src/openssl.h - third_party/libssh2 - Git at Google

 /* Copyright (C) 2009, 2010 Simon Josefsson
  * Copyright (C) 2006, 2007 The Written Word, Inc.  All rights reserved.
  *
  * Author: Simon Josefsson
  *
  * Redistribution and use in source and binary forms,
  * with or without modification, are permitted provided
  * that the following conditions are met:
  *
  *   Redistributions of source code must retain the above
  *   copyright notice, this list of conditions and the
  *   following disclaimer.
  *
  *   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.
  *
  *   Neither the name of the copyright holder nor the names
  *   of any other contributors may be used to endorse or
  *   promote products derived from this software without
  *   specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
  */

 #include <openssl/opensslconf.h>
 #include <openssl/sha.h>
 #include <openssl/rsa.h>
 #include <openssl/engine.h>
 #ifndef OPENSSL_NO_DSA
 #include <openssl/dsa.h>
 #endif
 #ifndef OPENSSL_NO_MD5
 #include <openssl/md5.h>
 #endif
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
 #include <openssl/bn.h>
 #include <openssl/pem.h>
 #include <openssl/rand.h>

 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
     !defined(LIBRESSL_VERSION_NUMBER)
 # define HAVE_OPAQUE_STRUCTS 1
 #endif

 #ifdef OPENSSL_NO_RSA
 # define LIBSSH2_RSA 0
 #else
 # define LIBSSH2_RSA 1
 #endif

 #ifdef OPENSSL_NO_DSA
 # define LIBSSH2_DSA 0
 #else
 # define LIBSSH2_DSA 1
 #endif

 #ifdef OPENSSL_NO_MD5
 # define LIBSSH2_MD5 0
 #else
 # define LIBSSH2_MD5 1
 #endif

 #ifdef OPENSSL_NO_RIPEMD
 # define LIBSSH2_HMAC_RIPEMD 0
 #else
 # define LIBSSH2_HMAC_RIPEMD 1
 #endif

 #define LIBSSH2_HMAC_SHA256 1
 #define LIBSSH2_HMAC_SHA512 1

 #if OPENSSL_VERSION_NUMBER >= 0x00907000L && !defined(OPENSSL_NO_AES)
 # define LIBSSH2_AES_CTR 1
 # define LIBSSH2_AES 1
 #else
 # define LIBSSH2_AES_CTR 0
 # define LIBSSH2_AES 0
 #endif

 #ifdef OPENSSL_NO_BF
 # define LIBSSH2_BLOWFISH 0
 #else
 # define LIBSSH2_BLOWFISH 1
 #endif

 #ifdef OPENSSL_NO_RC4
 # define LIBSSH2_RC4 0
 #else
 # define LIBSSH2_RC4 1
 #endif

 #ifdef OPENSSL_NO_CAST
 # define LIBSSH2_CAST 0
 #else
 # define LIBSSH2_CAST 1
 #endif

 #ifdef OPENSSL_NO_DES
 # define LIBSSH2_3DES 0
 #else
 # define LIBSSH2_3DES 1
 #endif

 #define _libssh2_random(buf, len) RAND_bytes ((buf), (len))

 #define libssh2_prepare_iovec(vec, len)  /* Empty. */

 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_sha1_ctx EVP_MD_CTX *
 #else
 #define libssh2_sha1_ctx EVP_MD_CTX
 #endif

 /* returns 0 in case of failure */
 int _libssh2_sha1_init(libssh2_sha1_ctx *ctx);
 #define libssh2_sha1_init(x) _libssh2_sha1_init(x)
 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_sha1_update(ctx, data, len) EVP_DigestUpdate(ctx, data, len)
 #define libssh2_sha1_final(ctx, out) do { \
                                          EVP_DigestFinal(ctx, out, NULL); \
                                          EVP_MD_CTX_free(ctx); \
                                      } while(0)
 #else
 #define libssh2_sha1_update(ctx, data, len) EVP_DigestUpdate(&(ctx), data, len)
 #define libssh2_sha1_final(ctx, out) EVP_DigestFinal(&(ctx), out, NULL)
 #endif
 int _libssh2_sha1(const unsigned char *message, unsigned long len,
                   unsigned char *out);
 #define libssh2_sha1(x,y,z) _libssh2_sha1(x,y,z)

 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_sha256_ctx EVP_MD_CTX *
 #else
 #define libssh2_sha256_ctx EVP_MD_CTX
 #endif

 /* returns 0 in case of failure */
 int _libssh2_sha256_init(libssh2_sha256_ctx *ctx);
 #define libssh2_sha256_init(x) _libssh2_sha256_init(x)
 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_sha256_update(ctx, data, len) EVP_DigestUpdate(ctx, data, len)
 #define libssh2_sha256_final(ctx, out) do { \
                                            EVP_DigestFinal(ctx, out, NULL); \
                                            EVP_MD_CTX_free(ctx); \
                                        } while(0)
 #else
 #define libssh2_sha256_update(ctx, data, len) EVP_DigestUpdate(&(ctx), data, len)
 #define libssh2_sha256_final(ctx, out) EVP_DigestFinal(&(ctx), out, NULL)
 #endif
 int _libssh2_sha256(const unsigned char *message, unsigned long len,
                   unsigned char *out);
 #define libssh2_sha256(x,y,z) _libssh2_sha256(x,y,z)

 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_md5_ctx EVP_MD_CTX *
 #else
 #define libssh2_md5_ctx EVP_MD_CTX
 #endif

 /* returns 0 in case of failure */
 int _libssh2_md5_init(libssh2_md5_ctx *ctx);
 #define libssh2_md5_init(x) _libssh2_md5_init(x)
 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_md5_update(ctx, data, len) EVP_DigestUpdate(ctx, data, len)
 #define libssh2_md5_final(ctx, out) do { \
                                         EVP_DigestFinal(ctx, out, NULL); \
                                         EVP_MD_CTX_free(ctx); \
                                     } while(0)
 #else
 #define libssh2_md5_update(ctx, data, len) EVP_DigestUpdate(&(ctx), data, len)
 #define libssh2_md5_final(ctx, out) EVP_DigestFinal(&(ctx), out, NULL)
 #endif

 #ifdef HAVE_OPAQUE_STRUCTS
 #define libssh2_hmac_ctx HMAC_CTX *
 #define libssh2_hmac_ctx_init(ctx) ctx = HMAC_CTX_new()
 #define libssh2_hmac_sha1_init(ctx, key, keylen) \
   HMAC_Init_ex(*(ctx), key, keylen, EVP_sha1(), NULL)
 #define libssh2_hmac_md5_init(ctx, key, keylen) \
   HMAC_Init_ex(*(ctx), key, keylen, EVP_md5(), NULL)
 #define libssh2_hmac_ripemd160_init(ctx, key, keylen) \
   HMAC_Init_ex(*(ctx), key, keylen, EVP_ripemd160(), NULL)
 #define libssh2_hmac_sha256_init(ctx, key, keylen) \
   HMAC_Init_ex(*(ctx), key, keylen, EVP_sha256(), NULL)
 #define libssh2_hmac_sha512_init(ctx, key, keylen) \
   HMAC_Init_ex(*(ctx), key, keylen, EVP_sha512(), NULL)

 #define libssh2_hmac_update(ctx, data, datalen) \
   HMAC_Update(ctx, data, datalen)
 #define libssh2_hmac_final(ctx, data) HMAC_Final(ctx, data, NULL)
 #define libssh2_hmac_cleanup(ctx) HMAC_CTX_free(*(ctx))
 #else
 #define libssh2_hmac_ctx HMAC_CTX
 #define libssh2_hmac_ctx_init(ctx) \
   HMAC_CTX_init(&ctx)
 #define libssh2_hmac_sha1_init(ctx, key, keylen) \
   HMAC_Init_ex(ctx, key, keylen, EVP_sha1(), NULL)
 #define libssh2_hmac_md5_init(ctx, key, keylen) \
   HMAC_Init_ex(ctx, key, keylen, EVP_md5(), NULL)
 #define libssh2_hmac_ripemd160_init(ctx, key, keylen) \
   HMAC_Init_ex(ctx, key, keylen, EVP_ripemd160(), NULL)
 #define libssh2_hmac_sha256_init(ctx, key, keylen) \
   HMAC_Init_ex(ctx, key, keylen, EVP_sha256(), NULL)
 #define libssh2_hmac_sha512_init(ctx, key, keylen) \
   HMAC_Init_ex(ctx, key, keylen, EVP_sha512(), NULL)

 #define libssh2_hmac_update(ctx, data, datalen) \
   HMAC_Update(&(ctx), data, datalen)
 #define libssh2_hmac_final(ctx, data) HMAC_Final(&(ctx), data, NULL)
 #define libssh2_hmac_cleanup(ctx) HMAC_cleanup(ctx)
 #endif

 #define libssh2_crypto_init() \
   OpenSSL_add_all_algorithms(); \
   ENGINE_load_builtin_engines(); \
   ENGINE_register_all_complete()

 #define libssh2_crypto_exit()

 #define libssh2_rsa_ctx RSA

 #define _libssh2_rsa_free(rsactx) RSA_free(rsactx)

 #define libssh2_dsa_ctx DSA


 #define _libssh2_dsa_free(dsactx) DSA_free(dsactx)

 #define _libssh2_cipher_type(name) const EVP_CIPHER *(*name)(void)
 #ifdef HAVE_OPAQUE_STRUCTS
 #define _libssh2_cipher_ctx EVP_CIPHER_CTX *
 #else
 #define _libssh2_cipher_ctx EVP_CIPHER_CTX
 #endif

 #define _libssh2_cipher_aes256 EVP_aes_256_cbc
 #define _libssh2_cipher_aes192 EVP_aes_192_cbc
 #define _libssh2_cipher_aes128 EVP_aes_128_cbc
 #ifdef HAVE_EVP_AES_128_CTR
 #define _libssh2_cipher_aes128ctr EVP_aes_128_ctr
 #define _libssh2_cipher_aes192ctr EVP_aes_192_ctr
 #define _libssh2_cipher_aes256ctr EVP_aes_256_ctr
 #else
 #define _libssh2_cipher_aes128ctr _libssh2_EVP_aes_128_ctr
 #define _libssh2_cipher_aes192ctr _libssh2_EVP_aes_192_ctr
 #define _libssh2_cipher_aes256ctr _libssh2_EVP_aes_256_ctr
 #endif
 #define _libssh2_cipher_blowfish EVP_bf_cbc
 #define _libssh2_cipher_arcfour EVP_rc4
 #define _libssh2_cipher_cast5 EVP_cast5_cbc
 #define _libssh2_cipher_3des EVP_des_ede3_cbc

 #ifdef HAVE_OPAQUE_STRUCTS
 #define _libssh2_cipher_dtor(ctx) EVP_CIPHER_CTX_free(*(ctx))
 #else
 #define _libssh2_cipher_dtor(ctx) EVP_CIPHER_CTX_cleanup(ctx)
 #endif

 #define _libssh2_bn BIGNUM
 #define _libssh2_bn_ctx BN_CTX
 #define _libssh2_bn_ctx_new() BN_CTX_new()
 #define _libssh2_bn_ctx_free(bnctx) BN_CTX_free(bnctx)
 #define _libssh2_bn_init() BN_new()
 #define _libssh2_bn_init_from_bin() _libssh2_bn_init()
 #define _libssh2_bn_set_word(bn, val) BN_set_word(bn, val)
 #define _libssh2_bn_from_bin(bn, len, val) BN_bin2bn(val, len, bn)
 #define _libssh2_bn_to_bin(bn, val) BN_bn2bin(bn, val)
 #define _libssh2_bn_bytes(bn) BN_num_bytes(bn)
 #define _libssh2_bn_bits(bn) BN_num_bits(bn)
 #define _libssh2_bn_free(bn) BN_clear_free(bn)

 #define _libssh2_dh_ctx BIGNUM *
 #define libssh2_dh_init(dhctx) _libssh2_dh_init(dhctx)
 #define libssh2_dh_key_pair(dhctx, public, g, p, group_order, bnctx) \
         _libssh2_dh_key_pair(dhctx, public, g, p, group_order, bnctx)
 #define libssh2_dh_secret(dhctx, secret, f, p, bnctx) \
         _libssh2_dh_secret(dhctx, secret, f, p, bnctx)
 #define libssh2_dh_dtor(dhctx) _libssh2_dh_dtor(dhctx)
 extern void _libssh2_dh_init(_libssh2_dh_ctx *dhctx);
 extern int _libssh2_dh_key_pair(_libssh2_dh_ctx *dhctx, _libssh2_bn *public,
                                 _libssh2_bn *g, _libssh2_bn *p, int group_order,
                                 _libssh2_bn_ctx *bnctx);
 extern int _libssh2_dh_secret(_libssh2_dh_ctx *dhctx, _libssh2_bn *secret,
                               _libssh2_bn *f, _libssh2_bn *p,
                               _libssh2_bn_ctx *bnctx);
 extern void _libssh2_dh_dtor(_libssh2_dh_ctx *dhctx);

 const EVP_CIPHER *_libssh2_EVP_aes_128_ctr(void);
 const EVP_CIPHER *_libssh2_EVP_aes_192_ctr(void);
 const EVP_CIPHER *_libssh2_EVP_aes_256_ctr(void);
	/* Copyright (C) 2009, 2010 Simon Josefsson
	* Copyright (C) 2006, 2007 The Written Word, Inc. All rights reserved.
	*
	* Author: Simon Josefsson
	*
	* Redistribution and use in source and binary forms,
	* with or without modification, are permitted provided
	* that the following conditions are met:
	*
	* Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the
	* following disclaimer.
	*
	* 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.
	*
	* Neither the name of the copyright holder nor the names
	* of any other contributors may be used to endorse or
	* promote products derived from this software without
	* specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
	*/

	#include <openssl/opensslconf.h>
	#include <openssl/sha.h>
	#include <openssl/rsa.h>
	#include <openssl/engine.h>
	#ifndef OPENSSL_NO_DSA
	#include <openssl/dsa.h>
	#endif
	#ifndef OPENSSL_NO_MD5
	#include <openssl/md5.h>
	#endif
	#include <openssl/evp.h>
	#include <openssl/hmac.h>
	#include <openssl/bn.h>
	#include <openssl/pem.h>
	#include <openssl/rand.h>

	#if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
	!defined(LIBRESSL_VERSION_NUMBER)
	# define HAVE_OPAQUE_STRUCTS 1
	#endif

	#ifdef OPENSSL_NO_RSA
	# define LIBSSH2_RSA 0
	#else
	# define LIBSSH2_RSA 1
	#endif

	#ifdef OPENSSL_NO_DSA
	# define LIBSSH2_DSA 0
	#else
	# define LIBSSH2_DSA 1
	#endif

	#ifdef OPENSSL_NO_MD5
	# define LIBSSH2_MD5 0
	#else
	# define LIBSSH2_MD5 1
	#endif

	#ifdef OPENSSL_NO_RIPEMD
	# define LIBSSH2_HMAC_RIPEMD 0
	#else
	# define LIBSSH2_HMAC_RIPEMD 1
	#endif

	#define LIBSSH2_HMAC_SHA256 1
	#define LIBSSH2_HMAC_SHA512 1

	#if OPENSSL_VERSION_NUMBER >= 0x00907000L && !defined(OPENSSL_NO_AES)
	# define LIBSSH2_AES_CTR 1
	# define LIBSSH2_AES 1
	#else
	# define LIBSSH2_AES_CTR 0
	# define LIBSSH2_AES 0
	#endif

	#ifdef OPENSSL_NO_BF
	# define LIBSSH2_BLOWFISH 0
	#else
	# define LIBSSH2_BLOWFISH 1
	#endif

	#ifdef OPENSSL_NO_RC4
	# define LIBSSH2_RC4 0
	#else
	# define LIBSSH2_RC4 1
	#endif

	#ifdef OPENSSL_NO_CAST
	# define LIBSSH2_CAST 0
	#else
	# define LIBSSH2_CAST 1
	#endif

	#ifdef OPENSSL_NO_DES
	# define LIBSSH2_3DES 0
	#else
	# define LIBSSH2_3DES 1
	#endif

	#define _libssh2_random(buf, len) RAND_bytes ((buf), (len))

	#define libssh2_prepare_iovec(vec, len) /* Empty. */

	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_sha1_ctx EVP_MD_CTX *
	#else
	#define libssh2_sha1_ctx EVP_MD_CTX
	#endif

	/* returns 0 in case of failure */
	int _libssh2_sha1_init(libssh2_sha1_ctx *ctx);
	#define libssh2_sha1_init(x) _libssh2_sha1_init(x)
	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_sha1_update(ctx, data, len) EVP_DigestUpdate(ctx, data, len)
	#define libssh2_sha1_final(ctx, out) do { \
	EVP_DigestFinal(ctx, out, NULL); \
	EVP_MD_CTX_free(ctx); \
	} while(0)
	#else
	#define libssh2_sha1_update(ctx, data, len) EVP_DigestUpdate(&(ctx), data, len)
	#define libssh2_sha1_final(ctx, out) EVP_DigestFinal(&(ctx), out, NULL)
	#endif
	int _libssh2_sha1(const unsigned char *message, unsigned long len,
	unsigned char *out);
	#define libssh2_sha1(x,y,z) _libssh2_sha1(x,y,z)

	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_sha256_ctx EVP_MD_CTX *
	#else
	#define libssh2_sha256_ctx EVP_MD_CTX
	#endif

	/* returns 0 in case of failure */
	int _libssh2_sha256_init(libssh2_sha256_ctx *ctx);
	#define libssh2_sha256_init(x) _libssh2_sha256_init(x)
	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_sha256_update(ctx, data, len) EVP_DigestUpdate(ctx, data, len)
	#define libssh2_sha256_final(ctx, out) do { \
	EVP_DigestFinal(ctx, out, NULL); \
	EVP_MD_CTX_free(ctx); \
	} while(0)
	#else
	#define libssh2_sha256_update(ctx, data, len) EVP_DigestUpdate(&(ctx), data, len)
	#define libssh2_sha256_final(ctx, out) EVP_DigestFinal(&(ctx), out, NULL)
	#endif
	int _libssh2_sha256(const unsigned char *message, unsigned long len,
	unsigned char *out);
	#define libssh2_sha256(x,y,z) _libssh2_sha256(x,y,z)

	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_md5_ctx EVP_MD_CTX *
	#else
	#define libssh2_md5_ctx EVP_MD_CTX
	#endif

	/* returns 0 in case of failure */
	int _libssh2_md5_init(libssh2_md5_ctx *ctx);
	#define libssh2_md5_init(x) _libssh2_md5_init(x)
	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_md5_update(ctx, data, len) EVP_DigestUpdate(ctx, data, len)
	#define libssh2_md5_final(ctx, out) do { \
	EVP_DigestFinal(ctx, out, NULL); \
	EVP_MD_CTX_free(ctx); \
	} while(0)
	#else
	#define libssh2_md5_update(ctx, data, len) EVP_DigestUpdate(&(ctx), data, len)
	#define libssh2_md5_final(ctx, out) EVP_DigestFinal(&(ctx), out, NULL)
	#endif

	#ifdef HAVE_OPAQUE_STRUCTS
	#define libssh2_hmac_ctx HMAC_CTX *
	#define libssh2_hmac_ctx_init(ctx) ctx = HMAC_CTX_new()
	#define libssh2_hmac_sha1_init(ctx, key, keylen) \
	HMAC_Init_ex(*(ctx), key, keylen, EVP_sha1(), NULL)
	#define libssh2_hmac_md5_init(ctx, key, keylen) \
	HMAC_Init_ex(*(ctx), key, keylen, EVP_md5(), NULL)
	#define libssh2_hmac_ripemd160_init(ctx, key, keylen) \
	HMAC_Init_ex(*(ctx), key, keylen, EVP_ripemd160(), NULL)
	#define libssh2_hmac_sha256_init(ctx, key, keylen) \
	HMAC_Init_ex(*(ctx), key, keylen, EVP_sha256(), NULL)
	#define libssh2_hmac_sha512_init(ctx, key, keylen) \
	HMAC_Init_ex(*(ctx), key, keylen, EVP_sha512(), NULL)

	#define libssh2_hmac_update(ctx, data, datalen) \
	HMAC_Update(ctx, data, datalen)
	#define libssh2_hmac_final(ctx, data) HMAC_Final(ctx, data, NULL)
	#define libssh2_hmac_cleanup(ctx) HMAC_CTX_free(*(ctx))
	#else
	#define libssh2_hmac_ctx HMAC_CTX
	#define libssh2_hmac_ctx_init(ctx) \
	HMAC_CTX_init(&ctx)
	#define libssh2_hmac_sha1_init(ctx, key, keylen) \
	HMAC_Init_ex(ctx, key, keylen, EVP_sha1(), NULL)
	#define libssh2_hmac_md5_init(ctx, key, keylen) \
	HMAC_Init_ex(ctx, key, keylen, EVP_md5(), NULL)
	#define libssh2_hmac_ripemd160_init(ctx, key, keylen) \
	HMAC_Init_ex(ctx, key, keylen, EVP_ripemd160(), NULL)
	#define libssh2_hmac_sha256_init(ctx, key, keylen) \
	HMAC_Init_ex(ctx, key, keylen, EVP_sha256(), NULL)
	#define libssh2_hmac_sha512_init(ctx, key, keylen) \
	HMAC_Init_ex(ctx, key, keylen, EVP_sha512(), NULL)

	#define libssh2_hmac_update(ctx, data, datalen) \
	HMAC_Update(&(ctx), data, datalen)
	#define libssh2_hmac_final(ctx, data) HMAC_Final(&(ctx), data, NULL)
	#define libssh2_hmac_cleanup(ctx) HMAC_cleanup(ctx)
	#endif

	#define libssh2_crypto_init() \
	OpenSSL_add_all_algorithms(); \
	ENGINE_load_builtin_engines(); \
	ENGINE_register_all_complete()

	#define libssh2_crypto_exit()

	#define libssh2_rsa_ctx RSA

	#define _libssh2_rsa_free(rsactx) RSA_free(rsactx)

	#define libssh2_dsa_ctx DSA


	#define _libssh2_dsa_free(dsactx) DSA_free(dsactx)

	#define _libssh2_cipher_type(name) const EVP_CIPHER (name)(void)
	#ifdef HAVE_OPAQUE_STRUCTS
	#define _libssh2_cipher_ctx EVP_CIPHER_CTX *
	#else
	#define _libssh2_cipher_ctx EVP_CIPHER_CTX
	#endif

	#define _libssh2_cipher_aes256 EVP_aes_256_cbc
	#define _libssh2_cipher_aes192 EVP_aes_192_cbc
	#define _libssh2_cipher_aes128 EVP_aes_128_cbc
	#ifdef HAVE_EVP_AES_128_CTR
	#define _libssh2_cipher_aes128ctr EVP_aes_128_ctr
	#define _libssh2_cipher_aes192ctr EVP_aes_192_ctr
	#define _libssh2_cipher_aes256ctr EVP_aes_256_ctr
	#else
	#define _libssh2_cipher_aes128ctr _libssh2_EVP_aes_128_ctr
	#define _libssh2_cipher_aes192ctr _libssh2_EVP_aes_192_ctr
	#define _libssh2_cipher_aes256ctr _libssh2_EVP_aes_256_ctr
	#endif
	#define _libssh2_cipher_blowfish EVP_bf_cbc
	#define _libssh2_cipher_arcfour EVP_rc4
	#define _libssh2_cipher_cast5 EVP_cast5_cbc
	#define _libssh2_cipher_3des EVP_des_ede3_cbc

	#ifdef HAVE_OPAQUE_STRUCTS
	#define _libssh2_cipher_dtor(ctx) EVP_CIPHER_CTX_free(*(ctx))
	#else
	#define _libssh2_cipher_dtor(ctx) EVP_CIPHER_CTX_cleanup(ctx)
	#endif

	#define _libssh2_bn BIGNUM
	#define _libssh2_bn_ctx BN_CTX
	#define _libssh2_bn_ctx_new() BN_CTX_new()
	#define _libssh2_bn_ctx_free(bnctx) BN_CTX_free(bnctx)
	#define _libssh2_bn_init() BN_new()
	#define _libssh2_bn_init_from_bin() _libssh2_bn_init()
	#define _libssh2_bn_set_word(bn, val) BN_set_word(bn, val)
	#define _libssh2_bn_from_bin(bn, len, val) BN_bin2bn(val, len, bn)
	#define _libssh2_bn_to_bin(bn, val) BN_bn2bin(bn, val)
	#define _libssh2_bn_bytes(bn) BN_num_bytes(bn)
	#define _libssh2_bn_bits(bn) BN_num_bits(bn)
	#define _libssh2_bn_free(bn) BN_clear_free(bn)

	#define _libssh2_dh_ctx BIGNUM *
	#define libssh2_dh_init(dhctx) _libssh2_dh_init(dhctx)
	#define libssh2_dh_key_pair(dhctx, public, g, p, group_order, bnctx) \
	_libssh2_dh_key_pair(dhctx, public, g, p, group_order, bnctx)
	#define libssh2_dh_secret(dhctx, secret, f, p, bnctx) \
	_libssh2_dh_secret(dhctx, secret, f, p, bnctx)
	#define libssh2_dh_dtor(dhctx) _libssh2_dh_dtor(dhctx)
	extern void _libssh2_dh_init(_libssh2_dh_ctx *dhctx);
	extern int _libssh2_dh_key_pair(_libssh2_dh_ctx dhctx, _libssh2_bn public,
	_libssh2_bn g, _libssh2_bn p, int group_order,
	_libssh2_bn_ctx *bnctx);
	extern int _libssh2_dh_secret(_libssh2_dh_ctx dhctx, _libssh2_bn secret,
	_libssh2_bn f, _libssh2_bn p,
	_libssh2_bn_ctx *bnctx);
	extern void _libssh2_dh_dtor(_libssh2_dh_ctx *dhctx);

	const EVP_CIPHER *_libssh2_EVP_aes_128_ctr(void);
	const EVP_CIPHER *_libssh2_EVP_aes_192_ctr(void);
	const EVP_CIPHER *_libssh2_EVP_aes_256_ctr(void);