+(eval-when-compile
+ (defmacro canlock-string-as-unibyte (string)
+ "Return a unibyte string with the same individual bytes as STRING."
+ (if (fboundp 'string-as-unibyte)
+ (list 'string-as-unibyte string)
+ string)))
+
+(defun canlock-sha1 (message)
+ "Make a SHA-1 digest of MESSAGE as a unibyte string of length 20 bytes."
+ (canlock-string-as-unibyte (funcall canlock-sha1-function message)))
+