Encryption And Decryption in asp.net c#

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hello i am using this code to Encrypt and Decrypt password but giving error in decrypt Portion "invalid length for a base-64 char array or string" on line "byte[] cipherBytes = Convert.FromBase64String(cipherText);".

C#

private string Encrypt(string clearText)
    {
        string EncryptionKey = "MAKV2SPBNI99212";
        byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(clearBytes, 0, clearBytes.Length);
                    cs.Close();
                }
                clearText = Convert.ToBase64String(ms.ToArray());
            }
        }
        return clearText;
    }

    private string Decrypt(string cipherText)
    {
        string EncryptionKey = "MAKV2SPBNI99212";
        byte[] cipherBytes = Convert.FromBase64String(cipherText);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(cipherBytes, 0, cipherBytes.Length);
                    cs.Close();
                }
                cipherText = Encoding.Unicode.GetString(ms.ToArray());
            }
        }
        return cipherText;
    }

please help...........

Posted 16-Oct-14 21:28pm

Member 11014751

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Comments

CPallini 17-Oct-14 3:34am

The posted code doesn't show how to use the methods.

Member 11014751 17-Oct-14 3:49am

Com.Parameters.AddWithValue("@Password", Decrypt(Login1.Password));

Member 11014751 17-Oct-14 4:16am

please help

Member 11014751 21-Oct-14 7:01am

problem Still not Solved it is giving error "invalid length for a base-64 char array or string"

2 solutions

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MukeshSagar · Answer 1 · 2014-10-16T23:57:00

Solution 1

Refer the link for the solution:

http://stackoverflow.com/questions/16858718/encryption-failing-with-error-invalid-length-for-a-base-64-char-array-or-string[^]

Posted 16-Oct-14 23:57pm

MukeshSagar

Comments

Member 11014751 21-Oct-14 7:00am

problem Still not Solved it is giving error "invalid length for a base-64 char array or string"

/\jmot · Answer 2 · 2014-10-17T00:39:00

Solution 2

C#

string strKey = "12345@password.com";
try
{
string strEncrypt = Encrypt(strKey); //Encrypt1(HttpUtility.UrlEncode(strKey));
string strDecrypt = Decrypt(strEncrypt);//Decrypt1(HttpUtility.UrlDecode(strEncrypt));
 if (strEncrypt == strDecrypt)
{
 Response.Write("String Matched");
}
else
 {
 Response.Write("String Not  Matched");
}
}
 catch(Exception e1)
{
}

Result Set::

C#

strKey = "12345@password.com";
strEncrypt="Encrypted String";
strDecrypt="12345@password.com";

If facing Problem With the StringKey code..then try this.

Encrypt(HttpUtility.UrlEncode(strKey));
Decrypt(HttpUtility.UrlDecode(strEncrypt));

Posted 17-Oct-14 0:39am

/\jmot

Updated 17-Oct-14 0:41am

v2

Comments

Member 11014751 21-Oct-14 7:00am

problem Still not Solved it is giving error "invalid length for a base-64 char array or string"

/\jmot 21-Oct-14 7:23am

i think you are trying to decrypt the code strkry="12345@passsword.com"??
try to decrypt the encrypted code.

MukeshSagar 22-Oct-14 2:47am

No this is the key on the basis of which the data is encrypted

/\jmot 22-Oct-14 3:31am

show me...
how you are calling these method???