The NHL franchise announced the deals, which are believed to be worth $84million each, and will hold a news conference next week.
Captain Toews, 26, and Kane, 25, are both two-time Stanley Cup champions, having helped the Blackhawks to the title in 2010 and 2013.
Toews became the youngest captain in the Blackhawks' history in 2008 and third-youngest in NHL history.
He was awarded the Conn Smythe Trophy for being the play-off MVP in 2010, while Kane claimed that prize in 2013.
Toews is also a two-time Olympic champion after helping Canada win back-to-back gold medals in 2010 and 2014.
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