On Feb 2, 8:58 pm, Jeffrey Walton <[email protected]> wrote:
> On Feb 2, 5:47 pm, Chirag Shah <[email protected]> wrote:> Hi Jeffery,
>
> > Thanks for your reply but i want to clarify one more thing.
> > If i have binary data buffer / file length is of i.e. 50 bytes, then
> > do i need to take care of chopping my data in 16 bytes for first three
> > Put() calls with NO_PADDING and last Put() call with padding enabled
> > OR i can simply give 50 byte buffer into Put() call with padding
> > enabled as its(50) not multiple of 16.
>
> // const size_t size = 16 * 4 + 1;
> const size_t size = 16 * 4;
> string plain(size, 0x00);
>
> for(size_t i = 0; i < size; i++)
> plain[i] = 'A' + (i%26);
>
> // cout << plain << endl;
>
> byte key[AES::DEFAULT_KEYLENGTH], iv[AES::BLOCKSIZE];
> memset(key, 0x00, sizeof(key));
> memset(iv, 0x00, sizeof(iv));
>
> CBC_Mode < AES >::Encryption aes(key, sizeof(key), iv);
> StreamTransformationFilter encryptor(
> aes, NULL, BlockPaddingSchemeDef::NO_PADDING
> );
>
> for(size_t j = 0; j < size; j++)
> encryptor.Put((byte)plain[j]);
>
> encryptor.MessageEnd();
> size_t ready = encryptor.MaxRetrievable();
>
> // cout << ready << endl;
>
> string cipher(ready, 0x00);
> encryptor.Get((byte*) &cipher[0], cipher.size());
This might also be useful to you:
size_t ready = encryptor.MaxRetrievable();
for(size_t j = 0; j < size; j++)
{
encryptor.Put((byte)plain[j]);
cout << plain[j] << ", ";
ready = encryptor.MaxRetrievable();
cout << ready << endl;
}
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