pki: Created pki --est man page

src/libstrongswan/utils/lexparser.c

@@ -36,6 +36,14 @@ bool match(const char *pattern, const chunk_t *ch)
 	return ch->len == strlen(pattern) && strncmp(pattern, ch->ptr, ch->len) == 0;
 }
 
+/**
+ * compare string with chunk ignoring the case of the characters
+ */
+bool matchcase(const char *pattern, const chunk_t *ch)
+{
+	return ch->len == strlen(pattern) && strncasecmp(pattern, ch->ptr, ch->len) == 0;
+}
+
 /**
  * extracts a token ending with the first occurrence of a given termination symbol
  */