import crack.crypt.ssl EVP_aes_256_cbc, EncryptWriter;
backing := (cwd/'outfile').writer();
out := EncryptWriter(EVP_aes_256_cbc(), key, backing);
for (data := src.read(1024))
out.close(); # You must explicitly close (or make them go out of scope).
There were a few ciphers (specifically the AES CCM and GCM ciphers) that didn't pass a round-trip test. These require some special setup that I don't feel motivated to figure out.