(spki_principal_add_keyspki_principal_add_md5,
spki_principal_add_sha1): Initialize alias field.
(HASH_MATCH): New macro.
(spki_principal_fix_aliases): New function.
(spki_principal_by_key): Setup alias pointers if we add a key for
which a hash is already known.
(spki_principal_free_chain): New function.
(spki_5_tuple_init): New function.
(spki_5_tuple_fix_aliases): New function.
(spki_acl_parse): Call spki_5_tuple_fix_aliases before returning.
(format_valid, spki_acl_format): New functions.
(spki_process_sequence_no_signatures): Bug fix in looping over the
sequence. Call spki_5_tuple_fix_aliases before returning.
(spki_date_since_ever): Represent a time far ago.
(spki_date_for_ever): Represent a time far into the future.

* certificate.h (struct spki_principal): New field, alias.
(spki_date_since_ever, spki_date_for_ever): New constant globals.
(SPKI_DATE_CMP): New macro.

Rev: src/spki/certificate.c:1.17
Rev: src/spki/certificate.h:1.16