bcrypt issue

bcrypt_ext.c

/* Actually line: 39 */
/* Given a secret and a salt, generates a salted hash (which you can then store safely).
*/
static VALUE bc_crypt(VALUE self, VALUE key, VALUE setting) {
    char * value;
    void * data;
    int size;
    VALUE out;

    data = NULL;
    size = 0xDEADBEEF;

    if(NIL_P(key) || NIL_P(setting)) return Qnil;
    
    rb_warn("StringValuePtr(key): %s", StringValuePtr(key));
    VALUE key_str = rb_string_value(&key);
    rb_warn("key - rb_string_value(&key) = %d", (int)(key - key_str));
    rb_warn("StringValuePtr(rb_string_value(&key)): %s", StringValuePtr(key_str));
    char * key_str_ptr = RSTRING_PTR(key_str);
    rb_warn("StringValuePtr(RSTRING_PTR(rb_string_value(&key))): %s", StringValuePtr(key));
    rb_warn("RSTRING_PTR(rb_string_value(&key)): %s", key_str_ptr);

    value = crypt_ra(
	    NIL_P(key) ? NULL : StringValuePtr(key),
	    NIL_P(setting) ? NULL : StringValuePtr(setting),
	    &data,
	    &size);

    if(!value) return Qnil;

    out = rb_str_new(data, size - 1);

    xfree(data);

    return out;
}

engine.rb

    # Actually line: 43
    # Given a secret and a valid salt (see BCrypt::Engine.generate_salt) calculates
    # a bcrypt() password hash.
    def self.hash_secret(secret, salt, _ = nil)
      if valid_secret?(secret)
        if valid_salt?(salt)
          if RUBY_PLATFORM == "java"
            Java.bcrypt_jruby.BCrypt.hashpw(secret.to_s, salt.to_s)
          else
            puts secret
            ret2 = __bc_crypt("Ozlo!Nix6", "$2a$10$Tr3Lz.9gIfl93YGNUMA/.u")
            ret1 = __bc_crypt(secret.to_s, salt)
            return ret1
          end
        else
          raise Errors::InvalidSalt.new("invalid salt")
        end
      else
        raise Errors::InvalidSecret.new("invalid secret")
      end
    end

output

Ozlo!Nix6
/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:52: warning: StringValuePtr(key): Ozlo!Nix6
/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:52: warning: key - rb_string_value(&key) = 0
/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:52: warning: StringValuePtr(rb_string_value(&key)): Ozlo!Nix6
/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:52: warning: StringValuePtr(RSTRING_PTR(rb_string_value(&key))): Ozlo!Nix6
/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:52: warning: RSTRING_PTR(rb_string_value(&key)): Ozlo!Nix6

/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:53: warning: StringValuePtr(key): Ozlo!Nix6 \234	

/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:53: warning: key - rb_string_value(&key) = 0
/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:53: warning: StringValuePtr(rb_string_value(&key)): Ozlo!Nix6 \234	

/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:53: warning: StringValuePtr(RSTRING_PTR(rb_string_value(&key))): Ozlo!Nix6 \234	

/Users/charles/.gem/ruby/2.2.0/gems/bcrypt-3.1.10/lib/bcrypt/engine.rb:53: warning: RSTRING_PTR(rb_string_value(&key)): Ozlo!Nix6 \234