patches: support_extended_length APDU patch

patches/support_extended_length.patch

@@ -0,0 +1,44 @@
+diff --git a/src/fr/anssi/smartpgp/Constants.java b/src/fr/anssi/smartpgp/Constants.java
+index b3c0f80..2ee1107 100644
+--- a/src/fr/anssi/smartpgp/Constants.java
++++ b/src/fr/anssi/smartpgp/Constants.java
+@@ -30,7 +30,7 @@ public final class Constants {
+     protected static final short INTERNAL_BUFFER_MAX_LENGTH =
+         (short)0x500;
+ 
+-    protected static final short APDU_MAX_LENGTH = (short)256;
++    protected static final short APDU_MAX_LENGTH = (short)0x400;
+ 
+     protected static final byte[] KEY_DERIVATION_FUNCTION_DEFAULT = {
+         (byte)0x81, (byte)0x01, (byte)0x00
+@@ -147,7 +147,7 @@ public final class Constants {
+         (byte)0x73, /* card capabilities */
+         (byte)0xC0, /* 1st byte: "methods supported" see ISO 7816-4 */
+         (byte)0x01, /* 2nd byte: "data coding byte" idem */
+-        (byte)0x80, /* 3rd byte: command chaining (not extended length by default as all readers do not support them...) */
++        (byte)0xC0, /* 3rd byte: command chaining + extended length */
+ 
+         (byte)0x05, /* status indicator byte : operational state */
+         (byte)0x90, /* SW1 */
+diff --git a/src/fr/anssi/smartpgp/SmartPGPApplet.java b/src/fr/anssi/smartpgp/SmartPGPApplet.java
+index c47870f..78d446d 100644
+--- a/src/fr/anssi/smartpgp/SmartPGPApplet.java
++++ b/src/fr/anssi/smartpgp/SmartPGPApplet.java
+@@ -25,7 +25,7 @@ import javacard.security.*;
+ import javacardx.apdu.*;
+ import javacardx.crypto.*;
+ 
+-public final class SmartPGPApplet extends Applet {
++public final class SmartPGPApplet extends Applet implements ExtendedLength {
+ 
+     private final Persistent data;
+ 
+@@ -104,7 +104,7 @@ public final class SmartPGPApplet extends Applet {
+         short blen = apdu.setIncomingAndReceive();
+ 
+         final short lc = apdu.getIncomingLength();
+-        final short offcdata = ISO7816.OFFSET_CDATA;
++        final short offcdata = apdu.getOffsetCdata();
+ 
+         short off = transients.chainingInputLength();
+