Support the latest HTTP Digest authentication specification (Issue #4862)

Also deprecates all httpMD5* functions.

- cgi-bin/var.c: Use cupsHashData to compute SID hash.
- cups/auth.c: Rewrite WWW-Authenticate parser to support multiple auth schemes
  and the new RFC 7616 version of HTTP Digest.
- cups/cups.h: Add cupsHashString function to get a hex version of a hash.
- cups/hash.c: Add MD5 support.
- cups/http.c: Track WWW-Authenticate in a long string, concatenate new set
  values.
- cups/http.h: Deprecate httpMD5* and recommend cupsDoAuth and cupsHash*.
- cups/http-private.h: Pull MD5 stuff, nonce_count is unsigned, track
  WWW-Authenticate header as a potentially long string.
- cups/http-support.c: Use cupsHashData to compute UUID hash.
- cups/md5.c: Comment everything out if we have an OS-supplied MD5 hash
  function.
- cups/md5passwd.c: Use cupsHash* functions.
- cups/tls-*.c: Use cupsHash* functions.
- cups/versioning.h: Add CUPS_API_2_3 definition.
- scheduler/client.c: Update WWW-Authenticate header to include AuthRef,
  Local, and PeerCred schemes with parameters as needed.

1 files changed, 3 insertions, 0 deletions

diff --git a/cups/cups.h b/cups/cups.h
index a4eae86d9..9896f640c 100644
--- a/cups/cups.h
+++ b/cups/cups.h
@@ -606,6 +606,9 @@ extern ssize_t		cupsHashData(const char *algorithm, const void *data, size_t dat
 extern int		cupsAddIntegerOption(const char *name, int value, int num_options, cups_option_t **options) _CUPS_API_2_2_4;
 extern int		cupsGetIntegerOption(const char *name, int num_options, cups_option_t *options) _CUPS_API_2_2_4;
 
+/* New in CUPS 2.3 */
+extern const char	*cupsHashString(const unsigned char *hash, size_t hashsize, char *buffer, size_t bufsize) _CUPS_API_2_3;
+
 #  ifdef __cplusplus
 }
 #  endif /* __cplusplus */