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Mono C# Examples

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(Mono C#) JWE using PBES2 Key Wrapping

Demonstrates how to create and decrypt a JWE that using PBES2 key wrapping.

This example demonstrates PBES2 with HMAC SHA-256 and A128KW wrapping. It is also possible to do the following by simply changing the "alg" parameter:

  • PBES2 with HMAC SHA-384 and A192KW wrapping
  • PBES2 with HMAC SHA-512 and A256KW wrapping

Note: This example requires Chilkat v9.5.0.66 or greater.

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//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Note: This example requires Chilkat v9.5.0.66 or greater.

bool success;
string plaintext = "Live long and prosper.";

Chilkat.Jwe jwe = new Chilkat.Jwe();

//  First build the JWE Protected Header..
Chilkat.JsonObject jweProtHdr = new Chilkat.JsonObject();
jweProtHdr.AppendString("alg","PBES2-HS256+A128KW");
jweProtHdr.AppendString("enc","A128GCM");

//  PBES2 requires two additional parameters:
//  1) A random salt parameter ("p2s") containing 8 or more bytes in base64url format.
//  2) An iteration count parameter ("p2c").  A minimum count of 1000 is recommended.
//     The iteration count is intended to make the PBES2 computation more expensive (time consuming)
//     to prevent brute-force attacks.
Chilkat.Prng prng = new Chilkat.Prng();
jweProtHdr.AppendString("p2s",prng.GenRandom(16,"base64url"));
jweProtHdr.AppendString("p2c","1000");

Console.WriteLine("JWE Protected Header: " + jweProtHdr.Emit());
Console.WriteLine("--");

//  Don't forget to actually provide the protected header to the JWE object:
jwe.SetProtectedHeader(jweProtHdr);

//  Set the PBES2 password
int recipientIndex = 0;
jwe.SetPassword(recipientIndex,"top secret");

//  Encrypt and return the JWE:
string strJwe = jwe.Encrypt(plaintext,"utf-8");
if (jwe.LastMethodSuccess != true) {
    Console.WriteLine(jwe.LastErrorText);
    return;
}

//  Show the JWE we just created:
Console.WriteLine(strJwe);

//  Decrypt the JWE.
Chilkat.Jwe jwe2 = new Chilkat.Jwe();
success = jwe2.LoadJwe(strJwe);
if (success != true) {
    Console.WriteLine(jwe2.LastErrorText);
    return;
}

//  Set the PBES2 password
jwe2.SetPassword(recipientIndex,"top secret");

//  Decrypt.
string originalPlaintext = jwe2.Decrypt(0,"utf-8");
if (jwe2.LastMethodSuccess != true) {
    Console.WriteLine(jwe2.LastErrorText);
    return;
}

Console.WriteLine("original text: ");
Console.WriteLine(originalPlaintext);

//  Sample output:

//  JWE Protected Header: {"alg":"PBES2-HS256+A128KW","enc":"A128GCM","p2s":"z39rTEfRy1T1Yn_D1mZRlg","p2c":"1000"}
//  --
//  eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJlbmMiOiJBMTI4R0NNIiwicDJzIjoiejM5clRFZlJ5MVQxWW5fRDFtWlJsZyIsInAyYyI6IjEwMDAifQ.koYt6PrFmYwcwdcT7ZcvXHA1d-Xez5h4.luGlbvEnZp-7IsBOj42Yhw.YMTcfLf8Qe4zazozGV2OAu3cUdQ8Kg.rWub47ESWkc6IqZJTvSTmg
//  original text:
//  Live long and prosper.

 

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