Ton

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int now() asm "NOW";
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int cell_hash(cell c)
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asm "HASHCU";
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int slice_hash(slice s)
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asm "HASHSU";
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int check_signature(int hash, slice signature, int public_key)
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asm "CHKSIGNU";
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;; () throw_if(int excno, int cond) impure
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;; asm "THROWARGIF";
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cell get_data() asm "c4 PUSH";
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() set_data(cell c) impure asm "c4 POP";
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() accept_message() impure asm "ACCEPT";
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slice begin_parse(cell c) asm "CTOS";
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() end_parse(slice s) impure asm "ENDS";
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(cell, slice) load_ref(slice s) asm "LDREF";
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(int, slice) zload_int(slice s, int len) asm "LDIX";
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(int, slice) zload_uint(slice s, int len) asm "LDUX";
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int zpreload_int(slice s, int len) asm "PLDIX";
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int zpreload_uint(slice s, int len) asm "PLDUX";
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(slice, slice) load_bits(slice s, int len) asm "LDSLICEX";
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slice preload_bits(slice s, int len) asm "PLDSLICEX";
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cell set_idict_ref(cell value, int index, cell dict, int key_len) asm "DICTISETREF";
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builder begin_cell() asm "NEWC";
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builder store_ref(cell c, builder b) asm "STREF";
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builder zstore_uint(int x, builder b, int len) asm "STUX";
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builder zstore_int(int x, builder b, int len) asm "STIX";
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cell end_cell(builder b) asm "ENDC";
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;; Simple configuration smart contract
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() recv_internal(cell in_msg) impure {
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  ;; do nothing for internal messages
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}
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() recv_external(cell in_msg) impure {
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  var (signature, cs0) = load_bits(begin_parse(in_msg), 512);
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  var (msg_seqno, cs) = zload_uint(cs0, 32);
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  (var valid_until, cs) = zload_uint(cs, 32);
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  throw_if(35, valid_until < now());
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  var (cfg_dict, cs2) = load_ref(begin_parse(get_data()));
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  (var stored_seqno, cs2) = zload_uint(cs2, 32);
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  (var public_key, cs2) = zload_uint(cs2, 256);
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  end_parse(cs2);
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  throw_unless(33, msg_seqno == stored_seqno);
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  throw_unless(34, check_signature(slice_hash(cs0), signature, public_key));
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  accept_message();
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  (var param_index, cs) = zload_uint(cs, 32);
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  (var param_value, cs) = load_ref(cs);
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  end_parse(cs);
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;;  cfg_dict = set_idict_ref(param_value, param_index, cfg_dict, 32);
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;;  var cb = begin_cell();
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;;  cb = store_ref(cfg_dict, cb);
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  var cb = store_ref(set_idict_ref(param_value, param_index, cfg_dict, 32), begin_cell());
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  cb = zstore_uint(stored_seqno + 1, cb, 32);
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  cb = zstore_uint(public_key, cb, 256);
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  set_data(end_cell(cb));
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}
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