Make sure you download from an official Kali Linux mirror.
For more information see the documentation.

The latest hashes can be found here: http://cdimage.kali.org/current/.
These are all SHA-256 hashes.

Kali Linux Rolling 2017.1
Code:
49b1c5769b909220060dc4c0e11ae09d97a270a80d259e05773101df62e11e9d  kali-linux-2017.1-amd64.iso
501b3747e5ac7c698217392fe49ec21dacee277404500fc49d4a0ee82625aabe  kali-linux-2017.1-i386.iso

ae293cf679f38a4f17d090a272ccb13d7619e66d4502374154186c12891fb99c  kali-linux-e17-2017.1-amd64.iso
839741fec378114ff068df3ec2dbed9d8e4fae613e690d50b25ce9cc1468104b  kali-linux-kde-2017.1-amd64.iso
35eae65aaaabba8188dfd963e45b7b4d76e0684e7721c7d232cf18320b7cae3b  kali-linux-lxde-2017.1-amd64.iso
3ea748aa8c5f50d80f020acdbca5f0398ee90242bb4413c12985e1865186ca9e  kali-linux-mate-2017.1-amd64.iso
8a17c2f54850585760b9d32a22e26df9a28f395b401753fa0a9b298aef4c4593  kali-linux-xfce-2017.1-amd64.iso

5c0f6300bf9842b724df92cb20e4637f4561ffc03029cdcb21af3902442ae9b0  kali-linux-light-2017.1-amd64.iso
6c83101ecf8702c7d93d32562e822b639d5c577314b448e3b8330995e0f07e0f  kali-linux-light-2017.1-i386.iso

7893e206be348a2101b629d38317e667130c3dc75f46af1b0930d52f1c29076f  kali-linux-light-2017.1-armel.img.xz
cda7a4ef4ff52524f06ebb8a3aea815f7df0dbcf27a7d501141f6f0fdf726ccd  kali-linux-light-2017.1-armhf.img.xz