Merge pull request #44 from ElrondNetwork/get-address-auth-token

Get address auth token

Makefile

@@ -24,7 +24,7 @@ APP_LOAD_PARAMS= --curve ed25519 --path "44'/508'" --appFlags 0x240 $(COMMON_LOA
 
 APPVERSION_M:=$(if $(APPVERSION_M),$(APPVERSION_M),1)
 APPVERSION_N:=$(if $(APPVERSION_N),$(APPVERSION_N),0)
-APPVERSION_P:=$(if $(APPVERSION_P),$(APPVERSION_P),13)
+APPVERSION_P:=$(if $(APPVERSION_P),$(APPVERSION_P),14)
 APPVERSION=$(APPVERSION_M).$(APPVERSION_N).$(APPVERSION_P)
 APPNAME = "Elrond"
 

src/address_helpers.c

@@ -0,0 +1,66 @@
+#include <stdint.h>
+#include <stddef.h>
+
+#include "bech32.h"
+#include "globals.h"
+#include "get_private_key.h"
+#include "os.h"
+#include "ux.h"
+
+/* return false in case of error, true otherwise */
+bool get_public_key(uint32_t account_number, uint32_t index, uint8_t *public_key_array) {
+    cx_ecfp_private_key_t private_key;
+    cx_ecfp_public_key_t public_key;
+    bool error = false;
+
+    if (!get_private_key(account_number, index, &private_key)) {
+        return false;
+    }
+
+    BEGIN_TRY {
+        TRY {
+            cx_ecfp_generate_pair(CX_CURVE_Ed25519, &public_key, &private_key, 1);
+        }
+        CATCH_ALL {
+            error = true;
+        }
+        FINALLY {
+            memset(&private_key, 0, sizeof(private_key));
+        }
+    }
+    END_TRY;
+
+    if (error) {
+        return false;
+    }
+
+    for (int i = 0; i < 32; i++) {
+        public_key_array[i] = public_key.W[64 - i];
+    }
+    if ((public_key.W[32] & 1) != 0) {
+        public_key_array[31] |= 0x80;
+    }
+
+    return true;
+}
+
+// TODO: maybe make this function more general and extract to a new file binary <-> hex converters
+void get_address_hex_from_binary(uint8_t *public_key, char *address) {
+    const char hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+    uint8_t i;
+
+    for (i = 0; i < 32; i++) {
+        address[i * 2] = hex[public_key[i] >> 4];
+        address[i * 2 + 1] = hex[public_key[i] & 0xf];
+    }
+    address[64] = '\0';
+}
+
+// TODO: analyze and refactor this function
+void get_address_bech32_from_binary(uint8_t *public_key, char *address) {
+    uint8_t buffer[33];
+
+    memmove(buffer, public_key, 32);
+    buffer[32] = '\0';
+    bech32EncodeFromBytes(address, HRP, buffer, 33);
+}

src/address_helpers.h

@@ -0,0 +1,12 @@
+#ifndef _ADDRESS_HELPERS_H_
+#define _ADDRESS_HELPERS_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+bool get_public_key(uint32_t account_number, uint32_t index, uint8_t *public_key_array);
+void get_address_hex_from_binary(uint8_t *public_key, char *address);
+void get_address_bech32_from_binary(uint8_t *public_ey, char *address);
+
+#endif

src/constants.h

@@ -64,3 +64,12 @@ typedef enum {
 #define GAS_PER_DATA_BYTE     1500
 #define GAS_PRICE_DIVIDER     100
 #define MIN_GAS_LIMIT         50000
+#define MAX_AUTH_TOKEN_LEN    100
+#define BECH32_ADDRESS_LEN    62
+#define HASH_LEN              32
+#define MESSAGE_SIGNATURE_LEN 64
+#define SHA3_KECCAK_BITS      256
+#define PUBLIC_KEY_LEN        32
+
+static const char PREPEND[] = "\x17"
+                              "Elrond Signed Message:\n";