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instance method

OpenSSL::PKey::DH#compute_key

dh.compute_key(pub_bn) → string

ext/openssl/lib/openssl/pkey.rb View on GitHub ↗

# File tmp/rubies/ruby-3.2.0/ext/openssl/lib/openssl/pkey.rb, line 49
def compute_key(pub_bn)
  # FIXME: This is constructing an X.509 SubjectPublicKeyInfo and is very
  # inefficient
  obj = OpenSSL::ASN1.Sequence([
    OpenSSL::ASN1.Sequence([
      OpenSSL::ASN1.ObjectId("dhKeyAgreement"),
      OpenSSL::ASN1.Sequence([
        OpenSSL::ASN1.Integer(p),
        OpenSSL::ASN1.Integer(g),
      ]),
    ]),
    OpenSSL::ASN1.BitString(OpenSSL::ASN1.Integer(pub_bn).to_der),
  ])
  derive(OpenSSL::PKey.read(obj.to_der))
end

Returns a String containing a shared secret computed from the other party’s public value.

This method is provided for backwards compatibility, and calls derive internally.

Parameters

pub_bn is a OpenSSL::BN, not the DH instance returned by DH#public_key as that contains the DH parameters only.

See also .new #export .generate #generate_key! also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0

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