On Thu, Aug 11, 2016, William King wrote: > > > Does the BIO_seek() not handle incrementing or decrementing the IV > counter? is there a callback that needs to be set to calculate what the > IV counter value should be for a given file position for the cipher? > Calling BIO_seek() on a chain of BIOs can have unpredictable results especially if any buffer data or have internal state. I'd suggest you use the cipher directly instead of through a cipher BIO. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org
