Messaging Layer Security (MLS)
2023-04-06
2025-11-17
MLS Cipher Suites
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
0x0000
RESERVED
-
0x0001
MLS_128_DHKEMX25519_AES128GCM_SHA256_Ed25519
Y
0x0002
MLS_128_DHKEMP256_AES128GCM_SHA256_P256
Y
0x0003
MLS_128_DHKEMX25519_CHACHA20POLY1305_SHA256_Ed25519
Y
0x0004
MLS_256_DHKEMX448_AES256GCM_SHA512_Ed448
Y
0x0005
MLS_256_DHKEMP521_AES256GCM_SHA512_P521
Y
0x0006
MLS_256_DHKEMX448_CHACHA20POLY1305_SHA512_Ed448
Y
0x0007
MLS_256_DHKEMP384_AES256GCM_SHA384_P384
Y
0x0A0A
GREASE
Y
0x1A1A
GREASE
Y
0x2A2A
GREASE
Y
0x3A3A
GREASE
Y
0x4A4A
GREASE
Y
0x5A5A
GREASE
Y
0x6A6A
GREASE
Y
0x7A7A
GREASE
Y
0x8A8A
GREASE
Y
0x9A9A
GREASE
Y
0xAAAA
GREASE
Y
0xBABA
GREASE
Y
0xCACA
GREASE
Y
0xDADA
GREASE
Y
0xEAEA
GREASE
Y
0xF000-0xFFFF
Reserved for Private Use
-
MLS Wire Formats
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
0x0000
RESERVED
-
0x0001
mls_public_message
Y
0x0002
mls_private_message
Y
0x0003
mls_welcome
Y
0x0004
mls_group_info
Y
0x0005
mls_key_package
Y
0x0006-0xEFFF
Unassigned
0xF000-0xFFFF
Reserved for Private Use
-
MLS Extension Types
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
0x0000
RESERVED
N/A
-
0x0001
application_id
LN
Y
0x0002
ratchet_tree
GI
Y
0x0003
required_capabilities
GC
Y
0x0004
external_pub
GI
Y
0x0005
external_senders
GC
Y
0x0A0A
GREASE
KP, GI, LN
Y
0x1A1A
GREASE
KP, GI, LN
Y
0x2A2A
GREASE
KP, GI, LN
Y
0x3A3A
GREASE
KP, GI, LN
Y
0x4A4A
GREASE
KP, GI, LN
Y
0x5A5A
GREASE
KP, GI, LN
Y
0x6A6A
GREASE
KP, GI, LN
Y
0x7A7A
GREASE
KP, GI, LN
Y
0x8A8A
GREASE
KP, GI, LN
Y
0x9A9A
GREASE
KP, GI, LN
Y
0xAAAA
GREASE
KP, GI, LN
Y
0xBABA
GREASE
KP, GI, LN
Y
0xCACA
GREASE
KP, GI, LN
Y
0xDADA
GREASE
KP, GI, LN
Y
0xEAEA
GREASE
KP, GI, LN
Y
0xF000-0xFFFF
Reserved for Private Use
N/A
-
MLS Proposal Types
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
0x0000
RESERVED
-
-
-
0x0001
add
Y
Y
N
0x0002
update
Y
N
Y
0x0003
remove
Y
Y
Y
0x0004
psk
Y
Y
N
0x0005
reinit
Y
Y
N
0x0006
external_init
Y
N
Y
0x0007
group_context_extensions
Y
Y
Y
0x0A0A
GREASE
Y
-
-
0x1A1A
GREASE
Y
-
-
0x2A2A
GREASE
Y
-
-
0x3A3A
GREASE
Y
-
-
0x4A4A
GREASE
Y
-
-
0x5A5A
GREASE
Y
-
-
0x6A6A
GREASE
Y
-
-
0x7A7A
GREASE
Y
-
-
0x8A8A
GREASE
Y
-
-
0x9A9A
GREASE
Y
-
-
0xAAAA
GREASE
Y
-
-
0xBABA
GREASE
Y
-
-
0xCACA
GREASE
Y
-
-
0xDADA
GREASE
Y
-
-
0xEAEA
GREASE
Y
-
-
0xF000-0xFFFF
Reserved for Private Use
-
-
-
MLS Credential Types
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
0x0000
RESERVED
-
0x0001
basic
Y
0x0002
x509
Y
0x0A0A
GREASE
Y
0x1A1A
GREASE
Y
0x2A2A
GREASE
Y
0x3A3A
GREASE
Y
0x4A4A
GREASE
Y
0x5A5A
GREASE
Y
0x6A6A
GREASE
Y
0x7A7A
GREASE
Y
0x8A8A
GREASE
Y
0x9A9A
GREASE
Y
0xAAAA
GREASE
Y
0xBABA
GREASE
Y
0xCACA
GREASE
Y
0xDADA
GREASE
Y
0xEAEA
GREASE
Y
0xF000-0xFFFF
Reserved for Private Use
-
MLS Signature Labels
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
"FramedContentTBS"
Y
"LeafNodeTBS"
Y
"KeyPackageTBS"
Y
"GroupInfoTBS"
Y
MLS Public Key Encryption Labels
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
"UpdatePathNode"
Y
"Welcome"
Y
MLS Exporter Labels
Specification Required
Sean Turner, Raphael Robert, Richard Barnes
Registration requests should be sent to the mailing list described in
RFC9420, Section 17.9. If approved, designated experts should notify
IANA within three weeks. For assistance, please contact iana@iana.org.
SFrame 1.0 Base Key
N
RFC9605, Section 5.2