Method: OpenSSL::ASN1.traverse

Defined in:

ossl_asn1.c

.OpenSSL::ASN1.traverse(asn1) ⇒ nil

If a block is given, it prints out each of the elements encountered. Block parameters are (in that order):

• depth: The recursion depth, plus one with each constructed value being encountered (Integer)

• offset: Current byte offset (Integer)

• header length: Combined length in bytes of the Tag and Length headers. (Integer)

• length: The overall remaining length of the entire data (Integer)

• constructed: Whether this value is constructed or not (Boolean)

• tag_class: Current tag class (Symbol)

• tag: The current tag number (Integer)

Example

der = File.binread('asn1data.der')
OpenSSL::ASN1.traverse(der) do | depth, offset, header_len, length, constructed, tag_class, tag|
  puts "Depth: #{depth} Offset: #{offset} Length: #{length}"
  puts "Header length: #{header_len} Tag: #{tag} Tag class: #{tag_class} Constructed: #{constructed}"
end

Returns:

• (nil)

# File 'ossl_asn1.c', line 929

static VALUE
ossl_asn1_traverse(VALUE self, VALUE obj)
{
    unsigned char *p;
    VALUE tmp;
    long len, read = 0, offset = 0;

    obj = ossl_to_der_if_possible(obj);
    tmp = rb_str_new4(StringValue(obj));
    p = (unsigned char *)RSTRING_PTR(tmp);
    len = RSTRING_LEN(tmp);
    ossl_asn1_decode0(&p, len, &offset, 0, 1, &read);
    RB_GC_GUARD(tmp);
    int_ossl_decode_sanity_check(len, read, offset);
    return Qnil;
}