fix: Fix malleable signature (SC-5066) #26
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This pull request has been linked to Shortcut Story #5066: [ERC20 audit] Prevent malleable signatures in Permit. |
lucas-manuel
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Added to Permit:
// Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}.
require(uint256(s) <= S_VALUE_INCLUSIVE_UPPER_BOUND && (v == 27 || v == 28), "ERC20:P:MALLEABLE");Addresses https://github.com/maple-labs/tob-audit-2022-03-07/issues/5