# frozen_string_literal: true
require_relative 'utils'

if defined?(OpenSSL) && defined?(OpenSSL::PKey::DSA)

class OpenSSL::TestPKeyDSA < OpenSSL::PKeyTestCase
  def setup
    # May not be available in FIPS mode as DSA has been deprecated in FIPS 186-5
    omit_on_fips
  end

  def test_private
    key = Fixtures.pkey("dsa2048")
    assert_equal true, key.private?
    key2 = OpenSSL::PKey::DSA.new(key.to_der)
    assert_equal true, key2.private?
    key3 = key.public_key
    assert_equal false, key3.private?
    key4 = OpenSSL::PKey::DSA.new(key3.to_der)
    assert_equal false, key4.private?
  end

  def test_new
    key = OpenSSL::PKey::DSA.new(2048)
    pem  = key.public_key.to_pem
    OpenSSL::PKey::DSA.new pem
  end

  def test_new_break
    assert_nil(OpenSSL::PKey::DSA.new(2048) { break })
    assert_raise(RuntimeError) do
      OpenSSL::PKey::DSA.new(2048) { raise }
    end
  end

  def test_new_empty
    # pkeys are immutable with OpenSSL >= 3.0
    if openssl?(3, 0, 0)
      assert_raise(ArgumentError) { OpenSSL::PKey::DSA.new }
    else
      key = OpenSSL::PKey::DSA.new
      assert_nil(key.p)
      assert_raise(OpenSSL::PKey::PKeyError) { key.to_der }
    end
  end

  def test_generate
    # DSA.generate used to call DSA_generate_parameters_ex(), which adjusts the
    # size of q according to the size of p
    key1024 = OpenSSL::PKey::DSA.generate(1024)
    assert_predicate key1024, :private?
    assert_equal 1024, key1024.p.num_bits
    assert_equal 160, key1024.q.num_bits

    if ENV["OSSL_TEST_ALL"] == "1" # slow
      key2048 = OpenSSL::PKey::DSA.generate(2048)
      assert_equal 2048, key2048.p.num_bits
      assert_equal 256, key2048.q.num_bits

      key3072 = OpenSSL::PKey::DSA.generate(3072)
      assert_equal 3072, key3072.p.num_bits
      assert_equal 256, key3072.q.num_bits
    end
  end

  def test_sign_verify
    # The DSA valid size is 2048 or 3072 on FIPS.
    # https://github.com/openssl/openssl/blob/7649b5548e5c0352b91d9d3ed695e42a2ac1e99c/providers/common/securitycheck.c#L185-L188
    dsa = Fixtures.pkey("dsa2048")
    data = "Sign me!"
    if defined?(OpenSSL::Digest::DSS1)
      signature = dsa.sign(OpenSSL::Digest.new('DSS1'), data)
      assert_equal true, dsa.verify(OpenSSL::Digest.new('DSS1'), signature, data)
    end

    signature = dsa.sign("SHA256", data)
    assert_equal true, dsa.verify("SHA256", signature, data)

    signature0 = (<<~'end;').unpack1("m")
      MD4CHQC0zmRkVOAHJTm28fS5PVUv+4LtBeNaKqr/yfmVAh0AsTcLqofWHoW8X5oWu8AOvngOcFVZ
      cLTvhY3XNw==
    end;
    assert_equal true, dsa.verify("SHA256", signature0, data)
    signature1 = signature0.succ
    assert_equal false, dsa.verify("SHA256", signature1, data)
  end

  def test_sign_verify_raw
    key = Fixtures.pkey("dsa2048")
    data = 'Sign me!'
    digest = OpenSSL::Digest.digest('SHA1', data)

    invalid_sig = key.sign_raw(nil, digest.succ)
    malformed_sig = "*" * invalid_sig.bytesize

    # Sign by #syssign
    sig = key.syssign(digest)
    assert_equal true, key.sysverify(digest, sig)
    assert_equal false, key.sysverify(digest, invalid_sig)
    assert_sign_verify_false_or_error { key.sysverify(digest, malformed_sig) }
    assert_equal true, key.verify_raw(nil, sig, digest)
    assert_equal false, key.verify_raw(nil, invalid_sig, digest)
    assert_sign_verify_false_or_error { key.verify_raw(nil, malformed_sig, digest) }

    # Sign by #sign_raw
    sig = key.sign_raw(nil, digest)
    assert_equal true, key.sysverify(digest, sig)
    assert_equal false, key.sysverify(digest, invalid_sig)
    assert_sign_verify_false_or_error { key.sysverify(digest, malformed_sig) }
    assert_equal true, key.verify_raw(nil, sig, digest)
    assert_equal false, key.verify_raw(nil, invalid_sig, digest)
    assert_sign_verify_false_or_error { key.verify_raw(nil, malformed_sig, digest) }
  end

  def test_DSAPrivateKey
    # OpenSSL DSAPrivateKey format; similar to RSAPrivateKey
    orig = Fixtures.pkey("dsa2048")
    asn1 = OpenSSL::ASN1::Sequence([
      OpenSSL::ASN1::Integer(0),
      OpenSSL::ASN1::Integer(orig.p),
      OpenSSL::ASN1::Integer(orig.q),
      OpenSSL::ASN1::Integer(orig.g),
      OpenSSL::ASN1::Integer(orig.pub_key),
      OpenSSL::ASN1::Integer(orig.priv_key)
    ])
    key = OpenSSL::PKey::DSA.new(asn1.to_der)
    assert_predicate key, :private?
    assert_same_dsa orig, key

    pem = der_to_pem(asn1.to_der, "DSA PRIVATE KEY")
    key = OpenSSL::PKey::DSA.new(pem)
    assert_same_dsa orig, key

    assert_equal asn1.to_der, orig.to_der
    assert_equal pem, orig.export
  end

  def test_DSAPrivateKey_encrypted
    # OpenSSL DSAPrivateKey with OpenSSL encryption
    orig = Fixtures.pkey("dsa2048")

    pem = der_to_encrypted_pem(orig.to_der, "DSA PRIVATE KEY", "abcdef")
    key = OpenSSL::PKey::DSA.new(pem, "abcdef")
    assert_same_dsa orig, key
    key = OpenSSL::PKey::DSA.new(pem) { "abcdef" }
    assert_same_dsa orig, key

    cipher = OpenSSL::Cipher.new("aes-128-cbc")
    exported = orig.to_pem(cipher, "abcdef\0\1")
    assert_same_dsa orig, OpenSSL::PKey::DSA.new(exported, "abcdef\0\1")
    assert_raise(OpenSSL::PKey::PKeyError) {
      OpenSSL::PKey::DSA.new(exported, "abcdef")
    }
  end

  def test_PUBKEY
    orig = Fixtures.pkey("dsa2048")
    pub = OpenSSL::PKey::DSA.new(orig.public_to_der)

    asn1 = OpenSSL::ASN1::Sequence([
      OpenSSL::ASN1::Sequence([
        OpenSSL::ASN1::ObjectId("DSA"),
        OpenSSL::ASN1::Sequence([
          OpenSSL::ASN1::Integer(orig.p),
          OpenSSL::ASN1::Integer(orig.q),
          OpenSSL::ASN1::Integer(orig.g)
        ])
      ]),
      OpenSSL::ASN1::BitString(
        OpenSSL::ASN1::Integer(orig.pub_key).to_der
      )
    ])
    key = OpenSSL::PKey::DSA.new(asn1.to_der)
    assert_not_predicate key, :private?
    assert_same_dsa pub, key

    pem = der_to_pem(asn1.to_der, "PUBLIC KEY")
    key = OpenSSL::PKey::DSA.new(pem)
    assert_same_dsa pub, key

    assert_equal asn1.to_der, key.to_der
    assert_equal pem, key.export

    assert_equal asn1.to_der, orig.public_to_der
    assert_equal asn1.to_der, key.public_to_der
    assert_equal pem, orig.public_to_pem
    assert_equal pem, key.public_to_pem
  end

  def test_read_DSAPublicKey_pem
    # TODO: where is the standard? PKey::DSA.new can read only PEM
    p = 12260055936871293565827712385212529106400444521449663325576634579961635627321079536132296996623400607469624537382977152381984332395192110731059176842635699
    q = 979494906553787301107832405790107343409973851677
    g = 3731695366899846297271147240305742456317979984190506040697507048095553842519347835107669437969086119948785140453492839427038591924536131566350847469993845
    y = 10505239074982761504240823422422813362721498896040719759460296306305851824586095328615844661273887569281276387605297130014564808567159023649684010036304695
    pem = <<-EOF
-----BEGIN DSA PUBLIC KEY-----
MIHfAkEAyJSJ+g+P/knVcgDwwTzC7Pwg/pWs2EMd/r+lYlXhNfzg0biuXRul8VR4
VUC/phySExY0PdcqItkR/xYAYNMbNwJBAOoV57X0FxKO/PrNa/MkoWzkCKV/hzhE
p0zbFdsicw+hIjJ7S6Sd/FlDlo89HQZ2FuvWJ6wGLM1j00r39+F2qbMCFQCrkhIX
SG+is37hz1IaBeEudjB2HQJAR0AloavBvtsng8obsjLb7EKnB+pSeHr/BdIQ3VH7
fWLOqqkzFeRrYMDzUpl36XktY6Yq8EJYlW9pCMmBVNy/dQ==
-----END DSA PUBLIC KEY-----
    EOF
    key = OpenSSL::PKey::DSA.new(pem)
    assert(key.public?)
    assert(!key.private?)
    assert_equal(p, key.p)
    assert_equal(q, key.q)
    assert_equal(g, key.g)
    assert_equal(y, key.pub_key)
    assert_equal(nil, key.priv_key)
  end

  def test_params
    key = Fixtures.pkey("dsa2048")
    assert_kind_of(OpenSSL::BN, key.p)
    assert_equal(key.p, key.params["p"])
    assert_kind_of(OpenSSL::BN, key.q)
    assert_equal(key.q, key.params["q"])
    assert_kind_of(OpenSSL::BN, key.g)
    assert_equal(key.g, key.params["g"])
    assert_kind_of(OpenSSL::BN, key.pub_key)
    assert_equal(key.pub_key, key.params["pub_key"])
    assert_kind_of(OpenSSL::BN, key.priv_key)
    assert_equal(key.priv_key, key.params["priv_key"])

    pubkey = OpenSSL::PKey.read(key.public_to_der)
    assert_equal(key.params["p"], pubkey.params["p"])
    assert_equal(key.pub_key, pubkey.pub_key)
    assert_equal(key.pub_key, pubkey.params["pub_key"])
    assert_nil(pubkey.priv_key)
    assert_nil(pubkey.params["priv_key"])
  end

  def test_dup
    key = Fixtures.pkey("dsa2048")
    key2 = key.dup
    assert_equal key.params, key2.params

    # PKey is immutable in OpenSSL >= 3.0
    if !openssl?(3, 0, 0)
      key2.set_pqg(key2.p + 1, key2.q, key2.g)
      assert_not_equal key.params, key2.params
    end
  end

  def test_marshal
    key = Fixtures.pkey("dsa2048")
    deserialized = Marshal.load(Marshal.dump(key))

    assert_equal key.to_der, deserialized.to_der
  end

  private
  def assert_same_dsa(expected, key)
    check_component(expected, key, [:p, :q, :g, :pub_key, :priv_key])
  end
end

end
