Encrypt and Decrypt the Password in MVC. When create user name & password functionality to software the most useful for encrypt & decrypt password.

Encrypt:-

public string Encrypt(string password)
        {
            // byte array representation of that string
            byte[] encodedPassword = new UTF8Encoding().GetBytes(password);

            // need MD5 to calculate the hash
            byte[] hash = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(encodedPassword);

            // string representation (similar to UNIX format)
            string encoded = BitConverter.ToString(hash)
               .Replace("-", string.Empty)
                // make lowercase
               .ToLower();
            return encoded;
        }

Decrypt:-

public string Decrypt(string password, string hash1)
        {
            string source = "01cfcd4f6b8770febfb40cb906715822";// "Hello World!";
            MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(source);
            byte[] hash = md5.ComputeHash(inputBytes);

            // step 2, convert byte array to hex string
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hash.Length; i++)
            {
                sb.Append(hash[i].ToString("X2"));
            }
            return sb.ToString();
        }

Get Md5 Hash:-

static string GetMd5Hash(MD5 md5Hash, string input)
        {

            // Convert the input string to a byte array and compute the hash.
            byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            // Return the hexadecimal string.
            return sBuilder.ToString();
        }

2020-01-31

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