The New Zealand Rugby Union (NZRU) has re-signed All Blacks and Highlanders half-back Aaron Smith for the next four years.

Smith's new deal will see him through to the end of the 2019 season.

Rugby World Cup hopeful Smith has 41 international Tests to his name since debuting for the All Blacks in 2012.

The 26-year-old also helped the Highlanders to their maiden Super Rugby title this year.

"I'm really excited and thankful for the commitment shown from New Zealand Rugby, including the Highlanders and Manawatu Turbos," Smith said.

"Knowing I'm contracted for the next four years allows me to focus on my rugby and there are some exciting challenges ahead for the All Blacks which I hope to be part of.

"Dunedin is my home and I wouldn't want to play my Super Rugby anywhere else; the Highlanders brotherhood is something pretty special and I can't wait for next season."

Smith joins All Blacks team-mates Julian Savea, Brodie Retallick and Dane Coles in signing four-year deals in 2015.