IKEV2_XFORMPRF_HMAC_SHA2_256
case IKEV2_XFORMPRF_HMAC_SHA2_256:
{ IKEV2_XFORMTYPE_PRF, IKEV2_XFORMPRF_HMAC_SHA2_256 },
{ "hmac-sha2-256", IKEV2_XFORMPRF_HMAC_SHA2_256, 32 },