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+/* $OpenBSD: cipher.h,v 1.52 2017/05/07 23:12:57 djm Exp $ */
+
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ * Copyright (c) 2000 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 CIPHER_H
+#define CIPHER_H
+
+#include <sys/types.h>
+#include <openssl/evp.h>
+#include "cipher-chachapoly.h"
+#include "cipher-aesctr.h"
+
+#define CIPHER_ENCRYPT 1
+#define CIPHER_DECRYPT 0
+
+struct sshcipher;
+struct sshcipher_ctx;
+
+const struct sshcipher *cipher_by_name(const char *);
+const char *cipher_warning_message(const struct sshcipher_ctx *);
+int ciphers_valid(const char *);
+char *cipher_alg_list(char, int);
+int cipher_init(struct sshcipher_ctx **, const struct sshcipher *,
+ const u_char *, u_int, const u_char *, u_int, int);
+int cipher_crypt(struct sshcipher_ctx *, u_int, u_char *, const u_char *,
+ u_int, u_int, u_int);
+int cipher_get_length(struct sshcipher_ctx *, u_int *, u_int,
+ const u_char *, u_int);
+void cipher_free(struct sshcipher_ctx *);
+u_int cipher_blocksize(const struct sshcipher *);
+u_int cipher_keylen(const struct sshcipher *);
+u_int cipher_seclen(const struct sshcipher *);
+u_int cipher_authlen(const struct sshcipher *);
+u_int cipher_ivlen(const struct sshcipher *);
+u_int cipher_is_cbc(const struct sshcipher *);
+
+u_int cipher_ctx_is_plaintext(struct sshcipher_ctx *);
+
+int cipher_get_keyiv(struct sshcipher_ctx *, u_char *, size_t);
+int cipher_set_keyiv(struct sshcipher_ctx *, const u_char *, size_t);
+int cipher_get_keyiv_len(const struct sshcipher_ctx *);
+
+#endif /* CIPHER_H */