[openssl-users] What is the need for 0x00 byte prefix in pubkey and prime of a static DH key pair?

[Matt Caswell]

On 30/11/2018 05:26, M K Saravanan wrote:
> Hi,
> 
> When I create static DH key pair using openssl, why the public key and
> prime contains the prefix 0x00 byte?

Because otherwise those numbers would be treated as negative (due to the most
significant bit being set) which is incorrect.

Matt