Decrypting the encoded password

Question

hey im trying to decrypt my password please help me with code please see my c sharp code in the zip file

Bhuvanesh Mohankumar · Answer

Create a Encrypt & Decrypt method when you pass the string it will give you the value you required. Save the Encrypted values in Database using System; using System.Text; using System.Security.Cryptography; using System.IO; using System.Linq; namespace EncryptStringSample { public static class StringCipher { //Thisconstantisusedtodeterminethekeysizeoftheencryptionalgorithminbits. //Wedividethisby8withinthecodebelowtogettheequivalentnumberofbytes. private const int Keysize=256; //Thisconstantdeterminesthenumberofiterationsforthepasswordbytesgenerationfunction. private const int DerivationIterations=1000; public static string Encrypt( string plainText string passPhrase) { //SaltandIVisrandomlygeneratedeachtimebutispreprendedtoencryptedciphertext //sothatthesameSaltandIVvaluescanbeusedwhendecrypting. varsaltStringBytes=Generate256BitsOfRandomEntropy(); varivStringBytes=Generate256BitsOfRandomEntropy(); varplainTextBytes=Encoding.UTF8.GetBytes(plainText); using (varpassword= new Rfc2898DeriveBytes(passPhrasesaltStringBytesDerivationIterations)) { varkeyBytes=password.GetBytes(Keysize/8); using (varsymmetricKey= new RijndaelManaged()) { symmetricKey.BlockSize=256; symmetricKey.Mode=CipherMode.CBC; symmetricKey.Padding=PaddingMode.PKCS7; using (varencryptor=symmetricKey.CreateEncryptor(keyBytesivStringBytes)) { using (varmemoryStream= new MemoryStream()) { using (varcryptoStream= new CryptoStream(memoryStreamencryptorCryptoStreamMode.Write)) { cryptoStream.Write(plainTextBytes0plainTextBytes.Length); cryptoStream.FlushFinalBlock(); //Createthefinalbytesasaconcatenationoftherandomsaltbytestherandomivbytesandthecipherbytes. varcipherTextBytes=saltStringBytes; cipherTextBytes=cipherTextBytes.Concat(ivStringBytes).ToArray(); cipherTextBytes=cipherTextBytes.Concat(memoryStream.ToArray()).ToArray(); memoryStream.Close(); cryptoStream.Close(); return Convert.ToBase64String(cipherTextBytes); } } } } } } public static string Decrypt( string cipherText string passPhrase) { //Getthecompletestreamofbytesthatrepresent: //[32bytesofSalt]+[32bytesofIV]+[nbytesofCipherText] varcipherTextBytesWithSaltAndIv=Convert.FromBase64String(cipherText); //Getthesaltbytesbyextractingthefirst32bytesfromthesuppliedcipherTextbytes. varsaltStringBytes=cipherTextBytesWithSaltAndIv.Take(Keysize/8).ToArray(); //GettheIVbytesbyextractingthenext32bytesfromthesuppliedcipherTextbytes. varivStringBytes=cipherTextBytesWithSaltAndIv.Skip(Keysize/8).Take(Keysize/8).ToArray(); //Gettheactualciphertextbytesbyremovingthefirst64bytesfromthecipherTextstring. varcipherTextBytes=cipherTextBytesWithSaltAndIv.Skip((Keysize/8)*2).Take(cipherTextBytesWithSaltAndIv.Length-((Keysize/8)*2)).ToArray(); using (varpassword= new Rfc2898DeriveBytes(passPhrasesaltStringBytesDerivationIterations)) { varkeyBytes=password.GetBytes(Keysize/8); using (varsymmetricKey= new RijndaelManaged()) { symmetricKey.BlockSize=256; symmetricKey.Mode=CipherMode.CBC; symmetricKey.Padding=PaddingMode.PKCS7; using (vardecryptor=symmetricKey.CreateDecryptor(keyBytesivStringBytes)) { using (varmemoryStream= new MemoryStream(cipherTextBytes)) { using (varcryptoStream= new CryptoStream(memoryStreamdecryptorCryptoStreamMode.Read)) { varplainTextBytes= new byte [cipherTextBytes.Length]; vardecryptedByteCount=cryptoStream.Read(plainTextBytes0plainTextBytes.Length); memoryStream.Close(); cryptoStream.Close(); return Encoding.UTF8.GetString(plainTextBytes0decryptedByteCount); } } } } } } private static byte []Generate256BitsOfRandomEntropy() { varrandomBytes= new byte [32]; //32Byteswillgiveus256bits. using (varrngCsp= new RNGCryptoServiceProvider()) { //Fillthearraywithcryptographicallysecurerandombytes. rngCsp.GetBytes(randomBytes); } return randomBytes; } } } Mark as answer if helpful.