Function cryptodev_op

freebsd/opencrypto/cryptodev.c:797–1005

}

static int
cryptodev_op(struct csession *cse, const struct crypt_op *cop)
{
	struct cryptop_data *cod = NULL;
	struct cryptop *crp = NULL;
	char *dst;
	int error;

	if (cop->len > 256*1024-4) {
		SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
		return (E2BIG);
	}

	if (cse->txform) {
		if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) {
			SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
			return (EINVAL);
		}
	}

	if (cop->mac && cse->hashsize == 0) {
		SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
		return (EINVAL);
	}

	/*
	 * The COP_F_CIPHER_FIRST flag predates explicit session
	 * modes, but the only way it was used was for EtA so allow it
	 * as long as it is consistent with EtA.
	 */
	if (cop->flags & COP_F_CIPHER_FIRST) {
		if (cop->op != COP_ENCRYPT) {
			SDT_PROBE1(opencrypto, dev, ioctl, error,  __LINE__);
			return (EINVAL);
		}
	}

	cod = cod_alloc(cse, 0, cop->len + cse->hashsize);
	dst = cop->dst;

	crp = crypto_getreq(cse->cses, M_WAITOK);

	error = copyin(cop->src, cod->buf, cop->len);
	if (error) {
		SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
		goto bail;
	}
	crp->crp_payload_start = 0;
	crp->crp_payload_length = cop->len;
	if (cse->hashsize)
		crp->crp_digest_start = cop->len;

	switch (cse->mode) {
	case CSP_MODE_COMPRESS:
		switch (cop->op) {
		case COP_ENCRYPT:
			crp->crp_op = CRYPTO_OP_COMPRESS;
			break;