Use www.rfc-editor.org for RFC text.

We use the following site for that now:

* https://tools.ietf.org/ or http
* https://datatracker.ietf.org or http

Today, IETF said the official site of RFC is www.rfc-editor.org.

FYI: https://authors.ietf.org/en/references-in-rfcxml

I replaced them to www.rfc-editor.org.

ext/openssl/ossl_kdf.c

@@ -18,7 +18,7 @@ static VALUE mKDF, eKDF;
  * of _length_ bytes.
  *
  * For more information about PBKDF2, see RFC 2898 Section 5.2
- * (https://tools.ietf.org/html/rfc2898#section-5.2).
+ * (https://www.rfc-editor.org/rfc/rfc2898#section-5.2).
  *
  * === Parameters
  * pass       :: The password.
@@ -81,10 +81,10 @@ kdf_pbkdf2_hmac(int argc, VALUE *argv, VALUE self)
  * bcrypt.
  *
  * The keyword arguments _N_, _r_ and _p_ can be used to tune scrypt. RFC 7914
- * (published on 2016-08, https://tools.ietf.org/html/rfc7914#section-2) states
+ * (published on 2016-08, https://www.rfc-editor.org/rfc/rfc7914#section-2) states
  * that using values r=8 and p=1 appears to yield good results.
  *
- * See RFC 7914 (https://tools.ietf.org/html/rfc7914) for more information.
+ * See RFC 7914 (https://www.rfc-editor.org/rfc/rfc7914) for more information.
  *
  * === Parameters
  * pass   :: Passphrase.
@@ -147,7 +147,7 @@ kdf_scrypt(int argc, VALUE *argv, VALUE self)
  *    KDF.hkdf(ikm, salt:, info:, length:, hash:) -> String
  *
  * HMAC-based Extract-and-Expand Key Derivation Function (HKDF) as specified in
- * {RFC 5869}[https://tools.ietf.org/html/rfc5869].
+ * {RFC 5869}[https://www.rfc-editor.org/rfc/rfc5869].
  *
  * New in OpenSSL 1.1.0.
  *
@@ -165,7 +165,7 @@ kdf_scrypt(int argc, VALUE *argv, VALUE self)
  *   The hash function.
  *
  * === Example
- *   # The values from https://datatracker.ietf.org/doc/html/rfc5869#appendix-A.1
+ *   # The values from https://www.rfc-editor.org/rfc/rfc5869#appendix-A.1
  *   ikm = ["0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"].pack("H*")
  *   salt = ["000102030405060708090a0b0c"].pack("H*")
  *   info = ["f0f1f2f3f4f5f6f7f8f9"].pack("H*")

ext/openssl/ossl_ns_spki.c

@@ -365,8 +365,8 @@ ossl_spki_verify(VALUE self, VALUE key)
  *
  * OpenSSL::Netscape is a namespace for SPKI (Simple Public Key
  * Infrastructure) which implements Signed Public Key and Challenge.
- * See {RFC 2692}[http://tools.ietf.org/html/rfc2692] and {RFC
- * 2693}[http://tools.ietf.org/html/rfc2692] for details.
+ * See {RFC 2692}[https://www.rfc-editor.org/rfc/rfc2692] and {RFC
+ * 2693}[https://www.rfc-editor.org/rfc/rfc2692] for details.
  */
 
 /* Document-class: OpenSSL::Netscape::SPKIError

test/openssl/test_ssl.rb

@@ -691,7 +691,7 @@ def test_verify_wildcard
     assert_equal(true,  OpenSSL::SSL.verify_wildcard("xn--qdk4b9b", "xn--qdk4b9b"))
   end
 
-  # Comments in this test is excerpted from http://tools.ietf.org/html/rfc6125#page-27
+  # Comments in this test is excerpted from https://www.rfc-editor.org/rfc/rfc6125#page-27
   def test_post_connection_check_wildcard_san
     # case-insensitive ASCII comparison
     # RFC 6125, section 6.4.1