Hello,
On Wed, Aug 8, 2012 at 1:10 PM, exocoder
Thank you for the info Neil, I am looking at the example that you pointed to, need to get my head around the issues of initialising/closing OpenSSL in the filter. It seems that every OpenSSL example uses a different interface :(
I think the OpenSSL EVP interface is the one you want: http://www.openssl.org/docs/crypto/EVP_EncryptInit.html# Cheers, Will
Again Thank you for the advice.
On Mon, 2012-08-06 at 15:40 -0600, Neil Nelson wrote:
exocoder,
Upon just reading the docs at
http://www.boost.org/doc/libs/1_50_0/libs/iostreams/doc/index.html
and particularly
2.2.8. Multi-Character Filters
It looks like you could take the code from the following page
http://stackoverflow.com/questions/1007337/encrypting-and-decrypting-a-small...
with the critical line being
AES_cfb128_encrypt(indata, outdata, bytes_read, &key, ivec, &num, AES_ENCRYPT);
that reads and writes to memory buffers. Two other aspects are: (1) software using encryption is export restricted and you can research that if needed for your application, (2) key management is likely the more complicated part, and (3) use of initialization vectors (added random bytes at the beginning of the input data).
Neil Nelson
I am currently looking at using OpenSSL to write information to an encrypted file on-the-fly so to speak. I have been researching my options for doing this, and have come across the Boost.Iostream
library,
which promises to be a very elegant solution (The documentation even suggests that filters can be written to provide encryption/decryption using OpenSSL). It would seem that my best approach would be to use the BIO_f* interface to encrypt a memory buffer, which could be written by overloading write(). However the OpenSSL documentation is particularly sparse when it comes to file/memory encryption and I would appreciate any advice on how to do this. Thank you in advance for any help proffered.
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