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Merge #20405: p2p: avoid calculating onion address checksum when version is not 3

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d355a302d9 Break circuit earlier (lontivero)

Pull request description:

  Currently when parsing an onion v3 address the pubic key checksum is calculated in order to compare it with the received address checksum. However this step is not necessary if the address version byte is not 3, in which case the method can return with false immediately.

ACKs for top commit:
  jonatack:
    ACK d355a302d9
  practicalswift:
    ACK d355a302d9 -- patch looks correct
  hebasto:
    ACK d355a302d9, I have reviewed the code and it looks OK, I agree it can be merged.
  sipa:
    utACK d355a302d9

Tree-SHA512: 9e4506793b7f4a62ce8edc41a260a8c125ae81ed2f90cd850eb2a9214d323c446edc7586c7b0590dcbf3aed5be534718b77bb19c45b48f8f52553d32a3663a65
This commit is contained in:
fanquake 2020-11-17 13:56:11 +08:00
commit 7c0d412a74
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1 changed files with 5 additions and 1 deletions
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6
src/netaddress.cpp
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@ -255,10 +255,14 @@ bool CNetAddr::SetSpecial(const std::string& str)
Span<const uint8_t> input_checksum{input.data() + ADDR_TORV3_SIZE, torv3::CHECKSUM_LEN};
Span<const uint8_t> input_version{input.data() + ADDR_TORV3_SIZE + torv3::CHECKSUM_LEN, sizeof(torv3::VERSION)};
if (input_version != torv3::VERSION) {
return false;
}
uint8_t calculated_checksum[torv3::CHECKSUM_LEN];
torv3::Checksum(input_pubkey, calculated_checksum);
if (input_checksum != calculated_checksum || input_version != torv3::VERSION) {
if (input_checksum != calculated_checksum) {
return false;
}