From 0bb0ed5712eaa274c0e025c74fe792c56c5c8c7f Mon Sep 17 00:00:00 2001
From: Zuzana Svetlikova <zsvetlik@redhat.com>
Date: Wed, 19 Feb 2020 09:33:47 +0000
Subject: [PATCH] Remove or backport OpenSSL features

Signed-off-by: rpm-build <rpm-build>
---
 doc/api/cli.md                |  26 --
 lib/_tls_common.js            |   2 +-
 lib/internal/crypto/keygen.js |   8 +-
 lib/tls.js                    |   9 +-
 src/env.h                     |   1 -
 src/node_constants.cc         |  12 +-
 src/node_crypto.cc            | 461 +++++++++++++++++++++++++++++++---
 src/node_crypto.h             |  77 ++++++
 src/node_crypto_bio.cc        |  29 ++-
 src/node_crypto_common.cc     |  32 ++-
 src/node_crypto_common.h      |   2 +
 src/node_errors.h             |   4 +-
 src/node_options.cc           |   4 +
 src/tls_wrap.cc               |   2 +
 14 files changed, 592 insertions(+), 77 deletions(-)

diff --git a/doc/api/cli.md b/doc/api/cli.md
index 5dd5ae4..2ea0732 100644
--- a/doc/api/cli.md
+++ b/doc/api/cli.md
@@ -753,15 +753,6 @@ added: v4.0.0
 Specify an alternative default TLS cipher list. Requires Node.js to be built
 with crypto support (default).
 
-### `--tls-keylog=file`
-<!-- YAML
-added: v12.16.0
--->
-
-Log TLS key material to a file. The key material is in NSS `SSLKEYLOGFILE`
-format and can be used by software (such as Wireshark) to decrypt the TLS
-traffic.
-
 ### `--tls-max-v1.2`
 <!-- YAML
 added: v12.0.0
@@ -770,14 +761,6 @@ added: v12.0.0
 Set [`tls.DEFAULT_MAX_VERSION`][] to 'TLSv1.2'. Use to disable support for
 TLSv1.3.
 
-### `--tls-max-v1.3`
-<!-- YAML
-added: v12.0.0
--->
-
-Set default [`tls.DEFAULT_MAX_VERSION`][] to 'TLSv1.3'. Use to enable support
-for TLSv1.3.
-
 ### `--tls-min-v1.0`
 <!-- YAML
 added: v12.0.0
@@ -803,14 +786,6 @@ Set default [`tls.DEFAULT_MIN_VERSION`][] to 'TLSv1.2'. This is the default for
 12.x and later, but the option is supported for compatibility with older Node.js
 versions.
 
-### `--tls-min-v1.3`
-<!-- YAML
-added: v12.0.0
--->
-
-Set default [`tls.DEFAULT_MIN_VERSION`][] to 'TLSv1.3'. Use to disable support
-for TLSv1.2, which is not as secure as TLSv1.3.
-
 ### `--trace-deprecation`
 <!-- YAML
 added: v0.8.0
@@ -1190,7 +1165,6 @@ Node.js options that are allowed are:
 * `--throw-deprecation`
 * `--title`
 * `--tls-cipher-list`
-* `--tls-keylog`
 * `--tls-max-v1.2`
 * `--tls-max-v1.3`
 * `--tls-min-v1.0`
diff --git a/lib/_tls_common.js b/lib/_tls_common.js
index 9f7747c..32e4a77 100644
--- a/lib/_tls_common.js
+++ b/lib/_tls_common.js
@@ -52,7 +52,7 @@ function toV(which, v, def) {
   if (v === 'TLSv1') return TLS1_VERSION;
   if (v === 'TLSv1.1') return TLS1_1_VERSION;
   if (v === 'TLSv1.2') return TLS1_2_VERSION;
-  if (v === 'TLSv1.3') return TLS1_3_VERSION;
+  if (v === 'TLSv1.3' && TLS1_3_VERSION) return TLS1_3_VERSION;
   throw new ERR_TLS_INVALID_PROTOCOL_VERSION(v, which);
 }
 
diff --git a/lib/internal/crypto/keygen.js b/lib/internal/crypto/keygen.js
index ced1a06..a8a6897 100644
--- a/lib/internal/crypto/keygen.js
+++ b/lib/internal/crypto/keygen.js
@@ -12,10 +12,10 @@ const {
   generateKeyPairEC,
   generateKeyPairNid,
   generateKeyPairDH,
-  EVP_PKEY_ED25519,
-  EVP_PKEY_ED448,
-  EVP_PKEY_X25519,
-  EVP_PKEY_X448,
+  // EVP_PKEY_ED25519,
+  // EVP_PKEY_ED448,
+  // EVP_PKEY_X25519,
+  // EVP_PKEY_X448,
   OPENSSL_EC_NAMED_CURVE,
   OPENSSL_EC_EXPLICIT_CURVE
 } = internalBinding('crypto');
diff --git a/lib/tls.js b/lib/tls.js
index 2ccbe40..ea5f7c9 100644
--- a/lib/tls.js
+++ b/lib/tls.js
@@ -66,17 +66,10 @@ else if (getOptionValue('--tls-min-v1.1'))
   exports.DEFAULT_MIN_VERSION = 'TLSv1.1';
 else if (getOptionValue('--tls-min-v1.2'))
   exports.DEFAULT_MIN_VERSION = 'TLSv1.2';
-else if (getOptionValue('--tls-min-v1.3'))
-  exports.DEFAULT_MIN_VERSION = 'TLSv1.3';
 else
   exports.DEFAULT_MIN_VERSION = 'TLSv1.2';
 
-if (getOptionValue('--tls-max-v1.3'))
-  exports.DEFAULT_MAX_VERSION = 'TLSv1.3';
-else if (getOptionValue('--tls-max-v1.2'))
-  exports.DEFAULT_MAX_VERSION = 'TLSv1.2';
-else
-  exports.DEFAULT_MAX_VERSION = 'TLSv1.3'; // Will depend on node version.
+exports.DEFAULT_MAX_VERSION = 'TLSv1.2'; // Will depend on node version.
 
 
 exports.getCiphers = internalUtil.cachedResult(
diff --git a/src/env.h b/src/env.h
index 6de5ba9..5731afe 100644
--- a/src/env.h
+++ b/src/env.h
@@ -261,7 +261,6 @@ constexpr size_t kFsStatsBufferLength =
   V(host_string, "host")                                                       \
   V(hostmaster_string, "hostmaster")                                           \
   V(http_1_1_string, "http/1.1")                                               \
-  V(identity_string, "identity")                                               \
   V(ignore_string, "ignore")                                                   \
   V(infoaccess_string, "infoAccess")                                           \
   V(inherit_string, "inherit")                                                 \
diff --git a/src/node_constants.cc b/src/node_constants.cc
index 5d99fa1..eff87ee 100644
--- a/src/node_constants.cc
+++ b/src/node_constants.cc
@@ -956,8 +956,12 @@ void DefineCryptoConstants(Local<Object> target) {
     NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_RAND);
 # endif
 
-# ifdef ENGINE_METHOD_EC
-    NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_EC);
+# ifdef ENGINE_METHOD_ECDH
+    NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_ECDH);
+# endif
+
+# ifdef ENGINE_METHOD_ECDSA
+    NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_ECDSA);
 # endif
 
 # ifdef ENGINE_METHOD_CIPHERS
@@ -968,6 +972,10 @@ void DefineCryptoConstants(Local<Object> target) {
     NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_DIGESTS);
 # endif
 
+# ifdef ENGINE_METHOD_STORE
+    NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_STORE);
+# endif
+
 # ifdef ENGINE_METHOD_PKEY_METHS
     NODE_DEFINE_CONSTANT(target, ENGINE_METHOD_PKEY_METHS);
 # endif
diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index f08d68d..34fb29d 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -56,6 +56,7 @@
 #include <cstring>
 
 #include <algorithm>
+#include <atomic>
 #include <memory>
 #include <utility>
 #include <vector>
@@ -105,6 +106,213 @@ using v8::Value;
 # define IS_OCB_MODE(mode) ((mode) == EVP_CIPH_OCB_MODE)
 #endif
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+static void DH_get0_pqg(const DH* dh, const BIGNUM** p, const BIGNUM** q,
+                        const BIGNUM** g) {
+  if (p != nullptr) {
+    *p = dh->p;
+  }
+  if (q != nullptr) {
+    *q = dh->q;
+  }
+  if (g != nullptr) {
+    *g = dh->g;
+  }
+}
+
+static int DH_set0_pqg(DH* dh, BIGNUM* p, BIGNUM* q, BIGNUM* g) {
+  if ((dh->p == nullptr && p == nullptr) ||
+      (dh->g == nullptr && g == nullptr)) {
+    return 0;
+  }
+
+  if (p != nullptr) {
+    BN_free(dh->p);
+    dh->p = p;
+  }
+  if (q != nullptr) {
+    BN_free(dh->q);
+    dh->q = q;
+  }
+  if (g != nullptr) {
+    BN_free(dh->g);
+    dh->g = g;
+  }
+
+  return 1;
+}
+
+static void DH_get0_key(const DH* dh, const BIGNUM** pub_key,
+                        const BIGNUM** priv_key) {
+  if (pub_key != nullptr) {
+    *pub_key = dh->pub_key;
+  }
+  if (priv_key != nullptr) {
+    *priv_key = dh->priv_key;
+  }
+}
+
+static int DH_set0_key(DH* dh, BIGNUM* pub_key, BIGNUM* priv_key) {
+  if (pub_key != nullptr) {
+    BN_free(dh->pub_key);
+    dh->pub_key = pub_key;
+  }
+  if (priv_key != nullptr) {
+    BN_free(dh->priv_key);
+    dh->priv_key = priv_key;
+  }
+
+  return 1;
+}
+
+static int EVP_PKEY_up_ref(EVP_PKEY *pkey) {
+  int refcount = std::atomic_fetch_add_explicit(
+    reinterpret_cast<std::atomic<int>*>(&pkey->references),
+    1,
+    std::memory_order_relaxed
+  ) + 1;
+  return (refcount > 1) ? 1 : 0;
+}
+static unsigned long EVP_MD_meth_get_flags(const EVP_MD *md) {
+  return md->flags;
+}
+static int EVP_DigestSign(
+  EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
+  const unsigned char *tbs, size_t tbslen)
+{
+  if (sigret != nullptr && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0) {
+    return 0;
+  }
+  return EVP_DigestSignFinal(ctx, sigret, siglen);
+}
+static int EVP_DigestVerify(
+  EVP_MD_CTX *ctx, const unsigned char *sigret,
+  size_t siglen, const unsigned char *tbs, size_t tbslen)
+{
+  if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0) {
+    return -1;
+  }
+  return EVP_DigestVerifyFinal(ctx, sigret, siglen);
+}
+
+static const SSL_METHOD* TLS_method() { return SSLv23_method(); }
+
+static void SSL_SESSION_get0_ticket(const SSL_SESSION* s,
+                                    const unsigned char** tick, size_t* len) {
+  *len = s->tlsext_ticklen;
+  if (tick != nullptr) {
+    *tick = s->tlsext_tick;
+  }
+}
+
+#define SSL_get_tlsext_status_type(ssl) (ssl->tlsext_status_type)
+
+static int X509_STORE_up_ref(X509_STORE* store) {
+  CRYPTO_add(&store->references, 1, CRYPTO_LOCK_X509_STORE);
+  return 1;
+}
+
+static int X509_up_ref(X509* cert) {
+  CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
+  return 1;
+}
+
+HMAC_CTX* HMAC_CTX_new() {
+  HMAC_CTX* ctx = Malloc<HMAC_CTX>(1);
+  HMAC_CTX_init(ctx);
+  return ctx;
+}
+
+// Disable all TLS version lower than the version argument
+int SSL_CTX_set_min_proto_version(SSL_CTX *ctx, int version) {
+    switch (version) {
+        case TLS1_2_VERSION:
+            SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_1);
+            [[fallthrough]];
+
+        case TLS1_1_VERSION:
+            SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1);
+            [[fallthrough]];
+
+        case TLS1_VERSION:
+            SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2);
+            return 1;
+
+        default:
+            return 0;  // unsupported
+    }
+}
+// Extract minimum supported version. Should be inverse of the setter above.
+int SSL_CTX_get_min_proto_version(SSL_CTX *ctx) {
+  static const auto full_mask = SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1;
+
+  auto opts = SSL_CTX_get_options(ctx);
+
+  switch (opts & full_mask) {
+    case SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1:
+      return TLS1_2_VERSION;
+
+    case SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1:
+      return TLS1_1_VERSION;
+
+    case SSL_OP_NO_SSLv3:
+      return TLS1_VERSION;
+
+    default:
+      return 0;
+  }
+}
+
+// Disable all TLS version higher than the version argument
+int SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version) {
+    switch (version) {
+        case TLS1_VERSION:
+            SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_1);
+            [[fallthrough]];
+
+        case TLS1_1_VERSION:
+            SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_2);
+            [[fallthrough]];
+
+        case TLS1_2_VERSION:
+            return 1;
+
+        default:
+            return 0;  // unsupported
+    }
+}
+// Extract maximum supported version. Should be inverse of the setter above.
+int SSL_CTX_get_max_proto_version(SSL_CTX *ctx) {
+  static const auto full_mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1_2;
+
+  auto opts = SSL_CTX_get_options(ctx);
+  switch (opts & full_mask) {
+    case SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1_2:
+      return TLS1_VERSION;
+
+    case SSL_OP_NO_TLSv1_2:
+      return TLS1_1_VERSION;
+
+    default:
+      return 0;
+  }
+}
+
+stack_st_X509_OBJECT *X509_STORE_get0_objects(X509_STORE *store) {
+    return store->objs;
+}
+
+int X509_OBJECT_get_type(X509_OBJECT *object) {
+    return object->type;
+}
+
+X509 *X509_OBJECT_get0_X509(X509_OBJECT *object) {
+    return (object->type == X509_LU_X509) ? object->data.x509 : nullptr;
+}
+
+#endif  // OPENSSL_VERSION_NUMBER < 0x10100000L
+
+
 static const char* const root_certs[] = {
 #include "node_root_certs.h"  // NOLINT(build/include_order)
 };
@@ -123,7 +331,11 @@ template int SSLWrap<TLSWrap>::SetCACerts(SecureContext* sc);
 template void SSLWrap<TLSWrap>::MemoryInfo(MemoryTracker* tracker) const;
 template SSL_SESSION* SSLWrap<TLSWrap>::GetSessionCallback(
     SSL* s,
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+    unsigned char* key,
+#else
     const unsigned char* key,
+#endif
     int len,
     int* copy);
 template int SSLWrap<TLSWrap>::NewSessionCallback(SSL* s,
@@ -145,6 +357,36 @@ template int SSLWrap<TLSWrap>::SelectALPNCallback(
     unsigned int inlen,
     void* arg);
 
+
+// Provide locking mechanism for OpenSSL
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+static Mutex* mutexes;
+
+static void crypto_threadid_cb(CRYPTO_THREADID* tid) {
+  static_assert(sizeof(uv_thread_t) <= sizeof(void*),
+                "uv_thread_t does not fit in a pointer");
+  CRYPTO_THREADID_set_pointer(tid, reinterpret_cast<void*>(uv_thread_self()));
+}
+
+
+static void crypto_lock_init(void) {
+  mutexes = new Mutex[CRYPTO_num_locks()];
+}
+
+
+static void crypto_lock_cb(int mode, int n, const char* file, int line) {
+  CHECK(!(mode & CRYPTO_LOCK) ^ !(mode & CRYPTO_UNLOCK));
+  CHECK(!(mode & CRYPTO_READ) ^ !(mode & CRYPTO_WRITE));
+
+  auto mutex = &mutexes[n];
+  if (mode & CRYPTO_LOCK)
+    mutex->Lock();
+  else
+    mutex->Unlock();
+}
+#endif
+
+
 static int PasswordCallback(char* buf, int size, int rwflag, void* u) {
   const char* passphrase = static_cast<char*>(u);
   if (passphrase != nullptr) {
@@ -276,15 +518,10 @@ Maybe<bool> Decorate(Environment* env, Local<Object> obj,
     V(COMP)                                                                   \
     V(ECDSA)                                                                  \
     V(ECDH)                                                                   \
-    V(OSSL_STORE)                                                             \
     V(FIPS)                                                                   \
     V(CMS)                                                                    \
     V(TS)                                                                     \
     V(HMAC)                                                                   \
-    V(CT)                                                                     \
-    V(ASYNC)                                                                  \
-    V(KDF)                                                                    \
-    V(SM2)                                                                    \
     V(USER)                                                                   \
 
 #define V(name) case ERR_LIB_##name: lib = #name "_"; break;
@@ -524,9 +761,13 @@ void SecureContext::New(const FunctionCallbackInfo<Value>& args) {
   new SecureContext(env, args.This());
 }
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 // A maxVersion of 0 means "any", but OpenSSL may support TLS versions that
 // Node.js doesn't, so pin the max to what we do support.
 const int MAX_SUPPORTED_VERSION = TLS1_3_VERSION;
+#else
+const int MAX_SUPPORTED_VERSION = TLS1_2_VERSION;
+#endif
 
 void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {
   SecureContext* sc;
@@ -539,7 +780,7 @@ void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {
 
   int min_version = args[1].As<Int32>()->Value();
   int max_version = args[2].As<Int32>()->Value();
-  const SSL_METHOD* method = TLS_method();
+  const SSL_METHOD* method = SSLv23_method();
 
   if (max_version == 0)
     max_version = MAX_SUPPORTED_VERSION;
@@ -573,54 +814,57 @@ void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {
       max_version = TLS1_2_VERSION;
     } else if (strcmp(*sslmethod, "SSLv23_server_method") == 0) {
       max_version = TLS1_2_VERSION;
-      method = TLS_server_method();
+      method = SSLv23_server_method();
     } else if (strcmp(*sslmethod, "SSLv23_client_method") == 0) {
       max_version = TLS1_2_VERSION;
-      method = TLS_client_method();
+      method = SSLv23_client_method();
     } else if (strcmp(*sslmethod, "TLS_method") == 0) {
       min_version = 0;
       max_version = MAX_SUPPORTED_VERSION;
     } else if (strcmp(*sslmethod, "TLS_server_method") == 0) {
       min_version = 0;
       max_version = MAX_SUPPORTED_VERSION;
-      method = TLS_server_method();
+      method = SSLv23_server_method();
     } else if (strcmp(*sslmethod, "TLS_client_method") == 0) {
       min_version = 0;
       max_version = MAX_SUPPORTED_VERSION;
-      method = TLS_client_method();
+      method = SSLv23_client_method();
     } else if (strcmp(*sslmethod, "TLSv1_method") == 0) {
       min_version = TLS1_VERSION;
       max_version = TLS1_VERSION;
+      method = TLSv1_method();
     } else if (strcmp(*sslmethod, "TLSv1_server_method") == 0) {
       min_version = TLS1_VERSION;
       max_version = TLS1_VERSION;
-      method = TLS_server_method();
+      method = TLSv1_server_method();
     } else if (strcmp(*sslmethod, "TLSv1_client_method") == 0) {
       min_version = TLS1_VERSION;
       max_version = TLS1_VERSION;
-      method = TLS_client_method();
+      method = TLSv1_client_method();
     } else if (strcmp(*sslmethod, "TLSv1_1_method") == 0) {
       min_version = TLS1_1_VERSION;
       max_version = TLS1_1_VERSION;
+      method = TLSv1_1_method();
     } else if (strcmp(*sslmethod, "TLSv1_1_server_method") == 0) {
       min_version = TLS1_1_VERSION;
       max_version = TLS1_1_VERSION;
-      method = TLS_server_method();
+      method = TLSv1_1_server_method();
     } else if (strcmp(*sslmethod, "TLSv1_1_client_method") == 0) {
       min_version = TLS1_1_VERSION;
       max_version = TLS1_1_VERSION;
-      method = TLS_client_method();
+      method = TLSv1_1_client_method();
     } else if (strcmp(*sslmethod, "TLSv1_2_method") == 0) {
       min_version = TLS1_2_VERSION;
       max_version = TLS1_2_VERSION;
+      method = TLSv1_2_method();
     } else if (strcmp(*sslmethod, "TLSv1_2_server_method") == 0) {
       min_version = TLS1_2_VERSION;
       max_version = TLS1_2_VERSION;
-      method = TLS_server_method();
+      method = TLSv1_2_server_method();
     } else if (strcmp(*sslmethod, "TLSv1_2_client_method") == 0) {
       min_version = TLS1_2_VERSION;
       max_version = TLS1_2_VERSION;
-      method = TLS_client_method();
+      method = TLSv1_2_client_method();
     } else {
       const std::string msg("Unknown method: ");
       THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, (msg + * sslmethod).c_str());
@@ -650,9 +894,16 @@ void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {
                                  SSL_SESS_CACHE_NO_INTERNAL |
                                  SSL_SESS_CACHE_NO_AUTO_CLEAR);
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  if (max_version == 0) {
+    // Selecting some secureProtocol methods allows the TLS version to be "any
+    // supported", but we don't support TLSv1.3, even if OpenSSL does.
+    max_version = TLS1_2_VERSION;
+  }
+#endif
   SSL_CTX_set_min_proto_version(sc->ctx_.get(), min_version);
   SSL_CTX_set_max_proto_version(sc->ctx_.get(), max_version);
-
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   // OpenSSL 1.1.0 changed the ticket key size, but the OpenSSL 1.0.x size was
   // exposed in the public API. To retain compatibility, install a callback
   // which restores the old algorithm.
@@ -662,6 +913,7 @@ void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {
     return env->ThrowError("Error generating ticket keys");
   }
   SSL_CTX_set_tlsext_ticket_key_cb(sc->ctx_.get(), TicketCompatibilityCallback);
+#endif
 }
 
 
@@ -1151,6 +1403,7 @@ void SecureContext::SetCiphers(const FunctionCallbackInfo<Value>& args) {
   CHECK_EQ(args.Length(), 1);
   CHECK(args[0]->IsString());
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   const node::Utf8Value ciphers(args.GetIsolate(), args[0]);
   if (!SSL_CTX_set_cipher_list(sc->ctx_.get(), *ciphers)) {
     unsigned long err = ERR_get_error();  // NOLINT(runtime/int)
@@ -1162,6 +1415,32 @@ void SecureContext::SetCiphers(const FunctionCallbackInfo<Value>& args) {
       // that's actually an error.
       return;
     }
+#else
+  // Note: set_ciphersuites() is for TLSv1.3 and was introduced in openssl
+  // 1.1.1, set_cipher_list() is for TLSv1.2 and earlier.
+  //
+  // In openssl 1.1.0, set_cipher_list() would error if it resulted in no
+  // TLSv1.2 (and earlier) cipher suites, and there is no TLSv1.3 support.
+  //
+  // In openssl 1.1.1, set_cipher_list() will not error if it results in no
+  // TLSv1.2 cipher suites if there are any TLSv1.3 cipher suites, which there
+  // are by default. There will be an error later, during the handshake, but
+  // that results in an async error event, rather than a sync error thrown,
+  // which is a semver-major change for the tls API.
+  //
+  // Since we don't currently support TLSv1.3, work around this by removing the
+  // TLSv1.3 cipher suites, so we get backwards compatible synchronous errors.
+  const node::Utf8Value ciphers(args.GetIsolate(), args[0]);
+  if (
+#if defined(TLS1_3_VERSION) && !defined(OPENSSL_IS_BORINGSSL)
+      !SSL_CTX_set_ciphersuites(sc->ctx_.get(), "") ||
+#endif
+      !SSL_CTX_set_cipher_list(sc->ctx_.get(), *ciphers)) {
+    unsigned long err = ERR_get_error();  // NOLINT(runtime/int)
+    if (!err) {
+      return env->ThrowError("Failed to set ciphers");
+    }
+#endif
     return ThrowCryptoError(env, err, "Failed to set ciphers");
   }
 }
@@ -1179,6 +1458,11 @@ void SecureContext::SetECDHCurve(const FunctionCallbackInfo<Value>& args) {
 
   node::Utf8Value curve(env->isolate(), args[0]);
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  SSL_CTX_set_options(sc->ctx_.get(), SSL_OP_SINGLE_ECDH_USE);
+  SSL_CTX_set_ecdh_auto(sc->ctx_.get(), 1);
+#endif
+
   if (strcmp(*curve, "auto") == 0)
     return;
 
@@ -1481,9 +1765,17 @@ void SecureContext::GetTicketKeys(const FunctionCallbackInfo<Value>& args) {
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
 
   Local<Object> buff = Buffer::New(wrap->env(), 48).ToLocalChecked();
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   memcpy(Buffer::Data(buff), wrap->ticket_key_name_, 16);
   memcpy(Buffer::Data(buff) + 16, wrap->ticket_key_hmac_, 16);
   memcpy(Buffer::Data(buff) + 32, wrap->ticket_key_aes_, 16);
+#else
+  if (SSL_CTX_set_tlsext_ticket_keys(wrap->ctx_.get(),
+                                     Buffer::Data(buff),
+                                     Buffer::Length(buff)) != 1) {
+    return wrap->env()->ThrowError("Failed to fetch tls ticket keys");
+  }
+#endif
 
   args.GetReturnValue().Set(buff);
 #endif  // !def(OPENSSL_NO_TLSEXT) && def(SSL_CTX_get_tlsext_ticket_keys)
@@ -1519,6 +1811,14 @@ void SecureContext::SetTicketKeys(const FunctionCallbackInfo<Value>& args) {
 
 
 void SecureContext::SetFreeListLength(const FunctionCallbackInfo<Value>& args) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  // |freelist_max_len| was removed in OpenSSL 1.1.0. In that version OpenSSL
+  // mallocs and frees buffers directly, without the use of a freelist.
+  SecureContext* wrap;
+  ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
+
+  wrap->ctx_->freelist_max_len = args[0].As<Int32>()->Value();
+#endif
 }
 
 
@@ -1621,6 +1921,7 @@ int SecureContext::TicketKeyCallback(SSL* ssl,
 }
 
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 int SecureContext::TicketCompatibilityCallback(SSL* ssl,
                                                unsigned char* name,
                                                unsigned char* iv,
@@ -1655,6 +1956,7 @@ int SecureContext::TicketCompatibilityCallback(SSL* ssl,
   }
   return 1;
 }
+#endif
 
 
 void SecureContext::CtxGetter(const FunctionCallbackInfo<Value>& info) {
@@ -1737,7 +2039,11 @@ void SSLWrap<Base>::ConfigureSecureContext(SecureContext* sc) {
 
 template <class Base>
 SSL_SESSION* SSLWrap<Base>::GetSessionCallback(SSL* s,
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+                                               unsigned char* key,
+#else
                                                const unsigned char* key,
+#endif
                                                int len,
                                                int* copy) {
   Base* w = static_cast<Base*>(SSL_get_app_data(s));
@@ -3362,14 +3668,17 @@ Local<Value> KeyObject::GetAsymmetricKeyType() const {
   switch (EVP_PKEY_id(this->asymmetric_key_.get())) {
   case EVP_PKEY_RSA:
     return env()->crypto_rsa_string();
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   case EVP_PKEY_RSA_PSS:
     return env()->crypto_rsa_pss_string();
+#endif
   case EVP_PKEY_DSA:
     return env()->crypto_dsa_string();
   case EVP_PKEY_DH:
     return env()->crypto_dh_string();
   case EVP_PKEY_EC:
     return env()->crypto_ec_string();
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   case EVP_PKEY_ED25519:
     return env()->crypto_ed25519_string();
   case EVP_PKEY_ED448:
@@ -3378,6 +3687,7 @@ Local<Value> KeyObject::GetAsymmetricKeyType() const {
     return env()->crypto_x25519_string();
   case EVP_PKEY_X448:
     return env()->crypto_x448_string();
+#endif
   default:
     return Undefined(env()->isolate());
   }
@@ -3685,10 +3995,10 @@ bool CipherBase::InitAuthenticated(const char* cipher_type, int iv_len,
   CHECK(IsAuthenticatedMode());
   MarkPopErrorOnReturn mark_pop_error_on_return;
 
-  if (!EVP_CIPHER_CTX_ctrl(ctx_.get(),
-                           EVP_CTRL_AEAD_SET_IVLEN,
-                           iv_len,
-                           nullptr)) {
+  // TODO(tniessen) Use EVP_CTRL_AEAD_SET_IVLEN when migrating to OpenSSL 1.1.0
+  static_assert(EVP_CTRL_CCM_SET_IVLEN == EVP_CTRL_GCM_SET_IVLEN,
+                "OpenSSL constants differ between GCM and CCM");
+  if (!EVP_CIPHER_CTX_ctrl(ctx_.get(), EVP_CTRL_GCM_SET_IVLEN, iv_len, nullptr)) {
     env()->ThrowError("Invalid IV length");
     return false;
   }
@@ -4036,8 +4346,12 @@ bool CipherBase::Final(AllocatedBuffer* out) {
         CHECK(mode == EVP_CIPH_GCM_MODE);
         auth_tag_len_ = sizeof(auth_tag_);
       }
-      CHECK_EQ(1, EVP_CIPHER_CTX_ctrl(ctx_.get(), EVP_CTRL_AEAD_GET_TAG,
-                      auth_tag_len_,
+//      CHECK_EQ(1, EVP_CIPHER_CTX_ctrl(ctx_.get(), EVP_CTRL_AEAD_GET_TAG,
+//                      auth_tag_len_,
+      // TOOD(tniessen) Use EVP_CTRL_AEAP_GET_TAG in OpenSSL 1.1.0
+      static_assert(EVP_CTRL_CCM_GET_TAG == EVP_CTRL_GCM_GET_TAG,
+                    "OpenSSL constants differ between GCM and CCM");
+      CHECK_EQ(1, EVP_CIPHER_CTX_ctrl(ctx_.get(), EVP_CTRL_GCM_GET_TAG, auth_tag_len_,
                       reinterpret_cast<unsigned char*>(auth_tag_)));
     }
   }
@@ -4345,8 +4659,12 @@ void Hash::HashDigest(const FunctionCallbackInfo<Value>& args) {
       ret = EVP_DigestFinal_ex(hash->mdctx_.get(), hash->md_value_,
                                &hash->md_len_);
     } else {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
       ret = EVP_DigestFinalXOF(hash->mdctx_.get(), hash->md_value_,
                                hash->md_len_);
+#else
+      return env->ThrowError("Unsupported XOF digest");
+#endif  // OPENSSL_VERSION_NUMBER >= 0x10100000L
     }
 
     if (ret != 1) {
@@ -4376,12 +4694,14 @@ void Hash::HashDigest(const FunctionCallbackInfo<Value>& args) {
 
 SignBase::Error SignBase::Init(const char* sign_type) {
   CHECK_NULL(mdctx_);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   // Historically, "dss1" and "DSS1" were DSA aliases for SHA-1
   // exposed through the public API.
   if (strcmp(sign_type, "dss1") == 0 ||
       strcmp(sign_type, "DSS1") == 0) {
     sign_type = "SHA1";
   }
+#endif
   const EVP_MD* md = EVP_get_digestbyname(sign_type);
   if (md == nullptr)
     return kSignUnknownDigest;
@@ -4457,9 +4777,14 @@ static bool ApplyRSAOptions(const ManagedEVPPKey& pkey,
                             EVP_PKEY_CTX* pkctx,
                             int padding,
                             const Maybe<int>& salt_len) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   if (EVP_PKEY_id(pkey.get()) == EVP_PKEY_RSA ||
       EVP_PKEY_id(pkey.get()) == EVP_PKEY_RSA2 ||
       EVP_PKEY_id(pkey.get()) == EVP_PKEY_RSA_PSS) {
+#else
+  if (EVP_PKEY_id(pkey.get()) == EVP_PKEY_RSA ||
+      EVP_PKEY_id(pkey.get()) == EVP_PKEY_RSA2) {
+#endif
     if (EVP_PKEY_CTX_set_rsa_padding(pkctx, padding) <= 0)
       return false;
     if (padding == RSA_PKCS1_PSS_PADDING && salt_len.IsJust()) {
@@ -4518,9 +4843,13 @@ void Sign::SignUpdate(const FunctionCallbackInfo<Value>& args) {
   sign->CheckThrow(err);
 }
 
-static int GetDefaultSignPadding(const ManagedEVPPKey& key) {
+static int GetDefaultSignPadding([[maybe_unused]] const ManagedEVPPKey& key) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  return RSA_PKCS1_PADDING;
+#else
   return EVP_PKEY_id(key.get()) == EVP_PKEY_RSA_PSS ? RSA_PKCS1_PSS_PADDING :
                                                       RSA_PKCS1_PADDING;
+#endif // OPENSSL_VERSION_NUMBER < 0x10100000L
 }
 
 static const unsigned int kNoDsaSignature = static_cast<unsigned int>(-1);
@@ -4910,6 +5239,9 @@ void Verify::VerifyFinal(const FunctionCallbackInfo<Value>& args) {
     if (signature.get() == nullptr)
       return verify->CheckThrow(Error::kSignMalformedSignature);
   }
+#else // OPENSSL_VERSION_NUMBER >= 0x10100000L
+  ByteSource signature = ByteSource::Foreign(hbuf.data(), hbuf.length());
+#endif
 
   bool verify_result;
   Error err = verify->VerifyFinal(pkey, signature, padding,
@@ -5165,11 +5497,15 @@ bool DiffieHellman::Init(int primeLength, int g) {
 bool DiffieHellman::Init(const char* p, int p_len, int g) {
   dh_.reset(DH_new());
   if (p_len <= 0) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
     BNerr(BN_F_BN_GENERATE_PRIME_EX, BN_R_BITS_TOO_SMALL);
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
     return false;
   }
   if (g <= 1) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
     DHerr(DH_F_DH_BUILTIN_GENPARAMS, DH_R_BAD_GENERATOR);
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
     return false;
   }
   BIGNUM* bn_p =
@@ -5188,11 +5524,15 @@ bool DiffieHellman::Init(const char* p, int p_len, int g) {
 bool DiffieHellman::Init(const char* p, int p_len, const char* g, int g_len) {
   dh_.reset(DH_new());
   if (p_len <= 0) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
     BNerr(BN_F_BN_GENERATE_PRIME_EX, BN_R_BITS_TOO_SMALL);
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
     return false;
   }
   if (g_len <= 0) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
     DHerr(DH_F_DH_BUILTIN_GENPARAMS, DH_R_BAD_GENERATOR);
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
     return false;
   }
   BIGNUM* bn_g =
@@ -5842,9 +6182,24 @@ struct PBKDF2Job : public CryptoJob {
   }
 
   inline void DoThreadPoolWork() override {
-    auto salt_data = reinterpret_cast<const unsigned char*>(salt.data());
+    static const auto *empty = "";
+
+    auto pass_data = reinterpret_cast<const char *>(empty);
+    auto pass_size = int(0);
+    auto salt_data = reinterpret_cast<const unsigned char *>(empty);
+    auto salt_size = int(0);
+
+    if (pass.size() > 0) {
+      pass_data = pass.data();
+      pass_size = pass.size();
+    }
+    if (salt.size() > 0) {
+      salt_data = reinterpret_cast<const unsigned char *>(salt.data());
+      salt_size = salt.size();
+    }
+
     const bool ok =
-        PKCS5_PBKDF2_HMAC(pass.data(), pass.size(), salt_data, salt.size(),
+        PKCS5_PBKDF2_HMAC(pass_data, pass_size, salt_data, salt_size,
                           iteration_count, digest, keybuf_size, keybuf_data);
     success = Just(ok);
     Cleanse();
@@ -6027,6 +6382,7 @@ class RSAKeyPairGenerationConfig : public KeyPairGenerationConfig {
   const unsigned int exponent_;
 };
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 class RSAPSSKeyPairGenerationConfig : public RSAKeyPairGenerationConfig {
  public:
   RSAPSSKeyPairGenerationConfig(unsigned int modulus_bits,
@@ -6068,6 +6424,7 @@ class RSAPSSKeyPairGenerationConfig : public RSAKeyPairGenerationConfig {
   const EVP_MD* mgf1_md_;
   const int saltlen_;
 };
+#endif
 
 class DSAKeyPairGenerationConfig : public KeyPairGenerationConfig {
  public:
@@ -6143,6 +6500,7 @@ class ECKeyPairGenerationConfig : public KeyPairGenerationConfig {
   const int param_encoding_;
 };
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 class NidKeyPairGenerationConfig : public KeyPairGenerationConfig {
  public:
   explicit NidKeyPairGenerationConfig(int id) : id_(id) {}
@@ -6154,6 +6512,7 @@ class NidKeyPairGenerationConfig : public KeyPairGenerationConfig {
  private:
   const int id_;
 };
+#endif
 
 // TODO(tniessen): Use std::variant instead.
 // Diffie-Hellman can either generate keys using a fixed prime, or by first
@@ -6357,6 +6716,7 @@ void GenerateKeyPairRSA(const FunctionCallbackInfo<Value>& args) {
   GenerateKeyPair(args, 2, std::move(config));
 }
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 void GenerateKeyPairRSAPSS(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
@@ -6394,6 +6754,7 @@ void GenerateKeyPairRSAPSS(const FunctionCallbackInfo<Value>& args) {
                                         md, mgf1_md, saltlen));
   GenerateKeyPair(args, 5, std::move(config));
 }
+#endif
 
 void GenerateKeyPairDSA(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[0]->IsUint32());
@@ -6425,6 +6786,7 @@ void GenerateKeyPairEC(const FunctionCallbackInfo<Value>& args) {
   GenerateKeyPair(args, 2, std::move(config));
 }
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 void GenerateKeyPairNid(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[0]->IsInt32());
   const int id = args[0].As<Int32>()->Value();
@@ -6432,6 +6794,7 @@ void GenerateKeyPairNid(const FunctionCallbackInfo<Value>& args) {
       new NidKeyPairGenerationConfig(id));
   GenerateKeyPair(args, 1, std::move(config));
 }
+#endif
 
 void GenerateKeyPairDH(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
@@ -6477,6 +6840,7 @@ void GetSSLCiphers(const FunctionCallbackInfo<Value>& args) {
   CHECK(ssl);
 
   STACK_OF(SSL_CIPHER)* ciphers = SSL_get_ciphers(ssl.get());
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   // TLSv1.3 ciphers aren't listed by EVP. There are only 5, we could just
   // document them, but since there are only 5, easier to just add them manually
   // and not have to explain their absence in the API docs. They are lower-cased
@@ -6488,19 +6852,26 @@ void GetSSLCiphers(const FunctionCallbackInfo<Value>& args) {
     "tls_aes_128_ccm_8_sha256",
     "tls_aes_128_ccm_sha256"
   };
+#endif
 
   const int n = sk_SSL_CIPHER_num(ciphers);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   std::vector<Local<Value>> arr(n + arraysize(TLS13_CIPHERS));
+#else
+  std::vector<Local<Value>> arr(n);
+#endif
 
   for (int i = 0; i < n; ++i) {
     const SSL_CIPHER* cipher = sk_SSL_CIPHER_value(ciphers, i);
     arr[i] = OneByteString(env->isolate(), SSL_CIPHER_get_name(cipher));
   }
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   for (unsigned i = 0; i < arraysize(TLS13_CIPHERS); ++i) {
     const char* name = TLS13_CIPHERS[i];
     arr[n + i] = OneByteString(env->isolate(), name);
   }
+#endif
 
   args.GetReturnValue().Set(Array::New(env->isolate(), arr.data(), arr.size()));
 }
@@ -6803,7 +7174,7 @@ void TimingSafeEqual(const FunctionCallbackInfo<Value>& args) {
 }
 
 void InitCryptoOnce() {
-#ifndef OPENSSL_IS_BORINGSSL
+#if !defined(OPENSSL_IS_BORINGSSL) && OPENSSL_VERSION_NUMBER >= 0x10100000L
   OPENSSL_INIT_SETTINGS* settings = OPENSSL_INIT_new();
 
   // --openssl-config=...
@@ -6815,7 +7186,35 @@ void InitCryptoOnce() {
   OPENSSL_init_ssl(0, settings);
   OPENSSL_INIT_free(settings);
   settings = nullptr;
-#endif
+#else // !defined(OPENSSL_IS_BORINGSSL) && OPENSSL_VERSION_NUMBER >= 0x10100000L
+  SSL_load_error_strings();
+  OPENSSL_no_config();
+
+  // --openssl-config=...
+  if (!per_process::cli_options->openssl_config.empty()) {
+    OPENSSL_load_builtin_modules();
+#ifndef OPENSSL_NO_ENGINE
+    ENGINE_load_builtin_engines();
+#endif // OPENSSL_NO_ENGINE
+    ERR_clear_error();
+
+    const char *conf = per_process::cli_options->openssl_config.c_str();
+    CONF_modules_load_file(conf, nullptr, CONF_MFLAGS_DEFAULT_SECTION);
+    auto err = ERR_get_error();
+    if (err != 0) {
+      fprintf(stderr, "openssl config failed: %s\n", ERR_error_string(err, nullptr));
+      CHECK_NE(err, 0);
+    }
+  }
+
+  // Initialize the whole library
+  SSL_library_init();
+  OpenSSL_add_all_algorithms();
+  // Allocate mutex array and set appropriate callbacks
+  crypto_lock_init();
+  CRYPTO_set_locking_callback(crypto_lock_cb);
+  CRYPTO_THREADID_set_callback(crypto_threadid_cb);
+#endif // !defined(OPENSSL_IS_BORINGSSL) && OPENSSL_VERSION_NUMBER >= 0x10100000L
 
 #ifdef NODE_FIPS_MODE
   /* Override FIPS settings in cnf file, if needed. */
@@ -6938,15 +7337,21 @@ void Initialize(Local<Object> target,
 
   env->SetMethod(target, "pbkdf2", PBKDF2);
   env->SetMethod(target, "generateKeyPairRSA", GenerateKeyPairRSA);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   env->SetMethod(target, "generateKeyPairRSAPSS", GenerateKeyPairRSAPSS);
+#endif
   env->SetMethod(target, "generateKeyPairDSA", GenerateKeyPairDSA);
   env->SetMethod(target, "generateKeyPairEC", GenerateKeyPairEC);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   env->SetMethod(target, "generateKeyPairNid", GenerateKeyPairNid);
+#endif
   env->SetMethod(target, "generateKeyPairDH", GenerateKeyPairDH);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   NODE_DEFINE_CONSTANT(target, EVP_PKEY_ED25519);
   NODE_DEFINE_CONSTANT(target, EVP_PKEY_ED448);
   NODE_DEFINE_CONSTANT(target, EVP_PKEY_X25519);
   NODE_DEFINE_CONSTANT(target, EVP_PKEY_X448);
+#endif
   NODE_DEFINE_CONSTANT(target, OPENSSL_EC_NAMED_CURVE);
   NODE_DEFINE_CONSTANT(target, OPENSSL_EC_EXPLICIT_CURVE);
   NODE_DEFINE_CONSTANT(target, kKeyEncodingPKCS1);
diff --git a/src/node_crypto.h b/src/node_crypto.h
index 772a34a..f61ad3d 100644
--- a/src/node_crypto.h
+++ b/src/node_crypto.h
@@ -35,10 +35,77 @@
 
 #include <openssl/err.h>
 #include <openssl/ssl.h>
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 #include <openssl/bn.h>
 #include <openssl/dh.h>
 #include <openssl/ec.h>
 #include <openssl/rsa.h>
+#endif
+
+// OpenSSL backport shims
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+
+// Declare what OpenSSL features we do not support
+// Pretending we are BoringSSL can also help
+#define OPENSSL_IS_BORINGSSL
+#define OPENSSL_NO_OCB
+#define OPENSSL_NO_SCRYPT
+
+#define EVP_CTRL_AEAD_SET_TAG EVP_CTRL_CCM_SET_TAG
+#define EVP_MD_CTX_free EVP_MD_CTX_destroy
+#define EVP_MD_CTX_new EVP_MD_CTX_create
+
+// Values from upstream
+#define OPENSSL_EC_EXPLICIT_CURVE           0x0
+#define NID_chacha20_poly1305               1018
+#define EVP_MD_FLAG_XOF                     0x0002
+#define EVP_F_EVP_DIGESTFINALXOF            0
+#define EVP_R_NOT_XOF_OR_INVALID_LENGTH     178
+
+inline void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX* ctx) { EVP_CIPHER_CTX_cleanup(ctx); }
+inline void HMAC_CTX_free(HMAC_CTX* ctx) { if (ctx == nullptr) { return; } HMAC_CTX_cleanup(ctx); free(ctx); }
+inline void OPENSSL_clear_free(void* ptr, size_t len) {
+  if (ptr == nullptr) { return; }
+  OPENSSL_cleanse(ptr, len);
+  OPENSSL_free(ptr);
+}
+
+inline int BN_bn2binpad(const BIGNUM* a, unsigned char *to, int tolen) {
+    if (tolen < 0 || to == nullptr) { return -1; }
+    OPENSSL_cleanse(to, tolen);
+    return BN_bn2bin(a, to);
+}
+
+inline void RSA_get0_key(const RSA* r, const BIGNUM** n, const BIGNUM** e,
+                         const BIGNUM** d) {
+  if (n != nullptr) {
+    *n = r->n;
+  }
+  if (e != nullptr) {
+    *e = r->e;
+  }
+  if (d != nullptr) {
+    *d = r->d;
+  }
+}
+
+inline int EC_GROUP_order_bits(const EC_GROUP *group) {
+  int num_bits = 0;
+  BIGNUM *order = BN_new();
+  BN_CTX *ctx = BN_CTX_new();
+  if (order == nullptr || ctx == nullptr) { goto end; }
+
+  if (EC_GROUP_get_order(group, order, ctx) != 1) { goto end; }
+  num_bits = BN_num_bits(order);
+
+end:
+  BN_CTX_free(ctx), ctx = nullptr;
+  BN_free(order), order = nullptr;
+
+  return num_bits;
+}
+
+#endif // OPENSSL_VERSION_NUMBER < 0x10100000L
 
 namespace node {
 namespace crypto {
@@ -230,10 +297,17 @@ class SSLWrap {
   static void ConfigureSecureContext(SecureContext* sc);
   static void AddMethods(Environment* env, v8::Local<v8::FunctionTemplate> t);
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  static SSL_SESSION* GetSessionCallback(SSL* s,
+                                         unsigned char* key,
+                                         int len,
+                                         int* copy);
+#else
   static SSL_SESSION* GetSessionCallback(SSL* s,
                                          const unsigned char* key,
                                          int len,
                                          int* copy);
+#endif
   static int NewSessionCallback(SSL* s, SSL_SESSION* sess);
   static void KeylogCallback(const SSL* s, const char* line);
   static void OnClientHello(void* arg,
@@ -353,6 +427,9 @@ class ByteSource {
   size_t size_ = 0;
 
   ByteSource(const char* data, char* allocated_data, size_t size);
+public:
+  static ByteSource Allocated(char* data, size_t size);
+  static ByteSource Foreign(const char* data, size_t size);
 };
 
 enum PKEncodingType {
diff --git a/src/node_crypto_bio.cc b/src/node_crypto_bio.cc
index 55f5e8a..72af159 100644
--- a/src/node_crypto_bio.cc
+++ b/src/node_crypto_bio.cc
@@ -30,8 +30,18 @@
 namespace node {
 namespace crypto {
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#define BIO_set_data(bio, data) bio->ptr = data
+#define BIO_get_data(bio) bio->ptr
+#define BIO_set_shutdown(bio, shutdown_) bio->shutdown = shutdown_
+#define BIO_get_shutdown(bio) bio->shutdown
+#define BIO_set_init(bio, init_) bio->init = init_
+#define BIO_get_init(bio) bio->init
+#endif
+
+
 BIOPointer NodeBIO::New(Environment* env) {
-  BIOPointer bio(BIO_new(GetMethod()));
+  BIOPointer bio(BIO_new(const_cast<BIO_METHOD*>(GetMethod())));
   if (bio && env != nullptr)
     NodeBIO::FromBIO(bio.get())->env_ = env;
   return bio;
@@ -221,6 +231,22 @@ long NodeBIO::Ctrl(BIO* bio, int cmd, long num,  // NOLINT(runtime/int)
 
 
 const BIO_METHOD* NodeBIO::GetMethod() {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  static const BIO_METHOD method = {
+    BIO_TYPE_MEM,
+    "node.js SSL buffer",
+    Write,
+    Read,
+    Puts,
+    Gets,
+    Ctrl,
+    New,
+    Free,
+    nullptr
+  };
+
+  return &method;
+#else
   // This is called from InitCryptoOnce() to avoid race conditions during
   // initialization.
   static BIO_METHOD* method = nullptr;
@@ -237,6 +263,7 @@ const BIO_METHOD* NodeBIO::GetMethod() {
   }
 
   return method;
+#endif
 }
 
 
diff --git a/src/node_crypto_common.cc b/src/node_crypto_common.cc
index 3b35ee1..e33e52e 100644
--- a/src/node_crypto_common.cc
+++ b/src/node_crypto_common.cc
@@ -55,10 +55,11 @@ int SSL_CTX_get_issuer(SSL_CTX* ctx, X509* cert, X509** issuer) {
 }
 
 void LogSecret(
-    const SSLPointer& ssl,
-    const char* name,
-    const unsigned char* secret,
-    size_t secretlen) {
+    [[maybe_unused]] const SSLPointer& ssl,
+    [[maybe_unused]] const char* name,
+    [[maybe_unused]] const unsigned char* secret,
+    [[maybe_unused]] size_t secretlen) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   auto keylog_cb = SSL_CTX_get_keylog_callback(SSL_get_SSL_CTX(ssl.get()));
   unsigned char crandom[32];
 
@@ -73,6 +74,7 @@ void LogSecret(
   line += " " + StringBytes::hex_encode(
       reinterpret_cast<const char*>(secret), secretlen);
   keylog_cb(ssl.get(), line.c_str());
+#endif
 }
 
 bool SetALPN(const SSLPointer& ssl, const std::string& alpn) {
@@ -195,7 +197,11 @@ std::string GetCertificateCN(X509* cert) {
         ASN1_STRING* cn_str = X509_NAME_ENTRY_get_data(cn);
         if (cn_str != nullptr) {
           return std::string(reinterpret_cast<const char*>(
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
               ASN1_STRING_get0_data(cn_str)));
+#else // OPENSSL_VERSION_NUMBER >= 0x10100000L
+              ASN1_STRING_data(cn_str)));
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
         }
       }
     }
@@ -238,6 +244,7 @@ int UseSNIContext(const SSLPointer& ssl, BaseObjectPtr<SecureContext> context) {
   return err;
 }
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 const char* GetClientHelloALPN(const SSLPointer& ssl) {
   const unsigned char* buf;
   size_t len;
@@ -284,13 +291,18 @@ const char* GetClientHelloServerName(const SSLPointer& ssl) {
     return nullptr;
   return reinterpret_cast<const char*>(buf + 5);
 }
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
 
 const char* GetServerName(SSL* ssl) {
   return SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
 }
 
 bool SetGroups(SecureContext* sc, const char* groups) {
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L
   return SSL_CTX_set1_groups_list(**sc, groups) == 1;
+#else // OPENSSL_VERSION_NUMBER >= 0x10101000L
+  return SSL_CTX_set1_curves_list(**sc, groups) == 1;
+#endif // OPENSSL_VERSION_NUMBER >= 0x10101000L
 }
 
 const char* X509ErrorCode(long err) {  // NOLINT(runtime/int)
@@ -609,7 +621,11 @@ MaybeLocal<Value> GetValidTo(
     Environment* env,
     X509* cert,
     const BIOPointer& bio) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  ASN1_TIME_print(bio.get(), X509_get_notAfter(cert));
+#else
   ASN1_TIME_print(bio.get(), X509_get0_notAfter(cert));
+#endif
   return ToV8Value(env, bio);
 }
 
@@ -617,7 +633,11 @@ MaybeLocal<Value> GetValidFrom(
     Environment* env,
     X509* cert,
     const BIOPointer& bio) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  ASN1_TIME_print(bio.get(), X509_get_notBefore(cert));
+#else
   ASN1_TIME_print(bio.get(), X509_get0_notBefore(cert));
+#endif
   return ToV8Value(env, bio);
 }
 
@@ -768,6 +788,7 @@ MaybeLocal<Value> GetCipherVersion(Environment* env, const SSLPointer& ssl) {
   return GetCipherVersion(env, SSL_get_current_cipher(ssl.get()));
 }
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 MaybeLocal<Array> GetClientHelloCiphers(
     Environment* env,
     const SSLPointer& ssl) {
@@ -800,6 +821,7 @@ MaybeLocal<Array> GetClientHelloCiphers(
   Local<Array> ret = Array::New(env->isolate(), ciphers.out(), count);
   return scope.Escape(ret);
 }
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
 
 
 MaybeLocal<Object> GetCipherInfo(Environment* env, const SSLPointer& ssl) {
@@ -849,8 +871,10 @@ MaybeLocal<Object> GetEphemeralKey(Environment* env, const SSLPointer& ssl) {
       }
       break;
     case EVP_PKEY_EC:
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
     case EVP_PKEY_X25519:
     case EVP_PKEY_X448:
+#endif
       {
         const char* curve_name;
         if (kid == EVP_PKEY_EC) {
diff --git a/src/node_crypto_common.h b/src/node_crypto_common.h
index c373a97..bdf25e7 100644
--- a/src/node_crypto_common.h
+++ b/src/node_crypto_common.h
@@ -73,9 +73,11 @@ long VerifyPeerCertificate(  // NOLINT(runtime/int)
 
 int UseSNIContext(const SSLPointer& ssl, BaseObjectPtr<SecureContext> context);
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 const char* GetClientHelloALPN(const SSLPointer& ssl);
 
 const char* GetClientHelloServerName(const SSLPointer& ssl);
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
 
 const char* GetServerName(SSL* ssl);
 
diff --git a/src/node_errors.h b/src/node_errors.h
index f79b87a..ad8c272 100644
--- a/src/node_errors.h
+++ b/src/node_errors.h
@@ -158,8 +158,8 @@ inline v8::Local<v8::Value> ERR_STRING_TOO_LONG(v8::Isolate* isolate) {
 
 #define THROW_AND_RETURN_IF_NOT_STRING(env, val, prefix)                     \
   do {                                                                       \
-    if (!val->IsString())                                                    \
-      return node::THROW_ERR_INVALID_ARG_TYPE(env,                           \
+    if (!(val)->IsString())                                                  \
+      return node::THROW_ERR_INVALID_ARG_TYPE((env),                         \
                                               prefix " must be a string");   \
   } while (0)
 
diff --git a/src/node_options.cc b/src/node_options.cc
index 8b3a161..17a7e34 100644
--- a/src/node_options.cc
+++ b/src/node_options.cc
@@ -524,10 +524,12 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             "set default TLS minimum to TLSv1.2 (default: TLSv1.2)",
             &EnvironmentOptions::tls_min_v1_2,
             kAllowedInEnvironment);
+#ifdef TLS1_3_VERSION
   AddOption("--tls-min-v1.3",
             "set default TLS minimum to TLSv1.3 (default: TLSv1.2)",
             &EnvironmentOptions::tls_min_v1_3,
             kAllowedInEnvironment);
+#endif // TLS1_3_VERSION
   AddOption("--tls-max-v1.2",
             "set default TLS maximum to TLSv1.2 (default: TLSv1.3)",
             &EnvironmentOptions::tls_max_v1_2,
@@ -536,10 +538,12 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
   // - 11.x and below: TLS1.3 is opt-in with --tls-max-v1.3
   // - 12.x: TLS1.3 is opt-out with --tls-max-v1.2
   // In either case, support both options they are uniformly available.
+#ifdef TLS1_3_VERSION
   AddOption("--tls-max-v1.3",
             "set default TLS maximum to TLSv1.3 (default: TLSv1.3)",
             &EnvironmentOptions::tls_max_v1_3,
             kAllowedInEnvironment);
+#endif // TLS1_3_VERSION
 }
 
 PerIsolateOptionsParser::PerIsolateOptionsParser(
diff --git a/src/tls_wrap.cc b/src/tls_wrap.cc
index 39dcf53..8fda8b9 100644
--- a/src/tls_wrap.cc
+++ b/src/tls_wrap.cc
@@ -939,11 +939,13 @@ void TLSWrap::EnableSessionCallbacks(
 
 void TLSWrap::EnableKeylogCallback(
     const FunctionCallbackInfo<Value>& args) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
   TLSWrap* wrap;
   ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
   CHECK_NOT_NULL(wrap->sc_);
   SSL_CTX_set_keylog_callback(wrap->sc_->ctx_.get(),
       SSLWrap<TLSWrap>::KeylogCallback);
+#endif // OPENSSL_VERSION_NUMBER >= 0x10100000L
 }
 
 // Check required capabilities were not excluded from the OpenSSL build:
-- 
2.26.2