verify_pss

        # OpenSSL::PKey::RSA.verify_pss

(from ruby core)
### Implementation from RSA
---
    rsa.verify_pss(digest, signature, data, salt_length:, mgf1_hash:) -> true | false

---

Verifies *data* using the Probabilistic Signature Scheme (RSA-PSS).

The return value is `true` if the signature is valid, `false` otherwise.
RSAError will be raised if an error occurs.

See #sign_pss for the signing operation and an example code.

### Parameters
*digest*
:   A String containing the message digest algorithm name.
*data*
:   A String. The data to be signed.
*salt_length*
:   The length in octets of the salt. Two special values are reserved:
    `:digest` means the digest length, and `:auto` means automatically
    determining the length based on the signature.
*mgf1_hash*
:   The hash algorithm used in MGF1.