Comment # 1 on bug 1200893 from Dr. Werner Fink

The test is not valid as the file(1) command can return anything as the
testfile below .private is encrypted without a magic byte sequence. In my case
I see

 file .private/testfile
 .private/testfile: Atari DEGAS Elite bitmap 320 x 200 x 16, color palette 0000
0000 0006 9725 00ab ...

which can not be true.  The expected value at


https://confluence.suse.com/pages/viewpage.action?pageId=968033193#SLES15SP4SecurityFIPSRegressionTest(RCphase)-SLE15SP4FIPSRegressionTest(RC,aarch64

is simply a fully random chance and depends on the version of the file package.
 Do use the file(1) command only and only if the encypted result has a magic
byte in the very first few starting bytes. AFAIK this is not the case for
ecryptfs.