On Wed, Jun 01, 2011, Chenchu, Rakesh R wrote:

> Hi Stephen,
> 
> I want to understand a bit more on this padding.
> 
> Why should we have to leave padding intact here?
> 

It depends on whether the ciphertext uses padding or not, you have to be
consistent.

> Should the call EVP_CIPHER_CTX_init modified to EVP_CipherInit_ex() ?
> 

No, that's a different function.

> 
> Should we then call EVP_DecryptUpdate_ex(),EVP_DecryptFinal_ex()
> equivalent?
> 

There is no EVP_DecryptUpdate_ex but you should call EVP_DecryptFinal_ex(),
after you've finished with the context you then must call
EVP_CIPHER_CTX_cleanup().

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