text: /* ssl/s2_lib.c */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * 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 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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 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.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  /* ====================================================================
   * Copyright (c) 1998-2007 The OpenSSL 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. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    openssl-core@openssl.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED 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 OpenSSL PROJECT OR
   * ITS 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.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  #include "ssl_locl.h"
  #ifndef OPENSSL_NO_SSL2
  # include <stdio.h>
  # include <openssl/objects.h>
  # include <openssl/evp.h>
  # include <openssl/md5.h>
  
  const char ssl2_version_str[] = "SSLv2" OPENSSL_VERSION_PTEXT;
  
  # define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
  
  /* list of available SSLv2 ciphers (sorted by id) */
  OPENSSL_GLOBAL const SSL_CIPHER ssl2_ciphers[] = {
  # if 0
  /* NULL_WITH_MD5 v3 */
      {
       1,
       SSL2_TXT_NULL_WITH_MD5,
       SSL2_CK_NULL_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_eNULL,
       SSL_MD5,
       SSL_SSLV2,
       SSL_EXPORT | SSL_EXP40 | SSL_STRONG_NONE,
       0,
       0,
       0,
       },
  # endif
  
  /* RC4_128_WITH_MD5 */
      {
       1,
       SSL2_TXT_RC4_128_WITH_MD5,
       SSL2_CK_RC4_128_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_RC4,
       SSL_MD5,
       SSL_SSLV2,
       SSL_NOT_EXP | SSL_MEDIUM,
       0,
       128,
       128,
       },
  
  # if 0
  /* RC4_128_EXPORT40_WITH_MD5 */
      {
       1,
       SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
       SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_RC4,
       SSL_MD5,
       SSL_SSLV2,
       SSL_EXPORT | SSL_EXP40,
       SSL2_CF_5_BYTE_ENC,
       40,
       128,
       },
  # endif
  
  /* RC2_128_CBC_WITH_MD5 */
      {
       1,
       SSL2_TXT_RC2_128_CBC_WITH_MD5,
       SSL2_CK_RC2_128_CBC_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_RC2,
       SSL_MD5,
       SSL_SSLV2,
       SSL_NOT_EXP | SSL_MEDIUM,
       0,
       128,
       128,
       },
  
  # if 0
  /* RC2_128_CBC_EXPORT40_WITH_MD5 */
      {
       1,
       SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
       SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_RC2,
       SSL_MD5,
       SSL_SSLV2,
       SSL_EXPORT | SSL_EXP40,
       SSL2_CF_5_BYTE_ENC,
       40,
       128,
       },
  # endif
  
  # ifndef OPENSSL_NO_IDEA
  /* IDEA_128_CBC_WITH_MD5 */
      {
       1,
       SSL2_TXT_IDEA_128_CBC_WITH_MD5,
       SSL2_CK_IDEA_128_CBC_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_IDEA,
       SSL_MD5,
       SSL_SSLV2,
       SSL_NOT_EXP | SSL_MEDIUM,
       0,
       128,
       128,
       },
  # endif
  
  # if 0
  /* DES_64_CBC_WITH_MD5 */
      {
       1,
       SSL2_TXT_DES_64_CBC_WITH_MD5,
       SSL2_CK_DES_64_CBC_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_DES,
       SSL_MD5,
       SSL_SSLV2,
       SSL_NOT_EXP | SSL_LOW,
       0,
       56,
       56,
       },
  # endif
  
  /* DES_192_EDE3_CBC_WITH_MD5 */
      {
       1,
       SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
       SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_3DES,
       SSL_MD5,
       SSL_SSLV2,
       SSL_NOT_EXP | SSL_HIGH,
       0,
       112,
       168,
       },
  
  # if 0
  /* RC4_64_WITH_MD5 */
      {
       1,
       SSL2_TXT_RC4_64_WITH_MD5,
       SSL2_CK_RC4_64_WITH_MD5,
       SSL_kRSA,
       SSL_aRSA,
       SSL_RC4,
       SSL_MD5,
       SSL_SSLV2,
       SSL_NOT_EXP | SSL_LOW,
       SSL2_CF_8_BYTE_ENC,
       64,
       64,
       },
  # endif
  
  # if 0
  /* NULL SSLeay (testing) */
      {
       0,
       SSL2_TXT_NULL,
       SSL2_CK_NULL,
       0,
       0,
       0,
       0,
       SSL_SSLV2,
       SSL_STRONG_NONE,
       0,
       0,
       0,
       },
  # endif
  
  /* end of list :-) */
  };
  
  long ssl2_default_timeout(void)
  {
      return (300);
  }
  
  int ssl2_num_ciphers(void)
  {
      return (SSL2_NUM_CIPHERS);
  }
  
  const SSL_CIPHER *ssl2_get_cipher(unsigned int u)
  {
      if (u < SSL2_NUM_CIPHERS)
          return (&(ssl2_ciphers[SSL2_NUM_CIPHERS - 1 - u]));
      else
          return (NULL);
  }
  
  int ssl2_pending(const SSL *s)
  {
      return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
  }
  
  int ssl2_new(SSL *s)
  {
      SSL2_STATE *s2;
  
      if ((s2 = OPENSSL_malloc(sizeof *s2)) == NULL)
          goto err;
      memset(s2, 0, sizeof *s2);
  
  # if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
  #  error "assertion failed"
  # endif
  
      if ((s2->rbuf =
           OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) == NULL)
          goto err;
      /*
       * wbuf needs one byte more because when using two-byte headers, we leave
       * the first byte unused in do_ssl_write (s2_pkt.c)
       */
      if ((s2->wbuf =
           OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 3)) == NULL)
          goto err;
      s->s2 = s2;
  
      ssl2_clear(s);
      return (1);
   err:
      if (s2 != NULL) {
          if (s2->wbuf != NULL)
              OPENSSL_free(s2->wbuf);
          if (s2->rbuf != NULL)
              OPENSSL_free(s2->rbuf);
          OPENSSL_free(s2);
      }
      return (0);
  }
  
  void ssl2_free(SSL *s)
  {
      SSL2_STATE *s2;
  
      if (s == NULL)
          return;
  
      s2 = s->s2;
      if (s2->rbuf != NULL)
          OPENSSL_free(s2->rbuf);
      if (s2->wbuf != NULL)
          OPENSSL_free(s2->wbuf);
      OPENSSL_cleanse(s2, sizeof *s2);
      OPENSSL_free(s2);
      s->s2 = NULL;
  }
  
  void ssl2_clear(SSL *s)
  {
      SSL2_STATE *s2;
      unsigned char *rbuf, *wbuf;
  
      s2 = s->s2;
  
      rbuf = s2->rbuf;
      wbuf = s2->wbuf;
  
      memset(s2, 0, sizeof *s2);
  
      s2->rbuf = rbuf;
      s2->wbuf = wbuf;
      s2->clear_text = 1;
      s->packet = s2->rbuf;
      s->version = SSL2_VERSION;
      s->packet_length = 0;
  }
  
  long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
  {
      int ret = 0;
  
      switch (cmd) {
      case SSL_CTRL_GET_SESSION_REUSED:
          ret = s->hit;
          break;
      case SSL_CTRL_CHECK_PROTO_VERSION:
          return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
      default:
          break;
      }
      return (ret);
  }
  
  long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
  {
      return (0);
  }
  
  long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
  {
      return (0);
  }
  
  long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
  {
      return (0);
  }
  
  /*
   * This function needs to check if the ciphers required are actually
   * available
   */
  const SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
  {
      SSL_CIPHER c;
      const SSL_CIPHER *cp;
      unsigned long id;
  
      id = 0x02000000L | ((unsigned long)p[0] << 16L) |
          ((unsigned long)p[1] << 8L) | (unsigned long)p[2];
      c.id = id;
      cp = OBJ_bsearch_ssl_cipher_id(&c, ssl2_ciphers, SSL2_NUM_CIPHERS);
      return cp;
  }
  
  int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
  {
      long l;
  
      if (p != NULL) {
          l = c->id;
          if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV)
              return (0);
          p[0] = ((unsigned char)(l >> 16L)) & 0xFF;
          p[1] = ((unsigned char)(l >> 8L)) & 0xFF;
          p[2] = ((unsigned char)(l)) & 0xFF;
      }
      return (3);
  }
  
  int ssl2_generate_key_material(SSL *s)
  {
      unsigned int i;
      EVP_MD_CTX ctx;
      unsigned char *km;
      unsigned char c = '0';
      const EVP_MD *md5;
      int md_size;
  
      md5 = EVP_md5();
  
  # ifdef CHARSET_EBCDIC
      c = os_toascii['0'];        /* Must be an ASCII '0', not EBCDIC '0', see
                                   * SSLv2 docu */
  # endif
      EVP_MD_CTX_init(&ctx);
      km = s->s2->key_material;
  
      if (s->session->master_key_length < 0 ||
          s->session->master_key_length > (int)sizeof(s->session->master_key)) {
          SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
          return 0;
      }
      md_size = EVP_MD_size(md5);
      if (md_size < 0)
          return 0;
      for (i = 0; i < s->s2->key_material_length; i += md_size) {
          if (((km - s->s2->key_material) + md_size) >
              (int)sizeof(s->s2->key_material)) {
              /*
               * EVP_DigestFinal_ex() below would write beyond buffer
               */
              SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
              return 0;
          }
  
          EVP_DigestInit_ex(&ctx, md5, NULL);
  
          OPENSSL_assert(s->session->master_key_length >= 0
                         && s->session->master_key_length
                         <= (int)sizeof(s->session->master_key));
          EVP_DigestUpdate(&ctx, s->session->master_key,
                           s->session->master_key_length);
          EVP_DigestUpdate(&ctx, &c, 1);
          c++;
          EVP_DigestUpdate(&ctx, s->s2->challenge, s->s2->challenge_length);
          EVP_DigestUpdate(&ctx, s->s2->conn_id, s->s2->conn_id_length);
          EVP_DigestFinal_ex(&ctx, km, NULL);
          km += md_size;
      }
  
      EVP_MD_CTX_cleanup(&ctx);
      return 1;
  }
  
  void ssl2_return_error(SSL *s, int err)
  {
      if (!s->error) {
          s->error = 3;
          s->error_code = err;
  
          ssl2_write_error(s);
      }
  }
  
  void ssl2_write_error(SSL *s)
  {
      unsigned char buf[3];
      int i, error;
  
      buf[0] = SSL2_MT_ERROR;
      buf[1] = (s->error_code >> 8) & 0xff;
      buf[2] = (s->error_code) & 0xff;
  
  /*      state=s->rwstate;*/
  
      error = s->error;           /* number of bytes left to write */
      s->error = 0;
      OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
      i = ssl2_write(s, &(buf[3 - error]), error);
  
  /*      if (i == error) s->rwstate=state; */
  
      if (i < 0)
          s->error = error;
      else {
          s->error = error - i;
  
          if (s->error == 0)
              if (s->msg_callback) {
                  /* ERROR */
                  s->msg_callback(1, s->version, 0, buf, 3, s,
                                  s->msg_callback_arg);
              }
      }
  }
  
  int ssl2_shutdown(SSL *s)
  {
      s->shutdown = (SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
      return (1);
  }
  #else                           /* !OPENSSL_NO_SSL2 */
  
  # if PEDANTIC
  static void *dummy = &dummy;
  # endif
  
  #endif
  