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Merge bitcoin/bitcoin#28336: rpc: parse legacy pubkeys consistently with specific error messages

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98570fe29b test: add coverage for parsing cryptographically invalid pubkeys (Sebastian Falbesoner)
c740b154d1 rpc: use `HexToPubKey` helper for all legacy pubkey-parsing RPCs (Sebastian Falbesoner)
100e8a75bf rpc: check and throw specific pubkey parsing errors in `HexToPubKey` (Sebastian Falbesoner)

Pull request description:

  Parsing legacy public keys can fail for three reasons (in this order):
  - pubkey is not in hex
  - pubkey has an invalid length (not 33 or 65 bytes for compressed/uncompressed, respectively)
  - pubkey is crytographically invalid, i.e. is not on curve (`CPubKey.IsFullyValid()` check)

  Many RPCs currently perform these checks manually with different error messages, even though we already have a `HexToPubKey` helper. This PR puts all three checks in this helper (the length check was done on the call-sites before), adds specific error messages for each case, and consequently uses it for all RPCs that parse legacy pubkeys. This leads to deduplicated code and also to more consistent and detailed error messages for the user.

  Affected RPC calls are `createmultisig`, `addmultisigaddress`, `importpubkey`, `importmulti`, `fundrawtransaction`, `walletcreatefundedpsbt`, `send` and `sendall`.

  Note that the error code (-5 a.k.a. `RPC_INVALID_ADDRESS_OR_KEY`) doesn't change in any of the causes, so the changes are not breaking RPC API compatibility. Only the messages are more specific.

  The last commits adds test coverage for the cryptographically invalid (not-on-curve) pubkey case which wasn't exercised before.

ACKs for top commit:
  stratospher:
    tested ACK 98570fe.
  davidgumberg:
    ACK 98570fe29b
  Eunovo:
    Tested ACK 98570fe29b
  achow101:
    ACK 98570fe29b

Tree-SHA512: cfa474176e95b5b18f3a9da28fdd9e87195cd58994c1331198f2840925fff322fd323a6371feab74a1b32e4b9ea58a6dc732fa751b4cdd45402c1029af609ece
This commit is contained in:
Ava Chow
2024-05-08 17:52:58 -04:00
parent 43a66c55ec 98570fe29b
commit 4ff42762fd
7 changed files with 19 additions and 38 deletions
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9
test/functional/wallet_basic.py
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@@ -461,10 +461,13 @@ class WalletTest(BitcoinTestFramework):
assert_raises_rpc_error(-5, "Invalid Bitcoin address or script", self.nodes[0].importaddress, "invalid")
# This will raise an exception for attempting to import a pubkey that isn't in hex
assert_raises_rpc_error(-5, "Pubkey must be a hex string", self.nodes[0].importpubkey, "not hex")
assert_raises_rpc_error(-5, 'Pubkey "not hex" must be a hex string', self.nodes[0].importpubkey, "not hex")
# This will raise an exception for importing an invalid pubkey
assert_raises_rpc_error(-5, "Pubkey is not a valid public key", self.nodes[0].importpubkey, "5361746f736869204e616b616d6f746f")
# This will raise exceptions for importing a pubkeys with invalid length / invalid coordinates
too_short_pubkey = "5361746f736869204e616b616d6f746f"
assert_raises_rpc_error(-5, f'Pubkey "{too_short_pubkey}" must have a length of either 33 or 65 bytes', self.nodes[0].importpubkey, too_short_pubkey)
not_on_curve_pubkey = bytes([4] + [0]*64).hex() # pubkey with coordinates (0,0) is not on curve
assert_raises_rpc_error(-5, f'Pubkey "{not_on_curve_pubkey}" must be cryptographically valid', self.nodes[0].importpubkey, not_on_curve_pubkey)
# Bech32m addresses cannot be imported into a legacy wallet
assert_raises_rpc_error(-5, "Bech32m addresses cannot be imported into legacy wallets", self.nodes[0].importaddress, "bcrt1p0xlxvlhemja6c4dqv22uapctqupfhlxm9h8z3k2e72q4k9hcz7vqc8gma6")