# frozen_string_literal: true
require_relative 'utils'

if defined?(OpenSSL)

class OpenSSL::TestDigest < OpenSSL::TestCase
  def setup
    super
    @d1 = OpenSSL::Digest.new("SHA256")
    @d2 = OpenSSL::Digest::SHA256.new
  end

  def test_initialize
    assert_raise(OpenSSL::Digest::DigestError) {
      OpenSSL::Digest.new("no such algorithm")
    }
  end

  def test_digest
    # SHA256 null value calculated by `echo -n "" | sha256sum`
    null_hex = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    null_bin = [null_hex].pack("H*")
    data = "DATA"
    # SHA256 DATA value calculated by `echo -n "DATA" | sha256sum`
    hex = "c97c29c7a71b392b437ee03fd17f09bb10b75e879466fc0eb757b2c4a78ac938"
    bin = [hex].pack("H*")
    assert_equal(null_bin, @d1.digest)
    assert_equal(null_hex, @d1.hexdigest)
    @d1 << data
    assert_equal(bin, @d1.digest)
    assert_equal(hex, @d1.hexdigest)
    assert_equal(bin, OpenSSL::Digest.digest('SHA256', data))
    assert_equal(hex, OpenSSL::Digest.hexdigest('SHA256', data))
  end

  def test_eql
    assert(@d1 == @d2, "==")
    d = @d1.clone
    assert(d == @d1, "clone")
  end

  def test_info
    assert_equal("SHA256", @d1.name, "name")
    assert_equal("SHA256", @d2.name, "name")
    assert_equal(32, @d1.size, "size")
  end

  def test_dup
    @d1.update("DATA")
    assert_equal(@d1.name, @d1.dup.name, "dup")
    assert_equal(@d1.name, @d1.clone.name, "clone")
    assert_equal(@d1.digest, @d1.clone.digest, "clone .digest")
  end

  def test_reset
    @d1.update("DATA")
    dig1 = @d1.digest
    @d1.reset
    @d1.update("DATA")
    dig2 = @d1.digest
    assert_equal(dig1, dig2, "reset")
  end

  def test_digest_constants
    non_fips_names = %w{MD5}
    names = %w{SHA1 SHA224 SHA256 SHA384 SHA512}
    names = non_fips_names + names unless OpenSSL.fips_mode
    names.each do |name|
      assert_not_nil(OpenSSL::Digest.new(name))
      klass = OpenSSL::Digest.const_get(name.tr('-', '_'))
      assert_not_nil(klass.new)
    end
  end

  def test_digest_by_oid_and_name
    # SHA256
    o1 = OpenSSL::Digest.digest("SHA256", "")
    o2 = OpenSSL::Digest.digest("sha256", "")
    assert_equal(o1, o2)
    o3 = OpenSSL::Digest.digest("2.16.840.1.101.3.4.2.1", "")
    assert_equal(o1, o3)

    # An alias for SHA256 recognized by EVP_get_digestbyname(), but not by
    # EVP_MD_fetch()
    o4 = OpenSSL::Digest.digest("RSA-SHA256", "")
    assert_equal(o1, o4)
  end

  def encode16(str)
    str.unpack1("H*")
  end

  def test_sha2
    sha224_a = "abd37534c7d9a2efb9465de931cd7055ffdb8879563ae98078d6d6d5"
    sha256_a = "ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb"
    sha384_a = "54a59b9f22b0b80880d8427e548b7c23abd873486e1f035dce9cd697e85175033caa88e6d57bc35efae0b5afd3145f31"
    sha512_a = "1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75"

    assert_equal(sha224_a, OpenSSL::Digest.hexdigest('SHA224', "a"))
    assert_equal(sha256_a, OpenSSL::Digest.hexdigest('SHA256', "a"))
    assert_equal(sha384_a, OpenSSL::Digest.hexdigest('SHA384', "a"))
    assert_equal(sha512_a, OpenSSL::Digest.hexdigest('SHA512', "a"))

    assert_equal(sha224_a, encode16(OpenSSL::Digest.digest('SHA224', "a")))
    assert_equal(sha256_a, encode16(OpenSSL::Digest.digest('SHA256', "a")))
    assert_equal(sha384_a, encode16(OpenSSL::Digest.digest('SHA384', "a")))
    assert_equal(sha512_a, encode16(OpenSSL::Digest.digest('SHA512', "a")))
  end

  def test_sha512_truncate
    sha512_224_a = "d5cdb9ccc769a5121d4175f2bfdd13d6310e0d3d361ea75d82108327"
    sha512_256_a = "455e518824bc0601f9fb858ff5c37d417d67c2f8e0df2babe4808858aea830f8"

    assert_equal(sha512_224_a, OpenSSL::Digest.hexdigest('SHA512-224', "a"))
    assert_equal(sha512_256_a, OpenSSL::Digest.hexdigest('SHA512-256', "a"))

    assert_equal(sha512_224_a, encode16(OpenSSL::Digest.digest('SHA512-224', "a")))
    assert_equal(sha512_256_a, encode16(OpenSSL::Digest.digest('SHA512-256', "a")))
  end

  def test_sha3
    s224 = '6b4e03423667dbb73b6e15454f0eb1abd4597f9a1b078e3f5b5a6bc7'
    s256 = 'a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a'
    s384 = '0c63a75b845e4f7d01107d852e4c2485c51a50aaaa94fc61995e71bbee983a2ac3713831264adb47fb6bd1e058d5f004'
    s512 = 'a69f73cca23a9ac5c8b567dc185a756e97c982164fe25859e0d1dcc1475c80a615b2123af1f5f94c11e3e9402c3ac558f500199d95b6d3e301758586281dcd26'
    assert_equal(s224, OpenSSL::Digest.hexdigest('SHA3-224', ""))
    assert_equal(s256, OpenSSL::Digest.hexdigest('SHA3-256', ""))
    assert_equal(s384, OpenSSL::Digest.hexdigest('SHA3-384', ""))
    assert_equal(s512, OpenSSL::Digest.hexdigest('SHA3-512', ""))
  end

  def test_fetched_evp_md
    # KECCAK-256 is not FIPS-approved.
    omit_on_fips

    # Pre-NIST Keccak is an example of a digest algorithm that doesn't have an
    # NID and requires dynamic allocation of EVP_MD
    hex = "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"
    assert_equal(hex, OpenSSL::Digest.hexdigest("KECCAK-256", ""))
  end if openssl?(3, 2, 0)

  def test_openssl_digest
    assert_equal OpenSSL::Digest::MD5, OpenSSL::Digest("MD5")

    assert_raise NameError do
      OpenSSL::Digest("no such digest")
    end
  end

  def test_digests
    digests = OpenSSL::Digest.digests
    assert_kind_of Array, digests
    assert_include digests, "md5"
    assert_include digests, "sha1"
    assert_include digests, "sha256"
    assert_include digests, "sha512"
  end
end

end
