/*
 * Copyright (c) 2005 Darren Tucker <dtucker@zip.com.au>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _OPENSSL_COMPAT_H
#define _OPENSSL_COMPAT_H

#include "includes.h"
#ifdef WITH_OPENSSL

#include <openssl/opensslv.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/dsa.h>
#include <openssl/ecdsa.h>
#include <openssl/dh.h>

int ssh_compatible_openssl(long, long);

#if (OPENSSL_VERSION_NUMBER <= 0x0090805fL)
# error OpenSSL 0.9.8f or greater is required
#endif

#if OPENSSL_VERSION_NUMBER < 0x10000001L
# define LIBCRYPTO_EVP_INL_TYPE unsigned int
#else
# define LIBCRYPTO_EVP_INL_TYPE size_t
#endif

#ifndef OPENSSL_RSA_MAX_MODULUS_BITS
# define OPENSSL_RSA_MAX_MODULUS_BITS	16384
#endif
#ifndef OPENSSL_DSA_MAX_MODULUS_BITS
# define OPENSSL_DSA_MAX_MODULUS_BITS	10000
#endif

#ifndef OPENSSL_HAVE_EVPCTR
# define EVP_aes_128_ctr evp_aes_128_ctr
# define EVP_aes_192_ctr evp_aes_128_ctr
# define EVP_aes_256_ctr evp_aes_128_ctr
const EVP_CIPHER *evp_aes_128_ctr(void);
void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, size_t);
#endif

/* Avoid some #ifdef. Code that uses these is unreachable without GCM */
#if !defined(OPENSSL_HAVE_EVPGCM) && !defined(EVP_CTRL_GCM_SET_IV_FIXED)
# define EVP_CTRL_GCM_SET_IV_FIXED -1
# define EVP_CTRL_GCM_IV_GEN -1
# define EVP_CTRL_GCM_SET_TAG -1
# define EVP_CTRL_GCM_GET_TAG -1
#endif

/* Replace missing EVP_CIPHER_CTX_ctrl() with something that returns failure */
#ifndef HAVE_EVP_CIPHER_CTX_CTRL
# ifdef OPENSSL_HAVE_EVPGCM
#  error AES-GCM enabled without EVP_CIPHER_CTX_ctrl /* shouldn't happen */
# else
# define EVP_CIPHER_CTX_ctrl(a,b,c,d) (0)
# endif
#endif

#if defined(HAVE_EVP_RIPEMD160)
# if defined(OPENSSL_NO_RIPEMD) || defined(OPENSSL_NO_RMD160)
#  undef HAVE_EVP_RIPEMD160
# endif
#endif

/*
 * We overload some of the OpenSSL crypto functions with ssh_* equivalents
 * to automatically handle OpenSSL engine initialisation.
 *
 * In order for the compat library to call the real functions, it must
 * define SSH_DONT_OVERLOAD_OPENSSL_FUNCS before including this file and
 * implement the ssh_* equivalents.
 */
#ifndef SSH_DONT_OVERLOAD_OPENSSL_FUNCS

# ifdef USE_OPENSSL_ENGINE
#  ifdef OpenSSL_add_all_algorithms
#   undef OpenSSL_add_all_algorithms
#  endif
#  define OpenSSL_add_all_algorithms()  ssh_OpenSSL_add_all_algorithms()
# endif

void ssh_OpenSSL_add_all_algorithms(void);

#endif	/* SSH_DONT_OVERLOAD_OPENSSL_FUNCS */

/* LibreSSL/OpenSSL 1.1x API compat */
#ifndef HAVE_DSA_GET0_PQG
void DSA_get0_pqg(const DSA *d, const BIGNUM **p, const BIGNUM **q,
    const BIGNUM **g);
#endif /* HAVE_DSA_GET0_PQG */

#ifndef HAVE_DSA_SET0_PQG
int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g);
#endif /* HAVE_DSA_SET0_PQG */

#ifndef HAVE_DSA_GET0_KEY
void DSA_get0_key(const DSA *d, const BIGNUM **pub_key,
    const BIGNUM **priv_key);
#endif /* HAVE_DSA_GET0_KEY */

#ifndef HAVE_DSA_SET0_KEY
int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key);
#endif /* HAVE_DSA_SET0_KEY */

#ifndef HAVE_EVP_CIPHER_CTX_GET_IV
int EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX *ctx,
    unsigned char *iv, size_t len);
#endif /* HAVE_EVP_CIPHER_CTX_GET_IV */

#ifndef HAVE_EVP_CIPHER_CTX_SET_IV
int EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX *ctx,
    const unsigned char *iv, size_t len);
#endif /* HAVE_EVP_CIPHER_CTX_SET_IV */

#ifndef HAVE_RSA_GET0_KEY
void RSA_get0_key(const RSA *r, const BIGNUM **n, const BIGNUM **e,
    const BIGNUM **d);
#endif /* HAVE_RSA_GET0_KEY */

#ifndef HAVE_RSA_SET0_KEY
int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d);
#endif /* HAVE_RSA_SET0_KEY */

#ifndef HAVE_RSA_GET0_CRT_PARAMS
void RSA_get0_crt_params(const RSA *r, const BIGNUM **dmp1, const BIGNUM **dmq1,
    const BIGNUM **iqmp);
#endif /* HAVE_RSA_GET0_CRT_PARAMS */

#ifndef HAVE_RSA_SET0_CRT_PARAMS
int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp);
#endif /* HAVE_RSA_SET0_CRT_PARAMS */

#ifndef HAVE_RSA_GET0_FACTORS
void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q);
#endif /* HAVE_RSA_GET0_FACTORS */

#ifndef HAVE_RSA_SET0_FACTORS
int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q);
#endif /* HAVE_RSA_SET0_FACTORS */

#ifndef DSA_SIG_GET0
void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
#endif /* DSA_SIG_GET0 */

#ifndef DSA_SIG_SET0
int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s);
#endif /* DSA_SIG_SET0 */

#ifndef HAVE_ECDSA_SIG_GET0
void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
#endif /* HAVE_ECDSA_SIG_GET0 */

#ifndef HAVE_ECDSA_SIG_SET0
int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
#endif /* HAVE_ECDSA_SIG_SET0 */

#ifndef HAVE_DH_GET0_PQG
void DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q,
    const BIGNUM **g);
#endif /* HAVE_DH_GET0_PQG */

#ifndef HAVE_DH_SET0_PQG
int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
#endif /* HAVE_DH_SET0_PQG */

#ifndef HAVE_DH_GET0_KEY
void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key);
#endif /* HAVE_DH_GET0_KEY */

#ifndef HAVE_DH_SET0_KEY
int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
#endif /* HAVE_DH_SET0_KEY */

#ifndef HAVE_DH_SET_LENGTH
int DH_set_length(DH *dh, long length);
#endif /* HAVE_DH_SET_LENGTH */

#ifndef HAVE_RSA_METH_FREE
void RSA_meth_free(RSA_METHOD *meth);
#endif /* HAVE_RSA_METH_FREE */

#ifndef HAVE_RSA_METH_DUP
RSA_METHOD *RSA_meth_dup(const RSA_METHOD *meth);
#endif /* HAVE_RSA_METH_DUP */

#ifndef HAVE_RSA_METH_SET1_NAME
int RSA_meth_set1_name(RSA_METHOD *meth, const char *name);
#endif /* HAVE_RSA_METH_SET1_NAME */

#ifndef HAVE_RSA_METH_GET_FINISH
int (*RSA_meth_get_finish(const RSA_METHOD *meth))(RSA *rsa);
#endif /* HAVE_RSA_METH_GET_FINISH */

#ifndef HAVE_RSA_METH_SET_PRIV_ENC
int RSA_meth_set_priv_enc(RSA_METHOD *meth, int (*priv_enc)(int flen,
    const unsigned char *from, unsigned char *to, RSA *rsa, int padding));
#endif /* HAVE_RSA_METH_SET_PRIV_ENC */

#ifndef HAVE_RSA_METH_SET_PRIV_DEC
int RSA_meth_set_priv_dec(RSA_METHOD *meth, int (*priv_dec)(int flen,
    const unsigned char *from, unsigned char *to, RSA *rsa, int padding));
#endif /* HAVE_RSA_METH_SET_PRIV_DEC */

#ifndef HAVE_RSA_METH_SET_FINISH
int RSA_meth_set_finish(RSA_METHOD *meth, int (*finish)(RSA *rsa));
#endif /* HAVE_RSA_METH_SET_FINISH */

#ifndef HAVE_EVP_PKEY_GET0_RSA
RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey);
#endif /* HAVE_EVP_PKEY_GET0_RSA */

#ifndef HAVE_EVP_MD_CTX_new
EVP_MD_CTX *EVP_MD_CTX_new(void);
#endif /* HAVE_EVP_MD_CTX_new */

#ifndef HAVE_EVP_MD_CTX_free
void EVP_MD_CTX_free(EVP_MD_CTX *ctx);
#endif /* HAVE_EVP_MD_CTX_free */

#endif /* WITH_OPENSSL */
#endif /* _OPENSSL_COMPAT_H */