static VALUE ossl_ssl_session_initialize(VALUE self, VALUE arg1)
{
        SSL_SESSION *ctx = NULL;

        if (RDATA(self)->data)
                ossl_raise(eSSLSession, "SSL Session already initialized");

        if (rb_obj_is_instance_of(arg1, cSSLSocket)) {
                SSL *ssl;

                GetSSL(arg1, ssl);

                if ((ctx = SSL_get1_session(ssl)) == NULL)
                        ossl_raise(eSSLSession, "no session available");
        } else {
                BIO *in = ossl_obj2bio(&arg1);

                ctx = PEM_read_bio_SSL_SESSION(in, NULL, NULL, NULL);

                if (!ctx) {
                        OSSL_BIO_reset(in);
                        ctx = d2i_SSL_SESSION_bio(in, NULL);
                }

                BIO_free(in);

                if (!ctx)
                        ossl_raise(rb_eArgError, "unknown type");
        }

        /* should not happen */
        if (ctx == NULL)
                ossl_raise(eSSLSession, "ctx not set - internal error");

        RDATA(self)->data = ctx;

        return self;
}

static VALUE ossl_ssl_session_eq(VALUE val1, VALUE val2)
{
        SSL_SESSION *ctx1, *ctx2;

        GetSSLSession(val1, ctx1);
        GetSSLSession(val2, ctx2);

        switch (ossl_SSL_SESSION_cmp(ctx1, ctx2)) {
        case 0:                return Qtrue;
        default:       return Qfalse;
        }
}

static VALUE ossl_ssl_session_get_id(VALUE self)
{
        SSL_SESSION *ctx;
        const unsigned char *p = NULL;
        unsigned int i = 0;

        GetSSLSession(self, ctx);

        p = SSL_SESSION_get_id(ctx, &i);

        return rb_str_new((const char *) p, i);
}

static VALUE
ossl_ssl_session_initialize_copy(VALUE self, VALUE other)
{
    SSL_SESSION *sess, *sess_other, *sess_new;

    rb_check_frozen(self);
    sess = RTYPEDDATA_DATA(self); /* XXX */
    GetSSLSession(other, sess_other);

    sess_new = ASN1_dup((i2d_of_void *)i2d_SSL_SESSION, (d2i_of_void *)d2i_SSL_SESSION,
                        (char *)sess_other);
    if (!sess_new)
        ossl_raise(eSSLSession, "ASN1_dup");

    RTYPEDDATA_DATA(self) = sess_new;
    SSL_SESSION_free(sess);

    return self;
}

static VALUE
ossl_ssl_session_get_time(VALUE self)
{
    SSL_SESSION *ctx;
    long t;

    GetSSLSession(self, ctx);
    t = SSL_SESSION_get_time(ctx);
    if (t == 0)
        return Qnil;

    return rb_funcall(rb_cTime, rb_intern("at"), 1, LONG2NUM(t));
}

static VALUE ossl_ssl_session_set_time(VALUE self, VALUE time_v)
{
        SSL_SESSION *ctx;
        long t;

        GetSSLSession(self, ctx);
        if (rb_obj_is_instance_of(time_v, rb_cTime)) {
                time_v = rb_funcall(time_v, rb_intern("to_i"), 0);
        }
        t = NUM2LONG(time_v);
        SSL_SESSION_set_time(ctx, t);
        return ossl_ssl_session_get_time(self);
}

static VALUE
ossl_ssl_session_get_timeout(VALUE self)
{
    SSL_SESSION *ctx;
    long t;

    GetSSLSession(self, ctx);
    t = SSL_SESSION_get_timeout(ctx);

    return LONG2NUM(t);
}

static VALUE ossl_ssl_session_set_timeout(VALUE self, VALUE time_v)
{
        SSL_SESSION *ctx;
        long t;

        GetSSLSession(self, ctx);
        t = NUM2LONG(time_v);
        SSL_SESSION_set_timeout(ctx, t);
        return ossl_ssl_session_get_timeout(self);
}

static VALUE ossl_ssl_session_to_der(VALUE self)
{
        SSL_SESSION *ctx;
        unsigned char *p;
        int len;
        VALUE str;

        GetSSLSession(self, ctx);
        len = i2d_SSL_SESSION(ctx, NULL);
        if (len <= 0) {
                ossl_raise(eSSLSession, "i2d_SSL_SESSION");
        }

        str = rb_str_new(0, len);
        p = (unsigned char *)RSTRING_PTR(str);
        i2d_SSL_SESSION(ctx, &p);
        ossl_str_adjust(str, p);
        return str;
}

static VALUE ossl_ssl_session_to_pem(VALUE self)
{
        SSL_SESSION *ctx;
        BIO *out;

        GetSSLSession(self, ctx);

        if (!(out = BIO_new(BIO_s_mem()))) {
                ossl_raise(eSSLSession, "BIO_s_mem()");
        }

        if (!PEM_write_bio_SSL_SESSION(out, ctx)) {
                BIO_free(out);
                ossl_raise(eSSLSession, "SSL_SESSION_print()");
        }


        return ossl_membio2str(out);
}

static VALUE ossl_ssl_session_to_text(VALUE self)
{
        SSL_SESSION *ctx;
        BIO *out;

        GetSSLSession(self, ctx);

        if (!(out = BIO_new(BIO_s_mem()))) {
                ossl_raise(eSSLSession, "BIO_s_mem()");
        }

        if (!SSL_SESSION_print(out, ctx)) {
                BIO_free(out);
                ossl_raise(eSSLSession, "SSL_SESSION_print()");
        }

        return ossl_membio2str(out);
}