On Thu, May 05, 2011, Prashant Batra wrote:

> Hi,
> 
> One question regarding EVP_Encrypt APIs.
> 
> 
> EVP_EncryptInit_ex(&ctx, cipher, NULL, (unsigned char *)enc_key, (unsigned
> char *)iv))
> 
> Is there a way to pass the iv as NULL during the call to the above API, and
> then update this later on.

Yes. You set the iv parameter to NULL in the initial call and later set all
parameters apart from the context and iv to NULL.

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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