crypto.webkitSubtle.encrypt isn't working

Hello! I'm making browser's extensions for every browser. I use webcrypto for chrome and mozilla and it works perfect, but the same code (i replace crypto.subtle to crypto.webkitSubtle) isn't work correctly with Safari. I use RSA-OAEP with Sha-512 hash.
It's correctly generate keys and export them to jwk, but i can't encrypt or decrypt anything with this keys. It is even don't show error just do nothing.
Can you help pls, how use this in Safari?

Thanks in advance.