Reduced buffer sizes, moved static info to flash

firmware/u2f.c

@@ -41,7 +41,7 @@
 
 // About 1/2 Second according to values used in protect.c
 #define U2F_TIMEOUT 840000/2
-#define U2F_OUT_PKT_BUFFER_LEN 128
+#define U2F_OUT_PKT_BUFFER_LEN 16
 
 // Initialise without a cid
 static uint32_t cid = CID_BROADCAST;
@@ -171,7 +171,7 @@ void u2fhid_read(const U2FHID_FRAME *f)
 	static uint8_t seq, cmd;
 	static uint32_t len;
 	static uint8_t *buf_ptr;
-	static uint8_t buf[7609];
+	static uint8_t buf[57+7*59];
 
 	if ((f->cid != CID_BROADCAST) && (f->cid != cid)) {
 		return; // Not for us
@@ -291,7 +291,7 @@ void u2fhid_init(const U2FHID_INIT_REQ *init_req)
 	f.cid = CID_BROADCAST;
 	f.init.cmd = U2FHID_INIT;
 	f.init.bcnth = 0;
-	f.init.bcntl = sizeof(U2FHID_INIT_RESP);
+	f.init.bcntl = U2FHID_INIT_RESP_SIZE;
 
 	memcpy(resp->nonce, init_req->nonce, sizeof(init_req->nonce));
 	resp->cid = next_cid();

firmware/u2f/u2f_hid.h

@@ -120,6 +120,8 @@ extern "C"
     uint8_t capFlags;		// Capabilities flags  
   } U2FHID_INIT_RESP;
 
+#define U2FHID_INIT_RESP_SIZE 17
+
 // Low-level error codes. Return as negatives.
 
 #define ERR_NONE                0x00	// No error

firmware/u2f/u2f_keys.h

@@ -3,20 +3,14 @@
 
 #include <stdint.h>
 
-uint8_t U2F_ATT_PRIV_KEY[] = {0x71, 0x26, 0xac, 0x2b, 0xf6, 0x44, 0xdc, 0x61,
-			      0x86, 0xad, 0x83, 0xef, 0x1f, 0xcd, 0xf1, 0x2a,
-			      0x57, 0xb5, 0xcf, 0xa2, 0x00, 0x0b, 0x8a, 0xd0,
-			      0x27, 0xe9, 0x56, 0xe8, 0x54, 0xc5, 0x0a, 0x8b};
-
-uint8_t U2F_ATT_PUB_KEY[] = {
-    0x04, 0xd9, 0x18, 0xbd, 0xfa, 0x8a, 0x54, 0xac, 0x92, 0xe9, 0x0d,
-    0xa9, 0x1f, 0xca, 0x7a, 0xa2, 0x64, 0x54, 0xc0, 0xd1, 0x73, 0x36,
-    0x31, 0x4d, 0xde, 0x83, 0xa5, 0x4b, 0x86, 0xb5, 0xdf, 0x4e, 0xf0,
-    0x52, 0x65, 0x9a, 0x1d, 0x6f, 0xfc, 0xb7, 0x46, 0x7f, 0x1a, 0xcd,
-    0xdb, 0x8a, 0x33, 0x08, 0x0b, 0x5e, 0xed, 0x91, 0x89, 0x13, 0xf4,
-    0x43, 0xa5, 0x26, 0x1b, 0xc7, 0x7b, 0x68, 0x60, 0x6f, 0xc1};
+const uint8_t U2F_ATT_PRIV_KEY[] = {
+	0x71, 0x26, 0xac, 0x2b, 0xf6, 0x44, 0xdc, 0x61,
+	0x86, 0xad, 0x83, 0xef, 0x1f, 0xcd, 0xf1, 0x2a,
+	0x57, 0xb5, 0xcf, 0xa2, 0x00, 0x0b, 0x8a, 0xd0,
+	0x27, 0xe9, 0x56, 0xe8, 0x54, 0xc5, 0x0a, 0x8b
+};
 
-uint8_t U2F_ATT_CERT[] = {
+const uint8_t U2F_ATT_CERT[] = {
     0x30, 0x82, 0x01, 0x19, 0x30, 0x81, 0xC0, 0x02, 0x09, 0x00, 0x8B, 0x3F,
     0xA6, 0x46, 0xDE, 0x01, 0xCB, 0xB8, 0x30, 0x0A, 0x06, 0x08, 0x2A, 0x86,
     0x48, 0xCE, 0x3D, 0x04, 0x03, 0x02, 0x30, 0x15, 0x31, 0x13, 0x30, 0x11,