HELP How to convert clearkey to hexa

[tere1579]

Hello, I'm new to this, I'm starting, I would like to know how to convert a clearkey to hexa

example I have this which

{"keys": [{"k":"9B3NW7ERtuvJVZdB2Yt7gQ" , "kty":"oct" , "kid":"QKqKNGf8V5Cld5ohkItKdQ"}] , "type":"temporary"}

is equal to this

key": "40aa8a3467fc5790a5779a21908b4a75:f41dcd5bb111b6ebc9559741d98b7b81"

but I don't know how to convert it to hexa

[ElCap]

Convert kid and k from base64 to hex