using System;

using NUnit.Framework;

using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;

namespace Org.BouncyCastle.Math.EC.Rfc8032.Tests
{
    [TestFixture]
    public class Ed25519Test
    {
		private static readonly SecureRandom Random = new SecureRandom();

        private static readonly byte[] Neutral = Hex.DecodeStrict("0100000000000000000000000000000000000000000000000000000000000000");

        [SetUp]
        public void SetUp()
        {
            Ed25519.Precompute();
        }

		[Test]
        public void TestEd25519Consistency()
        {
            byte[] sk = new byte[Ed25519.SecretKeySize];
            byte[] pk = new byte[Ed25519.PublicKeySize];
            byte[] m = new byte[255];
            byte[] sig1 = new byte[Ed25519.SignatureSize];
			byte[] sig2 = new byte[Ed25519.SignatureSize];

			Random.NextBytes(m);

            for (int i = 0; i < 10; ++i)
            {
				Random.NextBytes(sk);
                Ed25519.GeneratePublicKey(sk, 0, pk, 0);

                int mLen = Random.NextInt() & 255;

                Ed25519.Sign(sk, 0, m, 0, mLen, sig1, 0);
                Ed25519.Sign(sk, 0, pk, 0, m, 0, mLen, sig2, 0);

                Assert.IsTrue(Arrays.AreEqual(sig1, sig2), "Ed25519 consistent signatures #" + i);

                bool shouldVerify = Ed25519.Verify(sig1, 0, pk, 0, m, 0, mLen);

                Assert.IsTrue(shouldVerify, "Ed25519 consistent sign/verify #" + i);

                sig1[Ed25519.PublicKeySize - 1] ^= 0x80;
                bool shouldNotVerify = Ed25519.Verify(sig1, 0, pk, 0, m, 0, mLen);

                Assert.IsFalse(shouldNotVerify, "Ed25519 consistent verification failure #" + i);
            }
        }

        [Test]
        public void TestEd25519ctxConsistency()
        {
            byte[] sk = new byte[Ed25519.SecretKeySize];
            byte[] pk = new byte[Ed25519.PublicKeySize];
            byte[] ctx = new byte[Random.NextInt() & 7];
            byte[] m = new byte[255];
            byte[] sig1 = new byte[Ed25519.SignatureSize];
            byte[] sig2 = new byte[Ed25519.SignatureSize];

            Random.NextBytes(ctx);
            Random.NextBytes(m);

            for (int i = 0; i < 10; ++i)
            {
                Random.NextBytes(sk);
                Ed25519.GeneratePublicKey(sk, 0, pk, 0);

                int mLen = Random.NextInt() & 255;

                Ed25519.Sign(sk, 0, ctx, m, 0, mLen, sig1, 0);
                Ed25519.Sign(sk, 0, pk, 0, ctx, m, 0, mLen, sig2, 0);

                Assert.IsTrue(Arrays.AreEqual(sig1, sig2), "Ed25519ctx consistent signatures #" + i);

                bool shouldVerify = Ed25519.Verify(sig1, 0, pk, 0, ctx, m, 0, mLen);

                Assert.IsTrue(shouldVerify, "Ed25519ctx consistent sign/verify #" + i);

                sig1[Ed25519.PublicKeySize - 1] ^= 0x80;
                bool shouldNotVerify = Ed25519.Verify(sig1, 0, pk, 0, ctx, m, 0, mLen);

                Assert.IsFalse(shouldNotVerify, "Ed25519ctx consistent verification failure #" + i);
            }
        }

        [Test]
        public void TestEd25519phConsistency()
        {
            byte[] sk = new byte[Ed25519.SecretKeySize];
            byte[] pk = new byte[Ed25519.PublicKeySize];
            byte[] ctx = new byte[Random.NextInt() & 7];
            byte[] m = new byte[255];
            byte[] ph = new byte[Ed25519.PrehashSize];
            byte[] sig1 = new byte[Ed25519.SignatureSize];
            byte[] sig2 = new byte[Ed25519.SignatureSize];

            Random.NextBytes(ctx);
            Random.NextBytes(m);

            for (int i = 0; i < 10; ++i)
            {
                Random.NextBytes(sk);
                Ed25519.GeneratePublicKey(sk, 0, pk, 0);

                int mLen = Random.NextInt() & 255;

                IDigest prehash = Ed25519.CreatePrehash();
                prehash.BlockUpdate(m, 0, mLen);
                prehash.DoFinal(ph, 0);

                Ed25519.SignPrehash(sk, 0, ctx, ph, 0, sig1, 0);
                Ed25519.SignPrehash(sk, 0, pk, 0, ctx, ph, 0, sig2, 0);

                Assert.IsTrue(Arrays.AreEqual(sig1, sig2), "Ed25519ph consistent signatures #" + i);

                bool shouldVerify = Ed25519.VerifyPrehash(sig1, 0, pk, 0, ctx, ph, 0);

                Assert.IsTrue(shouldVerify, "Ed25519ph consistent sign/verify #" + i);

                sig1[Ed25519.PublicKeySize - 1] ^= 0x80;
                bool shouldNotVerify = Ed25519.VerifyPrehash(sig1, 0, pk, 0, ctx, ph, 0);

                Assert.IsFalse(shouldNotVerify, "Ed25519ph consistent verification failure #" + i);
            }
        }

        [Test]
		public void TestEd25519Vector1()
        {
            CheckEd25519Vector(
                ("9d61b19deffd5a60ba844af492ec2cc4"
                + "4449c5697b326919703bac031cae7f60"),
                ("d75a980182b10ab7d54bfed3c964073a"
                + "0ee172f3daa62325af021a68f707511a"),
                "",
                ("e5564300c360ac729086e2cc806e828a"
                + "84877f1eb8e5d974d873e06522490155"
                + "5fb8821590a33bacc61e39701cf9b46b"
                + "d25bf5f0595bbe24655141438e7a100b"),
                "Ed25519 Vector #1");
        }
      
		[Test]
        public void TestEd25519Vector2()
        {
            CheckEd25519Vector(
                ("4ccd089b28ff96da9db6c346ec114e0f"
                + "5b8a319f35aba624da8cf6ed4fb8a6fb"),
                ("3d4017c3e843895a92b70aa74d1b7ebc"
                + "9c982ccf2ec4968cc0cd55f12af4660c"),
                "72",
                ("92a009a9f0d4cab8720e820b5f642540"
                + "a2b27b5416503f8fb3762223ebdb69da"
                + "085ac1e43e15996e458f3613d0f11d8c"
                + "387b2eaeb4302aeeb00d291612bb0c00"),
                "Ed25519 Vector #2");
        }
      
		[Test]
        public void TestEd25519Vector3()
        {
            CheckEd25519Vector(
                ("c5aa8df43f9f837bedb7442f31dcb7b1"
                + "66d38535076f094b85ce3a2e0b4458f7"),
                ("fc51cd8e6218a1a38da47ed00230f058"
                + "0816ed13ba3303ac5deb911548908025"),
                "af82",
                ("6291d657deec24024827e69c3abe01a3"
                + "0ce548a284743a445e3680d7db5ac3ac"
                + "18ff9b538d16f290ae67f760984dc659"
                + "4a7c15e9716ed28dc027beceea1ec40a"),
                "Ed25519 Vector #3");
        }

        [Test]
        public void TestEd25519Vector1023()
        {
            string m =
                "08b8b2b733424243760fe426a4b54908" +
                "632110a66c2f6591eabd3345e3e4eb98" +
                "fa6e264bf09efe12ee50f8f54e9f77b1" +
                "e355f6c50544e23fb1433ddf73be84d8" +
                "79de7c0046dc4996d9e773f4bc9efe57" +
                "38829adb26c81b37c93a1b270b20329d" +
                "658675fc6ea534e0810a4432826bf58c" +
                "941efb65d57a338bbd2e26640f89ffbc" +
                "1a858efcb8550ee3a5e1998bd177e93a" +
                "7363c344fe6b199ee5d02e82d522c4fe" +
                "ba15452f80288a821a579116ec6dad2b" +
                "3b310da903401aa62100ab5d1a36553e" +
                "06203b33890cc9b832f79ef80560ccb9" +
                "a39ce767967ed628c6ad573cb116dbef" +
                "efd75499da96bd68a8a97b928a8bbc10" +
                "3b6621fcde2beca1231d206be6cd9ec7" +
                "aff6f6c94fcd7204ed3455c68c83f4a4" +
                "1da4af2b74ef5c53f1d8ac70bdcb7ed1" +
                "85ce81bd84359d44254d95629e9855a9" +
                "4a7c1958d1f8ada5d0532ed8a5aa3fb2" +
                "d17ba70eb6248e594e1a2297acbbb39d" +
                "502f1a8c6eb6f1ce22b3de1a1f40cc24" +
                "554119a831a9aad6079cad88425de6bd" +
                "e1a9187ebb6092cf67bf2b13fd65f270" +
                "88d78b7e883c8759d2c4f5c65adb7553" +
                "878ad575f9fad878e80a0c9ba63bcbcc" +
                "2732e69485bbc9c90bfbd62481d9089b" +
                "eccf80cfe2df16a2cf65bd92dd597b07" +
                "07e0917af48bbb75fed413d238f5555a" +
                "7a569d80c3414a8d0859dc65a46128ba" +
                "b27af87a71314f318c782b23ebfe808b" +
                "82b0ce26401d2e22f04d83d1255dc51a" +
                "ddd3b75a2b1ae0784504df543af8969b" +
                "e3ea7082ff7fc9888c144da2af58429e" +
                "c96031dbcad3dad9af0dcbaaaf268cb8" +
                "fcffead94f3c7ca495e056a9b47acdb7" +
                "51fb73e666c6c655ade8297297d07ad1" +
                "ba5e43f1bca32301651339e22904cc8c" +
                "42f58c30c04aafdb038dda0847dd988d" +
                "cda6f3bfd15c4b4c4525004aa06eeff8" +
                "ca61783aacec57fb3d1f92b0fe2fd1a8" +
                "5f6724517b65e614ad6808d6f6ee34df" +
                "f7310fdc82aebfd904b01e1dc54b2927" +
                "094b2db68d6f903b68401adebf5a7e08" +
                "d78ff4ef5d63653a65040cf9bfd4aca7" +
                "984a74d37145986780fc0b16ac451649" +
                "de6188a7dbdf191f64b5fc5e2ab47b57" +
                "f7f7276cd419c17a3ca8e1b939ae49e4" +
                "88acba6b965610b5480109c8b17b80e1" +
                "b7b750dfc7598d5d5011fd2dcc5600a3" +
                "2ef5b52a1ecc820e308aa342721aac09" +
                "43bf6686b64b2579376504ccc493d97e" +
                "6aed3fb0f9cd71a43dd497f01f17c0e2" +
                "cb3797aa2a2f256656168e6c496afc5f" +
                "b93246f6b1116398a346f1a641f3b041" +
                "e989f7914f90cc2c7fff357876e506b5" +
                "0d334ba77c225bc307ba537152f3f161" +
                "0e4eafe595f6d9d90d11faa933a15ef1" +
                "369546868a7f3a45a96768d40fd9d034" +
                "12c091c6315cf4fde7cb68606937380d" +
                "b2eaaa707b4c4185c32eddcdd306705e" +
                "4dc1ffc872eeee475a64dfac86aba41c" +
                "0618983f8741c5ef68d3a101e8a3b8ca" +
                "c60c905c15fc910840b94c00a0b9d0";

            CheckEd25519Vector(
                ("f5e5767cf153319517630f226876b86c"
                + "8160cc583bc013744c6bf255f5cc0ee5"),
                ("278117fc144c72340f67d0f2316e8386"
                + "ceffbf2b2428c9c51fef7c597f1d426e"),
                m,
                ("0aab4c900501b3e24d7cdf4663326a3a"
                + "87df5e4843b2cbdb67cbf6e460fec350"
                + "aa5371b1508f9f4528ecea23c436d94b"
                + "5e8fcd4f681e30a6ac00a9704a188a03"),
                "Ed25519 Vector #1023");
        }

        [Test]
        public void TestEd25519VectorSHAabc()
        {
            CheckEd25519Vector(
                ("833fe62409237b9d62ec77587520911e"
                + "9a759cec1d19755b7da901b96dca3d42"),
                ("ec172b93ad5e563bf4932c70e1245034"
                + "c35467ef2efd4d64ebf819683467e2bf"),
                ("ddaf35a193617abacc417349ae204131"
                + "12e6fa4e89a97ea20a9eeee64b55d39a"
                + "2192992a274fc1a836ba3c23a3feebbd"
                + "454d4423643ce80e2a9ac94fa54ca49f"),
                ("dc2a4459e7369633a52b1bf277839a00"
                + "201009a3efbf3ecb69bea2186c26b589"
                + "09351fc9ac90b3ecfdfbc7c66431e030"
                + "3dca179c138ac17ad9bef1177331a704"),
                "Ed25519 Vector SHA(abc)");
        }

        [Test]
        public void TestEd25519ctxVector1()
        {
            CheckEd25519ctxVector(
                ("0305334e381af78f141cb666f6199f57"
                + "bc3495335a256a95bd2a55bf546663f6"),
                ("dfc9425e4f968f7f0c29f0259cf5f9ae"
                + "d6851c2bb4ad8bfb860cfee0ab248292"),
                "f726936d19c800494e3fdaff20b276a8",
                "666f6f",
                ("55a4cc2f70a54e04288c5f4cd1e45a7b"
                + "b520b36292911876cada7323198dd87a"
                + "8b36950b95130022907a7fb7c4e9b2d5"
                + "f6cca685a587b4b21f4b888e4e7edb0d"),
                "Ed25519ctx Vector #1");
        }

        [Test]
        public void TestEd25519ctxVector2()
        {
            CheckEd25519ctxVector(
                ("0305334e381af78f141cb666f6199f57"
                + "bc3495335a256a95bd2a55bf546663f6"),
                ("dfc9425e4f968f7f0c29f0259cf5f9ae"
                + "d6851c2bb4ad8bfb860cfee0ab248292"),
                "f726936d19c800494e3fdaff20b276a8",
                "626172",
                ("fc60d5872fc46b3aa69f8b5b4351d580"
                + "8f92bcc044606db097abab6dbcb1aee3"
                + "216c48e8b3b66431b5b186d1d28f8ee1"
                + "5a5ca2df6668346291c2043d4eb3e90d"),
                "Ed25519ctx Vector #2");
        }

        [Test]
        public void TestEd25519ctxVector3()
        {
            CheckEd25519ctxVector(
                ("0305334e381af78f141cb666f6199f57"
                + "bc3495335a256a95bd2a55bf546663f6"),
                ("dfc9425e4f968f7f0c29f0259cf5f9ae"
                + "d6851c2bb4ad8bfb860cfee0ab248292"),
                "508e9e6882b979fea900f62adceaca35",
                "666f6f",
                ("8b70c1cc8310e1de20ac53ce28ae6e72"
                + "07f33c3295e03bb5c0732a1d20dc6490"
                + "8922a8b052cf99b7c4fe107a5abb5b2c"
                + "4085ae75890d02df26269d8945f84b0b"),
                "Ed25519ctx Vector #3");
        }

        [Test]
        public void TestEd25519ctxVector4()
        {
            CheckEd25519ctxVector(
                ("ab9c2853ce297ddab85c993b3ae14bca"
                + "d39b2c682beabc27d6d4eb20711d6560"),
                ("0f1d1274943b91415889152e893d80e9"
                + "3275a1fc0b65fd71b4b0dda10ad7d772"),
                "f726936d19c800494e3fdaff20b276a8",
                "666f6f",
                ("21655b5f1aa965996b3f97b3c849eafb"
                + "a922a0a62992f73b3d1b73106a84ad85"
                + "e9b86a7b6005ea868337ff2d20a7f5fb"
                + "d4cd10b0be49a68da2b2e0dc0ad8960f"),
                "Ed25519ctx Vector #4");
        }

        [Test]
        public void TestEd25519phVector1()
        {
            CheckEd25519phVector(
                ("833fe62409237b9d62ec77587520911e"
                + "9a759cec1d19755b7da901b96dca3d42"),
                ("ec172b93ad5e563bf4932c70e1245034"
                + "c35467ef2efd4d64ebf819683467e2bf"),
                "616263",
                "",
                ("98a70222f0b8121aa9d30f813d683f80"
                + "9e462b469c7ff87639499bb94e6dae41"
                + "31f85042463c2a355a2003d062adf5aa"
                + "a10b8c61e636062aaad11c2a26083406"),
                "Ed25519ph Vector #1");
        }

        [Test]
        public void TestPublicKeyValidationFull()
        {
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Neutral, 0));

            byte[] sk = new byte[Ed25519.SecretKeySize];
            byte[] pk = new byte[Ed25519.PublicKeySize];

            for (int i = 0; i < 10; ++i)
            {
                Random.NextBytes(sk);
                Ed25519.GeneratePublicKey(sk, 0, pk, 0);
                Assert.IsTrue(Ed25519.ValidatePublicKeyFull(pk, 0));
            }

            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("0100000000000000000000000000000000000000000000000000000000000080"), 0));

            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"), 0));

            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("D73D6044821BD0DF4068AE1792F0851170F53062150AA70A87E2A58A05A26115"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("F9D557BE0F3C700571CD8AD9CFDE0A2C67F88EE71830073C7756A0599311AD94"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("7A772BBC08D53BF381B150D8411B9AF134BBF24B90A038EFD8DA4A17B32606A1"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("DC6EF81316C08B91209A73FE8E208DD319F56C6A47956A03AF7D6D826A88AC87"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("6EEDF105177868C9AD48DAF2C36EE3B169D892A02A3BF83101B1D50D86BFB19E"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("4BAAB5711F22FF7479E6D9BD2C5BC4DCD3CFC9F36921971496907B1F2B62C6BA"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("D96A46432581A80085F978F7FC0977E228C5A3FD2E64D588BB5F5E5A84E4ABAE"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("10C326AE15FA5BA89EDDAB89C860797385298F4C7750BAEB94A5AAC9A876B538"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("7808F3F6EB858E9BBD2570F20A9F7502175F312FA2DBE4C96EB5C683B384AA60"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("0DE943C51E91AA3ED9FFA82D39A9813D94F59246452F6A7780D067BC61342FE1"), 0));

            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("10026DBFB4C55628716BB0EF979A10DD5AC7AA970C229B5E68DD993E2C20E7D5"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("68EC52D16C1DB4483AA8679277C34E0DC56EB7D064D302B9749F0D31A901D484"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("6E54C8F00669422D5697E09C0575AE1E699841ACF1690A5DFAA25E3160F3A2EF"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("CA66B62D361F790AA9658161BA0FFDC3CE60624151258C7301926DFE0C67EE64"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("88D912C322AE3D0907B38ED08727FBF06D51C5D1DE622B5BC24DAB30078AE9FF"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("F24683E044CE3F14BCA24F1356AE7767509E17EFA2606438BA275860819E14B8"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("B2865F02E6D19A94CE6147B574095733B3628A2FBE2C84022262D88F7D6C4F7D"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("FA4DA03321816C1C9066BD250982DDD1B4349C43C5E124D2B39F8DDA4E5364F8"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("FCADF40DE51A943F3B7847DBEBA0627B33D020D81DFFABF2B3701BD9B746952A"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyFull(Hex.DecodeStrict("379B071E6F7E2479D5A8588AB708137808D63F689127D4A228E2C1681873C55E"), 0));
        }

        [Test]
        public void TestPublicKeyValidationPartial()
        {
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Neutral, 0));

            byte[] sk = new byte[Ed25519.SecretKeySize];
            byte[] pk = new byte[Ed25519.PublicKeySize];

            for (int i = 0; i < 10; ++i)
            {
                Random.NextBytes(sk);
                Ed25519.GeneratePublicKey(sk, 0, pk, 0);
                Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(pk, 0));
            }

            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("0100000000000000000000000000000000000000000000000000000000000080"), 0));

            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"), 0));

            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("D73D6044821BD0DF4068AE1792F0851170F53062150AA70A87E2A58A05A26115"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("F9D557BE0F3C700571CD8AD9CFDE0A2C67F88EE71830073C7756A0599311AD94"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("7A772BBC08D53BF381B150D8411B9AF134BBF24B90A038EFD8DA4A17B32606A1"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("DC6EF81316C08B91209A73FE8E208DD319F56C6A47956A03AF7D6D826A88AC87"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("6EEDF105177868C9AD48DAF2C36EE3B169D892A02A3BF83101B1D50D86BFB19E"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("4BAAB5711F22FF7479E6D9BD2C5BC4DCD3CFC9F36921971496907B1F2B62C6BA"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("D96A46432581A80085F978F7FC0977E228C5A3FD2E64D588BB5F5E5A84E4ABAE"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("10C326AE15FA5BA89EDDAB89C860797385298F4C7750BAEB94A5AAC9A876B538"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("7808F3F6EB858E9BBD2570F20A9F7502175F312FA2DBE4C96EB5C683B384AA60"), 0));
            Assert.IsFalse(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("0DE943C51E91AA3ED9FFA82D39A9813D94F59246452F6A7780D067BC61342FE1"), 0));

            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("10026DBFB4C55628716BB0EF979A10DD5AC7AA970C229B5E68DD993E2C20E7D5"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("68EC52D16C1DB4483AA8679277C34E0DC56EB7D064D302B9749F0D31A901D484"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("6E54C8F00669422D5697E09C0575AE1E699841ACF1690A5DFAA25E3160F3A2EF"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("CA66B62D361F790AA9658161BA0FFDC3CE60624151258C7301926DFE0C67EE64"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("88D912C322AE3D0907B38ED08727FBF06D51C5D1DE622B5BC24DAB30078AE9FF"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("F24683E044CE3F14BCA24F1356AE7767509E17EFA2606438BA275860819E14B8"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("B2865F02E6D19A94CE6147B574095733B3628A2FBE2C84022262D88F7D6C4F7D"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("FA4DA03321816C1C9066BD250982DDD1B4349C43C5E124D2B39F8DDA4E5364F8"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("FCADF40DE51A943F3B7847DBEBA0627B33D020D81DFFABF2B3701BD9B746952A"), 0));
            Assert.IsTrue(Ed25519.ValidatePublicKeyPartial(Hex.DecodeStrict("379B071E6F7E2479D5A8588AB708137808D63F689127D4A228E2C1681873C55E"), 0));
        }

        private static void CheckEd25519Vector(string sSK, string sPK, string sM, string sSig, string text)
        {
            byte[] sk = Hex.Decode(sSK);
            byte[] pk = Hex.Decode(sPK);

            byte[] pkGen = new byte[Ed25519.PublicKeySize];
            Ed25519.GeneratePublicKey(sk, 0, pkGen, 0);
            Assert.IsTrue(Arrays.AreEqual(pk, pkGen), text);
         
			byte[] m = Hex.Decode(sM);
            byte[] sig = Hex.Decode(sSig);

            byte[] badsig = Arrays.Clone(sig);
            badsig[Ed25519.SignatureSize - 1] ^= 0x80;

            byte[] sigGen = new byte[Ed25519.SignatureSize];
            Ed25519.Sign(sk, 0, m, 0, m.Length, sigGen, 0);
            Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);

            Ed25519.Sign(sk, 0, pk, 0, m, 0, m.Length, sigGen, 0);
            Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);

            bool shouldVerify = Ed25519.Verify(sig, 0, pk, 0, m, 0, m.Length);
            Assert.IsTrue(shouldVerify, text);

            bool shouldNotVerify = Ed25519.Verify(badsig, 0, pk, 0, m, 0, m.Length);
            Assert.IsFalse(shouldNotVerify, text);
        }

        private static void CheckEd25519ctxVector(string sSK, string sPK, string sM, string sCTX, string sSig, string text)
        {
            byte[] sk = Hex.Decode(sSK);
            byte[] pk = Hex.Decode(sPK);

            byte[] pkGen = new byte[Ed25519.PublicKeySize];
            Ed25519.GeneratePublicKey(sk, 0, pkGen, 0);
            Assert.IsTrue(Arrays.AreEqual(pk, pkGen), text);

            byte[] m = Hex.Decode(sM);
            byte[] ctx = Hex.Decode(sCTX);
            byte[] sig = Hex.Decode(sSig);

            byte[] badsig = Arrays.Clone(sig);
            badsig[Ed25519.SignatureSize - 1] ^= 0x80;

            byte[] sigGen = new byte[Ed25519.SignatureSize];
            Ed25519.Sign(sk, 0, ctx, m, 0, m.Length, sigGen, 0);
            Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);

            Ed25519.Sign(sk, 0, pk, 0, ctx, m, 0, m.Length, sigGen, 0);
            Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);

            bool shouldVerify = Ed25519.Verify(sig, 0, pk, 0, ctx, m, 0, m.Length);
            Assert.IsTrue(shouldVerify, text);

            bool shouldNotVerify = Ed25519.Verify(badsig, 0, pk, 0, ctx, m, 0, m.Length);
            Assert.IsFalse(shouldNotVerify, text);
        }

        private static void CheckEd25519phVector(string sSK, string sPK, string sM, string sCTX, string sSig, string text)
        {
            byte[] sk = Hex.Decode(sSK);
            byte[] pk = Hex.Decode(sPK);

            byte[] pkGen = new byte[Ed25519.PublicKeySize];
            Ed25519.GeneratePublicKey(sk, 0, pkGen, 0);
            Assert.IsTrue(Arrays.AreEqual(pk, pkGen), text);

            byte[] m = Hex.Decode(sM);
            byte[] ctx = Hex.Decode(sCTX);
            byte[] sig = Hex.Decode(sSig);

            byte[] badsig = Arrays.Clone(sig);
            badsig[Ed25519.SignatureSize - 1] ^= 0x80;

            byte[] sigGen = new byte[Ed25519.SignatureSize];

            {
                IDigest prehash = Ed25519.CreatePrehash();
                prehash.BlockUpdate(m, 0, m.Length);

                byte[] ph = new byte[Ed25519.PrehashSize];
                prehash.DoFinal(ph, 0);

                Ed25519.SignPrehash(sk, 0, ctx, ph, 0, sigGen, 0);
                Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);

                Ed25519.SignPrehash(sk, 0, pk, 0, ctx, ph, 0, sigGen, 0);
                Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);

                bool shouldVerify = Ed25519.VerifyPrehash(sig, 0, pk, 0, ctx, ph, 0);
                Assert.IsTrue(shouldVerify, text);

                bool shouldNotVerify = Ed25519.VerifyPrehash(badsig, 0, pk, 0, ctx, ph, 0);
                Assert.IsFalse(shouldNotVerify, text);
            }

            {
                IDigest ph = Ed25519.CreatePrehash();
                ph.BlockUpdate(m, 0, m.Length);

                Ed25519.SignPrehash(sk, 0, ctx, ph, sigGen, 0);
                Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);
            }

            {
                IDigest ph = Ed25519.CreatePrehash();
                ph.BlockUpdate(m, 0, m.Length);

                Ed25519.SignPrehash(sk, 0, pk, 0, ctx, ph, sigGen, 0);
                Assert.IsTrue(Arrays.AreEqual(sig, sigGen), text);
            }

            {
                IDigest ph = Ed25519.CreatePrehash();
                ph.BlockUpdate(m, 0, m.Length);

                bool shouldVerify = Ed25519.VerifyPrehash(sig, 0, pk, 0, ctx, ph);
                Assert.IsTrue(shouldVerify, text);
            }

            {
                IDigest ph = Ed25519.CreatePrehash();
                ph.BlockUpdate(m, 0, m.Length);

                bool shouldNotVerify = Ed25519.VerifyPrehash(badsig, 0, pk, 0, ctx, ph);
                Assert.IsFalse(shouldNotVerify, text);
            }
        }
    }
}
