CBOR Object Signing and Encryption (COSE)

Created
2017-01-11
Last Updated
2018-04-19
Available Formats

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Registries included below

COSE Header Parameters

Expert(s)
Francesca Palombini, Matt Miller, Justin Richer, Carsten Bormann
Reference
[RFC8152]
Available Formats

CSV
Range Registration Procedures
Integer values in the range -1 to -65536 delegated to the COSE Header Algorithm Parameters registry
Integer values between 1 and 255 Standards Action With Expert Review
Integer values from 256 to 65535 Specification Required
Integer values greater than 65535 Expert Review
Strings of length 1 Standards Action With Expert Review
Strings of length 2 Specification Required
Strings of length greater than 2 Expert Review
Name Label Value Type Value Registry Description Reference
Reserved for Private Use less than -65536 [RFC8152]
delegated to the COSE Header Algorithm Parameters registry -65536 to -1
Reserved 0 [RFC8152]
alg 1 int / tstr COSE Algorithms registry Cryptographic algorithm to use [RFC8152]
crit 2 [+ label] COSE Header Parameters registry Critical headers to be understood [RFC8152]
content type 3 tstr / uint [COAP Content-Formats] or [Media Types] registry Content type of the payload [RFC8152]
kid 4 bstr Key identifier [RFC8152]
IV 5 bstr Full Initialization Vector [RFC8152]
Partial IV 6 bstr Partial Initialization Vector [RFC8152]
counter signature 7 COSE_Signature / [+ COSE_Signature ] CBOR-encoded signature structure [RFC8152]
Unassigned 8
CounterSignature0 9 bstr Counter signature with implied signer and headers [RFC8152]

COSE Header Algorithm Parameters

Registration Procedure(s)
Expert Review
Expert(s)
Jim Schaad, Göran Selander, Derek Atkins, Sean Turner
Reference
[RFC8152]
Available Formats

CSV
Name Algorithm Label Type Description Reference
Unassigned -65536 to -27
PartyV other direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -26 bstr Party V other provided information [RFC8152]
PartyV nonce direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -25 bstr / int Party V provided nonce [RFC8152]
PartyV identity direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -24 bstr Party V identity information [RFC8152]
PartyU other direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -23 bstr Party U other provided information [RFC8152]
PartyU nonce direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -22 bstr / int Party U provided nonce [RFC8152]
PartyU identity direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -21 bstr Party U identity information [RFC8152]
salt direct+HKDF-SHA-256, direct+HKDF-SHA-512, direct+HKDF-AES-128, direct+HKDF-AES-256, ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -20 bstr Random salt [RFC8152]
Unassigned -19 to -4
static key id ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -3 bstr Static public key identifier for the sender [RFC8152]
static key ECDH-SS+HKDF-256, ECDH-SS+HKDF-512, ECDH-SS+A128KW, ECDH-SS+A192KW, ECDH-SS+A256KW -2 COSE_Key Static public key for the sender [RFC8152]
ephemeral key ECDH-ES+HKDF-256, ECDH-ES+HKDF-512, ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW -1 COSE_Key Ephemeral public key for the sender [RFC8152]

COSE Algorithms

Expert(s)
Jim Schaad, Göran Selander, Derek Atkins, Sean Turner
Reference
[RFC8152]
Available Formats

CSV
Range Registration Procedures
Integer values from -65536 to -257 Specification Required
Integer values between -256 and 255 Standards Action With Expert Review
Integer values from 256 to 65535 Specification Required
Integer values greater than 65535 Expert Review
Strings of length 1 Standards Action With Expert Review
Strings of length 2 Specification Required
Strings of length greater than 2 Expert Review
Name Value Description Reference Recommended
Reserved for Private Use less than -65536 [RFC8152] No
Unassigned -65536
RS1 (TEMPORARY - registered 2018-04-19, expires 2019-04-19) -65535 RSASSA-PKCS1-v1_5 w/ SHA-1 [draft-jones-webauthn-cose-algorithms] Deprecated
Unassigned -65534 to -260
RS512 (TEMPORARY - registered 2018-04-19, expires 2019-04-19) -259 RSASSA-PKCS1-v1_5 w/ SHA-512 [draft-jones-webauthn-cose-algorithms] No
RS384 (TEMPORARY - registered 2018-04-19, expires 2019-04-19) -258 RSASSA-PKCS1-v1_5 w/ SHA-384 [draft-jones-webauthn-cose-algorithms] No
RS256 (TEMPORARY - registered 2018-04-19, expires 2019-04-19) -257 RSASSA-PKCS1-v1_5 w/ SHA-256 [draft-jones-webauthn-cose-algorithms] No
Unassigned -256 to -43
RSAES-OAEP w/ SHA-512 -42 RSAES-OAEP w/ SHA-512 [RFC8230] Yes
RSAES-OAEP w/ SHA-256 -41 RSAES-OAEP w/ SHA-256 [RFC8230] Yes
RSAES-OAEP w/ RFC 8017 default parameters -40 RSAES-OAEP w/ SHA-1 [RFC8230] Yes
PS512 -39 RSASSA-PSS w/ SHA-512 [RFC8230] Yes
PS384 -38 RSASSA-PSS w/ SHA-384 [RFC8230] Yes
PS256 -37 RSASSA-PSS w/ SHA-256 [RFC8230] Yes
ES512 -36 ECDSA w/ SHA-512 [RFC8152] Yes
ES384 -35 ECDSA w/ SHA-384 [RFC8152] Yes
ECDH-SS + A256KW -34 ECDH SS w/ Concat KDF and AES Key Wrap w/ 256-bit key [RFC8152] Yes
ECDH-SS + A192KW -33 ECDH SS w/ Concat KDF and AES Key Wrap w/ 192-bit key [RFC8152] Yes
ECDH-SS + A128KW -32 ECDH SS w/ Concat KDF and AES Key Wrap w/ 128-bit key [RFC8152] Yes
ECDH-ES + A256KW -31 ECDH ES w/ Concat KDF and AES Key Wrap w/ 256-bit key [RFC8152] Yes
ECDH-ES + A192KW -30 ECDH ES w/ Concat KDF and AES Key Wrap w/ 192-bit key [RFC8152] Yes
ECDH-ES + A128KW -29 ECDH ES w/ Concat KDF and AES Key Wrap w/ 128-bit key [RFC8152] Yes
ECDH-SS + HKDF-512 -28 ECDH SS w/ HKDF - generate key directly [RFC8152] Yes
ECDH-SS + HKDF-256 -27 ECDH SS w/ HKDF - generate key directly [RFC8152] Yes
ECDH-ES + HKDF-512 -26 ECDH ES w/ HKDF - generate key directly [RFC8152] Yes
ECDH-ES + HKDF-256 -25 ECDH ES w/ HKDF - generate key directly [RFC8152] Yes
Unassigned -24 to -14
direct+HKDF-AES-256 -13 Shared secret w/ AES-MAC 256-bit key [RFC8152] Yes
direct+HKDF-AES-128 -12 Shared secret w/ AES-MAC 128-bit key [RFC8152] Yes
direct+HKDF-SHA-512 -11 Shared secret w/ HKDF and SHA-512 [RFC8152] Yes
direct+HKDF-SHA-256 -10 Shared secret w/ HKDF and SHA-256 [RFC8152] Yes
Unassigned -9
EdDSA -8 EdDSA [RFC8152] Yes
ES256 -7 ECDSA w/ SHA-256 [RFC8152] Yes
direct -6 Direct use of CEK [RFC8152] Yes
A256KW -5 AES Key Wrap w/ 256-bit key [RFC8152] Yes
A192KW -4 AES Key Wrap w/ 192-bit key [RFC8152] Yes
A128KW -3 AES Key Wrap w/ 128-bit key [RFC8152] Yes
Unassigned -2 to -1
Reserved 0 [RFC8152] No
A128GCM 1 AES-GCM mode w/ 128-bit key, 128-bit tag [RFC8152] Yes
A192GCM 2 AES-GCM mode w/ 192-bit key, 128-bit tag [RFC8152] Yes
A256GCM 3 AES-GCM mode w/ 256-bit key, 128-bit tag [RFC8152] Yes
HMAC 256/64 4 HMAC w/ SHA-256 truncated to 64 bits [RFC8152] Yes
HMAC 256/256 5 HMAC w/ SHA-256 [RFC8152] Yes
HMAC 384/384 6 HMAC w/ SHA-384 [RFC8152] Yes
HMAC 512/512 7 HMAC w/ SHA-512 [RFC8152] Yes
Unassigned 8-9
AES-CCM-16-64-128 10 AES-CCM mode 128-bit key, 64-bit tag, 13-byte nonce [RFC8152] Yes
AES-CCM-16-64-256 11 AES-CCM mode 256-bit key, 64-bit tag, 13-byte nonce [RFC8152] Yes
AES-CCM-64-64-128 12 AES-CCM mode 128-bit key, 64-bit tag, 7-byte nonce [RFC8152] Yes
AES-CCM-64-64-256 13 AES-CCM mode 256-bit key, 64-bit tag, 7-byte nonce [RFC8152] Yes
AES-MAC 128/64 14 AES-MAC 128-bit key, 64-bit tag [RFC8152] Yes
AES-MAC 256/64 15 AES-MAC 256-bit key, 64-bit tag [RFC8152] Yes
Unassigned 16-23
ChaCha20/Poly1305 24 ChaCha20/Poly1305 w/ 256-bit key, 128-bit tag [RFC8152] Yes
AES-MAC 128/128 25 AES-MAC 128-bit key, 128-bit tag [RFC8152] Yes
AES-MAC 256/128 26 AES-MAC 256-bit key, 128-bit tag [RFC8152] Yes
Unassigned 27-29
AES-CCM-16-128-128 30 AES-CCM mode 128-bit key, 128-bit tag, 13-byte nonce [RFC8152] Yes
AES-CCM-16-128-256 31 AES-CCM mode 256-bit key, 128-bit tag, 13-byte nonce [RFC8152] Yes
AES-CCM-64-128-128 32 AES-CCM mode 128-bit key, 128-bit tag, 7-byte nonce [RFC8152] Yes
AES-CCM-64-128-256 33 AES-CCM mode 256-bit key, 128-bit tag, 7-byte nonce [RFC8152] Yes

COSE Key Common Parameters

Expert(s)
Francesca Palombini, Matt Miller, Justin Richer, Carsten Bormann
Reference
[RFC8152]
Available Formats

CSV
Range Registration Procedures
Integer values in the range -65536 to -1 used for key parameters specific to a single algorithm delegated to the COSE Key Type Parameters registry
Integer values between 0 and 255 Standards Action With Expert Review
Integer values from 256 to 65535 Specification Required
Integer values greater than 65535 Expert Review
Strings of length 1 Standards Action With Expert Review
Strings of length 2 Specification Required
Strings of length greater than 2 Expert Review
Name Label CBOR Type Value Registry Description Reference
Reserved for Private Use less than -65536 [RFC8152]
used for key parameters specific to a single algorithm delegated to the COSE Key Type Parameters registry -65536 to -1 [RFC8152]
Reserved 0 [RFC8152]
kty 1 tstr / int COSE Key Common Parameters Identification of the key type [RFC8152]
kid 2 bstr Key identification value - match to kid in message [RFC8152]
alg 3 tstr / int COSE Algorithms Key usage restriction to this algorithm [RFC8152]
key_ops 4 [+ (tstr/int)] Restrict set of permissible operations [RFC8152]
Base IV 5 bstr Base IV to be XORed with Partial IVs [RFC8152]

COSE Key Type Parameters

Registration Procedure(s)
Expert Review
Expert(s)
Jim Schaad, Göran Selander, Derek Atkins, Sean Turner
Reference
[RFC8152]
Available Formats

CSV
Key Type Name Label CBOR Type Description Reference
1 crv -1 int / tstr EC identifier - Taken from the "COSE Elliptic Curves" registry [RFC8152]
2 crv -1 int / tstr EC identifier - Taken from the "COSE Key Common Parameters" registry [RFC8152]
4 k -1 bstr Key Value [RFC8152]
1 x -2 bstr x-coordinate [RFC8152]
2 x -2 bstr x-coordinate [RFC8152]
2 y -3 bstr / bool y-coordinate [RFC8152]
1 d -4 bstr Private key [RFC8152]
2 d -4 bstr Private key [RFC8152]
3 n -1 bstr the RSA modulus n [RFC8230]
3 e -2 bstr the RSA public exponent e [RFC8230]
3 d -3 bstr the RSA private exponent d [RFC8230]
3 p -4 bstr the prime factor p of n [RFC8230]
3 q -5 bstr the prime factor q of n [RFC8230]
3 dP -6 bstr dP is d mod (p - 1) [RFC8230]
3 dQ -7 bstr dQ is d mod (q - 1) [RFC8230]
3 qInv -8 bstr qInv is the CRT coefficient q^(-1) mod p [RFC8230]
3 other -9 array other prime infos, an array [RFC8230]
3 r_i -10 bstr a prime factor r_i of n, where i >= 3 [RFC8230]
3 d_i -11 bstr d_i = d mod (r_i - 1) [RFC8230]
3 t_i -12 bstr the CRT coefficient t_i = (r_1 * r_2 * ... * r_(i-1))^(-1) mod r_i [RFC8230]

COSE Key Types

Registration Procedure(s)
Expert Review
Expert(s)
Jim Schaad, Göran Selander, Derek Atkins, Sean Turner
Reference
[RFC8152]
Available Formats

CSV
Name Value Description Reference
Reserved 0 This value is reserved [RFC8152]
OKP 1 Octet Key Pair [RFC8152]
EC2 2 Elliptic Curve Keys w/ x- and y-coordinate pair [RFC8152]
RSA 3 RSA Key [RFC8230]
Symmetric 4 Symmetric Keys [RFC8152]

COSE Elliptic Curves

Expert(s)
Jim Schaad, Göran Selander, Derek Atkins, Sean Turner
Reference
[RFC8152]
Available Formats

CSV
Range Registration Procedures
Integer values -65536 to -257 Specification Required
Integer values -256 to 255 Standards Action With Expert Review
Integer values 256 to 65535 Specification Required
Integer values greater than 65535 Expert Review
Name Value Key Type Description Reference Recommended
Reserved for Private Use Integer values less than -65536 [RFC8152] No
Unassigned -65536 to -1
Reserved 0 [RFC8152] No
P-256 1 EC2 NIST P-256 also known as secp256r1 [RFC8152] Yes
P-384 2 EC2 NIST P-384 also known as secp384r1 [RFC8152] Yes
P-521 3 EC2 NIST P-521 also known as secp521r1 [RFC8152] Yes
X25519 4 OKP X25519 for use w/ ECDH only [RFC8152] Yes
X448 5 OKP X448 for use w/ ECDH only [RFC8152] Yes
Ed25519 6 OKP Ed25519 for use w/ EdDSA only [RFC8152] Yes
Ed448 7 OKP Ed448 for use w/ EdDSA only [RFC8152] Yes