Of course I have, repeatedly, and you yourself can find it with a few simple google strokes.
But hey, I fully understand the silly game you people like to play on this, pretending that the Confederate declaration of war was not really a "declaration of war", since it said something slightly different.
But what it does say matches closely President Roosevelt's declaration language on December 8, 1861.
But more to the point: the Confederate declaration of war on May 6, 1861 provided all the legalities necessary for war that any other similar declaration provides.
Indeed, your argument here is identical to saying that when these days, Congress issues an "authorization for use of force", that amounts to something different than a full-throated declaration of war.
It doesn't. War is war, regardless of the bureaucratic paperwork used to authorize it.
Finally, if my words here don't convince you, then you can easily convince yourself by asking this question: what additional authorization to fight Civil War did Jefferson Davis need beyond the declaration of war passed on May 6, 1861?
The answer is "none", of course.
It was a declaration of war against the United States, and sealed the Confederacy's fate: unconditional secession.
Ow! December 8, 1941!!