static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
{
struct scatterlist tmp;
sg_set_buf(&tmp, key, keylen);
crypto_digest_digest(tfm, &tmp, 1, key);
}
inline void iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
u8* crc)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc);
buf->sg.length += sizeof(uint32_t);
}
static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
{
struct scatterlist tmp;
tmp.page = virt_to_page(key);
tmp.offset = offset_in_page(key);
tmp.length = keylen;
crypto_digest_digest(tfm, &tmp, 1, key);
}
/*
* Key Derivation, from RFC 3078, RFC 3079.
* Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
*/
static void get_new_key_from_sha(struct ppp_mppe_state * state)
{
struct scatterlist sg[4];
setup_sg(&sg[0], state->master_key, state->keylen);
setup_sg(&sg[1], sha_pad->sha_pad1, sizeof(sha_pad->sha_pad1));
setup_sg(&sg[2], state->session_key, state->keylen);
setup_sg(&sg[3], sha_pad->sha_pad2, sizeof(sha_pad->sha_pad2));
crypto_digest_digest (state->sha1, sg, 4, state->sha1_digest);
}
int iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
{
int ahslen;
struct iscsi_hdr *hdr;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
uint32_t cdgst, rdgst = 0;
hdr = tcp_conn->in.hdr;
/* verify PDU length */
tcp_conn->in.datalen = ntoh24(hdr->dlength);
if (tcp_conn->in.datalen > conn->max_recv_dlength) {
printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
tcp_conn->in.datalen, conn->max_recv_dlength);
return ISCSI_ERR_DATALEN;
}
tcp_conn->data_copied = 0;
/* read AHS */
ahslen = hdr->hlength << 2;
tcp_conn->in.offset += ahslen;
tcp_conn->in.copy -= ahslen;
if (tcp_conn->in.copy < 0) {
printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
"%d bytes\n", ahslen);
return ISCSI_ERR_AHSLEN;
}
/* calculate read padding */
tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
if (tcp_conn->in.padding) {
tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
}
if (conn->hdrdgst_en) {
struct scatterlist sg;
sg_init_one(&sg, (u8 *)hdr,
sizeof(struct iscsi_hdr) + ahslen);
crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
ahslen);
if (cdgst != rdgst) {
printk(KERN_ERR "iscsi_tcp: hdrdgst error "
"recv 0x%x calc 0x%x\n", rdgst, cdgst);
return ISCSI_ERR_HDR_DGST;
}
}
return 0;
}
