Clarify ECDSA verification in RIP 7212#62
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The `x` coordinate of `R` may be greater than `n`. The current specification of RIP-7212 compares the `x` coordinate with the signature `r` value directly (as integers, presumably), which may return `false` when the standard result should be `true` This happens with negligible probability for honest signatures, but a malicious signature can be constructed which triggers this case. Disagreement could cause differing behavior on various EVM chains. Similarly, it is not specified what should happen when the recovered `R'` is the point at infinity. Most implementations will likely fail (correctly) but some may incorrectly treat `R'.x` as `0`.
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The
xcoordinate ofRmay be greater thann.The current specification of RIP-7212 compares the
xcoordinate with the signaturervalue directly (as integers, presumably), which may returnfalsewhen the standard result should betrueThis happens with negligible probability for honest signatures, but a malicious signature can be constructed which triggers this case. Disagreement could cause differing behavior on various EVM chains.
Similarly, it is not specified what should happen when the recovered
R'is the point at infinity. Most implementations will likely fail (correctly) but some may incorrectly treatR'.xas0.