iOS Question RSA Encryption

Have you tried this: https://www.b4x.com/android/forum/threads/irsa-rsa-encryption-decryption.83477/#content

Yes, i did. It's no poblem to use it in b4i with encrypt and decrypt, but it seems not to be possible to encyrpt it in b4j and decrypt it in b4i. As Alexander wrote in

https://www.b4x.com/android/forum/threads/b4x-rsa-encrypt-and-decrypt.104065/#content

should this be the way, which does not work. I wasn't sure if a solution had been found in the meantime...