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+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * 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.
+ * 3. Neither the name of the project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * RFC1827/2406 Encapsulated Security Payload.
+ */
+
+#ifndef _NETINET6_ESP_H_
+#define _NETINET6_ESP_H_
+
+struct secasvar;
+
+struct esp {
+ u_int32_t esp_spi; /* ESP */
+ /*variable size, 32bit bound*/ /* Initialization Vector */
+ /*variable size*/ /* Payload data */
+ /*variable size*/ /* padding */
+ /*8bit*/ /* pad size */
+ /*8bit*/ /* next header */
+ /*8bit*/ /* next header */
+ /*variable size, 32bit bound*/ /* Authentication data (new IPsec) */
+};
+
+struct newesp {
+ u_int32_t esp_spi; /* ESP */
+ u_int32_t esp_seq; /* Sequence number */
+ /*variable size*/ /* (IV and) Payload data */
+ /*variable size*/ /* padding */
+ /*8bit*/ /* pad size */
+ /*8bit*/ /* next header */
+ /*8bit*/ /* next header */
+ /*variable size, 32bit bound*/ /* Authentication data */
+};
+
+struct esptail {
+ u_int8_t esp_padlen; /* pad length */
+ u_int8_t esp_nxt; /* Next header */
+ /*variable size, 32bit bound*/ /* Authentication data (new IPsec)*/
+};
+
+struct esp_algorithm_state {
+ struct secasvar *sav;
+ void* foo; /*per algorithm data - maybe*/
+};
+
+/* XXX yet to be defined */
+struct esp_algorithm {
+ size_t padbound; /* pad boundary, in byte */
+ int (*mature) __P((struct secasvar *));
+ int keymin; /* in bits */
+ int keymax; /* in bits */
+ int (*ivlen) __P((struct secasvar *));
+ int (*decrypt) __P((struct mbuf *, size_t,
+ struct secasvar *, struct esp_algorithm *, int));
+ int (*encrypt) __P((struct mbuf *, size_t, size_t,
+ struct secasvar *, struct esp_algorithm *, int));
+};
+
+#ifdef KERNEL
+extern struct esp_algorithm esp_algorithms[];
+
+/* crypt routines */
+extern int esp4_output __P((struct mbuf *, struct ipsecrequest *));
+extern void esp4_input __P((struct mbuf *, int, int));
+extern size_t esp_hdrsiz __P((struct ipsecrequest *));
+#endif /*KERNEL*/
+
+extern int esp_auth __P((struct mbuf *, size_t, size_t,
+ struct secasvar *, u_char *));
+
+#endif /*_NETINET6_ESP_H_*/
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