Laedit.Security.Cryptography.Hash

using System;
using System.Security.Cryptography;
using System.Text;

namespace Laedit.Security.Cryptography
{
    /// <summary>
    /// Provides methods to get or check the hash of a string
    /// </summary>
    public class Hash
    {
        /// <summary>
        /// Hasj type
        /// </summary>
        public enum HashType
        {
            /// <summary>
            /// md5
            /// </summary>
            MD5,
            /// <summary>
            /// sha1
            /// </summary>
            SHA1,
            /// <summary>
            /// sha256
            /// </summary>
            SHA256,
            /// <summary>
            /// sha512
            /// </summary>
            SHA512
        }

/// <summary>
        /// Gets the hash.
        /// </summary>
        /// <param name="text">The text.</param>
        /// <param name="hashType">Type of the hash.</param>
        /// <returns>The hash from the string</returns>
        public static string GetHash(string text, HashType hashType)
        {
            HashAlgorithm _algorithm;
            switch (hashType)
            {
                case HashType.MD5:
                    _algorithm = MD5.Create();
                    break;
                case HashType.SHA1:
                    _algorithm = SHA1.Create();
                    break;
                case HashType.SHA256:
                    _algorithm = SHA256.Create();
                    break;
                case HashType.SHA512:
                    _algorithm = SHA512.Create();
                    break;
                default:
                    throw new ArgumentException("Invalid hash type", "hashType");
            }
            byte[] bytes = Encoding.Unicode.GetBytes(text);
            byte[] hash = _algorithm.ComputeHash(bytes);

return Laedit.Convert.BytesToHexadecimalString(hash);
        }

/// <summary>
        /// Checks the hash.
        /// </summary>
        /// <param name="original">The original.</param>
        /// <param name="hashString">The hash string.</param>
        /// <param name="hashType">Type of the hash.</param>
        /// <returns>True if the hash is valid; Otherwise false.</returns>
        public static bool CheckHash(string original, string hashString, HashType hashType)
        {
            string originalHash = GetHash(original, hashType);
            return (originalHash == hashString);
        }
    }
}