pip install --upgrade binaryai
# then you can add the binaryai plugin into $IDAUSR
binaryai install_ida_plugin

import flare_emu

def decrypt(argv):
    myEH = flare_emu.EmuHelper()
    myEH.emulateRange(myEH.analysisHelper.getNameAddr("decryptString"), registers = {"arg1":argv[0], "arg2":argv[1], 
                           "arg3":argv[2], "arg4":argv[3]})
    return myEH.getEmuString(argv[0])

def iterateCallback(eh, address, argv, userData):
    s = decrypt(argv)
    print("%s: %s" % (eh.hexString(address), s))
    eh.analysisHelper.setComment(address, s, False)

if __name__ == '__main__':   
    eh = flare_emu.EmuHelper()
    eh.iterate(eh.analysisHelper.getNameAddr("decryptString"), iterateCallback)