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Add warning about low public key exponent #5234

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merged 3 commits into from
Oct 1, 2024
Merged

Add warning about low public key exponent #5234

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c9243c4
Add warning about public key exponent
Amxx Oct 1, 2024
316b6f0
Update contracts/utils/cryptography/RSA.sol
ernestognw Oct 1, 2024
7d49ed4
Update contracts/utils/cryptography/RSA.sol
Amxx Oct 1, 2024
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8 changes: 6 additions & 2 deletions contracts/utils/cryptography/RSA.sol
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Expand Up @@ -36,8 +36,12 @@ library RSA {
* 2048 bits. If you use a smaller key, consider replacing it with a larger, more secure, one.
*
* WARNING: This verification algorithm doesn't prevent replayability. If called multiple times with the same
* digest, public key and (valid signature), it will return true every time. Consider including an onchain nonce or
* unique identifier in the message to prevent replay attacks.
* digest, public key and (valid signature), it will return true every time. Consider including an onchain nonce
* or unique identifier in the message to prevent replay attacks.
*
* WARNING: This verification algorithm supports any exponent. NIST recommends using `65537` (or higher).
* That is the default value many libraries use, such as OpenSSL. Developers may choose to reject public keys
* using a low exponent out of security concerns.
*
* @param digest the digest to verify
* @param s is a buffer containing the signature
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