Dear Crypto++ users,
I am working on a solution which included encryption of files of arbitrary
size (at least up to 2 GB) to be encrypted with AES CCM and uploaded to a
server.
The files would need to be encrypted by blocks when uploading not to impose
a file size limit. Total size of the file can be queries before encrypting
the data.
The examples on this mailing list and Crypto++ wiki only show hot to
encrypt the complete message in one call. Examples of AES CCM encryption
with OpenSSL are similar in that respect.
Is it valid to encrypt large input plaintext (without AAD) block by block
like this (pseudo code)?
CCM< AES, 8 >::Encryption e;
e.SetKeyWithIV( key, key.size(), iv, sizeof(iv) );
e.SpecifyDataLengths( 0, filesize, 0 );
std::string cipheblock;
AuthenticatedEncryptionFilter ef( e,
new StringSink( cipherblock )
); // AuthenticatedEncryptionFilter
do {
std::string pdata;
// read block of pdata here
ef.ChannelPut( DEFAULT_CHANNEL, pdata.data(), pdata.size() );
ef.ChannelMessageEnd(DEFAULT_CHANNEL);
// upload cipherblock
cipherblock.clear();
}
ef.MessageEnd();
// upload last cipherblock
Thank you very much for clarification.
Best regards,
Matej
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