fuzz: introduce and use ConsumePrivateKey helper
#28419
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maflcko
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Sep 6, 2023
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brunoerg
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Sep 7, 2023
Frank-GER
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Sep 8, 2023
583af18 fuzz: introduce and use `ConsumePrivateKey` helper (Sebastian Falbesoner) Pull request description: In the course of reviewing BIP324 related PRs I noticed a frequent pattern of creating private keys (`CKey` instances) with data consumed from the fuzz data provider: ``` auto key_data = provider.ConsumeBytes<unsigned char>(32); key_data.resize(32); CKey key; key.Set(key_data.begin(), key_data.end(), /*fCompressedIn=*/true); ``` This PR introduces a corresponding helper `ConsumePrivateKey` in order to deduplicate code. The compressed flag can either be set to a fixed value, or, if `std::nullopt` is passed (=default), is also consumed from the fuzz data provider via `.ConsumeBool()`. Note that this is not a pure refactor, as some of the replaced call-sites previously consumed a random length (`ConsumeRandomLengthByteVector`) instead of a fixed size of 32 bytes for key data. As far as I can see, there is not much value in using a random size, as in all those cases we can only proceed or do something useful with a valid private key, and key data with sizes other than 32 bytes always lead to invalid keys. ACKs for top commit: sipa: utACK 583af18 brunoerg: crACK 583af18 Tree-SHA512: 58a178432ba1eb0a2f7597b6700e96477e8b10f429ef642445a52db12e74d81aec307888315b772bfda9610f90df3e1d556cf024c2bef1d520303b12584feaaa
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In the course of reviewing BIP324 related PRs I noticed a frequent pattern of creating private keys (
CKeyinstances) with data consumed from the fuzz data provider:This PR introduces a corresponding helper
ConsumePrivateKeyin order to deduplicate code. The compressed flag can either be set to a fixed value, or, ifstd::nulloptis passed (=default), is also consumed from the fuzz data provider via.ConsumeBool().Note that this is not a pure refactor, as some of the replaced call-sites previously consumed a random length (
ConsumeRandomLengthByteVector) instead of a fixed size of 32 bytes for key data. As far as I can see, there is not much value in using a random size, as in all those cases we can only proceed or do something useful with a valid private key, and key data with sizes other than 32 bytes always lead to invalid keys.