signature encoding error java openssl
https://stackoverflow.com/questions/56017754/openssl-always-fails-verifying-signature-generated-from-bouncy-castle-in-java
https://stackoverflow.com/questions/34093006/rsa-java-signature-verification-failed
https://forums.oracle.com/ords/apexds/post/signing-with-openssl-verify-with-java-fails-3922
https://habr.com/ru/company/swordfish_security/blog/661093/
Time attack
https://www.opennet.ru/opennews/art.shtml?num=48780