diff --git a/.travis.yml b/.travis.yml
index c770d989b..7d7253d6d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,6 @@ script:
 matrix:
   fast_finish: true
   include:
-    - env: RUBY_VERSION=ruby-2.3 OPENSSL_VERSION=openssl-1.0.0 OSSL_MDEBUG=1
     - env: RUBY_VERSION=ruby-2.3 OPENSSL_VERSION=openssl-1.0.1 OSSL_MDEBUG=1
     - env: RUBY_VERSION=ruby-2.3 OPENSSL_VERSION=openssl-1.0.2 OSSL_MDEBUG=1
     - env: RUBY_VERSION=ruby-2.3 OPENSSL_VERSION=openssl-1.1.0 OSSL_MDEBUG=1
diff --git a/History.md b/History.md
index 670fb32de..a49d271a8 100644
--- a/History.md
+++ b/History.md
@@ -4,10 +4,12 @@ Version 2.1.0
 Compatibility notes
 -------------------
 
+* Support for OpenSSL version 0.9.8 and 1.0.0 is completely removed.
+
 Supported platforms
 -------------------
 
-* OpenSSL 0.9.8, 1.0.0, 1.0.1, 1.0.2, 1.1.0
+* OpenSSL 1.0.1, 1.0.2, 1.1.0
 * LibreSSL 2.3, 2.4, 2.5
 * Ruby 2.3, 2.4
 
diff --git a/ext/openssl/extconf.rb b/ext/openssl/extconf.rb
index 7033b0e20..a30dd0810 100644
--- a/ext/openssl/extconf.rb
+++ b/ext/openssl/extconf.rb
@@ -47,15 +47,9 @@
   end
 end
 
-result = checking_for("OpenSSL version is 0.9.8 or later") {
-  try_static_assert("OPENSSL_VERSION_NUMBER >= 0x00908000L", "openssl/opensslv.h")
-}
-unless result
-  raise "OpenSSL 0.9.8 or later required."
-end
-
-unless OpenSSL.check_func("SSL_library_init()", "openssl/ssl.h")
-  raise "Ignore OpenSSL broken by Apple.\nPlease use another openssl. (e.g. using `configure --with-openssl-dir=/path/to/openssl')"
+unless checking_for("OpenSSL version is 1.0.1 or later") {
+    try_static_assert("OPENSSL_VERSION_NUMBER >= 0x10001000L", "openssl/opensslv.h") }
+  raise "OpenSSL >= 1.0.1 or LibreSSL is required"
 end
 
 Logging::message "=== Checking for OpenSSL features... ===\n"
@@ -78,30 +72,6 @@
   OpenSSL.check_func_or_macro("ENGINE_load_#{name}", "openssl/engine.h")
 }
 
-# added in 0.9.8X
-have_func("EVP_CIPHER_CTX_new")
-have_func("EVP_CIPHER_CTX_free")
-OpenSSL.check_func_or_macro("SSL_CTX_clear_options", "openssl/ssl.h")
-
-# added in 1.0.0
-have_func("ASN1_TIME_adj")
-have_func("EVP_CIPHER_CTX_copy")
-have_func("EVP_PKEY_base_id")
-have_func("HMAC_CTX_copy")
-have_func("PKCS5_PBKDF2_HMAC")
-have_func("X509_NAME_hash_old")
-have_func("X509_STORE_CTX_get0_current_crl")
-have_func("X509_STORE_set_verify_cb")
-have_func("i2d_ASN1_SET_ANY")
-have_func("SSL_SESSION_cmp") # removed
-OpenSSL.check_func_or_macro("SSL_set_tlsext_host_name", "openssl/ssl.h")
-have_struct_member("CRYPTO_THREADID", "ptr", "openssl/crypto.h")
-have_func("EVP_PKEY_get0")
-
-# added in 1.0.1
-have_func("SSL_CTX_set_next_proto_select_cb")
-have_macro("EVP_CTRL_GCM_GET_TAG", ['openssl/evp.h']) && $defs.push("-DHAVE_AUTHENTICATED_ENCRYPTION")
-
 # added in 1.0.2
 have_func("EC_curve_nist2nid")
 have_func("X509_REVOKED_dup")
diff --git a/ext/openssl/openssl_missing.c b/ext/openssl/openssl_missing.c
index 94ce85aff..b36ef0288 100644
--- a/ext/openssl/openssl_missing.c
+++ b/ext/openssl/openssl_missing.c
@@ -20,73 +20,6 @@
 
 #include "openssl_missing.h"
 
-/* added in 0.9.8X */
-#if !defined(HAVE_EVP_CIPHER_CTX_NEW)
-EVP_CIPHER_CTX *
-ossl_EVP_CIPHER_CTX_new(void)
-{
-    EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof(EVP_CIPHER_CTX));
-    if (!ctx)
-	return NULL;
-    EVP_CIPHER_CTX_init(ctx);
-    return ctx;
-}
-#endif
-
-#if !defined(HAVE_EVP_CIPHER_CTX_FREE)
-void
-ossl_EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
-{
-    if (ctx) {
-	EVP_CIPHER_CTX_cleanup(ctx);
-	OPENSSL_free(ctx);
-    }
-}
-#endif
-
-/* added in 1.0.0 */
-#if !defined(HAVE_EVP_CIPHER_CTX_COPY)
-/*
- * this function does not exist in OpenSSL yet... or ever?.
- * a future version may break this function.
- * tested on 0.9.7d.
- */
-int
-ossl_EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
-{
-    memcpy(out, in, sizeof(EVP_CIPHER_CTX));
-
-#if !defined(OPENSSL_NO_ENGINE)
-    if (in->engine) ENGINE_add(out->engine);
-    if (in->cipher_data) {
-	out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
-	memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
-    }
-#endif
-
-    return 1;
-}
-#endif
-
-#if !defined(OPENSSL_NO_HMAC)
-#if !defined(HAVE_HMAC_CTX_COPY)
-int
-ossl_HMAC_CTX_copy(HMAC_CTX *out, HMAC_CTX *in)
-{
-    if (!out || !in)
-	return 0;
-
-    memcpy(out, in, sizeof(HMAC_CTX));
-
-    EVP_MD_CTX_copy(&out->md_ctx, &in->md_ctx);
-    EVP_MD_CTX_copy(&out->i_ctx, &in->i_ctx);
-    EVP_MD_CTX_copy(&out->o_ctx, &in->o_ctx);
-
-    return 1;
-}
-#endif /* HAVE_HMAC_CTX_COPY */
-#endif /* NO_HMAC */
-
 /* added in 1.0.2 */
 #if !defined(OPENSSL_NO_EC)
 #if !defined(HAVE_EC_CURVE_NIST2NID)
diff --git a/ext/openssl/openssl_missing.h b/ext/openssl/openssl_missing.h
index 3d11aec2d..cc31f6ace 100644
--- a/ext/openssl/openssl_missing.h
+++ b/ext/openssl/openssl_missing.h
@@ -12,53 +12,6 @@
 
 #include "ruby/config.h"
 
-/* added in 0.9.8X */
-#if !defined(HAVE_EVP_CIPHER_CTX_NEW)
-EVP_CIPHER_CTX *ossl_EVP_CIPHER_CTX_new(void);
-#  define EVP_CIPHER_CTX_new ossl_EVP_CIPHER_CTX_new
-#endif
-
-#if !defined(HAVE_EVP_CIPHER_CTX_FREE)
-void ossl_EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *);
-#  define EVP_CIPHER_CTX_free ossl_EVP_CIPHER_CTX_free
-#endif
-
-#if !defined(HAVE_SSL_CTX_CLEAR_OPTIONS)
-#  define SSL_CTX_clear_options(ctx, op) ((ctx)->options &= ~(op))
-#endif
-
-/* added in 1.0.0 */
-#if !defined(HAVE_EVP_PKEY_BASE_ID)
-#  define EVP_PKEY_base_id(pkey) EVP_PKEY_type((pkey)->type)
-#endif
-
-#if !defined(HAVE_EVP_CIPHER_CTX_COPY)
-int ossl_EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *, const EVP_CIPHER_CTX *);
-#  define EVP_CIPHER_CTX_copy ossl_EVP_CIPHER_CTX_copy
-#endif
-
-#if !defined(HAVE_HMAC_CTX_COPY)
-int ossl_HMAC_CTX_copy(HMAC_CTX *out, HMAC_CTX *in);
-#  define HMAC_CTX_copy ossl_HMAC_CTX_copy
-#endif
-
-#if !defined(HAVE_X509_STORE_CTX_GET0_CURRENT_CRL)
-#  define X509_STORE_CTX_get0_current_crl(x) ((x)->current_crl)
-#endif
-
-#if !defined(HAVE_X509_STORE_SET_VERIFY_CB)
-#  define X509_STORE_set_verify_cb X509_STORE_set_verify_cb_func
-#endif
-
-#if !defined(HAVE_I2D_ASN1_SET_ANY)
-#  define i2d_ASN1_SET_ANY(sk, x) i2d_ASN1_SET_OF_ASN1_TYPE((sk), (x), \
-		i2d_ASN1_TYPE, V_ASN1_SET, V_ASN1_UNIVERSAL, 0)
-#endif
-
-#if !defined(HAVE_EVP_PKEY_GET0)
-#  define EVP_PKEY_get0(pk) (pk->pkey.ptr)
-#endif
-
 /* added in 1.0.2 */
 #if !defined(OPENSSL_NO_EC)
 #if !defined(HAVE_EC_CURVE_NIST2NID)
@@ -245,7 +198,7 @@ IMPL_PKEY_GETTER(EC_KEY, ec)
 #undef IMPL_KEY_ACCESSOR3
 #endif /* HAVE_OPAQUE_OPENSSL */
 
-#if defined(HAVE_AUTHENTICATED_ENCRYPTION) && !defined(EVP_CTRL_AEAD_GET_TAG)
+#if !defined(EVP_CTRL_AEAD_GET_TAG)
 #  define EVP_CTRL_AEAD_GET_TAG EVP_CTRL_GCM_GET_TAG
 #  define EVP_CTRL_AEAD_SET_TAG EVP_CTRL_GCM_SET_TAG
 #  define EVP_CTRL_AEAD_SET_IVLEN EVP_CTRL_GCM_SET_IVLEN
diff --git a/ext/openssl/ossl.c b/ext/openssl/ossl.c
index eb71b643b..a4fa0e73c 100644
--- a/ext/openssl/ossl.c
+++ b/ext/openssl/ossl.c
@@ -473,19 +473,11 @@ ossl_dyn_destroy_callback(struct CRYPTO_dynlock_value *l, const char *file, int
     OPENSSL_free(l);
 }
 
-#ifdef HAVE_CRYPTO_THREADID_PTR
 static void ossl_threadid_func(CRYPTO_THREADID *id)
 {
     /* register native thread id */
     CRYPTO_THREADID_set_pointer(id, (void *)rb_nativethread_self());
 }
-#else
-static unsigned long ossl_thread_id(void)
-{
-    /* before OpenSSL 1.0, this is 'unsigned long' */
-    return (unsigned long)rb_nativethread_self();
-}
-#endif
 
 static void Init_ossl_locks(void)
 {
@@ -503,11 +495,7 @@ static void Init_ossl_locks(void)
 	rb_nativethread_lock_initialize(&ossl_locks[i]);
     }
 
-#ifdef HAVE_CRYPTO_THREADID_PTR
     CRYPTO_THREADID_set_callback(ossl_threadid_func);
-#else
-    CRYPTO_set_id_callback(ossl_thread_id);
-#endif
     CRYPTO_set_locking_callback(ossl_lock_callback);
     CRYPTO_set_dynlock_create_callback(ossl_dyn_create_callback);
     CRYPTO_set_dynlock_lock_callback(ossl_dyn_lock_callback);
diff --git a/ext/openssl/ossl_asn1.c b/ext/openssl/ossl_asn1.c
index 534796f52..1977fdd2a 100644
--- a/ext/openssl/ossl_asn1.c
+++ b/ext/openssl/ossl_asn1.c
@@ -72,7 +72,6 @@ asn1time_to_time(const ASN1_TIME *time)
     return rb_funcall2(rb_cTime, rb_intern("utc"), 6, argv);
 }
 
-#if defined(HAVE_ASN1_TIME_ADJ)
 void
 ossl_time_split(VALUE time, time_t *sec, int *days)
 {
@@ -88,13 +87,6 @@ ossl_time_split(VALUE time, time_t *sec, int *days)
 	*sec = NUM2TIMET(rb_funcall(num, rb_intern("%"), 1, INT2FIX(86400)));
     }
 }
-#else
-time_t
-time_to_time_t(VALUE time)
-{
-    return (time_t)NUM2TIMET(rb_Integer(time));
-}
-#endif
 
 /*
  * STRING conversion
@@ -269,15 +261,10 @@ obj_to_asn1utime(VALUE time)
     time_t sec;
     ASN1_UTCTIME *t;
 
-#if defined(HAVE_ASN1_TIME_ADJ)
     int off_days;
 
     ossl_time_split(time, &sec, &off_days);
     if (!(t = ASN1_UTCTIME_adj(NULL, sec, off_days, 0)))
-#else
-    sec = time_to_time_t(time);
-    if (!(t = ASN1_UTCTIME_set(NULL, sec)))
-#endif
 	ossl_raise(eASN1Error, NULL);
 
     return t;
@@ -289,15 +276,10 @@ obj_to_asn1gtime(VALUE time)
     time_t sec;
     ASN1_GENERALIZEDTIME *t;
 
-#if defined(HAVE_ASN1_TIME_ADJ)
     int off_days;
 
     ossl_time_split(time, &sec, &off_days);
     if (!(t = ASN1_GENERALIZEDTIME_adj(NULL, sec, off_days, 0)))
-#else
-    sec = time_to_time_t(time);
-    if (!(t = ASN1_GENERALIZEDTIME_set(NULL, sec)))
-#endif
 	ossl_raise(eASN1Error, NULL);
 
     return t;
diff --git a/ext/openssl/ossl_asn1.h b/ext/openssl/ossl_asn1.h
index d6a170c86..939a96ce7 100644
--- a/ext/openssl/ossl_asn1.h
+++ b/ext/openssl/ossl_asn1.h
@@ -14,15 +14,11 @@
  * ASN1_DATE conversions
  */
 VALUE asn1time_to_time(const ASN1_TIME *);
-#if defined(HAVE_ASN1_TIME_ADJ)
 /* Splits VALUE to seconds and offset days. VALUE is typically a Time or an
  * Integer. This is used when updating ASN1_*TIME with ASN1_TIME_adj() or
  * X509_time_adj_ex(). We can't use ASN1_TIME_set() and X509_time_adj() because
  * they have the Year 2038 issue on sizeof(time_t) == 4 environment */
 void ossl_time_split(VALUE, time_t *, int *);
-#else
-time_t time_to_time_t(VALUE);
-#endif
 
 /*
  * ASN1_STRING conversions
diff --git a/ext/openssl/ossl_cipher.c b/ext/openssl/ossl_cipher.c
index 73b667b2c..aed7fbb44 100644
--- a/ext/openssl/ossl_cipher.c
+++ b/ext/openssl/ossl_cipher.c
@@ -512,10 +512,8 @@ ossl_cipher_set_iv(VALUE self, VALUE iv)
     StringValue(iv);
     GetCipher(self, ctx);
 
-#if defined(HAVE_AUTHENTICATED_ENCRYPTION)
     if (EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_FLAG_AEAD_CIPHER)
 	iv_len = (int)(VALUE)EVP_CIPHER_CTX_get_app_data(ctx);
-#endif
     if (!iv_len)
 	iv_len = EVP_CIPHER_CTX_iv_length(ctx);
     if (RSTRING_LEN(iv) != iv_len)
@@ -541,14 +539,9 @@ ossl_cipher_is_authenticated(VALUE self)
 
     GetCipher(self, ctx);
 
-#if defined(HAVE_AUTHENTICATED_ENCRYPTION)
     return (EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_FLAG_AEAD_CIPHER) ? Qtrue : Qfalse;
-#else
-    return Qfalse;
-#endif
 }
 
-#ifdef HAVE_AUTHENTICATED_ENCRYPTION
 /*
  *  call-seq:
  *     cipher.auth_data = string -> string
@@ -722,13 +715,6 @@ ossl_cipher_set_iv_length(VALUE self, VALUE iv_length)
 
     return iv_length;
 }
-#else
-#define ossl_cipher_set_auth_data rb_f_notimplement
-#define ossl_cipher_get_auth_tag rb_f_notimplement
-#define ossl_cipher_set_auth_tag rb_f_notimplement
-#define ossl_cipher_set_auth_tag_len rb_f_notimplement
-#define ossl_cipher_set_iv_length rb_f_notimplement
-#endif
 
 /*
  *  call-seq:
@@ -806,10 +792,8 @@ ossl_cipher_iv_length(VALUE self)
     int len = 0;
 
     GetCipher(self, ctx);
-#if defined(HAVE_AUTHENTICATED_ENCRYPTION)
     if (EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_FLAG_AEAD_CIPHER)
 	len = (int)(VALUE)EVP_CIPHER_CTX_get_app_data(ctx);
-#endif
     if (!len)
 	len = EVP_CIPHER_CTX_iv_length(ctx);
 
diff --git a/ext/openssl/ossl_pkcs5.c b/ext/openssl/ossl_pkcs5.c
index 47c5bfa3b..7811c5fe0 100644
--- a/ext/openssl/ossl_pkcs5.c
+++ b/ext/openssl/ossl_pkcs5.c
@@ -6,7 +6,6 @@
 VALUE mPKCS5;
 VALUE ePKCS5;
 
-#ifdef HAVE_PKCS5_PBKDF2_HMAC
 /*
  * call-seq:
  *    PKCS5.pbkdf2_hmac(pass, salt, iter, keylen, digest) => string
@@ -18,8 +17,6 @@ VALUE ePKCS5;
  * * +keylen+ - integer
  * * +digest+ - a string or OpenSSL::Digest object.
  *
- * Available in OpenSSL >= 1.0.0.
- *
  * Digests other than SHA1 may not be supported by other cryptography libraries.
  */
 static VALUE
@@ -43,10 +40,6 @@ ossl_pkcs5_pbkdf2_hmac(VALUE self, VALUE pass, VALUE salt, VALUE iter, VALUE key
 
     return str;
 }
-#else
-#define ossl_pkcs5_pbkdf2_hmac rb_f_notimplement
-#endif
-
 
 /*
  * call-seq:
@@ -99,8 +92,7 @@ Init_ossl_pkcs5(void)
      * slowed down artificially in order to render possible attacks infeasible.
      *
      * PKCS5 offers support for PBKDF2 with an OpenSSL::Digest::SHA1-based
-     * HMAC, or an arbitrary Digest if the underlying version of OpenSSL
-     * already supports it (>= 1.0.0).
+     * HMAC, or an arbitrary Digest.
      *
      * === Parameters
      * ==== Password
diff --git a/ext/openssl/ossl_pkey.c b/ext/openssl/ossl_pkey.c
index 6ab1b6184..e161277d2 100644
--- a/ext/openssl/ossl_pkey.c
+++ b/ext/openssl/ossl_pkey.c
@@ -92,7 +92,7 @@ pkey_new0(EVP_PKEY *pkey)
     case EVP_PKEY_DH:
 	return ossl_dh_new(pkey);
 #endif
-#if !defined(OPENSSL_NO_EC) && (OPENSSL_VERSION_NUMBER >= 0x0090802fL)
+#if !defined(OPENSSL_NO_EC)
     case EVP_PKEY_EC:
 	return ossl_ec_new(pkey);
 #endif
diff --git a/ext/openssl/ossl_pkey_dsa.c b/ext/openssl/ossl_pkey_dsa.c
index 85085419c..b21abc428 100644
--- a/ext/openssl/ossl_pkey_dsa.c
+++ b/ext/openssl/ossl_pkey_dsa.c
@@ -627,12 +627,6 @@ Init_ossl_dsa(void)
      * DSA, the Digital Signature Algorithm, is specified in NIST's
      * FIPS 186-3. It is an asymmetric public key algorithm that may be used
      * similar to e.g. RSA.
-     * Please note that for OpenSSL versions prior to 1.0.0 the digest
-     * algorithms OpenSSL::Digest::DSS (equivalent to SHA) or
-     * OpenSSL::Digest::DSS1 (equivalent to SHA-1) must be used for issuing
-     * signatures with a DSA key using OpenSSL::PKey#sign.
-     * Starting with OpenSSL 1.0.0, digest algorithms are no longer restricted,
-     * any Digest may be used for signing.
      */
     cDSA = rb_define_class_under(mPKey, "DSA", cPKey);
 
diff --git a/ext/openssl/ossl_pkey_ec.c b/ext/openssl/ossl_pkey_ec.c
index fc3f034a3..ce3475166 100644
--- a/ext/openssl/ossl_pkey_ec.c
+++ b/ext/openssl/ossl_pkey_ec.c
@@ -4,7 +4,7 @@
 
 #include "ossl.h"
 
-#if !defined(OPENSSL_NO_EC) && (OPENSSL_VERSION_NUMBER >= 0x0090802fL)
+#if !defined(OPENSSL_NO_EC)
 
 #define EXPORT_PEM 0
 #define EXPORT_DER 1
diff --git a/ext/openssl/ossl_ssl.c b/ext/openssl/ossl_ssl.c
index eef7dbece..a2520fe91 100644
--- a/ext/openssl/ossl_ssl.c
+++ b/ext/openssl/ossl_ssl.c
@@ -51,19 +51,19 @@ static ID id_i_io, id_i_context, id_i_hostname;
  */
 static const struct {
     const char *name;
-    SSL_METHOD *(*func)(void); /* FIXME: constify when dropping 0.9.8 */
+    const SSL_METHOD *(*func)(void);
     int version;
 } ossl_ssl_method_tab[] = {
 #if defined(HAVE_SSL_CTX_SET_MIN_PROTO_VERSION)
 #define OSSL_SSL_METHOD_ENTRY(name, version) \
-    { #name,          (SSL_METHOD *(*)(void))TLS_method, version }, \
-    { #name"_server", (SSL_METHOD *(*)(void))TLS_server_method, version }, \
-    { #name"_client", (SSL_METHOD *(*)(void))TLS_client_method, version }
+    { #name,          TLS_method, version }, \
+    { #name"_server", TLS_server_method, version }, \
+    { #name"_client", TLS_client_method, version }
 #else
 #define OSSL_SSL_METHOD_ENTRY(name, version) \
-    { #name,          (SSL_METHOD *(*)(void))name##_method, version }, \
-    { #name"_server", (SSL_METHOD *(*)(void))name##_server_method, version }, \
-    { #name"_client", (SSL_METHOD *(*)(void))name##_client_method, version }
+    { #name,          name##_method, version }, \
+    { #name"_server", name##_server_method, version }, \
+    { #name"_client", name##_client_method, version }
 #endif
 #if defined(HAVE_SSLV2_METHOD)
     OSSL_SSL_METHOD_ENTRY(SSLv2, SSL2_VERSION),
@@ -109,14 +109,12 @@ static VALUE
 ossl_sslctx_s_alloc(VALUE klass)
 {
     SSL_CTX *ctx;
-    long mode = SSL_MODE_ENABLE_PARTIAL_WRITE |
-	SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
+    long mode = 0 |
+	SSL_MODE_ENABLE_PARTIAL_WRITE |
+	SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
+	SSL_MODE_RELEASE_BUFFERS;
     VALUE obj;
 
-#ifdef SSL_MODE_RELEASE_BUFFERS
-    mode |= SSL_MODE_RELEASE_BUFFERS;
-#endif
-
     obj = TypedData_Wrap_Struct(klass, &ossl_sslctx_type, 0);
     ctx = SSL_CTX_new(SSLv23_method());
     if (!ctx) {
@@ -168,7 +166,7 @@ ossl_sslctx_set_ssl_version(VALUE self, VALUE ssl_method)
 #if defined(HAVE_SSL_CTX_SET_MIN_PROTO_VERSION)
 	    int version = ossl_ssl_method_tab[i].version;
 #endif
-	    SSL_METHOD *method = ossl_ssl_method_tab[i].func();
+	    const SSL_METHOD *method = ossl_ssl_method_tab[i].func();
 
 	    if (SSL_CTX_set_ssl_version(ctx, method) != 1)
 		ossl_raise(eSSLError, "SSL_CTX_set_ssl_version");
@@ -514,7 +512,6 @@ ossl_sslctx_add_extra_chain_cert_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, arg))
 
 static VALUE ossl_sslctx_setup(VALUE self);
 
-#ifdef HAVE_SSL_SET_TLSEXT_HOST_NAME
 static VALUE
 ossl_call_servername_cb(VALUE ary)
 {
@@ -571,7 +568,6 @@ ssl_servername_cb(SSL *ssl, int *ad, void *arg)
 
     return SSL_TLSEXT_ERR_OK;
 }
-#endif
 
 static void
 ssl_renegotiation_cb(const SSL *ssl)
@@ -944,13 +940,11 @@ ossl_sslctx_setup(VALUE self)
 	OSSL_Debug("SSL SESSION remove callback added");
     }
 
-#ifdef HAVE_SSL_SET_TLSEXT_HOST_NAME
     val = rb_attr_get(self, id_i_servername_cb);
     if (!NIL_P(val)) {
         SSL_CTX_set_tlsext_servername_callback(ctx, ssl_servername_cb);
 	OSSL_Debug("SSL TLSEXT servername callback added");
     }
-#endif
 
     return Qtrue;
 }
@@ -2092,7 +2086,6 @@ ossl_ssl_set_session(VALUE self, VALUE arg1)
     return arg1;
 }
 
-#ifdef HAVE_SSL_SET_TLSEXT_HOST_NAME
 /*
  * call-seq:
  *    ssl.hostname = hostname -> hostname
@@ -2119,7 +2112,6 @@ ossl_ssl_set_hostname(VALUE self, VALUE arg)
 
     return arg;
 }
-#endif
 
 /*
  * call-seq:
@@ -2437,11 +2429,7 @@ Init_ossl_ssl(void)
      */
     rb_attr(cSSLContext, rb_intern("session_remove_cb"), 1, 1, Qfalse);
 
-#ifdef HAVE_SSL_SET_TLSEXT_HOST_NAME
     rb_define_const(mSSLExtConfig, "HAVE_TLSEXT_HOST_NAME", Qtrue);
-#else
-    rb_define_const(mSSLExtConfig, "HAVE_TLSEXT_HOST_NAME", Qfalse);
-#endif
 
 #ifdef TLS_DH_anon_WITH_AES_256_GCM_SHA384
     rb_define_const(mSSLExtConfig, "TLS_DH_anon_WITH_AES_256_GCM_SHA384", Qtrue);
@@ -2646,10 +2634,8 @@ Init_ossl_ssl(void)
     rb_define_method(cSSLSocket, "session=",    ossl_ssl_set_session, 1);
     rb_define_method(cSSLSocket, "verify_result", ossl_ssl_get_verify_result, 0);
     rb_define_method(cSSLSocket, "client_ca", ossl_ssl_get_client_ca_list, 0);
-#ifdef HAVE_SSL_SET_TLSEXT_HOST_NAME
     /* #hostname is defined in lib/openssl/ssl.rb */
     rb_define_method(cSSLSocket, "hostname=", ossl_ssl_set_hostname, 1);
-#endif
 # ifdef HAVE_SSL_GET_SERVER_TMP_KEY
     rb_define_method(cSSLSocket, "tmp_key", ossl_ssl_tmp_key, 0);
 # endif
@@ -2691,18 +2677,10 @@ Init_ossl_ssl(void)
     ossl_ssl_def_const(OP_NO_SSLv2);
     ossl_ssl_def_const(OP_NO_SSLv3);
     ossl_ssl_def_const(OP_NO_TLSv1);
-#if defined(SSL_OP_NO_TLSv1_1)
     ossl_ssl_def_const(OP_NO_TLSv1_1);
-#endif
-#if defined(SSL_OP_NO_TLSv1_2)
     ossl_ssl_def_const(OP_NO_TLSv1_2);
-#endif
-#if defined(SSL_OP_NO_TICKET)
     ossl_ssl_def_const(OP_NO_TICKET);
-#endif
-#if defined(SSL_OP_NO_COMPRESSION)
     ossl_ssl_def_const(OP_NO_COMPRESSION);
-#endif
     ossl_ssl_def_const(OP_PKCS1_CHECK_1);
     ossl_ssl_def_const(OP_PKCS1_CHECK_2);
     ossl_ssl_def_const(OP_NETSCAPE_CA_DN_BUG);
diff --git a/ext/openssl/ossl_ssl_session.c b/ext/openssl/ossl_ssl_session.c
index 1b602a6cd..fefbf28b3 100644
--- a/ext/openssl/ossl_ssl_session.c
+++ b/ext/openssl/ossl_ssl_session.c
@@ -93,8 +93,8 @@ ossl_ssl_session_initialize_copy(VALUE self, VALUE other)
     return self;
 }
 
-#if !defined(HAVE_SSL_SESSION_CMP)
-int ossl_SSL_SESSION_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
+static int
+ossl_SSL_SESSION_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
 {
     unsigned int a_len;
     const unsigned char *a_sid = SSL_SESSION_get_id(a, &a_len);
@@ -108,8 +108,6 @@ int ossl_SSL_SESSION_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
 
     return CRYPTO_memcmp(a_sid, b_sid, a_len);
 }
-#define SSL_SESSION_cmp(a, b) ossl_SSL_SESSION_cmp(a, b)
-#endif
 
 /*
  * call-seq:
@@ -124,7 +122,7 @@ static VALUE ossl_ssl_session_eq(VALUE val1, VALUE val2)
 	GetSSLSession(val1, ctx1);
 	SafeGetSSLSession(val2, ctx2);
 
-	switch (SSL_SESSION_cmp(ctx1, ctx2)) {
+	switch (ossl_SSL_SESSION_cmp(ctx1, ctx2)) {
 	case 0:		return Qtrue;
 	default:	return Qfalse;
 	}
diff --git a/ext/openssl/ossl_x509.c b/ext/openssl/ossl_x509.c
index 19ec274ae..8a061b068 100644
--- a/ext/openssl/ossl_x509.c
+++ b/ext/openssl/ossl_x509.c
@@ -20,15 +20,10 @@ ossl_x509_time_adjust(ASN1_TIME *s, VALUE time)
 {
     time_t sec;
 
-#if defined(HAVE_ASN1_TIME_ADJ)
     int off_days;
 
     ossl_time_split(time, &sec, &off_days);
     return X509_time_adj_ex(s, off_days, 0, &sec);
-#else
-    sec = time_to_time_t(time);
-    return X509_time_adj(s, 0, &sec);
-#endif
 }
 
 void
@@ -112,21 +107,15 @@ Init_ossl_x509(void)
     DefX509Const(V_FLAG_INHIBIT_MAP);
     /* Set by Store#flags= and StoreContext#flags=. */
     DefX509Const(V_FLAG_NOTIFY_POLICY);
-#if defined(X509_V_FLAG_EXTENDED_CRL_SUPPORT)
     /* Set by Store#flags= and StoreContext#flags=. Enables some additional
      * features including support for indirect signed CRLs. */
     DefX509Const(V_FLAG_EXTENDED_CRL_SUPPORT);
-#endif
-#if defined(X509_V_FLAG_USE_DELTAS)
     /* Set by Store#flags= and StoreContext#flags=. Uses delta CRLs. If not
      * specified, deltas are ignored. */
     DefX509Const(V_FLAG_USE_DELTAS);
-#endif
-#if defined(X509_V_FLAG_CHECK_SS_SIGNATURE)
     /* Set by Store#flags= and StoreContext#flags=. Enables checking of the
      * signature of the root self-signed CA. */
     DefX509Const(V_FLAG_CHECK_SS_SIGNATURE);
-#endif
 #if defined(X509_V_FLAG_TRUSTED_FIRST)
     /* Set by Store#flags= and StoreContext#flags=. When constructing a
      * certificate chain, search the Store first for the issuer certificate.
@@ -161,10 +150,8 @@ Init_ossl_x509(void)
     DefX509Const(PURPOSE_ANY);
     /* Set by Store#purpose=. OCSP helper. */
     DefX509Const(PURPOSE_OCSP_HELPER);
-#if defined(X509_PURPOSE_TIMESTAMP_SIGN)
     /* Set by Store#purpose=. Time stamps signer. */
     DefX509Const(PURPOSE_TIMESTAMP_SIGN);
-#endif
 
     DefX509Const(TRUST_COMPAT);
     DefX509Const(TRUST_SSL_CLIENT);
@@ -173,9 +160,7 @@ Init_ossl_x509(void)
     DefX509Const(TRUST_OBJECT_SIGN);
     DefX509Const(TRUST_OCSP_SIGN);
     DefX509Const(TRUST_OCSP_REQUEST);
-#if defined(X509_TRUST_TSA)
     DefX509Const(TRUST_TSA);
-#endif
 
     DefX509Default(CERT_AREA, cert_area);
     DefX509Default(CERT_DIR, cert_dir);
diff --git a/ext/openssl/ossl_x509name.c b/ext/openssl/ossl_x509name.c
index 4523e0d71..56816bdc7 100644
--- a/ext/openssl/ossl_x509name.c
+++ b/ext/openssl/ossl_x509name.c
@@ -398,7 +398,6 @@ ossl_x509name_hash(VALUE self)
     return ULONG2NUM(hash);
 }
 
-#ifdef HAVE_X509_NAME_HASH_OLD
 /*
  * call-seq:
  *    name.hash_old => integer
@@ -417,7 +416,6 @@ ossl_x509name_hash_old(VALUE self)
 
     return ULONG2NUM(hash);
 }
-#endif
 
 /*
  * call-seq:
@@ -486,9 +484,7 @@ Init_ossl_x509name(void)
     rb_define_alias(cX509Name, "<=>", "cmp");
     rb_define_method(cX509Name, "eql?", ossl_x509name_eql, 1);
     rb_define_method(cX509Name, "hash", ossl_x509name_hash, 0);
-#ifdef HAVE_X509_NAME_HASH_OLD
     rb_define_method(cX509Name, "hash_old", ossl_x509name_hash_old, 0);
-#endif
     rb_define_method(cX509Name, "to_der", ossl_x509name_to_der, 0);
 
     utf8str = INT2NUM(V_ASN1_UTF8STRING);
diff --git a/lib/openssl/digest.rb b/lib/openssl/digest.rb
index 97ccbc956..b57292400 100644
--- a/lib/openssl/digest.rb
+++ b/lib/openssl/digest.rb
@@ -15,13 +15,10 @@
 module OpenSSL
   class Digest
 
-    alg = %w(MD2 MD4 MD5 MDC2 RIPEMD160 SHA1)
+    alg = %w(MD2 MD4 MD5 MDC2 RIPEMD160 SHA1 SHA224 SHA256 SHA384 SHA512)
     if OPENSSL_VERSION_NUMBER < 0x10100000
       alg += %w(DSS DSS1 SHA)
     end
-    if OPENSSL_VERSION_NUMBER > 0x00908000
-      alg += %w(SHA224 SHA256 SHA384 SHA512)
-    end
 
     # Return the +data+ hash computed with +name+ Digest. +name+ is either the
     # long name or short name of a supported digest algorithm.
diff --git a/lib/openssl/ssl.rb b/lib/openssl/ssl.rb
index f40a45143..73f4cdde5 100644
--- a/lib/openssl/ssl.rb
+++ b/lib/openssl/ssl.rb
@@ -23,7 +23,7 @@ class SSLContext
         :options => -> {
           opts = OpenSSL::SSL::OP_ALL
           opts &= ~OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS
-          opts |= OpenSSL::SSL::OP_NO_COMPRESSION if defined?(OpenSSL::SSL::OP_NO_COMPRESSION)
+          opts |= OpenSSL::SSL::OP_NO_COMPRESSION
           opts |= OpenSSL::SSL::OP_NO_SSLv2 | OpenSSL::SSL::OP_NO_SSLv3
           opts
         }.call
@@ -87,7 +87,7 @@ class SSLContext
       #
       # The callback is invoked with an SSLSocket and a server name.  The
       # callback must return an SSLContext for the server name or nil.
-      attr_accessor :servername_cb if ExtConfig::HAVE_TLSEXT_HOST_NAME
+      attr_accessor :servername_cb
 
       # call-seq:
       #    SSLContext.new => ctx
@@ -242,9 +242,7 @@ class SSLSocket
       include Buffering
       include SocketForwarder
 
-      if ExtConfig::HAVE_TLSEXT_HOST_NAME
-        attr_reader :hostname
-      end
+      attr_reader :hostname
 
       # The underlying IO object.
       attr_reader :io
diff --git a/test/test_asn1.rb b/test/test_asn1.rb
index a0ac1ddbf..b14ebd554 100644
--- a/test/test_asn1.rb
+++ b/test/test_asn1.rb
@@ -576,4 +576,4 @@ def assert_universal(tag, asn1)
     assert_equal(:UNIVERSAL, asn1.tag_class)
   end
 
-end if defined?(OpenSSL::TestUtils)
+end
diff --git a/test/test_bn.rb b/test/test_bn.rb
index 37ba5e559..57755d04f 100644
--- a/test/test_bn.rb
+++ b/test/test_bn.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestBN < OpenSSL::TestCase
   def test_new_str
     e1 = OpenSSL::BN.new(999.to_s(16), 16) # OpenSSL::BN.new(str, 16) must be most stable
@@ -57,5 +55,3 @@ def test_cmp
     assert_not_equal(bn3.hash, bn1.hash)
   end
 end
-
-end
diff --git a/test/test_buffering.rb b/test/test_buffering.rb
index f85353fc6..73cfa9d81 100644
--- a/test/test_buffering.rb
+++ b/test/test_buffering.rb
@@ -86,4 +86,4 @@ def test_each_byte
     assert_equal([97, 98, 99], res)
   end
 
-end if defined?(OpenSSL::TestUtils)
+end
diff --git a/test/test_cipher.rb b/test/test_cipher.rb
index ad0e87b44..ce64fbb9f 100644
--- a/test/test_cipher.rb
+++ b/test/test_cipher.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestCipher < OpenSSL::TestCase
   module Helper
     def has_cipher?(name)
@@ -129,7 +127,7 @@ def test_ctr_if_exists
     assert_equal ct, cipher.update(pt) << cipher.final
     cipher = new_decryptor("aes-128-ctr", key: key, iv: iv, padding: 0)
     assert_equal pt, cipher.update(ct) << cipher.final
-  end if has_cipher?('aes-128-ctr')
+  end
 
   def test_ciphers
     OpenSSL::Cipher.ciphers.each{|name|
@@ -165,10 +163,8 @@ def test_update_raise_if_key_not_set
   end
 
   def test_authenticated
-    if has_cipher?('aes-128-gcm')
-      cipher = OpenSSL::Cipher.new('aes-128-gcm')
-      assert_predicate(cipher, :authenticated?)
-    end
+    cipher = OpenSSL::Cipher.new('aes-128-gcm')
+    assert_predicate(cipher, :authenticated?)
     cipher = OpenSSL::Cipher.new('aes-128-cbc')
     assert_not_predicate(cipher, :authenticated?)
   end
@@ -220,7 +216,7 @@ def test_aes_gcm
     cipher = new_decryptor("aes-128-gcm", key: key, iv: iv, auth_tag: tag, auth_data: aad)
     cipher.update(ct2)
     assert_raise(OpenSSL::Cipher::CipherError) { cipher.final }
-  end if has_cipher?("aes-128-gcm")
+  end
 
   def test_aes_gcm_variable_iv_len
     # GCM spec Appendix B Test Case 5
@@ -243,7 +239,7 @@ def test_aes_gcm_variable_iv_len
     assert_equal tag, cipher.auth_tag
     cipher = new_decryptor("aes-128-gcm", key: key, iv_len: 8, iv: iv, auth_tag: tag, auth_data: aad)
     assert_equal pt, cipher.update(ct) << cipher.final
-  end if has_cipher?("aes-128-gcm")
+  end
 
   def test_aes_ocb_tag_len
     # RFC 7253 Appendix A; the second sample
@@ -295,7 +291,7 @@ def test_aes_gcm_key_iv_order_issue
 
     assert_equal ct1, ct2
     assert_equal tag1, tag2
-  end if has_cipher?("aes-128-gcm")
+  end
 
   private
 
@@ -314,5 +310,3 @@ def new_decryptor(algo, **kwargs)
   end
 
 end
-
-end
diff --git a/test/test_config.rb b/test/test_config.rb
index 786bce9d2..42f9d3c51 100644
--- a/test/test_config.rb
+++ b/test/test_config.rb
@@ -297,4 +297,4 @@ def test_clone
     @it['newsection'] = {'a' => 'b'}
     assert_not_equal(@it.sections.sort, c.sections.sort)
   end
-end if defined?(OpenSSL::TestUtils)
+end
diff --git a/test/test_digest.rb b/test/test_digest.rb
index 9891d99ae..e81d618d4 100644
--- a/test/test_digest.rb
+++ b/test/test_digest.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestDigest < OpenSSL::TestCase
   def setup
     super
@@ -54,13 +52,10 @@ def test_reset
   end
 
   def test_digest_constants
-    algs = %w(MD4 MD5 RIPEMD160 SHA1)
+    algs = %w(MD4 MD5 RIPEMD160 SHA1 SHA224 SHA256 SHA384 SHA512)
     if OpenSSL::OPENSSL_VERSION_NUMBER < 0x10100000
       algs += %w(DSS1 SHA)
     end
-    if OpenSSL::OPENSSL_VERSION_NUMBER > 0x00908000
-      algs += %w(SHA224 SHA256 SHA384 SHA512)
-    end
     algs.each do |alg|
       assert_not_nil(OpenSSL::Digest.new(alg))
       klass = OpenSSL::Digest.const_get(alg)
@@ -73,34 +68,32 @@ def test_digest_by_oid_and_name
     check_digest(OpenSSL::ASN1::ObjectId.new("SHA1"))
   end
 
-  if OpenSSL::OPENSSL_VERSION_NUMBER > 0x00908000
-    def encode16(str)
-      str.unpack("H*").first
-    end
+  def encode16(str)
+    str.unpack("H*").first
+  end
 
-    def test_098_features
-      sha224_a = "abd37534c7d9a2efb9465de931cd7055ffdb8879563ae98078d6d6d5"
-      sha256_a = "ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb"
-      sha384_a = "54a59b9f22b0b80880d8427e548b7c23abd873486e1f035dce9cd697e85175033caa88e6d57bc35efae0b5afd3145f31"
-      sha512_a = "1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75"
-
-      assert_equal(sha224_a, OpenSSL::Digest::SHA224.hexdigest("a"))
-      assert_equal(sha256_a, OpenSSL::Digest::SHA256.hexdigest("a"))
-      assert_equal(sha384_a, OpenSSL::Digest::SHA384.hexdigest("a"))
-      assert_equal(sha512_a, OpenSSL::Digest::SHA512.hexdigest("a"))
-
-      assert_equal(sha224_a, encode16(OpenSSL::Digest::SHA224.digest("a")))
-      assert_equal(sha256_a, encode16(OpenSSL::Digest::SHA256.digest("a")))
-      assert_equal(sha384_a, encode16(OpenSSL::Digest::SHA384.digest("a")))
-      assert_equal(sha512_a, encode16(OpenSSL::Digest::SHA512.digest("a")))
-    end
+  def test_sha2
+    sha224_a = "abd37534c7d9a2efb9465de931cd7055ffdb8879563ae98078d6d6d5"
+    sha256_a = "ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb"
+    sha384_a = "54a59b9f22b0b80880d8427e548b7c23abd873486e1f035dce9cd697e85175033caa88e6d57bc35efae0b5afd3145f31"
+    sha512_a = "1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75"
+
+    assert_equal(sha224_a, OpenSSL::Digest::SHA224.hexdigest("a"))
+    assert_equal(sha256_a, OpenSSL::Digest::SHA256.hexdigest("a"))
+    assert_equal(sha384_a, OpenSSL::Digest::SHA384.hexdigest("a"))
+    assert_equal(sha512_a, OpenSSL::Digest::SHA512.hexdigest("a"))
+
+    assert_equal(sha224_a, encode16(OpenSSL::Digest::SHA224.digest("a")))
+    assert_equal(sha256_a, encode16(OpenSSL::Digest::SHA256.digest("a")))
+    assert_equal(sha384_a, encode16(OpenSSL::Digest::SHA384.digest("a")))
+    assert_equal(sha512_a, encode16(OpenSSL::Digest::SHA512.digest("a")))
+  end
 
-    def test_digest_by_oid_and_name_sha2
-      check_digest(OpenSSL::ASN1::ObjectId.new("SHA224"))
-      check_digest(OpenSSL::ASN1::ObjectId.new("SHA256"))
-      check_digest(OpenSSL::ASN1::ObjectId.new("SHA384"))
-      check_digest(OpenSSL::ASN1::ObjectId.new("SHA512"))
-    end
+  def test_digest_by_oid_and_name_sha2
+    check_digest(OpenSSL::ASN1::ObjectId.new("SHA224"))
+    check_digest(OpenSSL::ASN1::ObjectId.new("SHA256"))
+    check_digest(OpenSSL::ASN1::ObjectId.new("SHA384"))
+    check_digest(OpenSSL::ASN1::ObjectId.new("SHA512"))
   end
 
   def test_openssl_digest
@@ -121,14 +114,4 @@ def check_digest(oid)
     d = OpenSSL::Digest.new(oid.oid)
     assert_not_nil(d)
   end
-
-  def libressl?
-    OpenSSL::OPENSSL_VERSION.include?('LibreSSL')
-  end
-
-  def version_since(verary)
-    (OpenSSL::OPENSSL_LIBRARY_VERSION.scan(/\d+/).map(&:to_i) <=> verary) != -1
-  end
-end
-
 end
diff --git a/test/test_engine.rb b/test/test_engine.rb
index 75e45eb7f..a987f2676 100644
--- a/test/test_engine.rb
+++ b/test/test_engine.rb
@@ -96,4 +96,4 @@ def crypt_data(data, key, mode)
     end
   end
 
-end if defined?(OpenSSL::TestUtils) && defined?(OpenSSL::Engine)
+end if defined?(OpenSSL::Engine)
diff --git a/test/test_fips.rb b/test/test_fips.rb
index 534dade02..9ba352cbb 100644
--- a/test/test_fips.rb
+++ b/test/test_fips.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestFIPS < OpenSSL::TestCase
 
   def test_fips_mode_is_reentrant
@@ -11,5 +9,3 @@ def test_fips_mode_is_reentrant
   end
 
 end
-
-end
diff --git a/test/test_hmac.rb b/test/test_hmac.rb
index dbde97d9c..86857ba08 100644
--- a/test/test_hmac.rb
+++ b/test/test_hmac.rb
@@ -37,4 +37,4 @@ def test_reset_keep_key
     second = h1.update("test").hexdigest
     assert_equal first, second
   end
-end if defined?(OpenSSL::TestUtils)
+end
diff --git a/test/test_ns_spki.rb b/test/test_ns_spki.rb
index ac34613fc..b75906b21 100644
--- a/test/test_ns_spki.rb
+++ b/test/test_ns_spki.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestNSSPI < OpenSSL::TestCase
   def setup
     super
@@ -49,5 +47,3 @@ def test_decode_data
     assert_equal(OpenSSL::PKey::RSA, spki.public_key.class)
   end
 end
-
-end
diff --git a/test/test_ocsp.rb b/test/test_ocsp.rb
index 8881f25dd..7da929c05 100644
--- a/test/test_ocsp.rb
+++ b/test/test_ocsp.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestOCSP < OpenSSL::TestCase
   def setup
     super
@@ -294,5 +292,3 @@ def test_response_dup
     assert_equal res.to_der, res.dup.to_der
   end
 end
-
-end
diff --git a/test/test_pair.rb b/test/test_pair.rb
index 9a5205f81..ad3897876 100644
--- a/test/test_pair.rb
+++ b/test/test_pair.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 require 'socket'
 require_relative 'ut_eof'
 
@@ -489,5 +487,3 @@ class OpenSSL::TestPairLowlevelSocket < OpenSSL::TestCase
   include OpenSSL::SSLPairLowlevelSocket
   include OpenSSL::TestPairM
 end
-
-end
diff --git a/test/test_pkcs12.rb b/test/test_pkcs12.rb
index 403718b94..d4556cd7d 100644
--- a/test/test_pkcs12.rb
+++ b/test/test_pkcs12.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 module OpenSSL
   class TestPKCS12 < OpenSSL::TestCase
     include OpenSSL::TestUtils
@@ -311,5 +309,3 @@ def assert_include_cert cert, ary
 
   end
 end
-
-end
diff --git a/test/test_pkcs5.rb b/test/test_pkcs5.rb
index ad8132c26..59a7e7c92 100644
--- a/test/test_pkcs5.rb
+++ b/test/test_pkcs5.rb
@@ -93,6 +93,6 @@ def test_pbkdf2_hmac_sha256_c_20000_len_32
     value1 = OpenSSL::PKCS5.pbkdf2_hmac(p, s, c, dk_len, digest)
     value2 = OpenSSL::PKCS5.pbkdf2_hmac(p, s, c, dk_len, digest)
     assert_equal(value1, value2)
-  end if OpenSSL::PKCS5.respond_to?(:pbkdf2_hmac)
+  end
 
-end if defined?(OpenSSL::TestUtils)
+end
diff --git a/test/test_pkcs7.rb b/test/test_pkcs7.rb
index 48d599975..127111448 100644
--- a/test/test_pkcs7.rb
+++ b/test/test_pkcs7.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestPKCS7 < OpenSSL::TestCase
   def setup
     super
@@ -285,5 +283,3 @@ def test_split_content
     assert_equal(pki_message_content_pem, p7enc.to_pem)
   end
 end
-
-end
diff --git a/test/test_pkey_dh.rb b/test/test_pkey_dh.rb
index 470c952e2..533aaa7ef 100644
--- a/test/test_pkey_dh.rb
+++ b/test/test_pkey_dh.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestPKeyDH < OpenSSL::PKeyTestCase
   DH1024 = OpenSSL::TestUtils::TEST_KEY_DH1024
 
@@ -116,5 +114,3 @@ def assert_same_dh(expected, key)
     check_component(expected, key, [:p, :q, :g, :pub_key, :priv_key])
   end
 end
-
-end
diff --git a/test/test_pkey_dsa.rb b/test/test_pkey_dsa.rb
index a4ccd1d8f..4e36400b2 100644
--- a/test/test_pkey_dsa.rb
+++ b/test/test_pkey_dsa.rb
@@ -2,8 +2,6 @@
 require_relative 'utils'
 require 'base64'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestPKeyDSA < OpenSSL::PKeyTestCase
   DSA512 = OpenSSL::TestUtils::TEST_KEY_DSA512
 
@@ -43,7 +41,6 @@ def test_sign_verify
       assert_equal true, DSA512.verify(OpenSSL::Digest::DSS1.new, signature, data)
     end
 
-    return if OpenSSL::OPENSSL_VERSION_NUMBER <= 0x010000000
     signature = DSA512.sign("SHA1", data)
     assert_equal true, DSA512.verify("SHA1", signature, data)
 
@@ -196,5 +193,3 @@ def assert_same_dsa(expected, key)
     check_component(expected, key, [:p, :q, :g, :pub_key, :priv_key])
   end
 end
-
-end
diff --git a/test/test_pkey_ec.rb b/test/test_pkey_ec.rb
index e281f80ca..badaff713 100644
--- a/test/test_pkey_ec.rb
+++ b/test/test_pkey_ec.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils) && defined?(OpenSSL::PKey::EC)
+if defined?(OpenSSL::PKey::EC)
 
 class OpenSSL::TestEC < OpenSSL::PKeyTestCase
   P256 = OpenSSL::TestUtils::TEST_KEY_EC_P256V1
@@ -100,16 +100,9 @@ def test_dsa_sign_asn1_FIPS186_3
     key = OpenSSL::PKey::EC.new("prime256v1").generate_key!
     size = key.group.order.num_bits / 8 + 1
     dgst = (1..size).to_a.pack('C*')
-    begin
-      sig = key.dsa_sign_asn1(dgst)
-      # dgst is auto-truncated according to FIPS186-3 after openssl-0.9.8m
-      assert(key.dsa_verify_asn1(dgst + "garbage", sig))
-    rescue OpenSSL::PKey::ECError => e
-      # just an exception for longer dgst before openssl-0.9.8m
-      assert_equal('ECDSA_sign: data too large for key size', e.message)
-      # no need to do following tests
-      return
-    end
+    sig = key.dsa_sign_asn1(dgst)
+    # dgst is auto-truncated according to FIPS186-3 after openssl-0.9.8m
+    assert(key.dsa_verify_asn1(dgst + "garbage", sig))
   end
 
   def test_dh_compute_key
diff --git a/test/test_pkey_rsa.rb b/test/test_pkey_rsa.rb
index b24f1d550..ebde6328c 100644
--- a/test/test_pkey_rsa.rb
+++ b/test/test_pkey_rsa.rb
@@ -2,8 +2,6 @@
 require_relative 'utils'
 require 'base64'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestPKeyRSA < OpenSSL::PKeyTestCase
   RSA1024 = OpenSSL::TestUtils::TEST_KEY_RSA1024
 
@@ -255,5 +253,3 @@ def assert_same_rsa(expected, key)
     check_component(expected, key, [:n, :e, :d, :p, :q, :dmp1, :dmq1, :iqmp])
   end
 end
-
-end
diff --git a/test/test_random.rb b/test/test_random.rb
index 607946192..dd72d84dc 100644
--- a/test/test_random.rb
+++ b/test/test_random.rb
@@ -12,4 +12,4 @@ def test_pseudo_bytes
     assert_equal("", OpenSSL::Random.pseudo_bytes(0))
     assert_equal(12, OpenSSL::Random.pseudo_bytes(12).bytesize)
   end if OpenSSL::Random.methods.include?(:pseudo_bytes)
-end if defined?(OpenSSL::TestCase)
+end
diff --git a/test/test_ssl.rb b/test/test_ssl.rb
index 8d74f25f5..382627a42 100644
--- a/test/test_ssl.rb
+++ b/test/test_ssl.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestSSL < OpenSSL::SSLTestCase
 
   def test_ctx_options
@@ -352,10 +350,8 @@ def test_sslctx_set_params
     assert ciphers_names.all?{|v| /A(EC)?DH/ !~ v }, "anon ciphers are disabled"
     assert ciphers_names.all?{|v| /(RC4|MD5|EXP|DES)/ !~ v }, "weak ciphers are disabled"
     assert_equal 0, ctx.options & OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS
-    if defined?(OpenSSL::SSL::OP_NO_COMPRESSION) # >= 1.0.0
-      assert_equal OpenSSL::SSL::OP_NO_COMPRESSION,
-                   ctx.options & OpenSSL::SSL::OP_NO_COMPRESSION
-    end
+    assert_equal OpenSSL::SSL::OP_NO_COMPRESSION,
+                 ctx.options & OpenSSL::SSL::OP_NO_COMPRESSION
   end
 
   def test_post_connect_check_with_anon_ciphers
@@ -845,7 +841,7 @@ def test_tls_v1_2
       ctx.ssl_version = :TLSv1_2_client
       server_connect(port, ctx) { |ssl| assert_equal("TLSv1.2", ssl.ssl_version) }
     }
-  end if OpenSSL::OPENSSL_VERSION_NUMBER > 0x10001000
+  end
 
   def test_forbid_tls_v1_1_for_client
     ctx_proc = Proc.new { |ctx| ctx.options = OpenSSL::SSL::OP_ALL | OpenSSL::SSL::OP_NO_TLSv1_1 }
@@ -854,7 +850,7 @@ def test_forbid_tls_v1_1_for_client
       ctx.ssl_version = :TLSv1_1
       assert_handshake_error { server_connect(port, ctx) }
     }
-  end if defined?(OpenSSL::SSL::OP_NO_TLSv1_1)
+  end
 
   def test_forbid_tls_v1_1_from_server
     start_server_version(:TLSv1_1) { |server, port|
@@ -862,7 +858,7 @@ def test_forbid_tls_v1_1_from_server
       ctx.options = OpenSSL::SSL::OP_ALL | OpenSSL::SSL::OP_NO_TLSv1_1
       assert_handshake_error { server_connect(port, ctx) }
     }
-  end if defined?(OpenSSL::SSL::OP_NO_TLSv1_1)
+  end
 
   def test_forbid_tls_v1_2_for_client
     ctx_proc = Proc.new { |ctx| ctx.options = OpenSSL::SSL::OP_ALL | OpenSSL::SSL::OP_NO_TLSv1_2 }
@@ -871,7 +867,7 @@ def test_forbid_tls_v1_2_for_client
       ctx.ssl_version = :TLSv1_2
       assert_handshake_error { server_connect(port, ctx) }
     }
-  end if defined?(OpenSSL::SSL::OP_NO_TLSv1_2)
+  end
 
   def test_forbid_tls_v1_2_from_server
     start_server_version(:TLSv1_2) { |server, port|
@@ -879,7 +875,7 @@ def test_forbid_tls_v1_2_from_server
       ctx.options = OpenSSL::SSL::OP_ALL | OpenSSL::SSL::OP_NO_TLSv1_2
       assert_handshake_error { server_connect(port, ctx) }
     }
-  end if defined?(OpenSSL::SSL::OP_NO_TLSv1_2)
+  end
 
 end
 
@@ -942,8 +938,7 @@ def test_alpn_protocol_selection_cancel
   end
 end
 
-if OpenSSL::OPENSSL_VERSION_NUMBER > 0x10001000 &&
-	OpenSSL::SSL::SSLContext.method_defined?(:npn_select_cb)
+if OpenSSL::SSL::SSLContext.method_defined?(:npn_select_cb)
   # NPN may be disabled by OpenSSL configure option
 
   def test_npn_protocol_selection_ary
@@ -1296,5 +1291,3 @@ def assert_handshake_error
     }
   end
 end
-
-end
diff --git a/test/test_ssl_session.rb b/test/test_ssl_session.rb
index b2643edd8..2f633b035 100644
--- a/test/test_ssl_session.rb
+++ b/test/test_ssl_session.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestSSLSession < OpenSSL::SSLTestCase
   def test_session_equals
     session = OpenSSL::SSL::Session.new <<-SESSION
@@ -150,7 +148,7 @@ def test_session_timeout
 
   def test_session_exts_read
     assert(OpenSSL::SSL::Session.new(DUMMY_SESSION))
-  end if OpenSSL::OPENSSL_VERSION_NUMBER >= 0x009080bf
+  end
 
   def test_client_session
     last_session = nil
@@ -376,5 +374,3 @@ def test_dup
     assert_equal(sess_orig.to_der, sess_dup.to_der)
   end
 end
-
-end
diff --git a/test/test_x509attr.rb b/test/test_x509attr.rb
index d7473f1a2..249c15936 100644
--- a/test/test_x509attr.rb
+++ b/test/test_x509attr.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509Attribute < OpenSSL::TestCase
   def test_new
     ef = OpenSSL::X509::ExtensionFactory.new
@@ -63,5 +61,3 @@ def test_dup
     assert_equal(attr.to_der, attr.dup.to_der)
   end
 end
-
-end
diff --git a/test/test_x509cert.rb b/test/test_x509cert.rb
index 0cfe4402e..0f317c380 100644
--- a/test/test_x509cert.rb
+++ b/test/test_x509cert.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509Certificate < OpenSSL::TestCase
   def setup
     super
@@ -34,13 +32,10 @@ def test_public_key
       ["authorityKeyIdentifier","keyid:always",false],
     ]
 
-    sha1 = OpenSSL::Digest::SHA1.new
-    dsa_digest = OpenSSL::TestUtils::DSA_SIGNATURE_DIGEST.new
-
     [
-      [@rsa1024, sha1], [@rsa2048, sha1], [@dsa256, dsa_digest], [@dsa512, dsa_digest]
-    ].each{|pk, digest|
-      cert = issue_cert(@ca, pk, 1, exts, nil, nil, digest: digest)
+      @rsa1024, @rsa2048, @dsa256, @dsa512,
+    ].each{|pk|
+      cert = issue_cert(@ca, pk, 1, exts, nil, nil)
       assert_equal(cert.extensions.sort_by(&:to_s)[2].value,
                    OpenSSL::TestUtils.get_subject_key_id(cert))
       cert = OpenSSL::X509::Certificate.new(cert.to_der)
@@ -152,26 +147,15 @@ def test_sign_and_verify_dsa_md5
     }
   end
 
-  def test_dsig_algorithm_mismatch
-    assert_raise(OpenSSL::X509::CertificateError) do
-      issue_cert(@ca, @rsa2048, 1, [], nil, nil, digest: OpenSSL::Digest::DSS1.new)
-    end if OpenSSL::OPENSSL_VERSION_NUMBER < 0x10001000 # [ruby-core:42949]
-  end
-
   def test_dsa_with_sha2
-    begin
-      cert = issue_cert(@ca, @dsa256, 1, [], nil, nil, digest: "sha256")
-      assert_equal("dsa_with_SHA256", cert.signature_algorithm)
-    rescue OpenSSL::X509::CertificateError
-      # dsa_with_sha2 not supported. skip following test.
-      return
-    end
+    cert = issue_cert(@ca, @dsa256, 1, [], nil, nil, digest: "sha256")
+    assert_equal("dsa_with_SHA256", cert.signature_algorithm)
     # TODO: need more tests for dsa + sha2
 
     # SHA1 is allowed from OpenSSL 1.0.0 (0.9.8 requires DSS1)
     cert = issue_cert(@ca, @dsa256, 1, [], nil, nil, digest: "sha1")
     assert_equal("dsaWithSHA1", cert.signature_algorithm)
-  end if defined?(OpenSSL::Digest::SHA256)
+  end
 
   def test_check_private_key
     cert = issue_cert(@ca, @rsa2048, 1, [], nil, nil)
@@ -186,5 +170,3 @@ def certificate_error_returns_false
     false
   end
 end
-
-end
diff --git a/test/test_x509crl.rb b/test/test_x509crl.rb
index 44dfffc95..9c1cdbbf3 100644
--- a/test/test_x509crl.rb
+++ b/test/test_x509crl.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509CRL < OpenSSL::TestCase
   def setup
     super
@@ -196,7 +194,7 @@ def test_sign_and_verify
 
     cert = issue_cert(@ca, @dsa512, 1, [], nil, nil)
     crl = issue_crl([], 1, Time.now, Time.now+1600, [],
-                    cert, @dsa512, OpenSSL::TestUtils::DSA_SIGNATURE_DIGEST.new)
+                    cert, @dsa512, OpenSSL::Digest::SHA1.new)
     assert_equal(false, crl_error_returns_false { crl.verify(@rsa1024) })
     assert_equal(false, crl_error_returns_false { crl.verify(@rsa2048) })
     assert_equal(false, crl.verify(@dsa256))
@@ -213,5 +211,3 @@ def crl_error_returns_false
     false
   end
 end
-
-end
diff --git a/test/test_x509ext.rb b/test/test_x509ext.rb
index 58f03168b..d9cde1bd4 100644
--- a/test/test_x509ext.rb
+++ b/test/test_x509ext.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509Extension < OpenSSL::TestCase
   def setup
     super
@@ -76,5 +74,3 @@ def test_dup
     assert_equal(ext.to_der, ext.dup.to_der)
   end
 end
-
-end
diff --git a/test/test_x509name.rb b/test/test_x509name.rb
index b30a02e64..486d0bbb1 100644
--- a/test/test_x509name.rb
+++ b/test/test_x509name.rb
@@ -2,8 +2,6 @@
 # frozen_string_literal: false
 require_relative 'utils'
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509Name < OpenSSL::TestCase
   def setup
     super
@@ -306,7 +304,6 @@ def test_add_entry
   end
 
   def test_add_entry_street
-    return if OpenSSL::OPENSSL_VERSION_NUMBER < 0x009080df # 0.9.8m
     # openssl/crypto/objects/obj_mac.h 1.83
     dn = [
       ["DC", "org"],
@@ -362,5 +359,3 @@ def test_dup
     assert_equal(name.to_der, name.dup.to_der)
   end
 end
-
-end
diff --git a/test/test_x509req.rb b/test/test_x509req.rb
index 585dda1bc..a42a4f9a2 100644
--- a/test/test_x509req.rb
+++ b/test/test_x509req.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509Request < OpenSSL::TestCase
   def setup
     super
@@ -28,7 +26,7 @@ def test_public_key
     req = OpenSSL::X509::Request.new(req.to_der)
     assert_equal(@rsa1024.public_key.to_der, req.public_key.to_der)
 
-    req = issue_csr(0, @dn, @dsa512, OpenSSL::TestUtils::DSA_SIGNATURE_DIGEST.new)
+    req = issue_csr(0, @dn, @dsa512, OpenSSL::Digest::SHA1.new)
     assert_equal(@dsa512.public_key.to_der, req.public_key.to_der)
     req = OpenSSL::X509::Request.new(req.to_der)
     assert_equal(@dsa512.public_key.to_der, req.public_key.to_der)
@@ -122,7 +120,7 @@ def test_sign_and_verify_rsa_md5
   end
 
   def test_sign_and_verify_dsa
-    req = issue_csr(0, @dn, @dsa512, OpenSSL::TestUtils::DSA_SIGNATURE_DIGEST.new)
+    req = issue_csr(0, @dn, @dsa512, OpenSSL::Digest::SHA1.new)
     assert_equal(false, request_error_returns_false { req.verify(@rsa1024) })
     assert_equal(false, request_error_returns_false { req.verify(@rsa2048) })
     assert_equal(false, req.verify(@dsa256))
@@ -131,18 +129,6 @@ def test_sign_and_verify_dsa
     assert_equal(false, req.verify(@dsa512))
   end
 
-  def test_sign_and_verify_rsa_dss1
-    req = issue_csr(0, @dn, @rsa1024, OpenSSL::Digest::DSS1.new)
-    assert_equal(true,  req.verify(@rsa1024))
-    assert_equal(false, req.verify(@rsa2048))
-    assert_equal(false, request_error_returns_false { req.verify(@dsa256) })
-    assert_equal(false, request_error_returns_false { req.verify(@dsa512) })
-    req.version = 1
-    assert_equal(false, req.verify(@rsa1024))
-  rescue OpenSSL::X509::RequestError
-    pend
-  end if defined?(OpenSSL::Digest::DSS1)
-
   def test_sign_and_verify_dsa_md5
     assert_raise(OpenSSL::X509::RequestError){
       issue_csr(0, @dn, @dsa512, OpenSSL::Digest::MD5.new) }
@@ -161,5 +147,3 @@ def request_error_returns_false
     false
   end
 end
-
-end
diff --git a/test/test_x509store.rb b/test/test_x509store.rb
index af0d8b283..db5e41a00 100644
--- a/test/test_x509store.rb
+++ b/test/test_x509store.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: false
 require_relative "utils"
 
-if defined?(OpenSSL::TestUtils)
-
 class OpenSSL::TestX509Store < OpenSSL::TestCase
   def setup
     super
@@ -209,17 +207,9 @@ def test_set_errors
     crl2 = issue_crl(revoke_info, 2, now+1800, now+3600, [],
                      ca1_cert, @rsa2048, OpenSSL::Digest::SHA1.new)
     store.add_crl(crl1)
-    if /0\.9\.8.*-rhel/ =~ OpenSSL::OPENSSL_VERSION
-      # RedHat is distributing a patched version of OpenSSL that allows
-      # multiple CRL for a key (multi-crl.patch)
-      assert_nothing_raised do
-        store.add_crl(crl2) # add CRL issued by same CA twice.
-      end
-    else
-      assert_raise(OpenSSL::X509::StoreError){
-        store.add_crl(crl2) # add CRL issued by same CA twice.
-      }
-    end
+    assert_raise(OpenSSL::X509::StoreError){
+      store.add_crl(crl2) # add CRL issued by same CA twice.
+    }
   end
 
   def test_dup
@@ -229,5 +219,3 @@ def test_dup
     assert_raise(NoMethodError) { ctx.dup }
   end
 end
-
-end
diff --git a/test/utils.rb b/test/utils.rb
index bbc9c7efc..1b58f3b3e 100644
--- a/test/utils.rb
+++ b/test/utils.rb
@@ -124,14 +124,10 @@ module OpenSSL::TestUtils
   TEST_KEY_DH1024.set_key(OpenSSL::BN.new("556AF1598AE69899867CEBA9F29CE4862B884C2B43C9019EA0231908F6EFA785E3C462A6ECB16DF676866E997FFB72B487DC7967C58C3CA38CE974473BF19B2AA5DCBF102735572EBA6F353F6F0BBE7FF1DE1B07FE1381A355C275C33405004317F9491B5955F191F6615A63B30E55A027FB88A1A4B25608E09EEE68A7DF32D", 16),
                           OpenSSL::BN.new("48561834C67E65FFD2A9B47F41E5E78FDC95C387428FDB1E4B0188B64D1643C3A8D3455B945B7E8C4D166010C7C2CE23BFB9BEF43D0348FE7FA5284B0225E7FE1537546D114E3D8A4411B9B9351AB451E1A358F50ED61B1F00DA29336EEBBD649980AC86D76AF8BBB065298C2052672EEF3EF13AB47A15275FC2836F3AC74CEA", 16))
 
-  DSA_SIGNATURE_DIGEST = OpenSSL::OPENSSL_VERSION_NUMBER > 0x10000000 ?
-                         OpenSSL::Digest::SHA1 :
-                         OpenSSL::Digest::DSS1
-
   module_function
 
   def issue_cert(dn, key, serial, extensions, issuer, issuer_key,
-                 not_before: nil, not_after: nil, digest: nil)
+                 not_before: nil, not_after: nil, digest: "sha256")
     cert = OpenSSL::X509::Certificate.new
     issuer = cert unless issuer
     issuer_key = key unless issuer_key
@@ -149,7 +145,6 @@ def issue_cert(dn, key, serial, extensions, issuer, issuer_key,
     extensions.each{|oid, value, critical|
       cert.add_extension(ef.create_extension(oid, value, critical))
     }
-    digest ||= OpenSSL::PKey::DSA === issuer_key ? DSA_SIGNATURE_DIGEST.new : "sha256"
     cert.sign(issuer_key, digest)
     cert
   end
@@ -375,6 +370,4 @@ def dup_public(key)
       end
     end
   end
-
-end if defined?(OpenSSL::OPENSSL_LIBRARY_VERSION) and
-  /\AOpenSSL +0\./ !~ OpenSSL::OPENSSL_LIBRARY_VERSION
+end