diff --git a/include/libtorrent/hasher.hpp b/include/libtorrent/hasher.hpp
index c7e4a91cf..745cdb089 100644
--- a/include/libtorrent/hasher.hpp
+++ b/include/libtorrent/hasher.hpp
@@ -75,6 +75,8 @@ namespace libtorrent
 		{
 #ifdef TORRENT_USE_GCRYPT
 			gcry_md_open(&m_context, GCRY_MD_SHA1, 0);
+#elif defined TORRENT_USE_OPENSSL
+			SHA1_Init(&m_context);
 #else
 			SHA1_init(&m_context);
 #endif
@@ -86,6 +88,9 @@ namespace libtorrent
 #ifdef TORRENT_USE_GCRYPT
 			gcry_md_open(&m_context, GCRY_MD_SHA1, 0);
 			gcry_md_write(m_context, data, len);
+#elif defined TORRENT_USE_OPENSSL
+			SHA1_Init(&m_context);
+			SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
 #else
 			SHA1_init(&m_context);
 			SHA1_update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
@@ -113,6 +118,8 @@ namespace libtorrent
 			TORRENT_ASSERT(len > 0);
 #ifdef TORRENT_USE_GCRYPT
 			gcry_md_write(m_context, data, len);
+#elif defined TORRENT_USE_OPENSSL
+			SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
 #else
 			SHA1_update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
 #endif
@@ -124,6 +131,8 @@ namespace libtorrent
 #ifdef TORRENT_USE_GCRYPT
 			gcry_md_final(m_context);
 			digest.assign((const char*)gcry_md_read(m_context, 0));
+#elif defined TORRENT_USE_OPENSSL
+			SHA1_Final(digest.begin(), &m_context);
 #else
 			SHA1_final(digest.begin(), &m_context);
 #endif
@@ -134,6 +143,8 @@ namespace libtorrent
 		{
 #ifdef TORRENT_USE_GCRYPT
 			gcry_md_reset(m_context);
+#elif defined TORRENT_USE_OPENSSL
+			SHA1_Init(&m_context);
 #else
 			SHA1_init(&m_context);
 #endif
@@ -150,6 +161,8 @@ namespace libtorrent
 
 #ifdef TORRENT_USE_GCRYPT
 		gcry_md_hd_t m_context;
+#elif defined TORRENT_USE_OPENSSL
+		SHA_CTX m_context;
 #else
 		sha_ctx m_context;
 #endif