emulate_buf_init
rv = emulate_buf_init(session_p, EDIGEST_LENGTH, OP_DIGEST);
if ((rv = emulate_buf_init(session_p, EDIGEST_LENGTH, opflag)) !=
CK_RV emulate_buf_init(kernel_session_t *session_p, int buflen, int opflag);
rv = emulate_buf_init(session_p, indata_len, OP_DIGEST);