Please check rsa file encryption algorithm code..and update answer.

Question

https://www.youtube.com/watch?v=HWNcfxUadUs I am trying to create this project given in link and above posted code of rsa file encryption algorithm please check code i have done using rsa crypto provider...is it correct way or not??Please check... yes or no..If no then what is the correct code? in asp.net c# webforms.

 

 

//RSAencrypt function

public bool RSAencryptfile(string filename)

{

FileStream f;

try

{

f = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);

}

catch (Exception e)

{

throw e;

//return false;

}

Random r = new Random();

Thread.Sleep(10 * r.Next(3, 8));

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);

rsa.FromXmlString("<RSAKeyValue><Modulus>21wEnTU+mcD2w0Lfo1Gv4rtcSWsQJQTNa6gio05AOkV/Er9w3Y13Ddo5wGtjJ19402S71HUeN0vbKILLJdRSES5MHSdJPSVrOqdrll/vLXxDxWs/U0UT1c8u6k/Ogx9hTtZxYwoeYqdhDblof3E75d9n2F0Zvf6iTb4cI7j6fMs=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>");

// Import key

byte[] data = new byte[16];

ArrayList con = new ArrayList();

while (f.Read(data, 0, 16) != 0)

{

byte[] result = rsa.Encrypt(data, false);

//Thread.Sleep(10 * r.Next(2, 7));

con.Add(result);

}

// encryption

f.Seek(0, SeekOrigin.Begin);

foreach (byte[] d in con)

{

f.Write(d, 0, d.Length);

}

f.Close();

return true;

}

//RSAdecrypt function

public bool RSAdecryptFile(string filename, string key)

{

FileStream f;

try

{

f = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);

}

catch

{

return false;

}

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);

try

{

rsa.FromXmlString(key);

}

catch

{

return false;

}

byte[] data = new byte[128];

ArrayList con = new ArrayList();

while (f.Read(data, 0, 128) != 0)

{

byte[] result;

try

{

result = rsa.Decrypt(data, false);

}

catch (Exception e)

{

throw e;

//return false;

}

con.Add(result);

}

// decryption

f.SetLength(con.Count * 16);

f.Seek(0, SeekOrigin.Begin);

foreach (byte[] d in con)

{

f.Write(d, 0, d.Length);

}

f.Close();

return true;

}

//In aspx.cs

string privatekey = "<RSAKeyValue><Modulus>21wEnTU+mcD2w0Lfo1Gv4rtcSWsQJQTNa6gio05AOkV/Er9w3Y13Ddo5wGtjJ19402S71HUeN0vbKILLJdRSES5MHSdJPSVrOqdrll/vLXxDxWs/U0UT1c8u6k/Ogx9hTtZxYwoeYqdhDblof3E75d9n2F0Zvf6iTb4cI7j6fMs=</Modulus><Exponent>AQAB</Exponent><P>/aULPE6jd5IkwtWXmReyMUhmI/nfwfkQSyl7tsg2PKdpcxk4mpPZUdEQhHQLvE84w2DhTyYkPHCtq/mMKE3MHw==</P><Q>3WV46X9Arg2l9cxb67KVlNVXyCqc/w+LWt/tbhLJvV2xCF/0rWKPsBJ9MC6cquaqNPxWWEav8RAVbmmGrJt51Q==</Q><DP>8TuZFgBMpBoQcGUoS2goB4st6aVq1FcG0hVgHhUI0GMAfYFNPmbDV3cY2IBt8Oj/uYJYhyhlaj5YTqmGTYbATQ==</DP><DQ>FIoVbZQgrAUYIHWVEYi/187zFd7eMct/Yi7kGBImJStMATrluDAspGkStCWe4zwDDmdam1XzfKnBUzz3AYxrAQ==</DQ><InverseQ>QPU3Tmt8nznSgYZ+5jUo9E0SfjiTu435ihANiHqqjasaUNvOHKumqzuBZ8NRtkUhS6dsOEb8A2ODvy7KswUxyA==</InverseQ><D>cgoRoAUpSVfHMdYXW9nA3dfX75dIamZnwPtFHq80ttagbIe4ToYYCcyUz5NElhiNQSESgS5uCgNWqWXt5PnPu4XmCXx6utco1UVH8HGLahzbAnSy6Cj3iUIQ7Gj+9gQ7PkC434HTtHazmxVgIR5l56ZjoQ8yGNCPZnsdYEmhJWk=</D></RSAKeyValue>";