How to generate RSA PKCS5 keypair in Javascript?

Question

I need to create a set of RSA keys (public+private) on the client (javascript), send it to the server (Ruby) that uses those keys to encrypt data, which is sent to a mobile device which needs to decrypt using the same generated private key.

I started by implementing the server-side and encrypt using OpenSSL

public_key = OpenSSL::PKey::RSA.new(Base64.decode64(user_public_key))

encrypted_data = public_key.public_encrypt(data)

For decrypting the data on mobile, I had to use PKCS5 padding for the decryption to work, due to OpenSSL using this padding protocol.

Now I want to create the RSA keys on Javascript, but I fail to find a matching library that uses the same RSA PKCS5 protocol.

I found suggestions to use SubtleCrypto but this uses OAEP rather than PKCS5.

Can anyone please suggest which library I can use with JavaScript in order to create a set of RSA keys that match the encryption protocol used by ruby's OpenSSL and the mobile libraries?