bug#37758: 27.0.50; Support multibyte characters in function 'auth-source--pad'an; with patch

[mgcyung <mgcyung@gmail.com>]

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'auth-source--pad' use 'length' to get byte length of a
string. However, 'length' return the number of characters which is not
the byte length with multibyte characters such as Chinese
character. This may causes an error "GnuTLS cipher
AES-256-CBC/encrypt input block length xxxx is not a multiple of the
required 16".

According to the doc of 'length'. 'length' can be replaced by
'string-bytes'. And a patch is attached.


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diff --git a/lisp/auth-source.el b/lisp/auth-source.el
index 9061d41556..80559b8f47 100644
--- a/lisp/auth-source.el
+++ b/lisp/auth-source.el
@@ -1190,13 +1190,13 @@ FILE is the file from which we obtained this token."
 
 (defun auth-source--pad (string length)
   "Pad string S to a modulo of LENGTH."
-  (let ((pad (- length (mod (length string) length))))
+  (let ((pad (- length (mod (string-bytes string) length))))
     (concat string (make-string pad pad))))
 
 (defun auth-source--unpad (string)
   "Remove PKCS#7 padding from STRING."
-  (substring string 0 (- (length string)
-			 (aref string (1- (length string))))))
+  (substring string 0 (- (string-bytes string)
+			 (aref string (1- (string-bytes string))))))
 
 (defun auth-source--deobfuscate (data)
   (if (and (fboundp 'gnutls-symmetric-encrypt)

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