Make P256._rip7212 result check stricter

[Amxx]

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• contracts/utils/cryptography/P256.sol

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Walkthrough

Updated the _rip7212 assembly return-value evaluation in the P256.sol contract following a staticcall operation. The modification adds validation to ensure the returned data size matches the expected length of exactly one word (32 bytes, or 0x20 in hexadecimal) before extracting and validating the result. The function now confirms both that the returned data size is 0x20 and that the value at the scratch memory location equals 1 before setting isValid to true, replacing the previous logic that directly evaluated the memory value without size verification.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No description was provided by the author, making it impossible to assess relevance to the changeset.	Add a pull request description explaining the motivation for the stricter validation and any security implications of the change.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: making the P256._rip7212 result check stricter by adding proper return data length and value validation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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