The contract runs through the end of the 2016-17 season.
Chicago recalled Darling from Rockford of the American Hockey League earlier Sunday. In a corresponding move, the Blackhawks sent down Antti Raanta, who allowed two goals on 16 shots in 27:41 after relieving starter Corey Crawford in a 6-2 loss to the Boston Bruins on Sunday.
Darling is 5-2-0 with a 1.97 goals-against average and .937 save percentage with the Blackhawks this season. He made his NHL debut Oct. 26.
Darling, 26, is a native of Lemont, Ill., a Chicago suburb. He is 27-14-2 in 53 AHL games.
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