Add BN_bn2binpad API and enable OpenVPN master CI testing

.github/workflows/codespell.yml

@@ -23,7 +23,7 @@ jobs:
         check_filenames: true
         check_hidden: true
           # Add comma separated list of words that occur multiple times that should be ignored (sorted alphabetically, case sensitive)
-        ignore_words_list: adin,aNULL,brunch,carryIn,chainG,ciph,cLen,cliKs,dout,haveA,inCreated,inOut,inout,larg,LEAPYEAR,Merget,optionA,parm,parms,repid,rIn,userA,ser,siz,te,Te,HSI,failT,
+        ignore_words_list: adin,aNULL,brunch,carryIn,chainG,ciph,cLen,cliKs,dout,haveA,inCreated,inOut,inout,larg,LEAPYEAR,Merget,optionA,parm,parms,repid,rIn,userA,ser,siz,te,Te,HSI,failT,toLen,
           # The exclude_file contains lines of code that should be ignored. This is useful for individual lines which have non-words that can safely be ignored.
         exclude_file: '.codespellexcludelines'
           # To skip files entirely from being processed, add it to the following list:

.github/workflows/openvpn.yml

@@ -42,9 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Pinned refs: avoid OpenVPN master until wolfSSL adds any new OpenSSL
-        # APIs it adopts (e.g. BN_bn2binpad). release/2.6 + latest stable tag.
-        ref: [ release/2.6, v2.6.19 ]
+        ref: [ master, release/2.6, v2.6.19 ]
     name: ${{ matrix.ref }}
     if: github.repository_owner == 'wolfssl'
     runs-on: ubuntu-24.04