Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage...

Vulnerability Description

Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey(). There is a clear correlation between execution time and private key length, which may cause disclosure of the length information of the private key. This might allow attackers to conduct timing attacks. NOTE: this report is disputed by the vendor and multiple third parties. The execution-time differences are intentional. A user may make a choice of a longer key as a tradeoff between strength and performance. In making this choice, the amount of information leaked to an adversary is of infinitesimal value

References

• https://github.com/weidai11/cryptopp/issues/1080
• https://cryptopp.com
• https://github.com/weidai11/cryptopp/issues/1080#issuecomment-996492222