text: /*
   * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   * Copyright 2005 Nokia. All rights reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdio.h>
  #include "ssl_locl.h"
  #include "record/record_locl.h"
  #include "internal/ktls.h"
  #include "internal/cryptlib.h"
  #include <openssl/comp.h>
  #include <openssl/evp.h>
  #include <openssl/kdf.h>
  #include <openssl/rand.h>
  #include <openssl/obj_mac.h>
  
  /* seed1 through seed5 are concatenated */
  static int tls1_PRF(SSL *s,
                      const void *seed1, size_t seed1_len,
                      const void *seed2, size_t seed2_len,
                      const void *seed3, size_t seed3_len,
                      const void *seed4, size_t seed4_len,
                      const void *seed5, size_t seed5_len,
                      const unsigned char *sec, size_t slen,
                      unsigned char *out, size_t olen, int fatal)
  {
      const EVP_MD *md = VR_ssl_prf_md(s);
      EVP_PKEY_CTX *pctx = NULL;
      int ret = 0;
  
      if (md == NULL) {
          /* Should never happen */
          if (fatal)
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
                       ERR_R_INTERNAL_ERROR);
          else
              SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
          return 0;
      }
      pctx = VR_EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
      if (pctx == NULL || VR_EVP_PKEY_derive_init(pctx) <= 0
          || EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
          || EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, (int)slen) <= 0
          || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, (int)seed1_len) <= 0
          || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, (int)seed2_len) <= 0
          || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, (int)seed3_len) <= 0
          || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, (int)seed4_len) <= 0
          || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, (int)seed5_len) <= 0
          || VR_EVP_PKEY_derive(pctx, out, &olen) <= 0) {
          if (fatal)
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
                       ERR_R_INTERNAL_ERROR);
          else
              SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
          goto err;
      }
  
      ret = 1;
  
   err:
      VR_EVP_PKEY_CTX_free(pctx);
      return ret;
  }
  
  static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
  {
      int ret;
  
      /* Calls SSLfatal() as required */
      ret = tls1_PRF(s,
                     TLS_MD_KEY_EXPANSION_CONST,
                     TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
                     SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
                     NULL, 0, NULL, 0, s->session->master_key,
                     s->session->master_key_length, km, num, 1);
  
      return ret;
  }
  
  int VR_tls1_change_cipher_state(SSL *s, int which)
  {
      unsigned char *p, *mac_secret;
      unsigned char *ms, *key, *iv;
      EVP_CIPHER_CTX *dd;
      const EVP_CIPHER *c;
  #ifndef OPENSSL_NO_COMP
      const SSL_COMP *comp;
  #endif
      const EVP_MD *m;
      int mac_type;
      size_t *mac_secret_size;
      EVP_MD_CTX *mac_ctx;
      EVP_PKEY *mac_key;
      size_t n, i, j, k, cl;
      int reuse_dd = 0;
  #ifndef OPENSSL_NO_KTLS
      struct tls12_crypto_info_aes_gcm_128 crypto_info;
      BIO *wbio;
      unsigned char geniv[12];
  #endif
  
      c = s->s3->tmp.new_sym_enc;
      m = s->s3->tmp.new_hash;
      mac_type = s->s3->tmp.new_mac_pkey_type;
  #ifndef OPENSSL_NO_COMP
      comp = s->s3->tmp.new_compression;
  #endif
  
      if (which & SSL3_CC_READ) {
          if (s->ext.use_etm)
              s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
          else
              s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
  
          if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
              s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
          else
              s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
  
          if (s->enc_read_ctx != NULL) {
              reuse_dd = 1;
          } else if ((s->enc_read_ctx = VR_EVP_CIPHER_CTX_new()) == NULL) {
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_MALLOC_FAILURE);
              goto err;
          } else {
              /*
               * make sure it's initialised in case we exit later with an error
               */
              VR_EVP_CIPHER_CTX_reset(s->enc_read_ctx);
          }
          dd = s->enc_read_ctx;
          mac_ctx = VR_ssl_replace_hash(&s->read_hash, NULL);
          if (mac_ctx == NULL) {
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_INTERNAL_ERROR);
              goto err;
          }
  #ifndef OPENSSL_NO_COMP
          VR_COMP_CTX_free(s->expand);
          s->expand = NULL;
          if (comp != NULL) {
              s->expand = VR_COMP_CTX_new(comp->method);
              if (s->expand == NULL) {
                  SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                           SSL_F_TLS1_CHANGE_CIPHER_STATE,
                           SSL_R_COMPRESSION_LIBRARY_ERROR);
                  goto err;
              }
          }
  #endif
          /*
           * this is done by VR_dtls1_reset_seq_numbers for DTLS
           */
          if (!SSL_IS_DTLS(s))
              VR_RECORD_LAYER_reset_read_sequence(&s->rlayer);
          mac_secret = &(s->s3->read_mac_secret[0]);
          mac_secret_size = &(s->s3->read_mac_secret_size);
      } else {
          s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
          if (s->ext.use_etm)
              s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
          else
              s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
  
          if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
              s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
          else
              s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
          if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
              reuse_dd = 1;
          } else if ((s->enc_write_ctx = VR_EVP_CIPHER_CTX_new()) == NULL) {
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_MALLOC_FAILURE);
              goto err;
          }
          dd = s->enc_write_ctx;
          if (SSL_IS_DTLS(s)) {
              mac_ctx = VR_EVP_MD_CTX_new();
              if (mac_ctx == NULL) {
                  SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                           SSL_F_TLS1_CHANGE_CIPHER_STATE,
                           ERR_R_MALLOC_FAILURE);
                  goto err;
              }
              s->write_hash = mac_ctx;
          } else {
              mac_ctx = VR_ssl_replace_hash(&s->write_hash, NULL);
              if (mac_ctx == NULL) {
                  SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                           SSL_F_TLS1_CHANGE_CIPHER_STATE,
                           ERR_R_MALLOC_FAILURE);
                  goto err;
              }
          }
  #ifndef OPENSSL_NO_COMP
          VR_COMP_CTX_free(s->compress);
          s->compress = NULL;
          if (comp != NULL) {
              s->compress = VR_COMP_CTX_new(comp->method);
              if (s->compress == NULL) {
                  SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                           SSL_F_TLS1_CHANGE_CIPHER_STATE,
                          SSL_R_COMPRESSION_LIBRARY_ERROR);
                  goto err;
              }
          }
  #endif
          /*
           * this is done by VR_dtls1_reset_seq_numbers for DTLS
           */
          if (!SSL_IS_DTLS(s))
              VR_RECORD_LAYER_reset_write_sequence(&s->rlayer);
          mac_secret = &(s->s3->write_mac_secret[0]);
          mac_secret_size = &(s->s3->write_mac_secret_size);
      }
  
      if (reuse_dd)
          VR_EVP_CIPHER_CTX_reset(dd);
  
      p = s->s3->tmp.key_block;
      i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
  
      /* TODO(size_t): convert me */
      cl = VR_EVP_CIPHER_key_length(c);
      j = cl;
      /* Was j=(exp)?5:VR_EVP_CIPHER_key_length(c); */
      /* If GCM/CCM mode only part of IV comes from PRF */
      if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
          k = EVP_GCM_TLS_FIXED_IV_LEN;
      else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
          k = EVP_CCM_TLS_FIXED_IV_LEN;
      else
          k = VR_EVP_CIPHER_iv_length(c);
      if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
          (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
          ms = &(p[0]);
          n = i + i;
          key = &(p[n]);
          n += j + j;
          iv = &(p[n]);
          n += k + k;
      } else {
          n = i;
          ms = &(p[n]);
          n += i + j;
          key = &(p[n]);
          n += j + k;
          iv = &(p[n]);
          n += k;
      }
  
      if (n > s->s3->tmp.key_block_length) {
          SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                   ERR_R_INTERNAL_ERROR);
          goto err;
      }
  
      memcpy(mac_secret, ms, i);
  
      if (!(VR_EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
          /* TODO(size_t): Convert this function */
          mac_key = VR_EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
                                                 (int)*mac_secret_size);
          if (mac_key == NULL
              || VR_EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
              VR_EVP_PKEY_free(mac_key);
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_INTERNAL_ERROR);
              goto err;
          }
          VR_EVP_PKEY_free(mac_key);
      }
  #ifdef SSL_DEBUG
      printf("which = %04X\nmac key=", which);
      {
          size_t z;
          for (z = 0; z < i; z++)
              printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n');
      }
  #endif
  
      if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
          if (!VR_EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
              || !VR_EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
                                      iv)) {
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_INTERNAL_ERROR);
              goto err;
          }
      } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
          int taglen;
          if (s->s3->tmp.
              new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
              taglen = EVP_CCM8_TLS_TAG_LEN;
          else
              taglen = EVP_CCM_TLS_TAG_LEN;
          if (!VR_EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
              || !VR_EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
              || !VR_EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
              || !VR_EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
              || !VR_EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_INTERNAL_ERROR);
              goto err;
          }
      } else {
          if (!VR_EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
              SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                       ERR_R_INTERNAL_ERROR);
              goto err;
          }
      }
      /* Needed for "composite" AEADs, such as VR_RC4-VR_HMAC-VR_MD5 */
      if ((VR_EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
          && !VR_EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
                                  (int)*mac_secret_size, mac_secret)) {
          SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                   ERR_R_INTERNAL_ERROR);
          goto err;
      }
  #ifndef OPENSSL_NO_KTLS
      if (s->compress)
          goto skip_ktls;
  
      if ((which & SSL3_CC_READ) ||
          ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX)))
          goto skip_ktls;
  
      /* ktls supports only the maximum fragment size */
      if (VR_ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
          goto skip_ktls;
  
      /* check that cipher is AES_GCM_128 */
      if (VR_EVP_CIPHER_nid(c) != NID_aes_128_gcm
          || EVP_CIPHER_mode(c) != EVP_CIPH_GCM_MODE
          || VR_EVP_CIPHER_key_length(c) != TLS_CIPHER_AES_GCM_128_KEY_SIZE)
          goto skip_ktls;
  
      /* check version is 1.2 */
      if (s->version != TLS1_2_VERSION)
          goto skip_ktls;
  
      wbio = s->wbio;
      if (!ossl_assert(wbio != NULL)) {
          SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                   ERR_R_INTERNAL_ERROR);
          goto err;
      }
  
      /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
      if (VR_BIO_flush(wbio) <= 0)
          goto skip_ktls;
  
      /* ktls doesn't support renegotiation */
      if (BIO_get_ktls_send(s->wbio)) {
          SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE,
                   ERR_R_INTERNAL_ERROR);
          goto err;
      }
  
      memset(&crypto_info, 0, sizeof(crypto_info));
      crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;
      crypto_info.info.version = s->version;
  
      VR_EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GET_IV,
                          EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN,
                          geniv);
      memcpy(crypto_info.iv, geniv + EVP_GCM_TLS_FIXED_IV_LEN,
             TLS_CIPHER_AES_GCM_128_IV_SIZE);
      memcpy(crypto_info.salt, geniv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
      memcpy(crypto_info.key, key, VR_EVP_CIPHER_key_length(c));
      memcpy(crypto_info.rec_seq, &s->rlayer.write_sequence,
             TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
  
      /* ktls works with user provided buffers directly */
      if (BIO_set_ktls(wbio, &crypto_info, which & SSL3_CC_WRITE)) {
          VR_ssl3_release_write_buffer(s);
          VR_SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
      }
  
   skip_ktls:
  #endif                          /* OPENSSL_NO_KTLS */
      s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
  
  #ifdef SSL_DEBUG
      printf("which = %04X\nkey=", which);
      {
          int z;
          for (z = 0; z < VR_EVP_CIPHER_key_length(c); z++)
              printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n');
      }
      printf("\niv=");
      {
          size_t z;
          for (z = 0; z < k; z++)
              printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n');
      }
      printf("\n");
  #endif
  
      return 1;
   err:
      return 0;
  }
  
  int VR_tls1_setup_key_block(SSL *s)
  {
      unsigned char *p;
      const EVP_CIPHER *c;
      const EVP_MD *hash;
      SSL_COMP *comp;
      int mac_type = NID_undef;
      size_t num, mac_secret_size = 0;
      int ret = 0;
  
      if (s->s3->tmp.key_block_length != 0)
          return 1;
  
      if (!VR_ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
                              &comp, s->ext.use_etm)) {
          SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
                   SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
          return 0;
      }
  
      s->s3->tmp.new_sym_enc = c;
      s->s3->tmp.new_hash = hash;
      s->s3->tmp.new_mac_pkey_type = mac_type;
      s->s3->tmp.new_mac_secret_size = mac_secret_size;
      num = VR_EVP_CIPHER_key_length(c) + mac_secret_size + VR_EVP_CIPHER_iv_length(c);
      num *= 2;
  
      VR_ssl3_cleanup_key_block(s);
  
      if ((p = OPENSSL_malloc(num)) == NULL) {
          SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
                   ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      s->s3->tmp.key_block_length = num;
      s->s3->tmp.key_block = p;
  
  #ifdef SSL_DEBUG
      printf("client random\n");
      {
          int z;
          for (z = 0; z < SSL3_RANDOM_SIZE; z++)
              printf("%02X%c", s->s3->client_random[z],
                     ((z + 1) % 16) ? ' ' : '\n');
      }
      printf("server random\n");
      {
          int z;
          for (z = 0; z < SSL3_RANDOM_SIZE; z++)
              printf("%02X%c", s->s3->server_random[z],
                     ((z + 1) % 16) ? ' ' : '\n');
      }
      printf("master key\n");
      {
          size_t z;
          for (z = 0; z < s->session->master_key_length; z++)
              printf("%02X%c", s->session->master_key[z],
                     ((z + 1) % 16) ? ' ' : '\n');
      }
  #endif
      if (!tls1_generate_key_block(s, p, num)) {
          /* SSLfatal() already called */
          goto err;
      }
  #ifdef SSL_DEBUG
      printf("\nkey block\n");
      {
          size_t z;
          for (z = 0; z < num; z++)
              printf("%02X%c", p[z], ((z + 1) % 16) ? ' ' : '\n');
      }
  #endif
  
      if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
          && s->method->version <= TLS1_VERSION) {
          /*
           * enable vulnerability countermeasure for CBC ciphers with known-IV
           * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
           */
          s->s3->need_empty_fragments = 1;
  
          if (s->session->cipher != NULL) {
              if (s->session->cipher->algorithm_enc == SSL_eNULL)
                  s->s3->need_empty_fragments = 0;
  
  #ifndef OPENSSL_NO_VR_RC4
              if (s->session->cipher->algorithm_enc == SSL_VR_RC4)
                  s->s3->need_empty_fragments = 0;
  #endif
          }
      }
  
      ret = 1;
   err:
      return ret;
  }
  
  size_t VR_tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
                               unsigned char *out)
  {
      size_t hashlen;
      unsigned char hash[EVP_MAX_MD_SIZE];
  
      if (!VR_ssl3_digest_cached_records(s, 0)) {
          /* SSLfatal() already called */
          return 0;
      }
  
      if (!VR_ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
          /* SSLfatal() already called */
          return 0;
      }
  
      if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
                    s->session->master_key, s->session->master_key_length,
                    out, TLS1_FINISH_MAC_LENGTH, 1)) {
          /* SSLfatal() already called */
          return 0;
      }
      VR_OPENSSL_cleanse(hash, hashlen);
      return TLS1_FINISH_MAC_LENGTH;
  }
  
  int VR_tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
                                  size_t len, size_t *secret_size)
  {
      if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
          unsigned char hash[EVP_MAX_MD_SIZE * 2];
          size_t hashlen;
          /*
           * Digest cached records keeping record buffer (if present): this wont
           * affect client auth because we're freezing the buffer at the same
           * point (after client key exchange and before certificate verify)
           */
          if (!VR_ssl3_digest_cached_records(s, 1)
                  || !VR_ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
              /* SSLfatal() already called */
              return 0;
          }
  #ifdef SSL_DEBUG
          fprintf(stderr, "Handshake hashes:\n");
          VR_BIO_dump_fp(stderr, (char *)hash, hashlen);
  #endif
          if (!tls1_PRF(s,
                        TLS_MD_EXTENDED_MASTER_SECRET_CONST,
                        TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
                        hash, hashlen,
                        NULL, 0,
                        NULL, 0,
                        NULL, 0, p, len, out,
                        SSL3_MASTER_SECRET_SIZE, 1)) {
              /* SSLfatal() already called */
              return 0;
          }
          VR_OPENSSL_cleanse(hash, hashlen);
      } else {
          if (!tls1_PRF(s,
                        TLS_MD_MASTER_SECRET_CONST,
                        TLS_MD_MASTER_SECRET_CONST_SIZE,
                        s->s3->client_random, SSL3_RANDOM_SIZE,
                        NULL, 0,
                        s->s3->server_random, SSL3_RANDOM_SIZE,
                        NULL, 0, p, len, out,
                        SSL3_MASTER_SECRET_SIZE, 1)) {
             /* SSLfatal() already called */
              return 0;
          }
      }
  #ifdef SSL_DEBUG
      fprintf(stderr, "Premaster Secret:\n");
      VR_BIO_dump_fp(stderr, (char *)p, len);
      fprintf(stderr, "Client Random:\n");
      VR_BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE);
      fprintf(stderr, "Server Random:\n");
      VR_BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE);
      fprintf(stderr, "Master Secret:\n");
      VR_BIO_dump_fp(stderr, (char *)s->session->master_key,
                  SSL3_MASTER_SECRET_SIZE);
  #endif
  
      *secret_size = SSL3_MASTER_SECRET_SIZE;
      return 1;
  }
  
  int VR_tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
                                  const char *label, size_t llen,
                                  const unsigned char *context,
                                  size_t contextlen, int use_context)
  {
      unsigned char *val = NULL;
      size_t vallen = 0, currentvalpos;
      int rv;
  
      /*
       * construct PRF arguments we construct the PRF argument ourself rather
       * than passing separate values into the TLS PRF to ensure that the
       * concatenation of values does not create a prohibited label.
       */
      vallen = llen + SSL3_RANDOM_SIZE * 2;
      if (use_context) {
          vallen += 2 + contextlen;
      }
  
      val = OPENSSL_malloc(vallen);
      if (val == NULL)
          goto err2;
      currentvalpos = 0;
      memcpy(val + currentvalpos, (unsigned char *)label, llen);
      currentvalpos += llen;
      memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
      currentvalpos += SSL3_RANDOM_SIZE;
      memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
      currentvalpos += SSL3_RANDOM_SIZE;
  
      if (use_context) {
          val[currentvalpos] = (contextlen >> 8) & 0xff;
          currentvalpos++;
          val[currentvalpos] = contextlen & 0xff;
          currentvalpos++;
          if ((contextlen > 0) || (context != NULL)) {
              memcpy(val + currentvalpos, context, contextlen);
          }
      }
  
      /*
       * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
       * label len) = 15, so size of val > max(prohibited label len) = 15 and
       * the comparisons won't have buffer overflow
       */
      if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
                 TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
          goto err1;
      if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
                 TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
          goto err1;
      if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
                 TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
          goto err1;
      if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
                 TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
          goto err1;
      if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
                 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
          goto err1;
  
      rv = tls1_PRF(s,
                    val, vallen,
                    NULL, 0,
                    NULL, 0,
                    NULL, 0,
                    NULL, 0,
                    s->session->master_key, s->session->master_key_length,
                    out, olen, 0);
  
      goto ret;
   err1:
      SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
      rv = 0;
      goto ret;
   err2:
      SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
      rv = 0;
   ret:
      OPENVR_SSL_clear_free(val, vallen);
      return rv;
  }
  
  int VR_tls1_alert_code(int code)
  {
      switch (code) {
      case SSL_AD_CLOSE_NOTIFY:
          return SSL3_AD_CLOSE_NOTIFY;
      case SSL_AD_UNEXPECTED_MESSAGE:
          return SSL3_AD_UNEXPECTED_MESSAGE;
      case SSL_AD_BAD_RECORD_MAC:
          return SSL3_AD_BAD_RECORD_MAC;
      case SSL_AD_DECRYPTION_FAILED:
          return TLS1_AD_DECRYPTION_FAILED;
      case SSL_AD_RECORD_OVERFLOW:
          return TLS1_AD_RECORD_OVERFLOW;
      case SSL_AD_DECOMPRESSION_FAILURE:
          return SSL3_AD_DECOMPRESSION_FAILURE;
      case SSL_AD_HANDSHAKE_FAILURE:
          return SSL3_AD_HANDSHAKE_FAILURE;
      case SSL_AD_NO_CERTIFICATE:
          return -1;
      case SSL_AD_BAD_CERTIFICATE:
          return SSL3_AD_BAD_CERTIFICATE;
      case SSL_AD_UNSUPPORTED_CERTIFICATE:
          return SSL3_AD_UNSUPPORTED_CERTIFICATE;
      case SSL_AD_CERTIFICATE_REVOKED:
          return SSL3_AD_CERTIFICATE_REVOKED;
      case SSL_AD_CERTIFICATE_EXPIRED:
          return SSL3_AD_CERTIFICATE_EXPIRED;
      case SSL_AD_CERTIFICATE_UNKNOWN:
          return SSL3_AD_CERTIFICATE_UNKNOWN;
      case SSL_AD_ILLEGAL_PARAMETER:
          return SSL3_AD_ILLEGAL_PARAMETER;
      case SSL_AD_UNKNOWN_CA:
          return TLS1_AD_UNKNOWN_CA;
      case SSL_AD_ACCESS_DENIED:
          return TLS1_AD_ACCESS_DENIED;
      case SSL_AD_DECODE_ERROR:
          return TLS1_AD_DECODE_ERROR;
      case SSL_AD_DECRYPT_ERROR:
          return TLS1_AD_DECRYPT_ERROR;
      case SSL_AD_EXPORT_RESTRICTION:
          return TLS1_AD_EXPORT_RESTRICTION;
      case SSL_AD_PROTOCOL_VERSION:
          return TLS1_AD_PROTOCOL_VERSION;
      case SSL_AD_INSUFFICIENT_SECURITY:
          return TLS1_AD_INSUFFICIENT_SECURITY;
      case SSL_AD_INTERNAL_ERROR:
          return TLS1_AD_INTERNAL_ERROR;
      case SSL_AD_USER_CANCELLED:
          return TLS1_AD_USER_CANCELLED;
      case SSL_AD_NO_RENEGOTIATION:
          return TLS1_AD_NO_RENEGOTIATION;
      case SSL_AD_UNSUPPORTED_EXTENSION:
          return TLS1_AD_UNSUPPORTED_EXTENSION;
      case SSL_AD_CERTIFICATE_UNOBTAINABLE:
          return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
      case SSL_AD_UNRECOGNIZED_NAME:
          return TLS1_AD_UNRECOGNIZED_NAME;
      case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
          return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
      case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
          return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
      case SSL_AD_UNKNOWN_PSK_IDENTITY:
          return TLS1_AD_UNKNOWN_PSK_IDENTITY;
      case SSL_AD_INAPPROPRIATE_FALLBACK:
          return TLS1_AD_INAPPROPRIATE_FALLBACK;
      case SSL_AD_NO_APPLICATION_PROTOCOL:
          return TLS1_AD_NO_APPLICATION_PROTOCOL;
      case SSL_AD_CERTIFICATE_REQUIRED:
          return SSL_AD_HANDSHAKE_FAILURE;
      default:
          return -1;
      }
  }
  