Script decode not decoding 0x21 #8770

bitcoin core v0.13.0.0 decodes the following tx as follows tx hash: c49b3c445c89d832289de0fd3b0281efdcce418333dacd028061e8de9f0a6f10

decoderawtransaction 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

{
  "txid": "c49b3c445c89d832289de0fd3b0281efdcce418333dacd028061e8de9f0a6f10",
  "hash": "c49b3c445c89d832289de0fd3b0281efdcce418333dacd028061e8de9f0a6f10",
  "size": 450,
  "vsize": 450,
  "version": 1,
  "locktime": 0,
  "vin": [
    {
      "txid": "417fa57fba175e30300b1a217077364e1b5d84df5fd72967e7edc0497419b3db",
      "vout": 1,
      "scriptSig": {
        "asm": "3045022100b6db6e71652d2dcaa818c24d7dcba0ddca9a9a09f45a5a8b175784dde494d78602204e4b1042564da546b032f09eb02d2211f9e8fa3aeb3c987a28962a0a7a6d312b[ALL] 037a380cf3628417c275e9010eea2d7b2a05337d38af25054675e3441a43aa4565",
        "hex": "483045022100b6db6e71652d2dcaa818c24d7dcba0ddca9a9a09f45a5a8b175784dde494d78602204e4b1042564da546b032f09eb02d2211f9e8fa3aeb3c987a28962a0a7a6d312b0121037a380cf3628417c275e9010eea2d7b2a05337d38af25054675e3441a43aa4565"
      },
      "sequence": 4294967295
    }
  ],
  "vout": [
    {
      "value": 0.00900000,
      "n": 0,
      "scriptPubKey": {
        "asm": "1 ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 02323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd3 3 OP_CHECKMULTISIG",
        "hex": "514c78ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff4c78ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff2102323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd353ae",
        "type": "nonstandard"
      }
    }
  ]
}

decodescript 514c78ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff4c78ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff2102323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd353ae

{
  "asm": "1 ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 02323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd3 3 OP_CHECKMULTISIG",
  "type": "nonstandard",
  "p2sh": "3Pr9qaUxaHFZbbdojAZFozH34dEqjpe4dU"
}

but decoding it manually we have:

51  OP_1
4c  Push data
78  Push 120 decimal  = 78 hex bytes
    ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
4c  Push data
78  Push 120 decimal  = 78 hex bytes
    ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
21  Push 33 dec = 21 hex: 
02323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd3
53  OP_3
ae  OP_CHECKMULTISIG

02323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd3 translates to: 1AqLAdfMzfVpdCAtk4rMCUCK6vvNUkGBdm

It seems like core does not see the 33 byte compressed key as valid, or is it not recognizing 0x21? opcode (quick search of 0x21 in script.h comes up empty)

What's the problem here? 0x21 isn't an OP code, its a size identifier. Are you suggesting that it is supposed to interpret your bare multisig (non standard BTW) as just a normal p2pkh address? Because it doesn't and it won't, it will assume that the data you are pushing are blobs of data (not any sort of key, that comes later). Because this is some script, it will interpret the address as a p2sh address.

Well the script appears to be valid (and it isn't mine btw) so I thought core should be able to parse it. It does specify 1 of 3 multisig, and it does provide 3 keys (albeit in a non-standard way). Maybe 0x21 is not the problem here, but the script is not decoded.

Core is able to parse the script. What exactly is the issue here?

On 9/21/2016 12:00 AM, Albert wrote:

Well the script appears to be valid (and it isn't mine btw) so I thought core should be able to parse it. It does specify 1 of 3 multisig, and it does provide 3 keys (albeit in a non-standard way)

— You are receiving this because you commented. Reply to this email directly, view it on GitHub #8770 (comment), or mute the thread https://github.com/notifications/unsubscribe-auth/ADm2gjCYgcWIMRqf2j1it6-Cp0NavqyLks5qsKvBgaJpZM4KCRZV.

it is not showing the addresses that are eligible signatures

Addresses are only shown for standard multisig scripts. That is not a standard multisig script since it does not consist of only valid public keys which are either 33 bytes (for compressed) or 65 bytes (for uncompressed).

As an additional reference point, btcd produces the same output, for the same reason:

$ btcctl decodescript 514c78ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff4c78ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff2102323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd353ae
{
  "asm": "1 ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 02323c909b017748294c1d1fb82648b2c2905cd941d9a863e036b3157e8aa85dd3 3 OP_CHECKMULTISIG",
  "type": "nonstandard",
  "p2sh": "3Pr9qaUxaHFZbbdojAZFozH34dEqjpe4dU"
}

Closing as "works as intended", could be improved in the documentation I suppose.