[ruby-core:35124] [Ruby 1.9-Bug#4374] [ext/openssl] ASN1.decode wrong for infinite length values

Issue #4374 has been updated by Martin Bosslet.


I verified that with the current code it's not possible to construct a Constructive 
instance without tagging if the tag_class is passed as an explicit parameter. 
Tagging will be set to :EXPLICIT if it was passed as nil. That's why 

if (infinite && !(tag == V_ASN1_SEQUENCE || tag == V_ASN1_SET)){
                asn1data = rb_funcall(cASN1Constructive,
                                      rb_intern("new"),
                                      4,
                                      value,
                                      INT2NUM(tag),
                                      Qnil,
                                      ID2SYM(tag_class));

in ossl_asn1_decode0 will always produce a Constructive with :EXPLICIT
tagging, and reencoding a parsed ASN.1 value will fail or produce incorrect 
output.
At first I thought changing the defaults in ossl_asn1_initialize would be
more intuitive but not essential to the fix - but now I think it has become
mandatory.
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