Function swcr_newsession

freebsd/opencrypto/cryptosoft.c:1308–1409

* Generate a new software session. */

 * Generate a new software session.
 */
static int
swcr_newsession(device_t dev, crypto_session_t cses,
    const struct crypto_session_params *csp)
{
	struct swcr_session *ses;
	struct swcr_encdec *swe;
	struct swcr_auth *swa;
	struct comp_algo *cxf;
	int error;

	ses = crypto_get_driver_session(cses);
	mtx_init(&ses->swcr_lock, "swcr session lock", NULL, MTX_DEF);

	error = 0;
	swe = &ses->swcr_encdec;
	swa = &ses->swcr_auth;
	switch (csp->csp_mode) {
	case CSP_MODE_COMPRESS:
		switch (csp->csp_cipher_alg) {
		case CRYPTO_DEFLATE_COMP:
			cxf = &comp_algo_deflate;
			break;
#ifdef INVARIANTS
		default:
			panic("bad compression algo");
#endif
		}
		ses->swcr_compdec.sw_cxf = cxf;
		ses->swcr_process = swcr_compdec;
		break;
	case CSP_MODE_CIPHER:
		switch (csp->csp_cipher_alg) {
		case CRYPTO_NULL_CBC:
			ses->swcr_process = swcr_null;
			break;
#ifdef INVARIANTS
		case CRYPTO_AES_NIST_GCM_16:
		case CRYPTO_AES_CCM_16:
			panic("bad cipher algo");
#endif
		default:
			error = swcr_setup_cipher(ses, csp);
			if (error == 0)
				ses->swcr_process = swcr_encdec;
		}
		break;
	case CSP_MODE_DIGEST:
		error = swcr_setup_auth(ses, csp);
		break;
	case CSP_MODE_AEAD:
		switch (csp->csp_cipher_alg) {
		case CRYPTO_AES_NIST_GCM_16:
			error = swcr_setup_gcm(ses, csp);
			if (error == 0)
				ses->swcr_process = swcr_gcm;
			break;
		case CRYPTO_AES_CCM_16:
			error = swcr_setup_ccm(ses, csp);