diff --git a/include/types/ssl_ckch.h b/include/types/ssl_ckch.h
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+++ b/include/types/ssl_ckch.h
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+/*
+ * include/types/ssl_ckch.h
+ * ckch structures
+ *
+ * Copyright (C) 2020 HAProxy Technologies, William Lallemand <wlallemand@haproxy.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+
+/* The ckch (cert key and chain) structures are a group of structures used to
+ * cache and manipulate the certificates files loaded from the configuration
+ * file and the CLI Every certificate change made in a SSL_CTX should be done
+ * in these structures before being applied to a SSL_CTX.
+ *
+ * The complete architecture is described in doc/internals/ssl_cert.dia
+ */
+
+
+#ifndef _TYPES_SSL_CKCH_H
+#define _TYPES_SSL_CKCH_H
+#ifdef USE_OPENSSL
+
+#include <common/mini-clist.h>
+#include <common/openssl-compat.h>
+
+/* This is used to preload the certificate, private key
+ * and Cert Chain of a file passed in via the crt
+ * argument
+ *
+ * This way, we do not have to read the file multiple times
+ *
+ * This structure is the base one, in the case of a multi-cert bundle, we
+ *  allocate 1 structure per type.
+ */
+struct cert_key_and_chain {
+	X509 *cert;
+	EVP_PKEY *key;
+	STACK_OF(X509) *chain;
+	DH *dh;
+	struct buffer *sctl;
+	struct buffer *ocsp_response;
+	X509 *ocsp_issuer;
+};
+
+/*
+ * this is used to store 1 to SSL_SOCK_NUM_KEYTYPES cert_key_and_chain and
+ * metadata.
+ *
+ * XXX: Once we remove the multi-cert bundle support, we could merge this structure
+ * with the cert_key_and_chain one.
+ */
+struct ckch_store {
+	struct cert_key_and_chain *ckch;
+	unsigned int multi:1;  /* is it a multi-cert bundle ? */
+	struct list ckch_inst; /* list of ckch_inst which uses this ckch_node */
+	struct list crtlist_entry; /* list of entries which use this store */
+	struct ebmb_node node;
+	char path[0];
+};
+
+/*
+ * This structure describe a ckch instance. An instance is generated for each
+ * bind_conf.  The instance contains a linked list of the sni ctx which uses
+ * the ckch in this bind_conf.
+ */
+struct ckch_inst {
+	struct bind_conf *bind_conf; /* pointer to the bind_conf that uses this ckch_inst */
+	struct ssl_bind_conf *ssl_conf; /* pointer to the ssl_conf which is used by every sni_ctx of this inst */
+	struct ckch_store *ckch_store; /* pointer to the store used to generate this inst */
+	struct crtlist_entry *crtlist_entry; /* pointer to the crtlist_entry used, or NULL */
+	unsigned int is_default:1;      /* This instance is used as the default ctx for this bind_conf */
+	/* space for more flag there */
+	struct list sni_ctx; /* list of sni_ctx using this ckch_inst */
+	struct list by_ckchs; /* chained in ckch_store's list of ckch_inst */
+	struct list by_crtlist_entry; /* chained in crtlist_entry list of inst */
+};
+
+#endif /* USE_OPENSSL */
+#endif /* _TYPES_SSL_CKCH_H */