polarssl: removed

As detailed in DEPRECATE.md, the polarssl support is now removed after
having been disabled for 6 months and nobody has missed it.

The threadlock files used by mbedtls are renamed to an 'mbedtls' prefix
instead of the former 'polarssl' and the common functions that
previously were shared between mbedtls and polarssl and contained the
name 'polarssl' have now all been renamed to instead say 'mbedtls'.

Closes #4825

9 files changed, 55 insertions, 1049 deletions

diff --git a/docs/DEPRECATE.md b/docs/DEPRECATE.md
index 4f4ef8ab6..26877c48a 100644
--- a/docs/DEPRECATE.md
+++ b/docs/DEPRECATE.md
@@ -5,32 +5,8 @@ email the curl-library mailing list as soon as possible and explain to us why
 this is a problem for you and how your use case can't be satisfied properly
 using a work around.
 
-## PolarSSL
+## Past removals
 
-The polarssl TLS library has not had an update in over three years. The last
-release was done on [January 7
-2016](https://tls.mbed.org/tech-updates/releases). This library has been
-superseded by the mbedTLS library, which is the current incarnation of
-PolarSSL. curl has supported mbedTLS since 2015.
-
-It seems unlikely that this library is a good choice for users to get proper
-TLS security and support today and at the same time there are plenty of good
-and updated alternatives.
-
-I consider it likely that the existing users of curl + polarssl out there are
-stuck on old curl versions and when they eventually manage to update curl they
-should also be able to update their TLS library.
-
-### State
-
-In the curl 7.65.2 release (July 17, 2019) the ability to build with this TLS
-backend is removed from the configure script. The code remains and can be
-built and used going forward, but it has to be manually enabled in a build (or
-the configure removal reverted).
-
-### Removal
-
-The support for PolarSSL and all code for it will be completely removed from
-the curl code base six months after it ships disabled in configure in a
-release. In the release on or near February 27, 2020. (possibly called curl
-7.70.0).
+ - Pipelining
+ - axTLS
+ - PolarSSL
diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index 4e19ea90c..2b99aa320 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -28,15 +28,14 @@ LIB_VAUTH_CFILES = vauth/vauth.c vauth/cleartext.c vauth/cram.c         \
 LIB_VAUTH_HFILES = vauth/vauth.h vauth/digest.h vauth/ntlm.h
 
 LIB_VTLS_CFILES = vtls/openssl.c vtls/gtls.c vtls/vtls.c vtls/nss.c     \
-  vtls/polarssl.c vtls/polarssl_threadlock.c                            \
-  vtls/wolfssl.c vtls/schannel.c vtls/schannel_verify.c                 \
-  vtls/sectransp.c vtls/gskit.c vtls/mbedtls.c vtls/mesalink.c          \
-  vtls/bearssl.c
+  vtls/mbedtls_threadlock.c vtls/wolfssl.c vtls/schannel.c              \
+  vtls/schannel_verify.c vtls/sectransp.c vtls/gskit.c vtls/mbedtls.c   \
+  vtls/mesalink.c vtls/bearssl.c
 
-LIB_VTLS_HFILES = vtls/openssl.h vtls/vtls.h vtls/gtls.h                \
-  vtls/nssg.h vtls/polarssl.h vtls/polarssl_threadlock.h                \
-  vtls/wolfssl.h vtls/schannel.h vtls/sectransp.h vtls/gskit.h          \
-  vtls/mbedtls.h vtls/mesalink.h vtls/bearssl.h
+LIB_VTLS_HFILES = vtls/openssl.h vtls/vtls.h vtls/gtls.h vtls/nssg.h    \
+  vtls/mbedtls_threadlock.h vtls/wolfssl.h vtls/schannel.h              \
+  vtls/sectransp.h vtls/gskit.h vtls/mbedtls.h vtls/mesalink.h          \
+  vtls/bearssl.h
 
 LIB_VQUIC_CFILES = vquic/ngtcp2.c vquic/quiche.c
 
diff --git a/lib/vtls/mbedtls.c b/lib/vtls/mbedtls.c
index e34ec9d13..f057315f3 100644
--- a/lib/vtls/mbedtls.c
+++ b/lib/vtls/mbedtls.c
@@ -6,7 +6,7 @@
  *                             \___|\___/|_| \_\_____|
  *
  * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
- * Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2012 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -55,7 +55,7 @@
 #include "connect.h" /* for the connect timeout */
 #include "select.h"
 #include "multiif.h"
-#include "polarssl_threadlock.h"
+#include "mbedtls_threadlock.h"
 
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"
@@ -91,12 +91,12 @@ static int entropy_init_initialized = 0;
 static void entropy_init_mutex(mbedtls_entropy_context *ctx)
 {
   /* lock 0 = entropy_init_mutex() */
-  Curl_polarsslthreadlock_lock_function(0);
+  Curl_mbedtlsthreadlock_lock_function(0);
   if(entropy_init_initialized == 0) {
     mbedtls_entropy_init(ctx);
     entropy_init_initialized = 1;
   }
-  Curl_polarsslthreadlock_unlock_function(0);
+  Curl_mbedtlsthreadlock_unlock_function(0);
 }
 /* end of entropy_init_mutex() */
 
@@ -105,9 +105,9 @@ static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
 {
   int ret;
   /* lock 1 = entropy_func_mutex() */
-  Curl_polarsslthreadlock_lock_function(1);
+  Curl_mbedtlsthreadlock_lock_function(1);
   ret = mbedtls_entropy_func(data, output, len);
-  Curl_polarsslthreadlock_unlock_function(1);
+  Curl_mbedtlsthreadlock_unlock_function(1);
 
   return ret;
 }
@@ -1017,12 +1017,12 @@ static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
  */
 static int Curl_mbedtls_init(void)
 {
-  return Curl_polarsslthreadlock_thread_setup();
+  return Curl_mbedtlsthreadlock_thread_setup();
 }
 
 static void Curl_mbedtls_cleanup(void)
 {
-  (void)Curl_polarsslthreadlock_thread_cleanup();
+  (void)Curl_mbedtlsthreadlock_thread_cleanup();
 }
 
 static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
diff --git a/lib/vtls/polarssl_threadlock.c b/lib/vtls/mbedtls_threadlock.c
index 4e269c8e6..4d672f106 100644
--- a/lib/vtls/polarssl_threadlock.c
+++ b/lib/vtls/mbedtls_threadlock.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2013 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2013 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  * Copyright (C) 2010, 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
  *
  * This software is licensed as described in the file COPYING, which
@@ -22,19 +22,19 @@
  ***************************************************************************/
 #include "curl_setup.h"
 
-#if (defined(USE_POLARSSL) || defined(USE_MBEDTLS)) && \
-    ((defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)) || \
-     (defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)))
+#if defined(USE_MBEDTLS) &&                                     \
+  ((defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)) ||   \
+   (defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)))
 
 #if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
 #  include <pthread.h>
-#  define POLARSSL_MUTEX_T pthread_mutex_t
+#  define MBEDTLS_MUTEX_T pthread_mutex_t
 #elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
 #  include <process.h>
-#  define POLARSSL_MUTEX_T HANDLE
+#  define MBEDTLS_MUTEX_T HANDLE
 #endif
 
-#include "polarssl_threadlock.h"
+#include "mbedtls_threadlock.h"
 #include "curl_printf.h"
 #include "curl_memory.h"
 /* The last #include file should be: */
@@ -43,14 +43,14 @@
 /* number of thread locks */
 #define NUMT                    2
 
-/* This array will store all of the mutexes available to PolarSSL. */
-static POLARSSL_MUTEX_T *mutex_buf = NULL;
+/* This array will store all of the mutexes available to Mbedtls. */
+static MBEDTLS_MUTEX_T *mutex_buf = NULL;
 
-int Curl_polarsslthreadlock_thread_setup(void)
+int Curl_mbedtlsthreadlock_thread_setup(void)
 {
   int i;
 
-  mutex_buf = calloc(NUMT * sizeof(POLARSSL_MUTEX_T), 1);
+  mutex_buf = calloc(NUMT * sizeof(MBEDTLS_MUTEX_T), 1);
   if(!mutex_buf)
     return 0;     /* error, no number of threads defined */
 
@@ -70,7 +70,7 @@ int Curl_polarsslthreadlock_thread_setup(void)
   return 1; /* OK */
 }
 
-int Curl_polarsslthreadlock_thread_cleanup(void)
+int Curl_mbedtlsthreadlock_thread_cleanup(void)
 {
   int i;
 
@@ -95,7 +95,7 @@ int Curl_polarsslthreadlock_thread_cleanup(void)
   return 1; /* OK */
 }
 
-int Curl_polarsslthreadlock_lock_function(int n)
+int Curl_mbedtlsthreadlock_lock_function(int n)
 {
   if(n < NUMT) {
     int ret;
@@ -103,14 +103,14 @@ int Curl_polarsslthreadlock_lock_function(int n)
     ret = pthread_mutex_lock(&mutex_buf[n]);
     if(ret) {
       DEBUGF(fprintf(stderr,
-                     "Error: polarsslthreadlock_lock_function failed\n"));
+                     "Error: mbedtlsthreadlock_lock_function failed\n"));
       return 0; /* pthread_mutex_lock failed */
     }
 #elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
     ret = (WaitForSingleObject(mutex_buf[n], INFINITE) == WAIT_FAILED?1:0);
     if(ret) {
       DEBUGF(fprintf(stderr,
-                     "Error: polarsslthreadlock_lock_function failed\n"));
+                     "Error: mbedtlsthreadlock_lock_function failed\n"));
       return 0; /* pthread_mutex_lock failed */
     }
 #endif /* USE_THREADS_POSIX && HAVE_PTHREAD_H */
@@ -118,7 +118,7 @@ int Curl_polarsslthreadlock_lock_function(int n)
   return 1; /* OK */
 }
 
-int Curl_polarsslthreadlock_unlock_function(int n)
+int Curl_mbedtlsthreadlock_unlock_function(int n)
 {
   if(n < NUMT) {
     int ret;
@@ -126,14 +126,14 @@ int Curl_polarsslthreadlock_unlock_function(int n)
     ret = pthread_mutex_unlock(&mutex_buf[n]);
     if(ret) {
       DEBUGF(fprintf(stderr,
-                     "Error: polarsslthreadlock_unlock_function failed\n"));
+                     "Error: mbedtlsthreadlock_unlock_function failed\n"));
       return 0; /* pthread_mutex_unlock failed */
     }
 #elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
     ret = ReleaseMutex(mutex_buf[n]);
     if(!ret) {
       DEBUGF(fprintf(stderr,
-                     "Error: polarsslthreadlock_unlock_function failed\n"));
+                     "Error: mbedtlsthreadlock_unlock_function failed\n"));
       return 0; /* pthread_mutex_lock failed */
     }
 #endif /* USE_THREADS_POSIX && HAVE_PTHREAD_H */
@@ -141,4 +141,4 @@ int Curl_polarsslthreadlock_unlock_function(int n)
   return 1; /* OK */
 }
 
-#endif /* USE_POLARSSL || USE_MBEDTLS */
+#endif /* USE_MBEDTLS */
diff --git a/lib/vtls/polarssl_threadlock.h b/lib/vtls/mbedtls_threadlock.h
index c1900bfe8..96a787d1a 100644
--- a/lib/vtls/polarssl_threadlock.h
+++ b/lib/vtls/mbedtls_threadlock.h
@@ -1,5 +1,5 @@
-#ifndef HEADER_CURL_POLARSSL_THREADLOCK_H
-#define HEADER_CURL_POLARSSL_THREADLOCK_H
+#ifndef HEADER_CURL_MBEDTLS_THREADLOCK_H
+#define HEADER_CURL_MBEDTLS_THREADLOCK_H
 /***************************************************************************
  *                                  _   _ ____  _
  *  Project                     ___| | | |  _ \| |
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2013 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2013 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  * Copyright (C) 2010, Hoi-Ho Chan, <hoiho.chan@gmail.com>
  *
  * This software is licensed as described in the file COPYING, which
@@ -24,25 +24,25 @@
  ***************************************************************************/
 #include "curl_setup.h"
 
-#if (defined USE_POLARSSL) || (defined USE_MBEDTLS)
+#ifdef USE_MBEDTLS
 
 #if (defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)) || \
     (defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H))
 
-int Curl_polarsslthreadlock_thread_setup(void);
-int Curl_polarsslthreadlock_thread_cleanup(void);
-int Curl_polarsslthreadlock_lock_function(int n);
-int Curl_polarsslthreadlock_unlock_function(int n);
+int Curl_mbedtlsthreadlock_thread_setup(void);
+int Curl_mbedtlsthreadlock_thread_cleanup(void);
+int Curl_mbedtlsthreadlock_lock_function(int n);
+int Curl_mbedtlsthreadlock_unlock_function(int n);
 
 #else
 
-#define Curl_polarsslthreadlock_thread_setup() 1
-#define Curl_polarsslthreadlock_thread_cleanup() 1
-#define Curl_polarsslthreadlock_lock_function(x) 1
-#define Curl_polarsslthreadlock_unlock_function(x) 1
+#define Curl_mbedtlsthreadlock_thread_setup() 1
+#define Curl_mbedtlsthreadlock_thread_cleanup() 1
+#define Curl_mbedtlsthreadlock_lock_function(x) 1
+#define Curl_mbedtlsthreadlock_unlock_function(x) 1
 
 #endif /* USE_THREADS_POSIX || USE_THREADS_WIN32 */
 
-#endif /* USE_POLARSSL */
+#endif /* USE_MBEDTLS */
 
-#endif /* HEADER_CURL_POLARSSL_THREADLOCK_H */
+#endif /* HEADER_CURL_MBEDTLS_THREADLOCK_H */
diff --git a/lib/vtls/polarssl.c b/lib/vtls/polarssl.c
deleted file mode 100644
index 9e7dd9043..000000000
--- a/lib/vtls/polarssl.c
+++ /dev/null
@@ -1,931 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
- * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-/*
- * Source file for all PolarSSL-specific code for the TLS/SSL layer. No code
- * but vtls.c should ever call or use these functions.
- *
- */
-
-#include "curl_setup.h"
-
-#ifdef USE_POLARSSL
-#include <polarssl/net.h>
-#include <polarssl/ssl.h>
-#include <polarssl/certs.h>
-#include <polarssl/x509.h>
-#include <polarssl/version.h>
-#include <polarssl/sha256.h>
-
-#if POLARSSL_VERSION_NUMBER < 0x01030000
-#error too old PolarSSL
-#endif
-
-#include <polarssl/error.h>
-#include <polarssl/entropy.h>
-#include <polarssl/ctr_drbg.h>
-
-#include "urldata.h"
-#include "sendf.h"
-#include "inet_pton.h"
-#include "polarssl.h"
-#include "vtls.h"
-#include "parsedate.h"
-#include "connect.h" /* for the connect timeout */
-#include "select.h"
-#include "strcase.h"
-#include "polarssl_threadlock.h"
-#include "multiif.h"
-#include "curl_printf.h"
-#include "curl_memory.h"
-/* The last #include file should be: */
-#include "memdebug.h"
-
-/* See https://tls.mbed.org/discussions/generic/
-   howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
-*/
-#define RSA_PUB_DER_MAX_BYTES   (38 + 2 * POLARSSL_MPI_MAX_SIZE)
-#define ECP_PUB_DER_MAX_BYTES   (30 + 2 * POLARSSL_ECP_MAX_BYTES)
-
-#define PUB_DER_MAX_BYTES   (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
-                             RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
-
-struct ssl_backend_data {
-  ctr_drbg_context ctr_drbg;
-  entropy_context entropy;
-  ssl_context ssl;
-  int server_fd;
-  x509_crt cacert;
-  x509_crt clicert;
-  x509_crl crl;
-  rsa_context rsa;
-};
-
-#define BACKEND connssl->backend
-
-/* apply threading? */
-#if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
-#define THREADING_SUPPORT
-#endif
-
-#ifndef POLARSSL_ERROR_C
-#define error_strerror(x,y,z)
-#endif /* POLARSSL_ERROR_C */
-
-
-#if defined(THREADING_SUPPORT)
-static entropy_context entropy;
-
-static int  entropy_init_initialized  = 0;
-
-/* start of entropy_init_mutex() */
-static void entropy_init_mutex(entropy_context *ctx)
-{
-  /* lock 0 = entropy_init_mutex() */
-  Curl_polarsslthreadlock_lock_function(0);
-  if(entropy_init_initialized == 0) {
-    entropy_init(ctx);
-    entropy_init_initialized = 1;
-  }
-  Curl_polarsslthreadlock_unlock_function(0);
-}
-/* end of entropy_init_mutex() */
-
-/* start of entropy_func_mutex() */
-static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
-{
-  int ret;
-  /* lock 1 = entropy_func_mutex() */
-  Curl_polarsslthreadlock_lock_function(1);
-  ret = entropy_func(data, output, len);
-  Curl_polarsslthreadlock_unlock_function(1);
-
-  return ret;
-}
-/* end of entropy_func_mutex() */
-
-#endif /* THREADING_SUPPORT */
-
-/* Define this to enable lots of debugging for PolarSSL */
-#undef POLARSSL_DEBUG
-
-#ifdef POLARSSL_DEBUG
-static void polarssl_debug(void *context, int level, const char *line)
-{
-  struct Curl_easy *data = NULL;
-
-  if(!context)
-    return;
-
-  data = (struct Curl_easy *)context;
-
-  infof(data, "%s", line);
-  (void) level;
-}
-#else
-#endif
-
-/* ALPN for http2? */
-#ifdef POLARSSL_SSL_ALPN
-#  define HAS_ALPN
-#endif
-
-static Curl_recv polarssl_recv;
-static Curl_send polarssl_send;
-
-static CURLcode polarssl_version_from_curl(int *polarver, long ssl_version)
-{
-  switch(ssl_version) {
-    case CURL_SSLVERSION_TLSv1_0:
-      *polarver = SSL_MINOR_VERSION_1;
-      return CURLE_OK;
-    case CURL_SSLVERSION_TLSv1_1:
-      *polarver = SSL_MINOR_VERSION_2;
-      return CURLE_OK;
-    case CURL_SSLVERSION_TLSv1_2:
-      *polarver = SSL_MINOR_VERSION_3;
-      return CURLE_OK;
-    case CURL_SSLVERSION_TLSv1_3:
-      break;
-  }
-  return CURLE_SSL_CONNECT_ERROR;
-}
-
-static CURLcode
-set_ssl_version_min_max(struct connectdata *conn, int sockindex)
-{
-  struct Curl_easy *data = conn->data;
-  struct ssl_connect_data* connssl = &conn->ssl[sockindex];
-  long ssl_version = SSL_CONN_CONFIG(version);
-  long ssl_version_max = SSL_CONN_CONFIG(version_max);
-  int ssl_min_ver = SSL_MINOR_VERSION_1;
-  int ssl_max_ver = SSL_MINOR_VERSION_1;
-  CURLcode result = CURLE_OK;
-
-  switch(ssl_version) {
-    case CURL_SSLVERSION_DEFAULT:
-    case CURL_SSLVERSION_TLSv1:
-      ssl_version = CURL_SSLVERSION_TLSv1_0;
-      break;
-  }
-
-  switch(ssl_version_max) {
-    case CURL_SSLVERSION_MAX_NONE:
-    case CURL_SSLVERSION_MAX_DEFAULT:
-      ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
-      break;
-  }
-
-  result = polarssl_version_from_curl(&ssl_min_ver, ssl_version);
-  if(result) {
-    failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
-    return result;
-  }
-  result = polarssl_version_from_curl(&ssl_max_ver, ssl_version_max >> 16);
-  if(result) {
-    failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
-    return result;
-  }
-
-  ssl_set_min_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3, ssl_min_ver);
-  ssl_set_max_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3, ssl_max_ver);
-
-  return result;
-}
-
-static CURLcode
-polarssl_connect_step1(struct connectdata *conn,
-                       int sockindex)
-{
-  struct Curl_easy *data = conn->data;
-  struct ssl_connect_data* connssl = &conn->ssl[sockindex];
-  const char *capath = SSL_CONN_CONFIG(CApath);
-  const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
-    conn->host.name;
-  const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
-  int ret = -1;
-  char errorbuf[128];
-  errorbuf[0] = 0;
-
-  /* PolarSSL only supports SSLv3 and TLSv1 */
-  if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
-    failf(data, "PolarSSL does not support SSLv2");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-#ifdef THREADING_SUPPORT
-  entropy_init_mutex(&entropy);
-
-  if((ret = ctr_drbg_init(&BACKEND->ctr_drbg, entropy_func_mutex, &entropy,
-                          NULL, 0)) != 0) {
-    error_strerror(ret, errorbuf, sizeof(errorbuf));
-    failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
-          -ret, errorbuf);
-  }
-#else
-  entropy_init(&BACKEND->entropy);
-
-  if((ret = ctr_drbg_init(&BACKEND->ctr_drbg, entropy_func, &BACKEND->entropy,
-                          NULL, 0)) != 0) {
-    error_strerror(ret, errorbuf, sizeof(errorbuf));
-    failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
-          -ret, errorbuf);
-  }
-#endif /* THREADING_SUPPORT */
-
-  /* Load the trusted CA */
-  memset(&BACKEND->cacert, 0, sizeof(x509_crt));
-
-  if(SSL_CONN_CONFIG(CAfile)) {
-    ret = x509_crt_parse_file(&BACKEND->cacert,
-                              SSL_CONN_CONFIG(CAfile));
-
-    if(ret<0) {
-      error_strerror(ret, errorbuf, sizeof(errorbuf));
-      failf(data, "Error reading ca cert file %s - PolarSSL: (-0x%04X) %s",
-            SSL_CONN_CONFIG(CAfile), -ret, errorbuf);
-
-      if(SSL_CONN_CONFIG(verifypeer))
-        return CURLE_SSL_CACERT_BADFILE;
-    }
-  }
-
-  if(capath) {
-    ret = x509_crt_parse_path(&BACKEND->cacert, capath);
-
-    if(ret<0) {
-      error_strerror(ret, errorbuf, sizeof(errorbuf));
-      failf(data, "Error reading ca cert path %s - PolarSSL: (-0x%04X) %s",
-            capath, -ret, errorbuf);
-
-      if(SSL_CONN_CONFIG(verifypeer))
-        return CURLE_SSL_CACERT_BADFILE;
-    }
-  }
-
-  /* Load the client certificate */
-  memset(&BACKEND->clicert, 0, sizeof(x509_crt));
-
-  if(SSL_SET_OPTION(cert)) {
-    ret = x509_crt_parse_file(&BACKEND->clicert,
-                              SSL_SET_OPTION(cert));
-
-    if(ret) {
-      error_strerror(ret, errorbuf, sizeof(errorbuf));
-      failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s",
-            SSL_SET_OPTION(cert), -ret, errorbuf);
-
-      return CURLE_SSL_CERTPROBLEM;
-    }
-  }
-
-  /* Load the client private key */
-  if(SSL_SET_OPTION(key)) {
-    pk_context pk;
-    pk_init(&pk);
-    ret = pk_parse_keyfile(&pk, SSL_SET_OPTION(key),
-                           SSL_SET_OPTION(key_passwd));
-    if(ret == 0 && !pk_can_do(&pk, POLARSSL_PK_RSA))
-      ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
-    if(ret == 0)
-      rsa_copy(&BACKEND->rsa, pk_rsa(pk));
-    else
-      rsa_free(&BACKEND->rsa);
-    pk_free(&pk);
-
-    if(ret) {
-      error_strerror(ret, errorbuf, sizeof(errorbuf));
-      failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s",
-            SSL_SET_OPTION(key), -ret, errorbuf);
-
-      return CURLE_SSL_CERTPROBLEM;
-    }
-  }
-
-  /* Load the CRL */
-  memset(&BACKEND->crl, 0, sizeof(x509_crl));
-
-  if(SSL_SET_OPTION(CRLfile)) {
-    ret = x509_crl_parse_file(&BACKEND->crl,
-                              SSL_SET_OPTION(CRLfile));
-
-    if(ret) {
-      error_strerror(ret, errorbuf, sizeof(errorbuf));
-      failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s",
-            SSL_SET_OPTION(CRLfile), -ret, errorbuf);
-
-      return CURLE_SSL_CRL_BADFILE;
-    }
-  }
-
-  infof(data, "PolarSSL: Connecting to %s:%d\n", hostname, port);
-
-  if(ssl_init(&BACKEND->ssl)) {
-    failf(data, "PolarSSL: ssl_init failed");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  switch(SSL_CONN_CONFIG(version)) {
-  case CURL_SSLVERSION_DEFAULT:
-  case CURL_SSLVERSION_TLSv1:
-    ssl_set_min_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3,
-                        SSL_MINOR_VERSION_1);
-    break;
-  case CURL_SSLVERSION_SSLv3:
-    ssl_set_min_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3,
-                        SSL_MINOR_VERSION_0);
-    ssl_set_max_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3,
-                        SSL_MINOR_VERSION_0);
-    infof(data, "PolarSSL: Forced min. SSL Version to be SSLv3\n");
-    break;
-  case CURL_SSLVERSION_TLSv1_0:
-  case CURL_SSLVERSION_TLSv1_1:
-  case CURL_SSLVERSION_TLSv1_2:
-  case CURL_SSLVERSION_TLSv1_3:
-    {
-      CURLcode result = set_ssl_version_min_max(conn, sockindex);
-      if(result != CURLE_OK)
-        return result;
-      break;
-    }
-  default:
-    failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  ssl_set_endpoint(&BACKEND->ssl, SSL_IS_CLIENT);
-  ssl_set_authmode(&BACKEND->ssl, SSL_VERIFY_OPTIONAL);
-
-  ssl_set_rng(&BACKEND->ssl, ctr_drbg_random,
-              &BACKEND->ctr_drbg);
-  ssl_set_bio(&BACKEND->ssl,
-              net_recv, &conn->sock[sockindex],
-              net_send, &conn->sock[sockindex]);
-
-  ssl_set_ciphersuites(&BACKEND->ssl, ssl_list_ciphersuites());
-
-  /* Check if there's a cached ID we can/should use here! */
-  if(SSL_SET_OPTION(primary.sessionid)) {
-    void *old_session = NULL;
-
-    Curl_ssl_sessionid_lock(conn);
-    if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
-      ret = ssl_set_session(&BACKEND->ssl, old_session);
-      if(ret) {
-        Curl_ssl_sessionid_unlock(conn);
-        failf(data, "ssl_set_session returned -0x%x", -ret);
-        return CURLE_SSL_CONNECT_ERROR;
-      }
-      infof(data, "PolarSSL re-using session\n");
-    }
-    Curl_ssl_sessionid_unlock(conn);
-  }
-
-  ssl_set_ca_chain(&BACKEND->ssl,
-                   &BACKEND->cacert,
-                   &BACKEND->crl,
-                   hostname);
-
-  ssl_set_own_cert_rsa(&BACKEND->ssl,
-                       &BACKEND->clicert, &BACKEND->rsa);
-
-  if(ssl_set_hostname(&BACKEND->ssl, hostname)) {
-    /* ssl_set_hostname() sets the name to use in CN/SAN checks *and* the name
-       to set in the SNI extension. So even if curl connects to a host
-       specified as an IP address, this function must be used. */
-    failf(data, "couldn't set hostname in PolarSSL");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-#ifdef HAS_ALPN
-  if(conn->bits.tls_enable_alpn) {
-    static const char *protocols[3];
-    int cur = 0;
-
-#ifdef USE_NGHTTP2
-    if(data->set.httpversion >= CURL_HTTP_VERSION_2) {
-      protocols[cur++] = NGHTTP2_PROTO_VERSION_ID;
-      infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
-    }
-#endif
-
-    protocols[cur++] = ALPN_HTTP_1_1;
-    infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1);
-
-    protocols[cur] = NULL;
-
-    ssl_set_alpn_protocols(&BACKEND->ssl, protocols);
-  }
-#endif
-
-#ifdef POLARSSL_DEBUG
-  ssl_set_dbg(&BACKEND->ssl, polarssl_debug, data);
-#endif
-
-  connssl->connecting_state = ssl_connect_2;
-
-  return CURLE_OK;
-}
-
-static CURLcode
-polarssl_connect_step2(struct connectdata *conn,
-                       int sockindex)
-{
-  int ret;
-  struct Curl_easy *data = conn->data;
-  struct ssl_connect_data* connssl = &conn->ssl[sockindex];
-  char buffer[1024];
-  const char * const pinnedpubkey = SSL_IS_PROXY() ?
-            data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
-            data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
-
-
-  char errorbuf[128];
-  errorbuf[0] = 0;
-
-  conn->recv[sockindex] = polarssl_recv;
-  conn->send[sockindex] = polarssl_send;
-
-  ret = ssl_handshake(&BACKEND->ssl);
-
-  switch(ret) {
-  case 0:
-    break;
-
-  case POLARSSL_ERR_NET_WANT_READ:
-    connssl->connecting_state = ssl_connect_2_reading;
-    return CURLE_OK;
-
-  case POLARSSL_ERR_NET_WANT_WRITE:
-    connssl->connecting_state = ssl_connect_2_writing;
-    return CURLE_OK;
-
-  default:
-    error_strerror(ret, errorbuf, sizeof(errorbuf));
-    failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s",
-          -ret, errorbuf);
-    return CURLE_SSL_CONNECT_ERROR;
-  }
-
-  infof(data, "PolarSSL: Handshake complete, cipher is %s\n",
-        ssl_get_ciphersuite(&BACKEND->ssl) );
-
-  ret = ssl_get_verify_result(&BACKEND->ssl);
-
-  if(ret && SSL_CONN_CONFIG(verifypeer)) {
-    if(ret & BADCERT_EXPIRED)
-      failf(data, "Cert verify failed: BADCERT_EXPIRED");
-
-    if(ret & BADCERT_REVOKED) {
-      failf(data, "Cert verify failed: BADCERT_REVOKED");
-      return CURLE_PEER_FAILED_VERIFICATION;
-    }
-
-    if(ret & BADCERT_CN_MISMATCH)
-      failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
-
-    if(ret & BADCERT_NOT_TRUSTED)
-      failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
-
-    return CURLE_PEER_FAILED_VERIFICATION;
-  }
-
-  if(ssl_get_peer_cert(&(BACKEND->ssl))) {
-    /* If the session was resumed, there will be no peer certs */
-    memset(buffer, 0, sizeof(buffer));
-
-    if(x509_crt_info(buffer, sizeof(buffer), (char *)"* ",
-                     ssl_get_peer_cert(&(BACKEND->ssl))) != -1)
-      infof(data, "Dumping cert info:\n%s\n", buffer);
-  }
-
-  /* adapted from mbedtls.c */
-  if(pinnedpubkey) {
-    int size;
-    CURLcode result;
-    x509_crt *p;
-    unsigned char pubkey[PUB_DER_MAX_BYTES];
-    const x509_crt *peercert;
-
-    peercert = ssl_get_peer_cert(&BACKEND->ssl);
-
-    if(!peercert || !peercert->raw.p || !peercert->raw.len) {
-      failf(data, "Failed due to missing peer certificate");
-      return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
-    }
-
-    p = calloc(1, sizeof(*p));
-
-    if(!p)
-      return CURLE_OUT_OF_MEMORY;
-
-    x509_crt_init(p);
-
-    /* Make a copy of our const peercert because pk_write_pubkey_der
-       needs a non-const key, for now.
-       https://github.com/ARMmbed/mbedtls/issues/396 */
-    if(x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
-      failf(data, "Failed copying peer certificate");
-      x509_crt_free(p);
-      free(p);
-      return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
-    }
-
-    size = pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
-
-    if(size <= 0) {
-      failf(data, "Failed copying public key from peer certificate");
-      x509_crt_free(p);
-      free(p);
-      return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
-    }
-
-    /* pk_write_pubkey_der writes data at the end of the buffer. */
-    result = Curl_pin_peer_pubkey(data,
-                                  pinnedpubkey,
-                                  &pubkey[PUB_DER_MAX_BYTES - size], size);
-    if(result) {
-      x509_crt_free(p);
-      free(p);
-      return result;
-    }
-
-    x509_crt_free(p);
-    free(p);
-  }
-
-#ifdef HAS_ALPN
-  if(conn->bits.tls_enable_alpn) {
-    const char *next_protocol = ssl_get_alpn_protocol(&BACKEND->ssl);
-
-    if(next_protocol != NULL) {
-      infof(data, "ALPN, server accepted to use %s\n", next_protocol);
-
-#ifdef USE_NGHTTP2
-      if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
-                  NGHTTP2_PROTO_VERSION_ID_LEN)) {
-        conn->negnpn = CURL_HTTP_VERSION_2;
-      }
-      else
-#endif
-        if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) {
-          conn->negnpn = CURL_HTTP_VERSION_1_1;
-        }
-    }
-    else
-      infof(data, "ALPN, server did not agree to a protocol\n");
-    Curl_multiuse_state(conn, conn->negnpn == CURL_HTTP_VERSION_2 ?
-                        BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
-  }
-#endif
-
-  connssl->connecting_state = ssl_connect_3;
-  infof(data, "SSL connected\n");
-
-  return CURLE_OK;
-}
-
-static CURLcode
-polarssl_connect_step3(struct connectdata *conn,
-                       int sockindex)
-{
-  CURLcode retcode = CURLE_OK;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  struct Curl_easy *data = conn->data;
-
-  DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
-
-  if(SSL_SET_OPTION(primary.sessionid)) {
-    int ret;
-    ssl_session *our_ssl_sessionid;
-    void *old_ssl_sessionid = NULL;
-
-    our_ssl_sessionid = calloc(1, sizeof(ssl_session));
-    if(!our_ssl_sessionid)
-      return CURLE_OUT_OF_MEMORY;
-
-    ret = ssl_get_session(&BACKEND->ssl, our_ssl_sessionid);
-    if(ret) {
-      failf(data, "ssl_get_session returned -0x%x", -ret);
-      return CURLE_SSL_CONNECT_ERROR;
-    }
-
-    /* If there's already a matching session in the cache, delete it */
-    Curl_ssl_sessionid_lock(conn);
-    if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
-      Curl_ssl_delsessionid(conn, old_ssl_sessionid);
-
-    retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
-    Curl_ssl_sessionid_unlock(conn);
-    if(retcode) {
-      free(our_ssl_sessionid);
-      failf(data, "failed to store ssl session");
-      return retcode;
-    }
-  }
-
-  connssl->connecting_state = ssl_connect_done;
-
-  return CURLE_OK;
-}
-
-static ssize_t polarssl_send(struct connectdata *conn,
-                             int sockindex,
-                             const void *mem,
-                             size_t len,
-                             CURLcode *curlcode)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  int ret = -1;
-
-  ret = ssl_write(&BACKEND->ssl,
-                  (unsigned char *)mem, len);
-
-  if(ret < 0) {
-    *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ?
-      CURLE_AGAIN : CURLE_SEND_ERROR;
-    ret = -1;
-  }
-
-  return ret;
-}
-
-static void Curl_polarssl_close(struct connectdata *conn, int sockindex)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  rsa_free(&BACKEND->rsa);
-  x509_crt_free(&BACKEND->clicert);
-  x509_crt_free(&BACKEND->cacert);
-  x509_crl_free(&BACKEND->crl);
-  ssl_free(&BACKEND->ssl);
-}
-
-static ssize_t polarssl_recv(struct connectdata *conn,
-                             int num,
-                             char *buf,
-                             size_t buffersize,
-                             CURLcode *curlcode)
-{
-  struct ssl_connect_data *connssl = &conn->ssl[num];
-  int ret = -1;
-  ssize_t len = -1;
-
-  memset(buf, 0, buffersize);
-  ret = ssl_read(&BACKEND->ssl, (unsigned char *)buf, buffersize);
-
-  if(ret <= 0) {
-    if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
-      return 0;
-
-    *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ?
-      CURLE_AGAIN : CURLE_RECV_ERROR;
-    return -1;
-  }
-
-  len = ret;
-
-  return len;
-}
-
-static void Curl_polarssl_session_free(void *ptr)
-{
-  ssl_session_free(ptr);
-  free(ptr);
-}
-
-/* 1.3.10 was the first rebranded version. All new releases (in 1.3 branch and
-   higher) will be mbed TLS branded.. */
-
-static size_t Curl_polarssl_version(char *buffer, size_t size)
-{
-  unsigned int version = version_get_number();
-  return msnprintf(buffer, size, "%s/%d.%d.%d",
-                   version >= 0x01030A00?"mbedTLS":"PolarSSL",
-                   version>>24, (version>>16)&0xff, (version>>8)&0xff);
-}
-
-static CURLcode
-polarssl_connect_common(struct connectdata *conn,
-                        int sockindex,
-                        bool nonblocking,
-                        bool *done)
-{
-  CURLcode result;
-  struct Curl_easy *data = conn->data;
-  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  curl_socket_t sockfd = conn->sock[sockindex];
-  timediff_t timeout_ms;
-  int what;
-
-  /* check if the connection has already been established */
-  if(ssl_connection_complete == connssl->state) {
-    *done = TRUE;
-    return CURLE_OK;
-  }
-
-  if(ssl_connect_1 == connssl->connecting_state) {
-    /* Find out how much more time we're allowed */
-    timeout_ms = Curl_timeleft(data, NULL, TRUE);
-
-    if(timeout_ms < 0) {
-      /* no need to continue if time already is up */
-      failf(data, "SSL connection timeout");
-      return CURLE_OPERATION_TIMEDOUT;
-    }
-
-    result = polarssl_connect_step1(conn, sockindex);
-    if(result)
-      return result;
-  }
-
-  while(ssl_connect_2 == connssl->connecting_state ||
-        ssl_connect_2_reading == connssl->connecting_state ||
-        ssl_connect_2_writing == connssl->connecting_state) {
-
-    /* check allowed time left */
-    timeout_ms = Curl_timeleft(data, NULL, TRUE);
-
-    if(timeout_ms < 0) {
-      /* no need to continue if time already is up */
-      failf(data, "SSL connection timeout");
-      return CURLE_OPERATION_TIMEDOUT;
-    }
-
-    /* if ssl is expecting something, check if it's available. */
-    if(connssl->connecting_state == ssl_connect_2_reading ||
-       connssl->connecting_state == ssl_connect_2_writing) {
-
-      curl_socket_t writefd = ssl_connect_2_writing ==
-        connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
-      curl_socket_t readfd = ssl_connect_2_reading ==
-        connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
-
-      what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
-                               nonblocking?0:(time_t)timeout_ms);
-      if(what < 0) {
-        /* fatal error */
-        failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
-        return CURLE_SSL_CONNECT_ERROR;
-      }
-      else if(0 == what) {
-        if(nonblocking) {
-          *done = FALSE;
-          return CURLE_OK;
-        }
-        else {
-          /* timeout */
-          failf(data, "SSL connection timeout");
-          return CURLE_OPERATION_TIMEDOUT;
-        }
-      }
-      /* socket is readable or writable */
-    }
-
-    /* Run transaction, and return to the caller if it failed or if
-     * this connection is part of a multi handle and this loop would
-     * execute again. This permits the owner of a multi handle to
-     * abort a connection attempt before step2 has completed while
-     * ensuring that a client using select() or epoll() will always
-     * have a valid fdset to wait on.
-     */
-    result = polarssl_connect_step2(conn, sockindex);
-    if(result || (nonblocking &&
-                  (ssl_connect_2 == connssl->connecting_state ||
-                   ssl_connect_2_reading == connssl->connecting_state ||
-                   ssl_connect_2_writing == connssl->connecting_state)))
-      return result;
-
-  } /* repeat step2 until all transactions are done. */
-
-  if(ssl_connect_3 == connssl->connecting_state) {
-    result = polarssl_connect_step3(conn, sockindex);
-    if(result)
-      return result;
-  }
-
-  if(ssl_connect_done == connssl->connecting_state) {
-    connssl->state = ssl_connection_complete;
-    conn->recv[sockindex] = polarssl_recv;
-    conn->send[sockindex] = polarssl_send;
-    *done = TRUE;
-  }
-  else
-    *done = FALSE;
-
-  /* Reset our connect state machine */
-  connssl->connecting_state = ssl_connect_1;
-
-  return CURLE_OK;
-}
-
-static CURLcode Curl_polarssl_connect_nonblocking(struct connectdata *conn,
-                                                  int sockindex, bool *done)
-{
-  return polarssl_connect_common(conn, sockindex, TRUE, done);
-}
-
-
-static CURLcode Curl_polarssl_connect(struct connectdata *conn, int sockindex)
-{
-  CURLcode result;
-  bool done = FALSE;
-
-  result = polarssl_connect_common(conn, sockindex, FALSE, &done);
-  if(result)
-    return result;
-
-  DEBUGASSERT(done);
-
-  return CURLE_OK;
-}
-
-/*
- * return 0 error initializing SSL
- * return 1 SSL initialized successfully
- */
-static int Curl_polarssl_init(void)
-{
-  return Curl_polarsslthreadlock_thread_setup();
-}
-
-static void Curl_polarssl_cleanup(void)
-{
-  (void)Curl_polarsslthreadlock_thread_cleanup();
-}
-
-static bool Curl_polarssl_data_pending(const struct connectdata *conn,
-                                       int sockindex)
-{
-  const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
-  return ssl_get_bytes_avail(&BACKEND->ssl) != 0;
-}
-
-static CURLcode Curl_polarssl_sha256sum(const unsigned char *input,
-                                    size_t inputlen,
-                                    unsigned char *sha256sum,
-                                    size_t sha256len UNUSED_PARAM)
-{
-  (void)sha256len;
-  sha256(input, inputlen, sha256sum, 0);
-  return CURLE_OK;
-}
-
-static void *Curl_polarssl_get_internals(struct ssl_connect_data *connssl,
-                                         CURLINFO info UNUSED_PARAM)
-{
-  (void)info;
-  return &BACKEND->ssl;
-}
-
-const struct Curl_ssl Curl_ssl_polarssl = {
-  { CURLSSLBACKEND_POLARSSL, "polarssl" }, /* info */
-
-  SSLSUPP_CA_PATH |
-  SSLSUPP_PINNEDPUBKEY,
-
-  sizeof(struct ssl_backend_data),
-
-  Curl_polarssl_init,                /* init */
-  Curl_polarssl_cleanup,             /* cleanup */
-  Curl_polarssl_version,             /* version */
-  Curl_none_check_cxn,               /* check_cxn */
-  Curl_none_shutdown,                /* shutdown */
-  Curl_polarssl_data_pending,        /* data_pending */
-  /* This might cause libcurl to use a weeker random! */
-  Curl_none_random,                  /* random */
-  Curl_none_cert_status_request,     /* cert_status_request */
-  Curl_polarssl_connect,             /* connect */
-  Curl_polarssl_connect_nonblocking, /* connect_nonblocking */
-  Curl_polarssl_get_internals,       /* get_internals */
-  Curl_polarssl_close,               /* close_one */
-  Curl_none_close_all,               /* close_all */
-  Curl_polarssl_session_free,        /* session_free */
-  Curl_none_set_engine,              /* set_engine */
-  Curl_none_set_engine_default,      /* set_engine_default */
-  Curl_none_engines_list,            /* engines_list */
-  Curl_none_false_start,             /* false_start */
-  Curl_none_md5sum,                  /* md5sum */
-  Curl_polarssl_sha256sum            /* sha256sum */
-};
-
-#endif /* USE_POLARSSL */
diff --git a/lib/vtls/polarssl.h b/lib/vtls/polarssl.h
deleted file mode 100644
index f36f24f8d..000000000
--- a/lib/vtls/polarssl.h
+++ /dev/null
@@ -1,32 +0,0 @@
-#ifndef HEADER_CURL_POLARSSL_H
-#define HEADER_CURL_POLARSSL_H
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
- * Copyright (C) 2010, Hoi-Ho Chan, <hoiho.chan@gmail.com>
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-#include "curl_setup.h"
-
-#ifdef USE_POLARSSL
-
-extern const struct Curl_ssl Curl_ssl_polarssl;
-
-#endif /* USE_POLARSSL */
-#endif /* HEADER_CURL_POLARSSL_H */
diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index 50e7a63a9..dfefa1bd5 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -516,7 +516,7 @@ void Curl_ssl_close_all(struct Curl_easy *data)
 }
 
 #if defined(USE_OPENSSL) || defined(USE_GNUTLS) || defined(USE_SCHANNEL) || \
-  defined(USE_SECTRANSP) || defined(USE_POLARSSL) || defined(USE_NSS) || \
+  defined(USE_SECTRANSP) || defined(USE_NSS) || \
   defined(USE_MBEDTLS) || defined(USE_WOLFSSL) || defined(USE_BEARSSL)
 int Curl_ssl_getsock(struct connectdata *conn, curl_socket_t *socks)
 {
@@ -1183,8 +1183,6 @@ const struct Curl_ssl *Curl_ssl =
   &Curl_ssl_nss;
 #elif defined(USE_OPENSSL)
   &Curl_ssl_openssl;
-#elif defined(USE_POLARSSL)
-  &Curl_ssl_polarssl;
 #elif defined(USE_SCHANNEL)
   &Curl_ssl_schannel;
 #elif defined(USE_MESALINK)
@@ -1217,9 +1215,6 @@ static const struct Curl_ssl *available_backends[] = {
 #if defined(USE_OPENSSL)
   &Curl_ssl_openssl,
 #endif
-#if defined(USE_POLARSSL)
-  &Curl_ssl_polarssl,
-#endif
 #if defined(USE_SCHANNEL)
   &Curl_ssl_schannel,
 #endif
diff --git a/lib/vtls/vtls.h b/lib/vtls/vtls.h
index 976cc4360..f58adee6e 100644
--- a/lib/vtls/vtls.h
+++ b/lib/vtls/vtls.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -102,7 +102,6 @@ CURLcode Curl_none_md5sum(unsigned char *input, size_t inputlen,
 #include "gtls.h"           /* GnuTLS versions */
 #include "nssg.h"           /* NSS versions */
 #include "gskit.h"          /* Global Secure ToolKit versions */
-#include "polarssl.h"       /* PolarSSL versions */
 #include "wolfssl.h"        /* wolfSSL versions */
 #include "schannel.h"       /* Schannel SSPI version */
 #include "sectransp.h"      /* SecureTransport (Darwin) version */