[PATCH] cipher: fix dhgex for non-GCM ciphers for OpenSSL 3.0

[Marc Kleine-Budde]

On 12/4/20 3:36 AM, Darren Tucker wrote:
> Thanks for the investigation.
> 
>> The issue is that openssh needs the "current" IV state (which the 
>> now-deprecated EVP_CIPHER_CTX_iv() used to return), but it's calling the 
>> wrong openssl function to obtain it.
> 
> It's not that simple.
> 
> In 2018, LibreSSL added EVP_CIPHER_CTX_get_iv (
> https://github.com/libressl-portable/openbsd/commit/db321d7792) which
> returns the current IV, and OpenSSH has been using it ever since.
> 
> In 2020, OpenSSL added a function of the same name (
> https://github.com/openssl/openssl/commit/79f4417ed94) which behaves
> differently.  Maybe OpenSSL could change it before 3.0 instead of shipping
> an incompatible API?  EVP_CIPHER_CTX_get_original_iv would be consistent
> with the function they deprecated. ie
> 
> EVP_CIPHER_CTX_get_iv -> EVP_CIPHER_CTX_get_original_iv
> EVP_CIPHER_CTX_get_iv_state -> EVP_CIPHER_CTX_get_iv

I tried to wrap up the problem and created an openssl issue:

https://github.com/openssl/openssl/issues/13631

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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