End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
OpenSSL::PKey::PKey#private_to_der
pkey.private_to_der → string
pkey.private_to_der(cipher, password) → string
ext/openssl/ossl_pkey.c
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static VALUE
ossl_pkey_private_to_der(int argc, VALUE *argv, VALUE self)
{
return do_pkcs8_export(argc, argv, self, 1);
}
Serializes the private key to DER-encoded PKCS #8 format. If called without arguments, unencrypted PKCS #8 PrivateKeyInfo format is used. If called with a cipher name and a password, PKCS #8 EncryptedPrivateKeyInfo format with PBES2 encryption scheme is used.