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sysverify 

        # OpenSSL::PKey::DSA.sysverify

(from ruby core)
### Implementation from DSA
---
    dsa.sysverify(digest, sig) -> true | false

---

Verifies whether the signature is valid given the message digest input.
It does so by validating `sig` using the public key of this DSA
instance.

**Deprecated in version 3.0**. Consider using PKey::PKey#sign_raw and
PKey::PKey#verify_raw instead.

`digest`
:   A message digest of the original input data to be signed.
`sig`
:   A DSA signature value.

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