syssign

        # OpenSSL::PKey::DSA.syssign

(from ruby core)
### Implementation from DSA
---
    dsa.syssign(string) -> string

---

Computes and returns the DSA signature of `string`, where `string` is
expected to be an already-computed message digest of the original input
data. The signature is issued using the private key of this DSA
instance.

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

`string`
:   A message digest of the original input data to be signed.


Example:
    dsa = OpenSSL::PKey::DSA.new(2048)
    doc = "Sign me"
    digest = OpenSSL::Digest.digest('SHA1', doc)

    # With legacy #syssign and #sysverify:
    sig = dsa.syssign(digest)
    p dsa.sysverify(digest, sig) #=> true

    # With #sign_raw and #verify_raw:
    sig = dsa.sign_raw(nil, digest)
    p dsa.verify_raw(nil, sig, digest) #=> true