped

While technically required by the RFC, they are usually completely
unused (DSA), or have security issues (3DES, CBC)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 46814

package/network/services/dropbear/patches/120-openwrt_options.patch

@@ -18,7 +18,12 @@
  
  /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
  #define ENABLE_USER_ALGO_LIST
-@@ -95,8 +95,8 @@ much traffic. */
+@@ -91,16 +91,16 @@ much traffic. */
+  * Including multiple keysize variants the same cipher 
+  * (eg AES256 as well as AES128) will result in a minimal size increase.*/
+ #define DROPBEAR_AES128
+-#define DROPBEAR_3DES
++/*#define DROPBEAR_3DES*/
  #define DROPBEAR_AES256
  /* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
  /*#define DROPBEAR_BLOWFISH*/
@@ -29,6 +34,11 @@
  
  /* Enable CBC mode for ciphers. This has security issues though
   * is the most compatible with older SSH implementations */
+-#define DROPBEAR_ENABLE_CBC_MODE
++/*#define DROPBEAR_ENABLE_CBC_MODE*/
+ 
+ /* Enable "Counter Mode" for ciphers. This is more secure than normal
+  * CBC mode against certain attacks. It is recommended for security
 @@ -131,9 +131,9 @@ If you test it please contact the Dropbe
   * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
   * which are not the standard form. */
@@ -42,6 +52,15 @@
  #define DROPBEAR_MD5_HMAC
  
  /* You can also disable integrity. Don't bother disabling this if you're
+@@ -146,7 +146,7 @@ If you test it please contact the Dropbe
+  * Removing either of these won't save very much space.
+  * SSH2 RFC Draft requires dss, recommends rsa */
+ #define DROPBEAR_RSA
+-#define DROPBEAR_DSS
++/*#define DROPBEAR_DSS*/
+ /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
+  * code (either ECDSA or ECDH) increases binary size - around 30kB
+  * on x86-64 */
 @@ -189,7 +189,7 @@ If you test it please contact the Dropbe
  
  /* Whether to print the message of the day (MOTD). This doesn't add much code