Convert clearkey to hexa

[tere1579]

hello, how can I convert these clearkeys to hexa, when converting it from base64 to hex it does not accept characters such as , - _ :

which one should I replace with in order to convert them to hexa correctly

{"keys":[{"kty":"oct","k":"gTJACVEd4_8h6Q5S34CAdg","kid":"-qGVMAlCVmiFexrqS-takg"}],"type":"temporary"}

this is the same clearkey

{"auth":"gTJ+CVEd4_:h6Q5S34C+dg","gen":",qGVM-lCVmiFexrqS,takg"}

[ElCap]

gTJACVEd4_8h6Q5S34CAdg is base64url encoded
Replace '_' with '/' and replace '-' with '+' and add some padding characters '=' so that it is a multiple of 4.
ie.
Base64url: gTJACVEd4_8h6Q5S34CAdg
Base64: gTJACVEd4/8h6Q5S34CAdg==
Hex: 81324009511DE3FF21E90E52DF808076

[tere1579]

gTJACVEd4_8h6Q5S34CAdg is base64url encoded
Replace '_' with '/' and replace '-' with '+' and add some padding characters '=' so that it is a multiple of 4.
ie.
Base64url: gTJACVEd4_8h6Q5S34CAdg
Base64: gTJACVEd4/8h6Q5S34CAdg==
Hex: 81324009511DE3FF21E90E52DF808076

thank you very much it helped me, in the case of ' : ' and ' , ' what symbols should I replace with, for example in this key

{"auth":"gTJ+CVEd4_:h6Q5S34C+dg","gen":",qGVM-lCVmiFexrqS,takg"}