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Make MultiSigner use compressed ECDSA public key
#4502
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bkchr
commented
Dec 27, 2019
primitives/runtime/src/lib.rs
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| MultiSigner::Sr25519(who) => <[u8; 32]>::from(who).into(), | ||
| MultiSigner::Ecdsa(who) => sp_io::hashing::blake2_256(who.as_ref()).into(), | ||
| MultiSigner::Ecdsa(who) => sp_io::hashing::blake2_256( | ||
| &who.as_compressed().expect("what should we do?")[..], |
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@gavofyork what should we do here? I think the best would be to propagate the error via IdentifyAccount.
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i believe this cannot fail for any valid keypair, so .expect should be fine
bkchr
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MultiSigner
bkchr
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MultiSigner MultiSigner use compressed ECDSA public key
gavofyork
approved these changes
Dec 30, 2019
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but... what's the point of supporting uncompressed public key format? |
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Good question, I just followed the initial implementation. However, I think that for ergonomic reasons the support for both sounds reasonable to me. If you say that people only use the compressed version, I can remove the support for full public keys. |
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it does leave this annoying |
bkchr
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Jan 17, 2020
Some fixes after: #4502 This removes the unwanted `expect`s from `MultiSigner`. Instead we convert from full to compressed in `TryFrom` and can return an error on invalid input.
gavofyork
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Jan 20, 2020
Some fixes after: #4502 This removes the unwanted `expect`s from `MultiSigner`. Instead we convert from full to compressed in `TryFrom` and can return an error on invalid input.
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MultiSignerdid not compressed the ECDSA public key before hashing it butMultiSignatureexpected that the public key is compressed when verifying a signature. Thus, the signature verification could never succeed.This pr changes the following:
MultiSignercompresses the public key before hashing it withblake256.Verify for ecdsa::Signaturecompresses given public key before comparing it.ecdsa::Publicis now an enum that distinguishes between the full and compressed format.Fixes: #4498