text: /* Copyright (C) 2009 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>
  #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>
  
  #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
  
  #if OPENSSL_VERSION_NUMBER >= 0x00907000L && !defined(OPENSSL_NO_AES)
  # define LIBSSH2_AES_CTR 1
  # define LIBSSH2_AES 1
  #else
  # define LIBSSH2_AES 0
  #endif
  
  #ifdef OPENSSL_NO_BLOWFISH
  # 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_sha1_ctx SHA_CTX
  #define libssh2_sha1_init(ctx) SHA1_Init(ctx)
  #define libssh2_sha1_update(ctx, data, len) SHA1_Update(&(ctx), data, len)
  #define libssh2_sha1_final(ctx, out) SHA1_Final(out, &(ctx))
  #define libssh2_sha1(message, len, out) SHA1(message, len, out)
  
  #define libssh2_md5_ctx MD5_CTX
  #define libssh2_md5_init(ctx) MD5_Init(ctx)
  #define libssh2_md5_update(ctx, data, len) MD5_Update(&(ctx), data, len)
  #define libssh2_md5_final(ctx, out) MD5_Final(out, &(ctx))
  #define libssh2_md5(message, len, out) MD5(message, len, out)
  
  #define libssh2_hmac_ctx HMAC_CTX
  #define libssh2_hmac_sha1_init(ctx, key, keylen) \
    HMAC_Init(ctx, key, keylen, EVP_sha1())
  #define libssh2_hmac_md5_init(ctx, key, keylen) \
    HMAC_Init(ctx, key, keylen, EVP_md5())
  #define libssh2_hmac_ripemd160_init(ctx, key, keylen) \
    HMAC_Init(ctx, key, keylen, EVP_ripemd160())
  #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)
  
  #define libssh2_crypto_init()
  
  #define libssh2_rsa_ctx RSA
  
  int _libssh2_rsa_new(libssh2_rsa_ctx ** rsa,
                       const unsigned char *edata,
                       unsigned long elen,
                       const unsigned char *ndata,
                       unsigned long nlen,
                       const unsigned char *ddata,
                       unsigned long dlen,
                       const unsigned char *pdata,
                       unsigned long plen,
                       const unsigned char *qdata,
                       unsigned long qlen,
                       const unsigned char *e1data,
                       unsigned long e1len,
                       const unsigned char *e2data,
                       unsigned long e2len,
                       const unsigned char *coeffdata, unsigned long coefflen);
  int _libssh2_rsa_new_private(libssh2_rsa_ctx ** rsa,
                               LIBSSH2_SESSION * session,
                               const char *filename,
                               unsigned const char *passphrase);
  int _libssh2_rsa_sha1_verify(libssh2_rsa_ctx * rsa,
                               const unsigned char *sig,
                               unsigned long sig_len,
                               const unsigned char *m, unsigned long m_len);
  int _libssh2_rsa_sha1_sign(LIBSSH2_SESSION * session,
                             libssh2_rsa_ctx * rsactx,
                             const unsigned char *hash,
                             unsigned long hash_len,
                             unsigned char **signature,
                             unsigned long *signature_len);
  
  #define _libssh2_rsa_free(rsactx) RSA_free(rsactx)
  
  #define libssh2_dsa_ctx DSA
  
  int _libssh2_dsa_new(libssh2_dsa_ctx ** dsa,
                       const unsigned char *pdata,
                       unsigned long plen,
                       const unsigned char *qdata,
                       unsigned long qlen,
                       const unsigned char *gdata,
                       unsigned long glen,
                       const unsigned char *ydata,
                       unsigned long ylen,
                       const unsigned char *x, unsigned long x_len);
  int _libssh2_dsa_new_private(libssh2_dsa_ctx ** dsa,
                               LIBSSH2_SESSION * session,
                               const char *filename,
                               unsigned const char *passphrase);
  int _libssh2_dsa_sha1_verify(libssh2_dsa_ctx * dsactx,
                               const unsigned char *sig,
                               const unsigned char *m, unsigned long m_len);
  int _libssh2_dsa_sha1_sign(libssh2_dsa_ctx * dsactx,
                             const unsigned char *hash,
                             unsigned long hash_len, unsigned char *sig);
  
  #define _libssh2_dsa_free(dsactx) DSA_free(dsactx)
  
  #define _libssh2_cipher_type(name) const EVP_CIPHER *(*name)(void)
  #define _libssh2_cipher_ctx EVP_CIPHER_CTX
  
  #define _libssh2_cipher_aes256 EVP_aes_256_cbc
  #define _libssh2_cipher_aes192 EVP_aes_192_cbc
  #define _libssh2_cipher_aes128 EVP_aes_128_cbc
  #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
  #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
  
  int _libssh2_cipher_init(_libssh2_cipher_ctx * h,
                           _libssh2_cipher_type(algo),
                           unsigned char *iv,
                           unsigned char *secret, int encrypt);
  
  int _libssh2_cipher_crypt(_libssh2_cipher_ctx * ctx,
                            _libssh2_cipher_type(algo),
                            int encrypt, unsigned char *block);
  
  #define _libssh2_cipher_dtor(ctx) EVP_CIPHER_CTX_cleanup(ctx)
  
  #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_rand(bn, bits, top, bottom) BN_rand(bn, bits, top, bottom)
  #define _libssh2_bn_mod_exp(r, a, p, m, ctx) BN_mod_exp(r, a, p, m, ctx)
  #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)
  
  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);
  