verifying signature & parsing input

contracts/imports/dns-utils.fc

@@ -82,10 +82,10 @@ int check_domain_string(slice domain) {
         if (~ need_break) {
             int char = str~load_uint(8);
             need_break = char == 59; ;; ';'
-            if (~ need_break) {
             i += 8;
-            }
+            if (~ need_break) {
                 result1~store_uint(char, 8);
+            }
             if (~ need_break & (i >= len)) {
                 throw(259);  ;; no ';' found
             }
@@ -94,6 +94,59 @@ int check_domain_string(slice domain) {
     return (result1.end_cell().begin_parse(), str~load_bits(len - i));
 }
 
+(slice) decode_asciicode(slice str) {
+    ;; Decode the signature encoded into a slice of [a-zA-Z0-9_-] characters
+    ;; into a slice of bytes.
+    ;; Each byte of the input encodes 8 bytes of the output
+
+    int len = slice_bits(str);
+    int need_break = 0;
+    builder result = begin_cell();
+    do {
+        need_break = len == 0;
+        if (~ need_break) {
+            int char = str~load_uint(8);
+            int byte = 0;
+            if (char >= 65) {
+                if (char <= 90) {   ;; a-z -> 0-25
+                    byte = char - 65;
+                } else {
+                    if (char >= 97) {   ;; A-Z -> 26-51
+                        if (char <= 122) {
+                            byte = char - 71;
+                        } else {
+                            if (char >= 48) {   ;; 0-9 -> 52-61
+                                if (char <= 57) {
+                                    byte = char + 4;
+                                } else {
+                                    if (char == 45) {   ;; - -> 62
+                                        byte = 62;
+                                    } else {
+                                        if (char == 95) {   ;; _ -> 63
+                                            byte = 63;
+                                        } else {
+                                            throw(260);  ;; invalid character
+                                        }
+                                    }
+                                }
+                            } else {
+                                throw(260);  ;; invalid character
+                            }
+                        }
+                    } else {
+                        throw(260);  ;; invalid character
+                    }
+                }
+            } else {
+                throw(260);  ;; invalid character
+            }
+            result~store_uint(byte, 6);
+            len -= 8;
+        }
+    } until (need_break);
+    return result.end_cell().begin_parse();
+}
+
 (int, int) get_min_price_config(int domain_char_count) {
     if (domain_char_count == 4) {
         return (1000, 100);

contracts/main.ts

@@ -63,9 +63,10 @@ export function transferOwnership(params: { newOwnerAddress: Address }): Cell {
 }
 
 export function createItem(params: { domain: String }): Cell {
+  let signature = '000';
   return beginCell()
       .storeUint(0, 32)
-      .storeRef(makeSnakeCell(Buffer.from(params.domain)))
+      .storeRef(makeSnakeCell(Buffer.from(params.domain + ';' + signature)))
       .endCell();
 }
 

contracts/nft-collection.fc

@@ -4,7 +4,7 @@
 #include "imports/params.fc";
 
 ;; -1 if needed, 0 if not
-const signature_needed = -1;
+const signature_needed = 0;
 
 ;; storage scheme
 ;; cell collection_content
@@ -71,9 +71,9 @@ slice calculate_nft_item_address(int wc, cell state_init) {
     send_raw_message(msg.end_cell(), 64); ;; carry all the remaining value of the inbound message, fee deducted from amount
 }
 
-int verify_signature(cell signature, slice sender_address, slice domain, int owner_key) {
+int verify_signature(slice signature, slice sender_address, slice domain, int owner_key) {
-    cell option_data = begin_cell().store_slice(domain).store_slice(sender_address).end_cell();
+    cell option_data = begin_cell().store_slice(my_address()).store_slice(domain).store_slice(sender_address).end_cell();
-    return check_signature(slice_hash(option_data.begin_parse()), signature.begin_parse(), owner_key);
+    return check_signature(slice_hash(option_data.begin_parse()), signature, owner_key);
 }
 
 () recv_internal(int msg_value, cell in_msg_full, slice in_msg_body) impure {
@@ -93,7 +93,8 @@ int verify_signature(cell signature, slice sender_address, slice domain, int own
 
     if (op == 0) { ;; deploy new nft
         int now_time = now();
-        slice domain = read_domain_from_comment(in_msg_body);
+        slice body = read_comment(in_msg_body);
+        (slice domain, slice signature_encoded) = split_by_semicolon(body);
         int len = slice_bits(domain);
         int price = calcprice(domain, pricing);
         throw_unless(204, msg_value >= price);
@@ -102,9 +103,8 @@ int verify_signature(cell signature, slice sender_address, slice domain, int own
 
         slice sender_address = cs~load_msg_addr();
         if (signature_needed) {
-            ;; todo: do stuff here
+            slice signature = decode_asciicode(signature_encoded);
-;;             cell signature = in_msg_body~load_ref();
+            throw_unless(205, verify_signature(signature, sender_address, domain, key));
-;;             throw_unless(205, verify_signature(signature, sender_address, domain, key));
         }
 
         cell nft_content = begin_cell()