.TH "libnvme" 9 "struct nvmf_auth_kxchap_challenge" "October 2026" "API Manual" LINUX
.SH NAME
struct nvmf_auth_kxchap_challenge \- KX-HMAC-CHAP_Challenge message, controller to host
.SH SYNOPSIS
struct nvmf_auth_kxchap_challenge {
.br
.BI "    __u8 auth_type;"
.br
.BI "    __u8 auth_id;"
.br
.BI "    __u16 rsvd2;"
.br
.BI "    __le16 t_id;"
.br
.BI "    __u8 hl;"
.br
.BI "    __u8 rsvd7;"
.br
.BI "    __u8 hashid;"
.br
.BI "    __u8 kxgid;"
.br
.BI "    __le16 kxvlen;"
.br
.BI "    __le32 seqnum;"
.br
.BI "    __u8 cval_kxv[];"
.br
.BI "
};
.br

.SH Members
.IP "auth_type" 12
Authentication Type, see \fIenum nvmf_auth_protocol_id\fP
.IP "auth_id" 12
Authentication Identifier, see \fIenum nvmf_auth_kxchap_id\fP
.IP "rsvd2" 12
Reserved
.IP "t_id" 12
Transaction Identifier
.IP "hl" 12
Hash Length: length in bytes of the selected hash function
.IP "rsvd7" 12
Reserved
.IP "hashid" 12
Hash Identifier, see \fIenum libnvmf_hmac_alg\fP
.IP "kxgid" 12
Key Exchange Group Identifier, see \fIenum nvmf_auth_kxgid\fP.
Cleared to 0h if no key exchange is performed.
.IP "kxvlen" 12
KX Value Length: length in bytes of the KX Value carried in
\fIcval_kxv\fP, cleared to 0h if \fIkxgid\fP is cleared to 0h.
.IP "seqnum" 12
Sequence Number (S1)
.IP "cval_kxv" 12
Challenge Value (C1, \fIhl\fP bytes) followed by the KX Value
(KXc, \fIkxvlen\fP bytes). The KX Value is absent if \fIkxvlen\fP is
cleared to 0h.