C#

AES OFB Output Feedback Mode Encryption

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Demonstrates how to encrypt using AES OFB (Output Feedback) mode. C#

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

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

crypt.CryptAlgorithm = "aes";
// Set the cipher mode to Output Feedback
crypt.CipherMode = "ofb";
crypt.KeyLength = 256;

// EncodingMode specifies the encoding of the output for
// encryption, and the input for decryption.
// It may be "hex", "url", "base64", "quoted-printable", or many other choices.
crypt.EncodingMode = "hex";

string ivHex = "000102030405060708090A0B0C0D0E0F";
crypt.SetEncodedIV(ivHex,"hex");

// The secret key must equal the size of the key.  For
// 256-bit encryption, the binary secret key is 32 bytes.
string keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4";
crypt.SetEncodedKey(keyHex,"hex");

// Encrypt a string...
string encStr = crypt.EncryptStringENC("Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. -- John Stuart Mill");
Debug.WriteLine(encStr);

Chilkat.Crypt2 decrypt = new Chilkat.Crypt2();
decrypt.CryptAlgorithm = "aes";
decrypt.CipherMode = "ofb";
decrypt.KeyLength = 256;
decrypt.EncodingMode = "hex";
decrypt.SetEncodedIV(ivHex,"hex");
decrypt.SetEncodedKey(keyHex,"hex");

// Now decrypt:
string decStr = decrypt.DecryptStringENC(encStr);
Debug.WriteLine(decStr);