Hello Anthony, thank you for you fast reply. I visited your blog and analyzed your example. There is one question left. You added the comment "Call when needed" to your function EVP_EncryptUpdate(). What does that mean? In my case I want to encrypt a string containing 292 bytes. After calling EVP_EncryptUpdate_ex() the variable out_len = 288. Do I have to call EVP_EncryptUpdate_ex() again to encrypt the remaining 4 bytes? I thought the remaining bytes will be encrypted by calling EVP_EncryptFinal_ex()
Rudy1 Anthony Gabrielson-4 wrote: > > Hello, > This seems to be a pretty typical question that gets posted often. I have > a simple example that I think hits it. Anyway, its the first entry into a > blog that I'm starting to building up. If your interested the code and (a > brief) explanation is available here: > > http://agabrielson.wordpress.com/2010/07/15/openssl-an-example-from-the-command-line/#more-4 > > > One note - I didn't use the ex function; I used the older version. It > should give you a slightly easier place to start from. > > Anthony > > ----- Original Message ----- > From: "Rudy1" <r...@compumatica.eu> > To: openssl-users@openssl.org > Sent: Thursday, July 15, 2010 5:37:38 AM > Subject: AES128 CBC > > I'm using the openssl crypto lib first time and I don't know how to > encrypt text larger than blocksize (16 byte) . For example I want to > encrypt a string of size 292 bytes. I call EVP_EncryptUpdate () one time > and 288 bytes will be encrypted and finally I call EVP_EncryptFinal_ex(). > Do I really encrypt the whole string correctly? Or do I have to call > EVP_EncryptUpdate () for every blocksize chunk of my string? How large is > the encrypted string? I would expect 304 bytes (288 + 16). Is this > correct? Rudy1 > > View this message in context: AES128 CBC > Sent from the OpenSSL - User mailing list archive at Nabble.com. > > -- View this message in context: http://old.nabble.com/AES128-CBC-tp29170995p29180726.html Sent from the OpenSSL - User mailing list archive at Nabble.com. ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
