Fix user_data_encrypt to UTF8 decode before print

Reproducible on Ubuntu 20.04 (Python 3.8.5)

$ keylime_userdata_encrypt secret.bin
Writing keys to content_keys.txt
Traceback (most recent call last):
File "/usr/local/bin/keylime_userdata_encrypt", line 8, in
sys.exit(main())
File "/home/ens/.local/lib/python3.8/site-packages/keylime/cmd/user_data_encrypt.py", line 53, in main
f.write(base64.b64encode(ret['k']))
TypeError: write() argument must be str, not bytes

Patch from Ilhan Gurel ([email protected])

Signed-off-by: Michael Peters <[email protected]>

keylime/cmd/user_data_encrypt.py

@@ -50,17 +50,17 @@ def main(argv=sys.argv):
 
     print("Writing keys to content_keys.txt")
     f = open('content_keys.txt', 'w')
-    f.write(base64.b64encode(ret['k']))
+    f.write(base64.b64encode(ret['k'].decode('utf-8')))
     f.write('\n')
-    f.write(base64.b64encode(ret['v']))
+    f.write(base64.b64encode(ret['v'].decode('utf-8')))
     f.write('\n')
-    f.write(base64.b64encode(ret['u']))
+    f.write(base64.b64encode(ret['u'].decode('utf-8')))
     f.write('\n')
     f.close()
 
     print("Writing encrypted data to content_payload.txt")
     f = open('content_payload.txt', 'w')
-    f.write(ret['ciphertext'])
+    f.write(ret['ciphertext'].decode('utf-8'))
     f.close()