OSSL_KDF_PARAM_CONSTANT
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_CONSTANT,
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_CONSTANT))
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_CONSTANT, NULL, 0),
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_CONSTANT,