コード例 #1
0
ファイル: X509CRL.cs プロジェクト: waffle-iron/nequeo
        internal bool VerifySignature(DSA dsa)
        {
            if (signatureOID != "1.2.840.10040.4.3")
            {
                throw new CryptographicException("Unsupported hash algorithm: " + signatureOID);
            }
            DSASignatureDeformatter v = new DSASignatureDeformatter(dsa);

            // only SHA-1 is supported
            v.SetHashAlgorithm("SHA1");
            ASN1 sign = new ASN1(signature);

            if ((sign == null) || (sign.Count != 2))
            {
                return(false);
            }
            // parts may be less than 20 bytes (i.e. first bytes were 0x00)
            byte[] part1 = sign [0].Value;
            byte[] part2 = sign [1].Value;
            byte[] sig   = new byte [40];
            // parts may be less than 20 bytes (i.e. first bytes were 0x00)
            // parts may be more than 20 bytes (i.e. first byte > 0x80, negative)
            int s1 = System.Math.Max(0, part1.Length - 20);
            int e1 = System.Math.Max(0, 20 - part1.Length);

            Buffer.BlockCopy(part1, s1, sig, e1, part1.Length - s1);
            int s2 = System.Math.Max(0, part2.Length - 20);
            int e2 = System.Math.Max(20, 40 - part2.Length);

            Buffer.BlockCopy(part2, s2, sig, e2, part2.Length - s2);
            return(v.VerifySignature(Hash, sig));
        }
コード例 #2
0
        internal bool VerifySignature(System.Security.Cryptography.DSA dsa)
        {
            DSASignatureDeformatter deformatter = new DSASignatureDeformatter(dsa);

            deformatter.SetHashAlgorithm("SHA1");
            return(deformatter.VerifySignature(this.Hash, this.Signature));
        }
コード例 #3
0
        internal bool VerifySignature(DSA dsa)
        {
            DSASignatureDeformatter dsasignatureDeformatter = new DSASignatureDeformatter(dsa);

            dsasignatureDeformatter.SetHashAlgorithm("SHA1");
            return(dsasignatureDeformatter.VerifySignature(this.Hash, this.Signature));
        }
コード例 #4
0
        public static bool Verify(byte[] hash, byte[] signedHash, string hashAlgo, AsymmetricEncryptionAlgorithm cryptoAlgo, string publicKey)
        {
            switch (cryptoAlgo)
            {
            case AsymmetricEncryptionAlgorithm.RSA:
                using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
                {
                    RSA.FromXmlString(publicKey);

                    return(RSA.VerifyHash(hash, CryptoConfig.MapNameToOID(hashAlgo), signedHash));
                }

            case AsymmetricEncryptionAlgorithm.DSA:
                using (DSACryptoServiceProvider DSA = new DSACryptoServiceProvider())
                {
                    DSA.FromXmlString(publicKey);

                    DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(DSA);
                    DSADeformatter.SetHashAlgorithm(hashAlgo);

                    return(DSADeformatter.VerifySignature(hash, signedHash));
                }

            default:
                throw new NotImplementedException("Feature not implemented for specified algorithm.");
            }
        }
コード例 #5
0
        public static bool ValidatePathWithEncodedDSASignatureAndPublicDSAKey(string path, string base64Signature, string publicKey)
        {
            try {
                byte[] signature = Convert.FromBase64String(base64Signature);
                byte[] data      = File.ReadAllBytes(path);
                SHA1CryptoServiceProvider cryptoTransformSHA1 = new SHA1CryptoServiceProvider();
                byte[] sha1Hash = cryptoTransformSHA1.ComputeHash(data);
                string cleanKey = "";

                string[] lines = publicKey.Split(new char[] { '\n', '\r' });

                foreach (string line in lines)
                {
                    cleanKey += line.Trim();
                }

                byte[] publicKeyData = Convert.FromBase64String(cleanKey);

                DSACryptoServiceProvider provider = new DSACryptoServiceProvider();
                provider.ImportCspBlob(publicKeyData);
                DSASignatureDeformatter formatter = new DSASignatureDeformatter(provider);
                formatter.SetHashAlgorithm("SHA1");
                return(formatter.VerifySignature(sha1Hash, signature));
            } catch (Exception ex) {
                Console.WriteLine(ex.Message);
                return(false);
            }
        }
コード例 #6
0
        internal bool VerifySignature(DSA dsa)
        {
            if (signatureOID != "1.2.840.10040.4.3")
            {
                throw new CryptographicException("Unsupported hash algorithm: " + signatureOID);
            }
            DSASignatureDeformatter dSASignatureDeformatter = new DSASignatureDeformatter(dsa);

            dSASignatureDeformatter.SetHashAlgorithm("SHA1");
            ASN1 aSN = new ASN1(signature);

            if (aSN == null || aSN.Count != 2)
            {
                return(false);
            }
            byte[] value     = aSN[0].Value;
            byte[] value2    = aSN[1].Value;
            byte[] array     = new byte[40];
            int    num       = System.Math.Max(0, value.Length - 20);
            int    dstOffset = System.Math.Max(0, 20 - value.Length);

            Buffer.BlockCopy(value, num, array, dstOffset, value.Length - num);
            int num2       = System.Math.Max(0, value2.Length - 20);
            int dstOffset2 = System.Math.Max(20, 40 - value2.Length);

            Buffer.BlockCopy(value2, num2, array, dstOffset2, value2.Length - num2);
            return(dSASignatureDeformatter.VerifySignature(Hash, array));
        }
コード例 #7
0
        /// <summary>
        /// 验证签名方法实现
        /// </summary>
        /// <param name="valueToSign">被签名的原始数据</param>
        /// <param name="signedHashValue">签名值</param>
        /// <param name="dsaKeyInfo">私钥信息</param>
        /// <param name="hashAlg">Hash算法名称</param>
        /// <returns></returns>
        public static bool DsaVerifyHash(byte[] valueToSign, byte[] signedHashValue, DSAParameters dsaKeyInfo, string hashAlg)
        {
            if (string.IsNullOrEmpty(hashAlg))
            {
                throw new ArgumentNullException(hashAlg);
            }
            bool verified;

            try
            {
                using (DSACryptoServiceProvider dsa = new DSACryptoServiceProvider())
                {
                    dsa.ImportParameters(dsaKeyInfo);
                    DSASignatureDeformatter dsaFormatter = new DSASignatureDeformatter(dsa);
                    dsaFormatter.SetHashAlgorithm(hashAlg);
                    verified = dsaFormatter.VerifySignature(valueToSign, signedHashValue);
                }
            }
            catch (CryptographicException e)
            {
                throw new CryptographicException(e.Message);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            return(verified);
        }
コード例 #8
0
ファイル: MainForm.cs プロジェクト: hui6xin/BookC-network
 private void buttonVerify_Click(object sender, EventArgs e)
 {
     //为简化起见,此处假定接收方已经接收到发
     //送方发送的hashValue、signedHashValue以及公钥
     //同时保证接收方和签名方使用相同的哈希算法(均为“SHA1”)
     try
     {
         DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();
         dsa.ImportParameters(dsaKeyInfo);
         DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(dsa);
         DSADeformatter.SetHashAlgorithm("SHA1");
         if (DSADeformatter.VerifySignature(hashValue, signedHashValue))
         {
             textBoxVerifyResult.Text = "验证成功";
         }
         else
         {
             textBoxVerifyResult.Text = "验证失败";
         }
     }
     catch (CryptographicException err)
     {
         MessageBox.Show(err.Message);
     }
 }
コード例 #9
0
        public static bool DSAVerifyHash(byte[] HashValue, byte[] SignedHashValue,
                                         DSAParameters DSAKeyInfo, string HashAlg)
        {
            bool verified = false;

            try
            {
                // Create a new instance of DSACryptoServiceProvider.
                using (DSACryptoServiceProvider DSA = new DSACryptoServiceProvider())  // BAD
                {
                    // Import the key information.
                    DSA.ImportParameters(DSAKeyInfo);

                    // Create an DSASignatureDeformatter object and pass it the
                    // DSACryptoServiceProvider to transfer the private key.
                    DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(DSA);

                    // Set the hash algorithm to the passed value.
                    DSADeformatter.SetHashAlgorithm(HashAlg);

                    // Verify signature and return the result.
                    verified = DSADeformatter.VerifySignature(HashValue, SignedHashValue);
                }
            }
            catch (CryptographicException e)
            {
                Console.WriteLine(e.Message);
            }

            return(verified);
        }
コード例 #10
0
ファイル: X509Crl.cs プロジェクト: ramayasket/Web.Transfer
        internal bool VerifySignature(DSA dsa)
        {
            if (this.signatureOID != "1.2.840.10040.4.3")
            {
                throw new CryptographicException("Unsupported hash algorithm: " + this.signatureOID);
            }
            DSASignatureDeformatter deformatter = new DSASignatureDeformatter(dsa);

            deformatter.SetHashAlgorithm("SHA1");
            ASN1 asn = new ASN1(this.signature);

            if ((asn == null) || (asn.Count != 2))
            {
                return(false);
            }
            byte[] src       = asn[0].Value;
            byte[] buffer2   = asn[1].Value;
            byte[] dst       = new byte[40];
            int    srcOffset = Math.Max(0, src.Length - 20);
            int    dstOffset = Math.Max(0, 20 - src.Length);

            Buffer.BlockCopy(src, srcOffset, dst, dstOffset, src.Length - srcOffset);
            int num3 = Math.Max(0, buffer2.Length - 20);
            int num4 = Math.Max(20, 40 - buffer2.Length);

            Buffer.BlockCopy(buffer2, num3, dst, num4, buffer2.Length - num3);
            return(deformatter.VerifySignature(this.Hash, dst));
        }
コード例 #11
0
        public static bool CheckSign(byte[] data, string xmlStringPubKey)
        {
            bool checkResult;

            DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();

            dsa.FromXmlString(xmlStringPubKey);

            DSASignatureDeformatter dSADeformatter = new DSASignatureDeformatter(dsa);

            dSADeformatter.SetHashAlgorithm("SHA1");

            using (MemoryStream ms = new MemoryStream(data))
            {
                byte[] signedHashLength = new byte[4];
                ms.Seek(0, SeekOrigin.Begin);
                ms.Read(signedHashLength, 0, 3);
                byte[] signedHash = new byte[BitConverter.ToInt32(signedHashLength, 0)];
                ms.Seek(4, SeekOrigin.Begin);
                ms.Read(signedHash, 0, signedHash.Length);

                byte[] dat  = ReturnDataWithoutHash(data);
                byte[] hash = GetSha1Hash(dat);

                checkResult = dSADeformatter.VerifySignature(hash, signedHash);
            }

            return(checkResult);
        }
コード例 #12
0
        public static string Hash(string text)
        {
            try
            {
                byte[] Hash = Sha1Hash(text);
                DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();

                DSASignatureFormatter dSASignatureFormatter = new DSASignatureFormatter(dsa);

                dSASignatureFormatter.SetHashAlgorithm("SHA1");
                byte[] SignedHash = dSASignatureFormatter.CreateSignature(Hash);
                string sign       = Convert.ToBase64String(SignedHash);
                DSASignatureDeformatter dSASignatureDeformatter = new DSASignatureDeformatter(dsa);
                if (dSASignatureDeformatter.VerifySignature(Hash, SignedHash))
                {
                    return(sign);
                }
                else
                {
                    return(null);
                }
            }
            catch (Exception ex)
            {
                throw new Exception("Error! During DSA Hash siganture generation.");
            }
        }
コード例 #13
0
		internal bool VerifySignature (DSA dsa) 
		{
			// signatureOID is check by both this.Hash and this.Signature
			DSASignatureDeformatter v = new DSASignatureDeformatter (dsa);
			// only SHA-1 is supported
			v.SetHashAlgorithm ("SHA1");
			return v.VerifySignature (this.Hash, this.Signature);
		}
コード例 #14
0
        public bool Verify(string message, byte[] signature)
        {
            DSASignatureDeformatter dsdfm = new DSASignatureDeformatter(_alg);

            dsdfm.SetHashAlgorithm(_hashfn);
            Byte[] messagebyte = new UnicodeEncoding().GetBytes(message);
            Byte[] hash        = HashAlgorithm.Create(_hashfn).ComputeHash(messagebyte);
            return(dsdfm.VerifySignature(hash, signature));
        }
コード例 #15
0
ファイル: DSA.cs プロジェクト: ledthh/StudMail
 public static bool VerifySign(string msg, string msgSign, string publicSignKey)
 {
     using (var provider = new DSACryptoServiceProvider())
     {
         var signature = Convert.FromBase64String(msgSign);
         provider.ImportCspBlob(Convert.FromBase64String(publicSignKey));
         var deformatter = new DSASignatureDeformatter(provider);
         deformatter.SetHashAlgorithm("SHA1");
         return(deformatter.VerifySignature(UserSHA1.ComputeHashSHA1(msg), signature));
     }
 }
コード例 #16
0
 /// <summary>
 /// Validates the signature that follows the Licence data
 /// </summary>
 /// <param name="hashValue">Hash value</param>
 /// <param name="signedHashValue">Signed hash value</param>
 /// <param name="xmlKeyInfo">Public Key</param>
 /// <param name="hashAlg">Hash Algorithm</param>
 /// <returns>True if signature is valid</returns>
 private static bool DSAVerifyHash(byte[] hashValue, byte[] signedHashValue, string xmlKeyInfo, string hashAlg)
 {
     DSACryptoServiceProvider.UseMachineKeyStore = false;
     using (DSACryptoServiceProvider DSA = new DSACryptoServiceProvider())
     {
         DSA.FromXmlString(xmlKeyInfo);
         DSASignatureDeformatter DSAFormatter = new DSASignatureDeformatter(DSA);
         DSAFormatter.SetHashAlgorithm(hashAlg);
         return(DSAFormatter.VerifySignature(hashValue, signedHashValue));
     }
 }
 public static void VerifySignature_SHA1()
 {
     using (DSA dsa = DSAFactory.Create())
     {
         var formatter   = new DSASignatureFormatter(dsa);
         var deformatter = new DSASignatureDeformatter(dsa);
         using (SHA1 alg = SHA1.Create())
         {
             VerifySignature(formatter, deformatter, alg, "SHA1");
             VerifySignature(formatter, deformatter, alg, "sha1");
         }
     }
 }
コード例 #18
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 public static void VerifySignature_SHA1()
 {
     using (DSA dsa = DSAFactory.Create())
     {
         var formatter = new DSASignatureFormatter(dsa);
         var deformatter = new DSASignatureDeformatter(dsa);
         using (SHA1 alg = SHA1.Create())
         {
             VerifySignature(formatter, deformatter, alg, "SHA1");
             VerifySignature(formatter, deformatter, alg, "sha1");
         }
     }
 }
コード例 #19
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 //--METHOD UNTUK VERIVIKASI SIGNATURE
 static bool VerifySignature(byte[] dataSign, byte[] SignData, string publicKey)
 {
     //--CREATE OBJEK DSACryptoServiceProvider
     using (DSACryptoServiceProvider dsa = new DSACryptoServiceProvider())
     {
         //--SET PUBLIC KEY
         dsa.FromXmlString(publicKey);
         //--CREATE DEFORMATTER UNTUK MENTRANSFER KEY
         DSASignatureDeformatter deformatter = new DSASignatureDeformatter(dsa);
         //--SETTING HASH ALGORITHM UNTUK SHA1
         deformatter.SetHashAlgorithm("SHA1");
         //--VERIFY SIGNATURE
         return(deformatter.VerifySignature(dataSign, SignData));
     }
 }
コード例 #20
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        public static void VerifySignature_SHA1()
        {
            using (DSA dsa = DSAFactory.Create())
            {
                dsa.ImportParameters(DSATestData.GetDSA1024Params());

                var formatter   = new DSASignatureFormatter(dsa);
                var deformatter = new DSASignatureDeformatter(dsa);

                using (SHA1 alg = SHA1.Create())
                {
                    VerifySignature(formatter, deformatter, alg, "SHA1");
                    VerifySignature(formatter, deformatter, alg, "sha1");
                }
            }
        }
コード例 #21
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        public bool Verify(byte[] hash, byte[] signedHash, string hashAlgo)
        {
            switch (_cryptoAlgo)
            {
            case AsymmetricEncryptionAlgorithm.RSA:
                return((_asymAlgo as RSACryptoServiceProvider).VerifyHash(hash, CryptoConfig.MapNameToOID(hashAlgo), signedHash));

            case AsymmetricEncryptionAlgorithm.DSA:
                DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(_asymAlgo);
                DSADeformatter.SetHashAlgorithm(hashAlgo);
                return(DSADeformatter.VerifySignature(hash, signedHash));

            default:
                throw new NotImplementedException("Feature not implemented for specified algorithm.");
            }
        }
コード例 #22
0
ファイル: DSAHelper.cs プロジェクト: 15831944/Apq
        /// <summary>
        /// DSA验证
        /// </summary>
        /// <param name="CypherText">签名后的Base64字符串</param>
        /// <param name="xmlString">密钥(至少含公钥)</param>
        /// <param name="signString">签名串</param>
        public static bool VerifyString(string CypherText, string xmlString, string signString)
        {
            DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();

            dsa.FromXmlString(xmlString);

            if (!string.IsNullOrEmpty(CypherText))
            {
                byte[] bEnc  = System.Convert.FromBase64String(CypherText);
                byte[] bText = System.Text.Encoding.UTF8.GetBytes(signString.ToCharArray());

                DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(dsa);
                DSADeformatter.SetHashAlgorithm("SHA1");
                return(DSADeformatter.VerifySignature(bEnc, bText));
            }
            return(false);
        }
コード例 #23
0
        /// <summary>
        /// 验证签名数据。
        /// </summary>
        /// <param name="hashValue">哈希数据。</param>
        /// <param name="signedData">已签名的哈希数据。</param>
        /// <param name="hashAlg">哈希算法名称。</param>
        /// <param name="publicKeyXmlString">公钥数据。</param>
        /// <returns>验证通过返回True,否则返回False。</returns>
        private static bool DsaVerifyHash(byte[] hashValue, byte[] signedData, string hashAlg, string publicKeyXmlString)
        {
            try
            {
                var dsa = new DSACryptoServiceProvider();
                dsa.FromXmlString(publicKeyXmlString);

                var signatureDeformatter = new DSASignatureDeformatter(dsa);
                signatureDeformatter.SetHashAlgorithm(hashAlg);

                return(signatureDeformatter.VerifySignature(hashValue, signedData));
            }
            catch (CryptographicException)
            {
                return(false);
            }
        }
コード例 #24
0
        public static bool verifySignature(byte[] hashValue, byte[] signature)
        {
            if (JAM_dotnet_verification_use_machine_keys() == 0)
            {
                DSACryptoServiceProvider.UseMachineKeyStore = true;
            }
            else
            {
                DSACryptoServiceProvider.UseMachineKeyStore = false;
            }
            DSACryptoServiceProvider key = new DSACryptoServiceProvider();

            key.ImportParameters(dsaParms);
            DSASignatureDeformatter deformatter = new DSASignatureDeformatter(key);

            deformatter.SetHashAlgorithm("SHA1");
            return(deformatter.VerifySignature(hashValue, signature));
        }
コード例 #25
0
ファイル: EncryptDecryptHelper.cs プロジェクト: IvanWhisper/-
        /// <summary>
        /// 校验签名是否正确
        /// </summary>
        /// <param name="decryptString"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static bool VerifySignature(string decryptString, string key = strKeys)
        {
            bool ret = false;

            byte[] hashValue = { 22, 45, 78, 53, 1, 2, 205, 98, 75, 123, 45, 76, 143, 189, 205, 65, 12, 193, 211, 255 };
            DSACryptoServiceProvider signer    = new DSACryptoServiceProvider();
            DSASignatureFormatter    formatter = new DSASignatureFormatter(signer);

            formatter.SetHashAlgorithm("SHA1");
            byte[] signedHashValue = formatter.CreateSignature(hashValue);
            DSASignatureDeformatter deformatter = new DSASignatureDeformatter(signer);

            deformatter.SetHashAlgorithm("SHA1");

            ret = deformatter.VerifySignature(hashValue, signedHashValue);
            signer.Clear();
            return(ret);
        }
コード例 #26
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 public bool VerifySignature(Stream stream, string signature)
 {
     try
     {
         using (var dsaCryptoProvider = new DSACryptoServiceProvider())
         {
             byte[] hash = (new SHA1Managed()).ComputeHash(stream);//for file or text
             dsaCryptoProvider.ImportParameters(PublicKey);
             var dsaDeformatter = new DSASignatureDeformatter(dsaCryptoProvider);
             dsaDeformatter.SetHashAlgorithm("SHA1");
             return(dsaDeformatter.VerifySignature(hash, StringToByteArray(signature)));
         }
     }
     catch (CryptographicException e)
     {
         return(false);
     }
 }
コード例 #27
0
ファイル: DynamoCrypto.cs プロジェクト: Jamesbdsas/DynamoDS
        /// <summary>
        /// Verify a file using a signature file and a public key.
        /// </summary>
        /// <param name="filePath">The file whose contents will be hashed.</param>
        /// <param name="signatureFilePath">The path of the signature file.</param>
        /// <param name="publicBlob">The public key.</param>
        /// <returns> True if the file is verified, otherwise false.</returns>
        public static bool VerifyFile(string filePath, string signatureFilePath, byte[] publicBlob)
        {
            if (publicBlob.Length == 0)
            {
                return(false);
            }

            bool verified = false;

            byte[] hash = null;

            try
            {
                // Compute a hash of the installer
                using (Stream fileStream = File.Open(filePath, FileMode.Open))
                {
                    SHA1 sha1 = new SHA1CryptoServiceProvider();
                    hash = sha1.ComputeHash(fileStream);
                }

                // Import the public key
                var dsa = new DSACryptoServiceProvider();
                dsa.ImportCspBlob(publicBlob);

                var dsaDeformatter = new DSASignatureDeformatter(dsa);
                dsaDeformatter.SetHashAlgorithm("SHA1");

                // Read the signature file
                byte[] signature = File.ReadAllBytes(signatureFilePath);

                // Verify the signature against the hash of the installer
                verified = dsaDeformatter.VerifySignature(hash, signature);

                Console.WriteLine("File verified: {0}", verified);
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);

                return(false);
            }

            return(verified);
        }
コード例 #28
0
        public static void InvalidHashAlgorithm()
        {
            using (DSA dsa = DSAFactory.Create())
            {
                var formatter = new DSASignatureFormatter(dsa);
                var deformatter = new DSASignatureDeformatter(dsa);

                // Unlike RSA, DSA will throw during SetHashAlgorithm
                Assert.Throws<CryptographicUnexpectedOperationException>(() =>
                    formatter.SetHashAlgorithm("INVALIDVALUE"));
                Assert.Throws<CryptographicUnexpectedOperationException>(() =>
                    deformatter.SetHashAlgorithm("INVALIDVALUE"));

                // Currently anything other than SHA1 fails
                Assert.Throws<CryptographicUnexpectedOperationException>(() =>
                    formatter.SetHashAlgorithm("SHA256"));
                Assert.Throws<CryptographicUnexpectedOperationException>(() =>
                    deformatter.SetHashAlgorithm("SHA256"));
            }
        }
コード例 #29
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        public static void VerifyKnownSignature()
        {
            using (DSA dsa = DSAFactory.Create())
            {
                byte[]        data;
                byte[]        signature;
                DSAParameters dsaParameters;
                DSATestData.GetDSA1024_186_2(out dsaParameters, out signature, out data);

                byte[] hash = SHA1.HashData(data);

                dsa.ImportParameters(dsaParameters);
                var deformatter = new DSASignatureDeformatter(dsa);
                deformatter.VerifySignature(hash, signature);

                // Negative case
                signature[signature.Length - 1] ^= 0xff;
                Assert.False(deformatter.VerifySignature(hash, signature));
            }
        }
コード例 #30
0
        public static void InvalidHashAlgorithm()
        {
            using (DSA dsa = DSAFactory.Create())
            {
                var formatter   = new DSASignatureFormatter(dsa);
                var deformatter = new DSASignatureDeformatter(dsa);

                // Unlike RSA, DSA will throw during SetHashAlgorithm
                Assert.Throws <CryptographicUnexpectedOperationException>(() =>
                                                                          formatter.SetHashAlgorithm("INVALIDVALUE"));
                Assert.Throws <CryptographicUnexpectedOperationException>(() =>
                                                                          deformatter.SetHashAlgorithm("INVALIDVALUE"));

                // Currently anything other than SHA1 fails
                Assert.Throws <CryptographicUnexpectedOperationException>(() =>
                                                                          formatter.SetHashAlgorithm("SHA256"));
                Assert.Throws <CryptographicUnexpectedOperationException>(() =>
                                                                          deformatter.SetHashAlgorithm("SHA256"));
            }
        }
コード例 #31
0
ファイル: MainForm.cs プロジェクト: Fargose/BPTD5OlekiiRoik
        private bool DsaVerifyHash(byte[] hashValue, byte[] signedHashValue, DSAParameters dsaKey, string hashAlg)
        {
            var verified = false;

            try
            {
                using (var dsa = new DSACryptoServiceProvider())
                {
                    dsa.ImportParameters(dsaKey);
                    var dsaDeformatter = new DSASignatureDeformatter(dsa);
                    dsaDeformatter.SetHashAlgorithm(hashAlg);
                    verified = dsaDeformatter.VerifySignature(hashValue, signedHashValue);
                }
            }
            catch (CryptographicException e)
            {
                MessageBox.Show(e.Message);
            }
            return(verified);
        }
コード例 #32
0
ファイル: UserControlDSAS.cs プロジェクト: fid9/CryptoBook
        private void BtnVerify_Click(object sender, EventArgs e)
        {
            DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(DSAC);

            DSADeformatter.SetHashAlgorithm("SHA1");
            SHA1Managed SHhash = new SHA1Managed();

            if (DSADeformatter.VerifySignature(SHhash.ComputeHash(new UnicodeEncoding().GetBytes(textboxplaintext.Text)),
                                               Convert.FromBase64String(textboxsigned.Text))
                )
            {
                MessageBox.Show("The signature is valid.");
                /// The signature is valid.
            }
            else
            {
                MessageBox.Show("The signature is not valid.");
                /// The signature is not valid.
            }
        }
コード例 #33
0
        public static void VerifyKnownSignature()
        {
            using (DSA dsa = DSAFactory.Create())
            {
                byte[] data;
                byte[] signature;
                DSAParameters dsaParameters;
                DSATestData.GetDSA1024_186_2(out dsaParameters, out signature, out data);

                byte[] hash;
                using (SHA1 alg = SHA1.Create())
                {
                    hash = alg.ComputeHash(data);
                }

                dsa.ImportParameters(dsaParameters);
                var deformatter = new DSASignatureDeformatter(dsa);
                deformatter.VerifySignature(hash, signature);

                // Negative case
                signature[signature.Length - 1] ^= 0xff;
                Assert.False(deformatter.VerifySignature(hash, signature));
            }
        }