Supports 32 bits chainId for signature and matching - the returned V will be wrong and has to be recomputed by the client

src_common/ethUstream.c

@@ -20,7 +20,7 @@
 
 #define MAX_INT256 32
 #define MAX_ADDRESS 20
-#define MAX_V 2
+#define MAX_V 4 
 
 void initTx(txContext_t *context, cx_sha3_t *sha3, txContent_t *content,
             ustreamProcess_t customProcessor, void *extra) {

src_common/ethUstream.h

@@ -58,7 +58,7 @@ typedef struct txContent_t {
     txInt256_t value;
     uint8_t destination[20];
     uint8_t destinationLength;
-    uint8_t v[2];
+    uint8_t v[4];
     uint8_t vLength;
 } txContent_t;