[hf seos] Carry when incrementing

Author: aaronjamt

client/src/cmdhfseos.c

@@ -163,7 +163,12 @@ static int decrypt_cryptogram(uint8_t *key, uint8_t *input, uint8_t *out, int in
 }
 
 static void increment_command_wrapper(uint8_t *input, int input_len) {
-    input[input_len - 1]++; // Increment the last element of the header by 1
+    // Increment the last element of the header by 1
+    // If it overflows, increment the next-to-last, and so on
+    for (uint8_t i=0; i<input_len-1; i++) {
+        input[input_len - 1 - i]++;
+        if (input[input_len - 1 - i] != 0x00) return;
+    }
 }
 
 static void padToBlockSize(const uint8_t *input, int *inputSize, int blockSize, uint8_t *output) {