upstream: Add experimental support for PQC XMSS keys (Extended

Hash-Based Signatures) The code is not compiled in by default (see WITH_XMSS
in Makefile.inc) Joint work with stefan-lukas_gazdag at genua.eu See
https://tools.ietf.org/html/draft-irtf-cfrg-xmss-hash-based-signatures-12 ok
djm@

OpenBSD-Commit-ID: ef3eccb96762a5d6f135d7daeef608df7776a7ac

1 files changed, 56 insertions, 0 deletions

diff --git a/sshkey-xmss.h b/sshkey-xmss.h
new file mode 100644
index 000000000..b9f8ead10
--- /dev/null
+++ b/sshkey-xmss.h
@@ -0,0 +1,56 @@
+/* $OpenBSD: sshkey-xmss.h,v 1.1 2018/02/23 15:58:38 markus Exp $ */
+/*
+ * Copyright (c) 2017 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef SSHKEY_XMSS_H
+#define SSHKEY_XMSS_H
+
+#define XMSS_SHA2_256_W16_H10_NAME "XMSS_SHA2-256_W16_H10"
+#define XMSS_SHA2_256_W16_H16_NAME "XMSS_SHA2-256_W16_H16"
+#define XMSS_SHA2_256_W16_H20_NAME "XMSS_SHA2-256_W16_H20"
+#define XMSS_DEFAULT_NAME          XMSS_SHA2_256_W16_H10_NAME
+
+size_t   sshkey_xmss_pklen(const struct sshkey *);
+size_t   sshkey_xmss_sklen(const struct sshkey *);
+int      sshkey_xmss_init(struct sshkey *, const char *);
+void     sshkey_xmss_free_state(struct sshkey *);
+int      sshkey_xmss_generate_private_key(struct sshkey *, u_int);
+int      sshkey_xmss_serialize_state(const struct sshkey *, struct sshbuf *);
+int      sshkey_xmss_serialize_state_opt(const struct sshkey *, struct sshbuf *,
+            enum sshkey_serialize_rep);
+int      sshkey_xmss_serialize_pk_info(const struct sshkey *, struct sshbuf *,
+            enum sshkey_serialize_rep);
+int      sshkey_xmss_deserialize_state(struct sshkey *, struct sshbuf *);
+int      sshkey_xmss_deserialize_state_opt(struct sshkey *, struct sshbuf *);
+int      sshkey_xmss_deserialize_pk_info(struct sshkey *, struct sshbuf *);
+
+int      sshkey_xmss_siglen(const struct sshkey *, size_t *);
+void    *sshkey_xmss_params(const struct sshkey *);
+void    *sshkey_xmss_bds_state(const struct sshkey *);
+int      sshkey_xmss_get_state(const struct sshkey *, sshkey_printfn *);
+int      sshkey_xmss_enable_maxsign(struct sshkey *, u_int32_t);
+int      sshkey_xmss_forward_state(const struct sshkey *, u_int32_t);
+int      sshkey_xmss_update_state(const struct sshkey *, sshkey_printfn *);
+u_int32_t sshkey_xmss_signatures_left(const struct sshkey *);
+
+#endif /* SSHKEY_XMSS_H */