C# Cryptography.HashAlgorithm类代码示例

 /// <summary>
 ///     Creates a message digest using the specified name to set Algorithm property.
 /// </summary>
 /// <param name="algorithm">The name of the algorithm to use</param>
 public MD5Support(string algorithm)
 {
     var algorithmName = algorithm.Equals("SHA-1") ? "SHA" : algorithm;
     _algorithm = (HashAlgorithm) CryptoConfig.CreateFromName(algorithmName);
     data = new byte[0];
     _position = 0;
 }

 public VartotojaiController(IAuthenticationProvider authenticationProvider, ISessionFactory sessionFactory, [LoggedIn] UserInformation loggedInUser, HashAlgorithm hashAlgorithm)
 {
     _authenticationProvider = authenticationProvider;
     _sessionFactory = sessionFactory;
     _loggedInUser = loggedInUser;
     _hashAlgorithm = hashAlgorithm;
 }

 public void WriteHash(HashAlgorithm hash, DocPosition docPos, AncestralNamespaceContextManager anc)
 {
     if (this.IsInNodeSet)
     {
         byte[] bytes;
         UTF8Encoding encoding = new UTF8Encoding(false);
         if (docPos == DocPosition.AfterRootElement)
         {
             bytes = encoding.GetBytes("(char) 10");
             hash.TransformBlock(bytes, 0, bytes.Length, bytes, 0);
         }
         bytes = encoding.GetBytes("<?");
         hash.TransformBlock(bytes, 0, bytes.Length, bytes, 0);
         bytes = encoding.GetBytes(this.Name);
         hash.TransformBlock(bytes, 0, bytes.Length, bytes, 0);
         if ((this.Value != null) && (this.Value.Length > 0))
         {
             bytes = encoding.GetBytes(" " + this.Value);
             hash.TransformBlock(bytes, 0, bytes.Length, bytes, 0);
         }
         bytes = encoding.GetBytes("?>");
         hash.TransformBlock(bytes, 0, bytes.Length, bytes, 0);
         if (docPos == DocPosition.BeforeRootElement)
         {
             bytes = encoding.GetBytes("(char) 10");
             hash.TransformBlock(bytes, 0, bytes.Length, bytes, 0);
         }
     }
 }

        internal static int GetCode(
            HashAlgorithm algorithm,
            string secret,
            long counter,
            int digits)
        {
            Contract.Requires<ArgumentOutOfRangeException>(Enum.IsDefined(typeof(HashAlgorithm), algorithm));
            Contract.Requires<ArgumentOutOfRangeException>(algorithm != HashAlgorithm.Unknown);
            Contract.Requires<ArgumentNullException>(secret != null);
            Contract.Requires<ArgumentOutOfRangeException>(counter >= 0);
            Contract.Requires<ArgumentOutOfRangeException>(digits > 0);
            Contract.Ensures(Contract.Result<int>() > 0);
            Contract.Ensures(Contract.Result<int>() < Math.Pow(10, digits));

            var generator = HMAC.Create(algorithm.ToAlgorithmName());

            generator.Key = Encoding.ASCII.GetBytes(secret);
            generator.ComputeHash(CounterToBytes(counter));

            var hmac =
                generator
                .Hash
                .Select(b => Convert.ToInt32(b))
                .ToArray();

            var offset = hmac[19] & 0xF;

            var code =
                (hmac[offset + 0] & 0x7F) << 24
                | (hmac[offset + 1] & 0xFF) << 16
                | (hmac[offset + 2] & 0xFF) << 8
                | (hmac[offset + 3] & 0xFF);

            return code % (int) Math.Pow(10, digits);
        }

 /// <summary>
 /// Initializes a new StringEncryption instance.
 /// </summary>
 /// <param name="bulkCipher">The bulk cipher algorithm to use.</param>
 /// <param name="hash">The hash algorithm to use.</param>
 /// <exception cref="ArgumentNullException">One of the parameters is a null reference.</exception>
 public StringEncryption(SymmetricAlgorithm bulkCipher, HashAlgorithm hash) {
     if (bulkCipher == null)
         throw new ArgumentNullException("bulkCipher", ResourceController.GetString("Error_ParamNull"));
     if (hash == null)
         throw new ArgumentNullException("hash", ResourceController.GetString("Error_ParamNull"));
     Init(bulkCipher, hash);
 }

        private bool TestSha(HashAlgorithm alg1, HashAlgorithm alg2)
        {
            string tstStr = "This is a string that I will be getting the hash of!";

            byte[] testHash = System.Text.UTF8Encoding.UTF8.GetBytes(tstStr);

            byte[] hash1 = alg1.ComputeHash(testHash, 0, testHash.Length);
            byte[] hash2 = alg1.ComputeHash(testHash, 0, testHash.Length);
            byte[] hash3 = alg1.ComputeHash(testHash, 0, testHash.Length - 1);

            byte[] hash4 = alg2.ComputeHash(testHash);
            byte[] hash5 = alg2.ComputeHash(testHash, 0, testHash.Length - 1);

            if (hash1.Length != (alg1.HashSize/8)) throw new Exception();

            bool res1 = true, res2 = true, res3 = true, res4 = true;
            for (int i = 0; i < hash1.Length; i++)
            {
                res1 &= (hash1[i] == hash2[i]);
                res2 &= (hash1[i] == hash3[i]);
                res3 &= (hash1[i] == hash4[i]);
                res4 &= (hash3[i] == hash5[i]);
            }

            return res1 && !res2 && res3 && res4;
        }

       public static string computeHash(string password, HashAlgorithm algorithm)
        {
            Byte[] inputBytes = Encoding.UTF8.GetBytes(password);
            Byte[] hashedBytes = algorithm.ComputeHash(inputBytes);

            return BitConverter.ToString(hashedBytes);
        }

		public HashingStreamEx(Stream sBaseStream, bool bWriting, HashAlgorithm hashAlgorithm)
		{
			if(sBaseStream == null) throw new ArgumentNullException("sBaseStream");

			m_sBaseStream = sBaseStream;
			m_bWriting = bWriting;

#if !KeePassLibSD
			m_hash = (hashAlgorithm ?? new SHA256Managed());
#else // KeePassLibSD
			m_hash = null;

			try { m_hash = HashAlgorithm.Create("SHA256"); }
			catch(Exception) { }
			try { if(m_hash == null) m_hash = HashAlgorithm.Create(); }
			catch(Exception) { }
#endif
			if(m_hash == null) { Debug.Assert(false); return; }

			// Validate hash algorithm
			if(!m_hash.CanReuseTransform || !m_hash.CanTransformMultipleBlocks)
			{
				Debug.Assert(false);
				m_hash = null;
			}
		}

 public void ComputeHash(HashAlgorithm hash)
 {
     byte[] tmp = Encoding.UTF8.GetBytes (_name);
     hash.TransformBlock (tmp, 0, tmp.Length, null, 0);
     tmp = Encoding.UTF8.GetBytes (_body);
     hash.TransformBlock (tmp, 0, tmp.Length, null, 0);
 }

 /// <summary>
 /// Initializes a new instance of the <see cref="SaltedHash"/> class.
 /// </summary>
 /// <param name="hashAlgorithm">A <see cref="HashAlgorithm"/> HashAlgorihm which is derived from HashAlgorithm. C# provides
 /// the following classes: SHA1Managed,SHA256Managed, SHA384Managed, SHA512Managed and MD5CryptoServiceProvider</param>
 /// <param name="saltLength">Length of the salt.</param>
 public SaltedHash(HashAlgorithm hashAlgorithm, int saltLength)
 {
     Check.NotNull(hashAlgorithm, nameof(hashAlgorithm));
     Check.Positive(saltLength, nameof(saltLength));
     this.hashAlgorithm = hashAlgorithm;
     this.saltLength = saltLength;
 }

        /// <summary>
        /// File content hash calculation
        /// </summary>
        /// <example>
        /// <code>
        /// // Implementation of <see cref="CalculateSha256Hash"/>
        /// public static QuickIOHashResult CalculateSha256Hash( QuickIOPathInfo pathInfo )
        /// {
        ///     using ( var fs = OpenRead( pathInfo ) )
        ///     using ( var hashAlgorithm = SHA256.Create( ) )
        ///     {
        ///         return CalculateHash( hashAlgorithm, fs );
        ///     }
        /// }
        /// </code>
        /// </example>
        /// <returns><see cref="QuickIOHashResult"/></returns>
        public static QuickIOHashResult CalculateHash( HashAlgorithm hashAlgorithm, Stream stream )
        {
            Contract.Requires( hashAlgorithm != null );
            Contract.Requires( stream != null );

            return new QuickIOHashResult( hashAlgorithm.ComputeHash( stream ) );
        }

 protected int StartTests(HashAlgorithm hash, byte[] input, byte[] result)
 {
     try {
         byte[] ch = hash.ComputeHash(input, 0, input.Length);
         if (!ArrayEquals(ch, result))
             AddError("HB-ST1");
     } catch {
         AddError("HB-ST2");
     }
     try {
         // feed input byte-by-byte
         for(int i = 0; i < input.Length - 1; i++) {
             hash.TransformBlock(input, i, 1, input, i);
         }
         if (input.Length > 0)
             hash.TransformFinalBlock(input, input.Length - 1, 1);
         else
             hash.TransformFinalBlock(input, 0, 0);
         if (!ArrayEquals(hash.Hash, result)) {
             AddError("HB-ST3");
             Console.WriteLine(Encoding.ASCII.GetString(input));
         }
     } catch {
         AddError("HB-ST4");
     } finally {
         hash.Initialize();
     }
     return 4;
 }

 internal void CalculateHa1(string realm, HashAlgorithm hashAlgorithm)
 {
     Ha1 =
         Helpers.HexEncode(
             hashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(string.Format("{0}:{1}:{2}", Username, realm, _password))));
     _password = null;
 }

		/// <summary>
		/// Constructor
		/// </summary>
		/// <remarks>If <paramref name="hashAlgo"/> is an unsupported hash algorithm, then
		/// <see cref="AssemblyHashAlgorithm.SHA1"/> will be used as the hash algorithm.</remarks>
		/// <param name="hashAlgo">The algorithm to use</param>
		public AssemblyHash(AssemblyHashAlgorithm hashAlgo) {
			switch (hashAlgo) {
			case AssemblyHashAlgorithm.MD5:
				hasher = MD5.Create();
				break;

			case AssemblyHashAlgorithm.None:
			case AssemblyHashAlgorithm.MD2:
			case AssemblyHashAlgorithm.MD4:
			case AssemblyHashAlgorithm.SHA1:
			case AssemblyHashAlgorithm.MAC:
			case AssemblyHashAlgorithm.SSL3_SHAMD5:
			case AssemblyHashAlgorithm.HMAC:
			case AssemblyHashAlgorithm.TLS1PRF:
			case AssemblyHashAlgorithm.HASH_REPLACE_OWF:
			default:
				hasher = SHA1.Create();
				break;

			case AssemblyHashAlgorithm.SHA_256:
				hasher = SHA256.Create();
				break;

			case AssemblyHashAlgorithm.SHA_384:
				hasher = SHA384.Create();
				break;

			case AssemblyHashAlgorithm.SHA_512:
				hasher = SHA512.Create();
				break;
			}
		}

 /// <summary>Compute hash on input string</summary>
 /// <param name="file">The file to get hash from.</param>
 /// <param name="algorithm"> </param>
 /// <returns>The hash as a hexadecimal String.</returns>
 public static string ComputeHash(this FileInfo file, HashAlgorithm algorithm)
 {
     using (var stream = new BufferedStream(file.OpenRead(), 1024 * 8))
     {
         return ComputeHash(stream, algorithm);
     }
 }