libtorrent: add support for openssl 1.1

Used a patch that was merged upstream.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

libs/libtorrent/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libtorrent
 PKG_VERSION:=0.13.6-git-1
-PKG_RELEASE=$(PKG_SOURCE_VERSION)
+PKG_RELEASE=$(PKG_SOURCE_VERSION).1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/rakshasa/libtorrent.git

libs/libtorrent/patches/110-openssl-1.1.patch

@@ -0,0 +1,105 @@
+From 4607bbf78040789dee29266878ce109136b984ef Mon Sep 17 00:00:00 2001
+From: rakshasa <sundell.software@gmail.com>
+Date: Tue, 20 Dec 2016 19:51:02 +0900
+Subject: [PATCH] Added support for openssl 1.1.
+
+---
+ configure.ac                |  4 ++++
+ src/utils/diffie_hellman.cc | 36 ++++++++++++++++++++++++++++++++++--
+ 2 files changed, 38 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 65e34872..27e33570 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -69,12 +69,15 @@ AC_ARG_ENABLE(openssl,
+   [  --disable-openssl       Don't use OpenSSL's SHA1 implementation.],
+   [
+     if test "$enableval" = "yes"; then
++dnl move to scripts.
+       PKG_CHECK_MODULES(OPENSSL, libcrypto,
+         CXXFLAGS="$CXXFLAGS $OPENSSL_CFLAGS";
+         LIBS="$LIBS $OPENSSL_LIBS")
+ 
+       AC_DEFINE(USE_OPENSSL, 1, Using OpenSSL.)
+       AC_DEFINE(USE_OPENSSL_SHA, 1, Using OpenSSL's SHA1 implementation.)
++      AC_CHECK_LIB([crypto], [DH_set0_pqg], [AC_DEFINE(USE_OPENSSL_1_1, 1, Using OpenSSL 1.1.)])
++
+     else
+       AC_DEFINE(USE_NSS_SHA, 1, Using Mozilla's SHA1 implementation.)
+     fi
+@@ -85,6 +88,7 @@ AC_ARG_ENABLE(openssl,
+ 
+     AC_DEFINE(USE_OPENSSL, 1, Using OpenSSL.)
+     AC_DEFINE(USE_OPENSSL_SHA, 1, Using OpenSSL's SHA1 implementation.)
++    AC_CHECK_LIB([crypto], [DH_set0_pqg], [AC_DEFINE(USE_OPENSSL_1_1, 1, Using OpenSSL 1.1.)])
+   ]
+ )
+ 
+diff --git a/src/utils/diffie_hellman.cc b/src/utils/diffie_hellman.cc
+index aa653d45..7ec13165 100644
+--- a/src/utils/diffie_hellman.cc
++++ b/src/utils/diffie_hellman.cc
+@@ -54,11 +54,23 @@ DiffieHellman::DiffieHellman(const unsigned char *prime, int primeLength,
+   m_secret(NULL), m_size(0) {
+ 
+ #ifdef USE_OPENSSL
++
+   m_dh = DH_new();
++
++#ifdef USE_OPENSSL_1_1
++  BIGNUM * const dh_p = BN_bin2bn(prime, primeLength, NULL);
++  BIGNUM * const dh_g = BN_bin2bn(generator, generatorLength, NULL);
++
++  if (dh_p == NULL || dh_g == NULL ||
++      !DH_set0_pqg(m_dh, dh_p, NULL, dh_g))
++	  throw internal_error("Could not generate Diffie-Hellman parameters");
++#else
+   m_dh->p = BN_bin2bn(prime, primeLength, NULL);
+   m_dh->g = BN_bin2bn(generator, generatorLength, NULL);
++#endif
+ 
+   DH_generate_key(m_dh);
++
+ #else
+   throw internal_error("Compiled without encryption support.");
+ #endif
+@@ -74,7 +86,19 @@ DiffieHellman::~DiffieHellman() {
+ bool
+ DiffieHellman::is_valid() const {
+ #ifdef USE_OPENSSL
++  if (m_dh == NULL)
++    return false;
++
++#ifdef USE_OPENSSL_1_1
++  const BIGNUM *pub_key;
++
++  DH_get0_key(m_dh, &pub_key, NULL);
++
++  return pub_key != NULL;
++#else
+   return m_dh != NULL && m_dh->pub_key != NULL;
++#endif
++
+ #else
+   return false;
+ #endif
+@@ -103,8 +127,16 @@ DiffieHellman::store_pub_key(unsigned char* dest, unsigned int length) {
+ #ifdef USE_OPENSSL
+   std::memset(dest, 0, length);
+ 
+-  if ((int)length >= BN_num_bytes(m_dh->pub_key))
+-    BN_bn2bin(m_dh->pub_key, dest + length - BN_num_bytes(m_dh->pub_key));
++  const BIGNUM *pub_key;
++
++#ifdef USE_OPENSSL_1_1
++  DH_get0_key(m_dh, &pub_key, NULL);
++#else
++  pub_key = m_dh->pub_key;
++#endif
++
++  if ((int)length >= BN_num_bytes(pub_key))
++    BN_bn2bin(pub_key, dest + length - BN_num_bytes(pub_key));
+ #endif
+ }
+