jsiConsolePrint(); usage example?

Best bet is to have a look at src/jwrap_*.c - there are loads of functions in there that work the same way. Basically in the comment at the start you describe what the arguments are. I guess you'll either want int32 (a 32 bit integer) or JsVar (a JavaScript variable, that might be something like an array).

Actually unpacking something like an array into a C array is a bit more painful though - you'd probably want to see something like this as an example

/*JSON{
  "type" : "staticmethod",
  "class" : "Crypto",
  "name" : "aescbc",
  "generate" : "jswrap_crypto_aescbc",
  "params" : [
    ["key","int32","A description for users"],
    ["iv","int32","A description for users"],
    ["hashKey","int32","A description for users"],
    ["data","JsVar","A description for users"]
   ]
}*/
void jswrap_crypto_aescbc(int key, int iv, int hashkey, JsVar *data)
{
  if (!jsvIsIterable(data)) {
    jsExceptionHere(JSET_ERROR, "Expecting an array/string for 4th argument, got %t", data);
    return;
  }

  char data[128];
  JsvIterator it;
  jsvIteratorNew(&it, data);
  unsigned int i = 0;
  while (jsvIteratorHasElement(&it) && i<sizeof(data)) {
    data[i++] = (char)jsvIteratorGetIntegerValue(&it);
    jsvIteratorNext(&it);
  }
  jsvIteratorFree(&it);    

  // do stuff

  // write result back
  jsvIteratorNew(&it, data);
  i=0;
  while (jsvIteratorHasElement(&it) && i<sizeof(data)) {
    jsvUnLock(jsvIteratorSetValue(&it, jsvNewFromInteger(data[i++])));
    jsvIteratorNext(&it);
  }
  jsvIteratorFree(&it);
}

I haven't actually tested that, but it should work...