Add legacy EIP-1271 support (i.e. 'isValidSignature(bytes,bytes)') #29
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sidnym-ladrut
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Early versions of EIP-1271 called for a validation function with signature
isValidSignature(bytes,bytes) => (bytes4). Notably, this is the only version of the signature standard supported by by SAFE v1.*.*.In order to enable support for SAFE v1.*.* contracts (and any other legacy EIP-1271 targets), these changes add the
isValidSignature(bytes,bytes) => (bytes4)signature as an overloaded alternative to the modernisValidSignature(bytes32,bytes) => (bytes4)signature.