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(C#) Streaming Encryption by Encrypting in ChunksEncrypt data in chunks.
// 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"; crypt.CipherMode = "cbc"; crypt.KeyLength = 128; crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex"); crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex"); crypt.EncodingMode = "hex"; string txt1 = "The quick brown fox jumped over the lazy dog.\r\n"; string txt2 = "-\r\n"; string txt3 = "Done.\r\n"; Chilkat.StringBuilder sbEncrypted = new Chilkat.StringBuilder(); // Encrypt the 1st chunk: // (don't worry about feeding the data to the encryptor in // exact multiples of the encryption algorithm's block size. // Chilkat will buffer the data.) crypt.FirstChunk = true; crypt.LastChunk = false; sbEncrypted.Append(crypt.EncryptStringENC(txt1)); // Encrypt the 2nd chunk crypt.FirstChunk = false; crypt.LastChunk = false; sbEncrypted.Append(crypt.EncryptStringENC(txt2)); // Now encrypt N more chunks... // Remember -- we're doing this in CBC mode, so each call // to the encrypt method depends on the state from previous // calls... crypt.FirstChunk = false; crypt.LastChunk = false; int i; for (i = 0; i <= 4; i++) { sbEncrypted.Append(crypt.EncryptStringENC(txt1)); sbEncrypted.Append(crypt.EncryptStringENC(txt2)); } // Now encrypt the last chunk: crypt.FirstChunk = false; crypt.LastChunk = true; sbEncrypted.Append(crypt.EncryptStringENC(txt3)); Debug.WriteLine(sbEncrypted.GetAsString()); // Now decrypt in one call. // (The data we're decrypting is both the first AND last chunk.) crypt.FirstChunk = true; crypt.LastChunk = true; string decryptedText = crypt.DecryptStringENC(sbEncrypted.GetAsString()); Debug.WriteLine(decryptedText); // Note: You may decrypt in N chunks by setting the FirstChunk // and LastChunk properties prior to calling the Decrypt* methods |
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