| Internet-Draft | json-proof-algorithms | April 2025 |
| Jones, et al. | Expires 9 October 2025 | [Page] |
The JSON Proof Algorithms (JPA) specification registers cryptographic algorithms and identifiers to be used with the JSON Web Proof, JSON Web Key (JWK), and COSE specifications. It defines IANA registries for these identifiers.¶
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This Internet-Draft will expire on 9 October 2025.¶
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The JSON Web Proof (JWP) [I-D.ietf-jose-json-web-proof] draft establishes a new secure container format that supports selective disclosure and unlinkability using Zero-Knowledge Proofs (ZKPs) or other cryptographic algorithms.¶
Editor's Note: This draft is still early and incomplete. There will be significant changes to the algorithms as currently defined here. Please do not use any of these definitions or examples for anything except personal experimentation and learning. Contributions and feedback are welcomed at https://github.com/ietf-wg-jose/json-web-proof.¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
The roles of "issuer", "holder", and "verifier" are used as defined by the VC Data Model [VC-DATA-MODEL-2.0]. The term "presentation" is also used as defined by this source, but the term "credential" is avoided in this specification to minimize confusion with other definitions.¶
The terms "JSON Web Signature (JWS)", "Base64url Encoding", "Header Parameter", "JOSE Header", "JWS Payload", "JWS Signature", and "JWS Protected Header" are defined by [RFC7515].¶
The terms "JSON Web Proof (JWP)", "JWP Payload", "JWP Proof", and "JWP Protected Header" are defined by [I-D.ietf-jose-json-web-proof].¶
These terms are defined by this specification:¶
JWP defines a container binding together a protected header, one or more payloads, and a cryptographic proof. It does not define any details about the interactions between an application and the cryptographic libraries that implement proof-supporting algorithms.¶
Due to the nature of ZKPs, this specification also documents the subtle but important differences in proof algorithms versus those defined by the JSON Web Algorithms [RFC7518]. These differences help support more advanced capabilities such as blinded signatures and predicate proofs.¶
The four principal interactions that every proof algorithm MUST support are [issue](#issue), [confirm](#confirm), [present](#present), and [verify](#verify).¶
The JWP is first created as the output of a JPA's issue operation.¶
Every algorithm MUST support a JSON issuer protected header along with one or more octet string payloads. The algorithm MAY support using additional items provided by the holder for issuance such as blinded payloads, keys for replay prevention, etc.¶
All algorithms MUST provide integrity protection for the issuer header and all payloads and MUST specify all digest and/or hash2curve methods used.¶
Performed by the holder to validate that the issued JWP is correctly formed and protected.¶
Each algorithm MAY support using additional input items options, such as those sent to the issuer for issuance. After confirmation, an algorithm MAY return a modified JWP for serialized storage without the local state (such as with blinded payloads now unblinded).¶
The algorithm MUST fully verify the issued proof value against the issuer protected header and all payloads. If given a presented JWP instead of an issued one, the confirm process MUST return an error.¶
Used to apply any selective disclosure choices and perform any unlinkability transformations, as well as to show binding.¶
An algorithm MAY support additional input options from the requesting party, such as for predicate proofs and verifiable computation requests.¶
Every algorithm MUST support the ability to hide any or all payloads. It MUST always include the issuer protected header unmodified in the presentation.¶
The algorithm MUST replace the issued proof value and generate a new presented proof value. It also MUST include a new presentation protected header that provides replay protection.¶
Performed by the verifier to verify the protected headers along with any disclosed payloads and/or assertions about them from the proving party, while also verifying they are the same payloads and ordering as witnessed by the issuer.¶
The algorithm MUST verify the integrity of all disclosed payloads and MUST also verify the integrity of both the issuer and presentation protected headers.¶
If the presented proof contains any assertions about the hidden payloads, the algorithm MUST also verify all of those assertions. It MAY support additional options, such as those sent to the holder to generate the presentation.¶
If given an issued JWP for verification, the algorithm MUST return an error.¶
This section defines how to use specific algorithms for JWPs.¶
The Single Use (SU) algorithm is based on composing multiple traditional asymmetric signatures into a single JWP proof. It enables a very simple form of selective disclosure without requiring any advanced cryptographic techniques.¶
It does not support unlinkability if the same JWP is presented multiple times, therefore when privacy is required the holder will need to interact with the issuer again to receive new single-use JWPs (dynamically or in batches).¶
The Single Use algorithm is based on using multiple signatures to cover the individual payloads, all of which are generated with the same Asymmetric JSON Web Algorithm (JWA). The internal signing algorithm to use is part of the registration for a new Single Use algorithm identifier.¶
The chosen JWA MUST be an asymmetric signing algorithm so that each signature can be verified without sharing any private values between the parties. This ensures that the verifier cannot brute force any non-disclosed payloads based only on their disclosed individual signatures.¶
In order to support the protection of a presentation by a holder to a verifier, the holder MUST use a Presentation Key during the issuance and the presentation of every Single Use JWP. This Presentation Key MUST be generated and used for only one JWP.¶
The issuer MUST verify that the holder has possession of this key. The holder-issuer communication to exchange this information is out of scope of this specification, but can be accomplished by the holder using this key to generate a JWS that signs a value the issuer can verify as unique.¶
To create a Single Use JWP, the issuer first generates a unique Ephemeral Key using the selected internal algorithm. This key-pair will be used to sign each of the payloads of a single JWP and then discarded.¶
Each individual payload is signed using the selected internal algorithm using the Ephemeral Key.¶
The issuer's Ephemeral Key MUST be included in the issuer protected header via the Proof Key header parameter.¶
The holder's Presentation Key MUST be included in issuer protected header via the Presentation Key header parameter.¶
The issuer protected header is signed using the given JWA and the issuer's Stable Key.¶
Each JWP payload is processed in order and signed using the given JWA using the issuer's Ephemeral Key.¶
The proof value is an octet string array. The first entry is the octet string of the issuer protected header signature, with an additional entry for each payload signature.¶
To generate a new presentation, the holder first creates a presentation protected header that is specific to the verifier being presented to. This header MUST contain a parameter that both the holder and verifier trust as being unique and non-replayable.
Use of the nonce header parameter is RECOMMENDED for this purpose.¶
This specification registers the nonce header parameter for the presentation protected header that contains a string value either generated by the verifier or derived from values provided by the verifier. When present, the verifier MUST ensure the nonce value matches during verification.¶
The presentation protected header MAY contain other header parameters that are either provided by the verifier or by the holder. These presentation header parameters SHOULD NOT contain values that are common across multiple presentations and SHOULD be unique to a single presentation and verifier.¶
Editor's Note: The current definition here is incomplete, the holder's signature needs to also incorporate the presented proof.¶
The holder derives a new proof as part of presentation. The presented proof value will always contain the issuer's Stable Key signature for the issuer protected header as the first element.¶
The second element of the presented proof is the holder's signature of the presentation protected header using the holder's presentation key. This signature is constructed using the same algorithm described in generating the issuer's signature over the issuer protected header. Signing only the presentation header with the Presentation Key is sufficient to protect the entire presentation since that key is private to the holder and only the contents of the presentation header are used for replay prevention.¶
For each payload which is to be disclosed, the corresponding payload signature (from the issued JWP) is included in the proof. If a payload is omitted from the presented JWP, the signature value will NOT be includeed, and the presentation proof will have one less part.¶
For example, if the second and fifth of five payloads are not disclosed, then the holder's derived proof would consist of the issuer's signature over the issuer protected header, the holder's signature over the holder's protected header, the ephemeral key signature over the first, third and fourth payloads.¶
Since the individual signatures in the proof value are unique and remain unchanged across multiple presentations, a Single Use JWP SHOULD only be presented a single time to each verifier in order for the holder to remain unlinkable across multiple presentations.¶
The verifier MUST verify the issuer protected header octets against the first part in the proof using the issuer's Stable Key. It MUST also verify the presentation protected header octets against the second part in the proof value using the holder's Presentation Key, as provided in the Presentation Key header parameter.¶
With the headers verified, the Proof Key header parameter can then be used to verify each of the disclosed payload signatures.¶
The proposed JWP alg value is of the format "SU-" appended with the relevant JWS alg value for the chosen public and ephemeral key-pair algorithm, for example "SU-ES256".¶
The BBS Signature Scheme [I-D.irtf-cfrg-bbs-signatures] is under active development within the CRFG.¶
This algorithm supports both selective disclosure and unlinkability, enabling the holder to generate multiple presentations from one issued JWP without a verifier being able to correlate those presentations together based on the proof.¶
The BBS algorithm corresponds to a ciphersuite identifier of BBS_BLS12381G1_XMD:SHA-256_SSWU_RO_.¶
The key used for the BBS algorithm is an elliptic curve-based key pair, specifically against the G_2 subgroup of a pairing friendly curve. Additional details on key generation can be found in Section 3.4. The JWK and Cose Key Object representations of the key are detailed in [I-D.ietf-cose-bls-key-representations].¶
There is no additional holder presentation key necessary for presentation proofs.¶
Issuance is performed using the Sign operation from Section 3.5.1 of [I-D.irtf-cfrg-bbs-signatures]. This operation utilizes the issuer's BLS12-381 G2 key pair as SK and PK, along with desired protected header and payloads as the octets header and the octets array messages.¶
The octets resulting from this operation form a single octet string in the issuance proof array, to be used along with the protected header and payloads to serialize the JWP.¶
Holder verification of the signature on issuance form is performed using the Verify operation from Section 3.5.2 of [I-D.irtf-cfrg-bbs-signatures].¶
This operation utilizes the issuer's public key as PK, the proof as signature, the protected header octets as header and the array of payload octets as messages.¶
Derivation of a presentation is done by the holder using the ProofGen operation from Section 3.5.3 of [I-D.irtf-cfrg-bbs-signatures].¶
This operation utilizes the issuer's public key as PK, the issuer protected header as header, the issuance proof as signature, the issuance payloads as messages, and the holder's presentation protected header as ph.¶
The operation also takes a vector of indexes into messages, describing which payloads the holder wishes to disclose. All payloads are required for proof generation, but only these indicated payloads will be required to be disclosed for later proof verification.¶
The output of this operation is the presentation proof, as a single octet string.¶
Presentation serialization leverages the two protected headers and presentation proof, along with the disclosed payloads. Non-disclosed payloads are represented with the absent value of null in JSON serialization and a zero-length string in compact serialization.¶
Verification of a presentation is done by the verifier using the ProofVerify operation from Section 3.5.4.¶
This operation utilizes the issuer's public key as PK, the issuer protected header as header, the issuance proof as signature, the holder's presentation protected header as ph, and the payloads as disclosed_messages.¶
In addition, the disclosed_indexes scalar array is calculated from the payloads provided. Values disclosed in the presented payloads have a zero-based index in this array, while the indices of absent payloads are omitted.¶
The Message Authentication Code (MAC) JPA uses a MAC to both generate ephemeral keys and compute authentication codes to protect the issuer header and each payload individually.¶
Like the the Single Use algorithm family, it also does not support unlinkability if the same JWP is presented multiple times. and requires an individually issued JWP for each presentation in order to fully protect privacy. When compared to the JWS approach, using a MAC requires less computation but can result in potentially larger presentation proof values.¶
The design is intentionally minimal and only involves using a single standardized MAC method instead of a mix of MAC/hash methods or a custom hash-based construct. It is able to use any published cryptographic MAC method such as HMAC [RFC2104] or KMAC. It uses traditional public-key based signatures to verify the authenticity of the issuer and holder.¶
Prior to the issuer creating a new JWP, the issuer MUST have a presentation public key provided by the holder.¶
The holder's presentation key MUST be included in the issuer's protected header using the Presentation Key header parameter.¶
To use the MAC algorithm, the issuer must have a stable public key pair to perform signing. To start the issuance process, a single 32-byte random Shared Secret must first be generated. This value will be shared privately to the holder as part of the issuer's JWP proof value.¶
The Shared Secret is used by both the issuer and holder as the MAC method's key to generate a new set of unique ephemeral keys. These keys are then used as the input to generate a MAC that protects each payload.¶
The combined MAC representation is a single octet string representing the MAC values of the issuer protected header, along with each payload provided by the issuer. This representation is signed by the issuer, but not shared - parties will recreate this octet string and verify the signature to verify the integrity of supplied issuer protected header and the integrity of any disclosed payloads.¶
The issuer protected header is included in this value as a MAC created using the fixed key "issuer_header" in UTF-8 encoded octets. The value is the issuer header JSON as a UTF-8 encoded octet string.¶
A unique key is generated for each payload using a MAC, with the Shared Secret as the key and a value of "payload_X" as UTF-8 encoded octets, where "X" is replaced by the zero-based array index of the payload, for example "payload_0", "payload_1", etc.¶
Each payload then itself has a corresponding MAC, using the above per-payload key and the payload octet string.¶
The combined MAC representation is the octet string formed by the the concatentation of the issuer protected header MAC output, along with each payload MAC output.¶
The issuer proof consists of two octet strings.¶
The first octet string is the issuer signature over the combined MAC representation. The issuer signs the JWS using its stable public key, and a fixed header containing the alg associated with signing algorithm in use.¶
jws_header = '{"alg":"ES256"}'¶
The signature value of the JWS is extracted and base64url-decoded into an octet string.¶
The second octet string is the Shared Secret used to generate the per-payload keys for the combined representation.¶
See the JWS Presentation Protected Header section.¶
Editor's Note: The current definition here is incomplete, the holder's signature needs to also incorporate the presented proof.¶
The first value in the presentation proof is the presentation signature. This is a signature over the presentation protected header, using the key specified by the Presentation Key header parameter in the issuer protected header.¶
The second value is the issuer signature over the Combined MAC Representation provided with the issued form.¶
The remaining values are used by the verifier to reconstruct the combined MAC representation without access to the Shared Secret. There is one value corresponding to each payload, whether it has been disclosed or not.¶
If a payload is disclosed, the unique per-payload key derived from the shared secret is used as the payload's entry in the proof array.¶
If a payload is not disclosed, the payload's MAC in the combined MAC representation is used as the payload's entry in the proof array.¶
The verifier must recreate the Combined MAC Representation from the presentation proof to verify integrity over the disclosed information.¶
The issuer protected header MAC is recreated using the same mechanism described above.¶
For each payload in the presentation:¶
If the payload is disclosed, then the presentation proof contains the unique per-payload key. The corresponding payload MAC can be computed by performing the MAC operation with this key and the corresponding payload.¶
If the payload is not disclosed, then the presentation proof contains the payload MAC, which can be used directly¶
The concatenation of the octets of the issuer protected header MAC and each payload MAC forms the Combined MAC Representation. The issuer signature in the proof is then verified by converting these values to a JWS as described above, and verifying that JWS.¶
Proposed JWP alg value is of the format "MAC-" appended with a unique identifier for the set of MAC and signing algorithms used. Below are the initial registrations:¶
MAC-H256 uses HMAC SHA-256 as the MAC and ECDSA using P-256 and SHA-256 for the signatures¶
MAC-H384 uses HMAC SHA-384 as the MAC and ECDSA using P-384 and SHA-384 for the signatures¶
MAC-H512 uses HMAC SHA-512 as the MAC and ECDSA using P-521 and SHA-512 for the signatures¶
MAC-K25519 uses KMAC SHAKE128 as the MAC and EdDSA using Curve25519 for the signatures¶
MAC-K448 uses KMAC SHAKE256 as the MAC and EdDSA using Curve448 for the signatures¶
MAC-H256K uses HMAC SHA-256 as the MAC and ECDSA using secp256k1 and SHA-256 for the signatures¶
Editor's Note: This will follow once the algorithms defined here have become more stable.¶
The following registration procedure is used for all the registries established by this specification.¶
Values are registered on a Specification Required [RFC5226] basis after a three-week review period on the jose-reg-review@ietf.org mailing list, on the advice of one or more Designated Experts. However, to allow for the allocation of values prior to publication, the Designated Experts may approve registration once they are satisfied that such a specification will be published.¶
Registration requests sent to the mailing list for review should use an appropriate subject (e.g., "Request to register JWP algorithm: example").¶
Within the review period, the Designated Experts will either approve or deny the registration request, communicating this decision to the review list and IANA. Denials should include an explanation and, if applicable, suggestions as to how to make the request successful. Registration requests that are undetermined for a period longer than 21 days can be brought to the IESG's attention (using the iesg@ietf.org mailing list) for resolution.¶
Criteria that should be applied by the Designated Experts include determining whether the proposed registration duplicates existing functionality, whether it is likely to be of general applicability or useful only for a single application, and whether the registration description is clear.¶
IANA must only accept registry updates from the Designated Experts and should direct all requests for registration to the review mailing list.¶
It is suggested that multiple Designated Experts be appointed who are able to represent the perspectives of different applications using this specification, in order to enable broadly informed review of registration decisions. In cases where a registration decision could be perceived as creating a conflict of interest for a particular Expert, that Expert should defer to the judgment of the other Experts.¶
This specification establishes the
IANA "JSON Web Proof Algorithms" registry
for values of the JWP alg (algorithm) parameter in JWP Header Parameters.
The registry records the algorithm name, the algorithm description,
the algorithm usage locations,
the implementation requirements, the change controller,
and a reference to the specification that defines it.
The same algorithm name can be registered multiple times,
provided that the sets of usage locations are disjoint.¶
It is suggested that the length of the key be included in the algorithm name when multiple variations of algorithms are being registered that use keys of different lengths and the key lengths for each need to be fixed (for instance, because they will be created by key derivation functions). This allows readers of the JSON text to more easily make security decisions.¶
The Designated Experts should perform reasonable due diligence that algorithms being registered either are currently considered cryptographically credible or are being registered as Deprecated or Prohibited.¶
The implementation requirements of an algorithm may be changed over time as the cryptographic landscape evolves, for instance, to change the status of an algorithm to Deprecated or to change the status of an algorithm from Optional to Recommended+ or Required. Changes of implementation requirements are only permitted on a Specification Required basis after review by the Designated Experts, with the new specification defining the revised implementation requirements level.¶
Single-Use JWP using ES256.)
Descriptive names may not match other registered names unless the
Designated Experts state that there is a compelling reason to
allow an exception.¶
SU-ES256). This label is a
case-sensitive ASCII string. JSON Labels may not match other
registered labels in a case-insensitive manner unless the
Designated Experts state that there is a compelling reason to
allow an exception.¶
1). CBOR Labels may not match
other registered labels unless the Designated Experts state that
there is a compelling reason to allow an exception.¶
Issued or Presented. Other values may be used with the
approval of a Designated Expert.¶
Required, Recommended, Optional, Deprecated,
or Prohibited.
Optionally, the word can be followed by a + or -. The use of
+ indicates that the requirement strength is likely to be
increased in a future version of the specification. The use of
- indicates that the requirement strength is likely to be
decreased in a future version of the specification.
Any identifiers registered for algorithms that are otherwise
unsuitable for direct use as JWP algorithms must be registered as
Prohibited.¶
SU-ES256¶
SU-ES384¶
SU-ES512¶
BBS¶
BBS_BLS12381G1_XMD:SHA-256_SSWU_RO_H2G_HM2S_¶
MAC-H256¶
MAC-H256 uses HMAC SHA-256 as the MAC,
and ECDSA using P-256 and SHA-256 for the signatures¶
MAC-H384¶
MAC-H384 uses HMAC SHA-384 as the MAC,
and ECDSA using P-384 and SHA-384 for the signatures¶
MAC-H512¶
MAC-H512 uses HMAC SHA-512 as the MAC,
and ECDSA using P-521 and SHA-512 for the signatures¶
MAC-K25519¶
MAC-K25519 uses KMAC SHAKE128 as the
MAC, and EdDSA using Curve25519 for the signatures¶
MAC-K448¶
MAC-K448 uses KMAC SHAKE256 as the MAC,
and EdDSA using Curve448 for the signatures¶
MAC-H256K¶
MAC-H256K uses HMAC SHA-256 as the MAC,
and ECDSA using secp256k1 and SHA-256 for the signatures¶
The following examples use algorithms defined in JSON Proof Algorithms and also contain the keys used, so that implementations can validate these samples.¶
This example uses the Single-Use Algorithm as defined in JSON Proof Algorithms to create a JSON Proof Token. It demonstrates how to apply selective disclosure using an array of traditional JWS-based signatures. Unlinkability is only achieved by using each JWP one time, as multiple uses are inherently linkable via the traditional ECDSA signature embedded in the proof.¶
To begin, we need two asymmetric keys for Single Use: one that represents the JPT Issuer's stable key and the other is an ephemeral key generated by the Issuer just for this JWP.¶
This is the Issuer's stable private key used in this example in the JWK format:¶
{
"kty": "EC",
"crv": "P-256",
"x": "k5RKy5wN-ywqh3iobcRD4u4N8QIBkMr4fmT0OSfTz0w",
"y": "iCy6DgL4KjCDmSkttS3P-sSoB8LsmQR-_slXCwAaagc",
"d": "5Wlvei1bXAN9fc91oxemDjItKdN5PlUSOjbxWfZ28iU"
}
This is the ephemeral private key used in this example in the JWK format:¶
{
"kty": "EC",
"crv": "P-256",
"x": "u-UZE9LdwVt7f1jmR15uIkUTRfwFtWp3pJHTcSBBRM8",
"y": "8zhSMqAYDxLmUYYtdN6nQHdidjOMyG4vPlBc5kXai7c",
"d": "aD86Y9HK5yCYaVxYQkEwr4DNRob5RIxusELRJ3i1-lY"
}
This is the Holder's presentation private key used in this example in the JWK format:¶
{
"kty": "EC",
"crv": "P-256",
"x": "hmjxiD8CRXXsaUYEM_A_0NFch8dW1raWWwJUu4n_acE",
"y": "PkDIm4IvHZ3xhIlyIobE_1js31Vfm5ROhu6T9LfXavw",
"d": "MVMzPQ1n7UOJrBobfCfnZHbISydiY5HGwtQKNmeh9d0"
}
The JWP Protected Header declares that the data structure is a JPT and the JWP Proof Input is secured using the Single-Use ECDSA algorithm with the P-256 curve and SHA-256 digest. It also includes the ephemeral public key, the Holder's presentation public key and list of claims used for this JPT.¶
{
"alg": "SU-ES256",
"typ": "JPT",
"iss": "https://issuer.example",
"claims": [
"iat",
"exp",
"family_name",
"given_name",
"email",
"address",
"age_over_21"
],
"proof_key": {
"kty": "EC",
"crv": "P-256",
"x": "u-UZE9LdwVt7f1jmR15uIkUTRfwFtWp3pJHTcSBBRM8",
"y": "8zhSMqAYDxLmUYYtdN6nQHdidjOMyG4vPlBc5kXai7c"
},
"presentation_key": {
"kty": "EC",
"crv": "P-256",
"x": "hmjxiD8CRXXsaUYEM_A_0NFch8dW1raWWwJUu4n_acE",
"y": "PkDIm4IvHZ3xhIlyIobE_1js31Vfm5ROhu6T9LfXavw"
}
}
eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8vaXNzdWVyL mV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hbWUiLCJnaXZlbl 9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicHJvb2Zfa2V5Ijp 7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNTYiLCJ4IjoidS1VWkU5TGR3VnQ3ZjFqbVIxNXVJ a1VUUmZ3RnRXcDNwSkhUY1NCQlJNOCIsInkiOiI4emhTTXFBWUR4TG1VWVl0ZE42blFIZ Glkak9NeUc0dlBsQmM1a1hhaTdjIn0sInByZXNlbnRhdGlvbl9rZXkiOnsia3R5IjoiRU MiLCJjcnYiOiJQLTI1NiIsIngiOiJobWp4aUQ4Q1JYWHNhVVlFTV9BXzBORmNoOGRXMXJ hV1d3SlV1NG5fYWNFIiwieSI6IlBrREltNEl2SFozeGhJbHlJb2JFXzFqczMxVmZtNVJP aHU2VDlMZlhhdncifX0
The Single Use algorithm utilizes multiple individual JWS Signatures. Each signature value is generated by creating a JWS with a single Protected Header with the associated alg value. In this example, the fixed header used for each JWS is the serialized JSON Object {"alg":"ES256"}. This protected header will be used to generate a signature over each corresponding payload in the JWP. The corresponding octet value in the proof is the octet string (base64url-decoded) value of the signature.¶
The final proof value from the Issuer is an array with the octets of the header signature, followed by entries for each payload signature.¶
[
1714521600,
1717199999,
"Doe",
"Jay",
"jaydoe@example.org",
{
"formatted": "1234 Main St.\nAnytown, CA 12345\nUSA",
"street_address": "1234 Main St.",
"locality": "Anytown",
"region": "CA",
"postal_code": 12345,
"country": "USA"
},
true
]
The resulting JSON serialized JPT using the above examples is:¶
{
"issuer": "eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBz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",
"payloads": [
"MTcxNDUyMTYwMA",
"MTcxNzE5OTk5OQ",
"IkRvZSI",
"IkpheSI",
"ImpheWRvZUBleGFtcGxlLm9yZyI",
"eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxu
VVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxpdH
kiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUs
ImNvdW50cnkiOiJVU0EifQ",
"dHJ1ZQ"
],
"proof": [
"OnrCHTCkuI4yd5j7Hie1DQW3NIWFj1KbmocyiES50ZlrazN3XbIfd40yDo5CK_-A
feJwAWKrcOPJ2SiYilromQ",
"ZS5sfbZmw5rmlr2ad7zpI26WqwxFC5o8dgruLwo8HZSUbaVTjOS0Jc2fuJn8lOK8
nNB0Lo1orM9FvDKQ5MK1FA",
"FmOIR9gOirahZ9X3dY_cd870ltdciP6jH6UZfXF-d747Gfc-mkZdBZWXgH0GWw56
t8InLDWRce5oqaeAZlj-xQ",
"r2ypddIE58oRXigi98j5ddWg46kmEopOz53GpDozVgldMs27-tRPZj7sJbR416mb
lh-SWAPDOtAZazOSStVcNA",
"aYKIq4ADp5yoH7YXHXdJOAfuVP2LXDj1d5C51xUy7XvK3adblk-XdfYwwBWOmhEV
FFjyQ2yezivrFPlTUMltXA",
"NNwVSoNtRHj1XZyVzOrPg9tIHoSr3N8jXEbhOs4G0SeBZm93yKjaQMOjWZ5lAJLO
dvP6iTuEQct7z_vrvATI6Q",
"KuYPBomxJLDfFx7xdKboj9_UcOs75Ezcmres1Zn4d_AgaB9NhZeqKap-A-TO5qPO
hrQ6Vge5aofvp4i3V0KOIw",
"OGR7ojrSzICCHUHCXG2tE4pVwaQCeB34JQNYqb6YM4Jdpf4_Zwcn5KicfscX2sx0
vRBZOQa0Hb9t-5O9QehDtA"
]
}
The compact serialization of the same JPT is:¶
eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8vaXNzdWVyL mV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hbWUiLCJnaXZlbl 9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicHJvb2Zfa2V5Ijp 7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNTYiLCJ4IjoidS1VWkU5TGR3VnQ3ZjFqbVIxNXVJ a1VUUmZ3RnRXcDNwSkhUY1NCQlJNOCIsInkiOiI4emhTTXFBWUR4TG1VWVl0ZE42blFIZ Glkak9NeUc0dlBsQmM1a1hhaTdjIn0sInByZXNlbnRhdGlvbl9rZXkiOnsia3R5IjoiRU MiLCJjcnYiOiJQLTI1NiIsIngiOiJobWp4aUQ4Q1JYWHNhVVlFTV9BXzBORmNoOGRXMXJ hV1d3SlV1NG5fYWNFIiwieSI6IlBrREltNEl2SFozeGhJbHlJb2JFXzFqczMxVmZtNVJP aHU2VDlMZlhhdncifX0.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~Imp heWRvZUBleGFtcGxlLm9yZyI~eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0 b3duLCBDQSAxMjM0NVxuVVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuI iwibG9jYWxpdHkiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MT IzNDUsImNvdW50cnkiOiJVU0EifQ~dHJ1ZQ.OnrCHTCkuI4yd5j7Hie1DQW3NIWFj1Kbm ocyiES50ZlrazN3XbIfd40yDo5CK_-AfeJwAWKrcOPJ2SiYilromQ~ZS5sfbZmw5rmlr2 ad7zpI26WqwxFC5o8dgruLwo8HZSUbaVTjOS0Jc2fuJn8lOK8nNB0Lo1orM9FvDKQ5MK1 FA~FmOIR9gOirahZ9X3dY_cd870ltdciP6jH6UZfXF-d747Gfc-mkZdBZWXgH0GWw56t8 InLDWRce5oqaeAZlj-xQ~r2ypddIE58oRXigi98j5ddWg46kmEopOz53GpDozVgldMs27 -tRPZj7sJbR416mblh-SWAPDOtAZazOSStVcNA~aYKIq4ADp5yoH7YXHXdJOAfuVP2LXD j1d5C51xUy7XvK3adblk-XdfYwwBWOmhEVFFjyQ2yezivrFPlTUMltXA~NNwVSoNtRHj1 XZyVzOrPg9tIHoSr3N8jXEbhOs4G0SeBZm93yKjaQMOjWZ5lAJLOdvP6iTuEQct7z_vrv ATI6Q~KuYPBomxJLDfFx7xdKboj9_UcOs75Ezcmres1Zn4d_AgaB9NhZeqKap-A-TO5qP OhrQ6Vge5aofvp4i3V0KOIw~OGR7ojrSzICCHUHCXG2tE4pVwaQCeB34JQNYqb6YM4Jdp f4_Zwcn5KicfscX2sx0vRBZOQa0Hb9t-5O9QehDtA
To present this JPT, we first use the following presentation header with a nonce (provided by the Verifier):¶
{
"alg": "SU-ES256",
"aud": "https://recipient.example.com",
"nonce": "MsWt5u0oUDYCBE6s0B03f4tvLeM2LL-94woA_0_vCpY"
}
eyJhbGciOiJTVS1FUzI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaXBpZW50LmV4YW1wbGUuY 29tIiwibm9uY2UiOiJNc1d0NXUwb1VEWUNCRTZzMEIwM2Y0dHZMZU0yTEwtOTR3b0FfMF 92Q3BZIn0
When signed with the holder's presentation key, the resulting signature are:¶
gfPCtRyAOYO2--kVrf495WDgulADtjU-5X0RzcEePRJYT9NeMcOdtfWkp1ifMCFwvAO-Z xw36iG8_SN1zVnxbA¶
Figure: Holder Proof-of-Possession (SU-ES256 for JSON serializations)¶
Then by applying selective disclosure of only the given name and age claims (family name and email hidden), we get the following presented JPT:¶
{
"presentation": "eyJhbGciOiJTVS1FUzI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaX
BpZW50LmV4YW1wbGUuY29tIiwibm9uY2UiOiJNc1d0NXUwb1VEWUNCRTZzMEIw
M2Y0dHZMZU0yTEwtOTR3b0FfMF92Q3BZIn0",
"issuer": "eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBz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",
"payloads": [
"MTcxNDUyMTYwMA",
"MTcxNzE5OTk5OQ",
"IkRvZSI",
"IkpheSI",
"ImpheWRvZUBleGFtcGxlLm9yZyI",
"eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxu
VVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxpdH
kiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUs
ImNvdW50cnkiOiJVU0EifQ",
"dHJ1ZQ",
null,
null
],
"proof": [
"OnrCHTCkuI4yd5j7Hie1DQW3NIWFj1KbmocyiES50ZlrazN3XbIfd40yDo5CK_-A
feJwAWKrcOPJ2SiYilromQ",
"gfPCtRyAOYO2--kVrf495WDgulADtjU-5X0RzcEePRJYT9NeMcOdtfWkp1ifMCFw
vAO-Zxw36iG8_SN1zVnxbA",
"ZS5sfbZmw5rmlr2ad7zpI26WqwxFC5o8dgruLwo8HZSUbaVTjOS0Jc2fuJn8lOK8
nNB0Lo1orM9FvDKQ5MK1FA",
"FmOIR9gOirahZ9X3dY_cd870ltdciP6jH6UZfXF-d747Gfc-mkZdBZWXgH0GWw56
t8InLDWRce5oqaeAZlj-xQ",
"r2ypddIE58oRXigi98j5ddWg46kmEopOz53GpDozVgldMs27-tRPZj7sJbR416mb
lh-SWAPDOtAZazOSStVcNA",
"aYKIq4ADp5yoH7YXHXdJOAfuVP2LXDj1d5C51xUy7XvK3adblk-XdfYwwBWOmhEV
FFjyQ2yezivrFPlTUMltXA",
"NNwVSoNtRHj1XZyVzOrPg9tIHoSr3N8jXEbhOs4G0SeBZm93yKjaQMOjWZ5lAJLO
dvP6iTuEQct7z_vrvATI6Q"
]
}
¶
Figure: Presentation (SU-ES256, JSON Serialization)¶
And also in compact serialization:¶
eyJhbGciOiJTVS1FUzI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaXBpZW50LmV4YW1wbGUuY 29tIiwibm9uY2UiOiJNc1d0NXUwb1VEWUNCRTZzMEIwM2Y0dHZMZU0yTEwtOTR3b0FfMF 92Q3BZIn0.eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8 vaXNzdWVyLmV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hbWUi LCJnaXZlbl9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicHJvb 2Zfa2V5Ijp7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNTYiLCJ4IjoidS1VWkU5TGR3VnQ3Zj FqbVIxNXVJa1VUUmZ3RnRXcDNwSkhUY1NCQlJNOCIsInkiOiI4emhTTXFBWUR4TG1VWVl 0ZE42blFIZGlkak9NeUc0dlBsQmM1a1hhaTdjIn0sInByZXNlbnRhdGlvbl9rZXkiOnsi a3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOiJobWp4aUQ4Q1JYWHNhVVlFTV9BXzBOR mNoOGRXMXJhV1d3SlV1NG5fYWNFIiwieSI6IlBrREltNEl2SFozeGhJbHlJb2JFXzFqcz MxVmZtNVJPaHU2VDlMZlhhdncifX0.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~I kpheSI~ImpheWRvZUBleGFtcGxlLm9yZyI~eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3 QuXG5Bbnl0b3duLCBDQSAxMjM0NVxuVVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1 haW4gU3QuIiwibG9jYWxpdHkiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxf Y29kZSI6MTIzNDUsImNvdW50cnkiOiJVU0EifQ~dHJ1ZQ~~.OnrCHTCkuI4yd5j7Hie1D QW3NIWFj1KbmocyiES50ZlrazN3XbIfd40yDo5CK_-AfeJwAWKrcOPJ2SiYilromQ~gfP CtRyAOYO2--kVrf495WDgulADtjU-5X0RzcEePRJYT9NeMcOdtfWkp1ifMCFwvAO-Zxw3 6iG8_SN1zVnxbA~ZS5sfbZmw5rmlr2ad7zpI26WqwxFC5o8dgruLwo8HZSUbaVTjOS0Jc 2fuJn8lOK8nNB0Lo1orM9FvDKQ5MK1FA~FmOIR9gOirahZ9X3dY_cd870ltdciP6jH6UZ fXF-d747Gfc-mkZdBZWXgH0GWw56t8InLDWRce5oqaeAZlj-xQ~r2ypddIE58oRXigi98 j5ddWg46kmEopOz53GpDozVgldMs27-tRPZj7sJbR416mblh-SWAPDOtAZazOSStVcNA~ aYKIq4ADp5yoH7YXHXdJOAfuVP2LXDj1d5C51xUy7XvK3adblk-XdfYwwBWOmhEVFFjyQ 2yezivrFPlTUMltXA~NNwVSoNtRHj1XZyVzOrPg9tIHoSr3N8jXEbhOs4G0SeBZm93yKj aQMOjWZ5lAJLOdvP6iTuEQct7z_vrvATI6Q¶
Figure: Presentation (SU-ES256, Compact Serialization)¶
This example is meant to mirror the prior JSON serialization, using RFC8392 and claims from [I-D.maldant-spice-oidc-cwt], illustrated using [I-D.ietf-cbor-edn-literals] (EDN).¶
To simplify this example, the same information is represented as the JPT example above, including the same public and private keys.¶
{ / protected header /
1: 1, / alg: "SU-ES256" /
3: 20, / typ: "JPT" (20CPA) /
5: "https://issuer.example", / iss: "https://issuer.example" /
6: [ / claims /
6, / "iat" /
4, / "exp" /
170, / "family_name" (I-D.maldant-spice-oidc-cwt TBD1) /
171, / "given_name" (I-D.maldant-spice-oidc-cwt TBD2) /
179, / "email" (I-D.maldant-spice-oidc-cwt TBD10) /
187, / "address" (I-D.maldant-spice-oidc-cwt TBD18) /
"age_over_21"
],
8: { / proof key /
1: 2, / kty : "EC2" /
-1: 1, / crv: "P-256" /
-2: h'8668f1883f024575ec69460433f03fd0d15c87c756d6b6965b0254bb' +
h'89ff69c1', / x /
-3: h'3e40c89b822f1d9df18489722286c4ff58ecdf555f9b944e86ee93f4' +
h'b7d76afc' / y /
},
9: { / presentation key /
1: 2, / kty: "EC2" /
-1: 1, / crv: "P-256" /
-2: h'bbe51913d2ddc15b7b7f58e6475e6e22451345fc05b56a77a491d371' +
h'204144cf', / x /
-3: h'f3385232a0180f12e651862d74dea740776276338cc86e2f3e505ce6' +
h'45da8bb7' / y /
}
}
¶
Figure: Issuer Protected Header (SU-ES256, CBOR)¶
[ / payloads /
/ iat / 171452160,
/ exp / 171719999,
/ family_name / "Doe",
/ given_name / "Jay",
/ email / "jaydoe@example.org",
/ address / {
/ formatted / 1: "1234 Main St.\nAnytown, CA 12345\nUSA",
/ street / 2: "1234 Main St.",
/ locality / 3: "Anytown",
/ region / 4: "CA",
/ post code / 5: "90210",
/ country / 6: "USA"
},
/ age_over_21 / true
]
¶
Figure: Issuer Payloads (as CBOR array)¶
When signed and serialized, the CPT is represented by the following CBOR (in hex):¶
8358cda601010314057668747470733a2f2f6973737565722e6578616d706c65 0687060418aa18ab18b318bb6b6167655f6f7665725f323108a4010220012158 208668f1883f024575ec69460433f03fd0d15c87c756d6b6965b0254bb89ff69 c12258203e40c89b822f1d9df18489722286c4ff58ecdf555f9b944e86ee93f4 b7d76afc09a401022001215820bbe51913d2ddc15b7b7f58e6475e6e22451345 fc05b56a77a491d371204144cf225820f3385232a0180f12e651862d74dea740 776276338cc86e2f3e505ce645da8bb7871a0a3827001a0a3c3d3f63446f6563 4a6179726a6179646f65406578616d706c652e6f7267a601782331323334204d 61696e2053742e0a416e79746f776e2c2043412031323334350a555341026d31 323334204d61696e2053742e0367416e79746f776e0462434105653930323130 0663555341f5885840530d62e9de42b5014c7d19271e50cd3edfb06ee9135740 54df334c0876ea3a49a9cf4a286d4ce920abe5ada674f5db42fca9c40e28f8ea a58ea32f787c1ec4685840f2d8affb5bb1896593cc1acd641f9dba309f45ff52 bb5777d77fe3c2c71087071a3e162c24f0376b59d8295e7f5088af81bc45b679 f31e5fe718f4be6e0b2d395840b9ded623bf5f502b31402e203285b61b58e541 d14bbb4d21fcb2f43e411212423cea7145286e3e3db1258418c67e2514e58030 6d1c02532b72be05dc9209bc8558405c6c1efa203b680204caa90126f0391ef6 a78d809635a8bcdc16510b7ac73984baee70b7b23be59fc401772cc1f4bb1bae 26346e1a88ec0d2a6914f848ae71de58404de3086b20ec7209f16096e6990ebd 87f5a7651b977084da07f2e5a1e46203eef2bea5bd3ee7ba23acfbe036e6e96a 203a2a52e055d8e8dc3a4f1c21eb7c1d22584022dd332ee9cd86853885130192 c5f23c40897cdefe2f0e1a9ceed69b69af46cd3e954dc5dfcb370fd6c450b05e 0b11182ffb69ae9add80c9b89dc2047875ebeb5840720da012195f0cc3bbbf69 a162bad366da654e314541752e84b2a5caceb992e842bc16e4db6338d48b9d1c fd8feffaf9a92a590f1dd574a9b54aaff366aa3eca5840ac7cff93836c92f060 268166bffb99605fc34e256b8c1c74279e3b7cf9e5f8bcb492a4103fd21d50a3 fda5a8deba0285e3c8624ff27283da8e8f9cc296fea1db¶
Fixtures: Issued Form (SU-ES256, CBOR)¶
The presented form, similarly to the issued form above, is made with the holder conveying the same parameters and the same set of selectively disclosed payloads as the JPT above:¶
{ / protected header /
1: 1, / alg: "SU-ES256" /
6: "https://recipient.example.com", / aud /
7: h'32c5ade6ed28503602044eacd01d377f8b6f2de3362cbfbde30a00ff4fef0a96', / nonce /
}
¶
Figure: Holder Protected Header (SU-ES256, CBOR)¶
When the appropriate proof is generated, the CPT is serialized into the following CBOR (in hex):¶
845846a3010106781d68747470733a2f2f726563697069656e742e6578616d70 6c652e636f6d07582032c5ade6ed28503602044eacd01d377f8b6f2de3362cbf bde30a00ff4fef0a9658cda601010314057668747470733a2f2f697373756572 2e6578616d706c650687060418aa18ab18b318bb6b6167655f6f7665725f3231 08a4010220012158208668f1883f024575ec69460433f03fd0d15c87c756d6b6 965b0254bb89ff69c12258203e40c89b822f1d9df18489722286c4ff58ecdf55 5f9b944e86ee93f4b7d76afc09a401022001215820bbe51913d2ddc15b7b7f58 e6475e6e22451345fc05b56a77a491d371204144cf225820f3385232a0180f12 e651862d74dea740776276338cc86e2f3e505ce645da8bb7891a0a3827001a0a 3c3d3f63446f65634a6179726a6179646f65406578616d706c652e6f7267a601 782331323334204d61696e2053742e0a416e79746f776e2c2043412031323334 350a555341026d31323334204d61696e2053742e0367416e79746f776e046243 41056539303231300663555341f5f6f6875840530d62e9de42b5014c7d19271e 50cd3edfb06ee913574054df334c0876ea3a49a9cf4a286d4ce920abe5ada674 f5db42fca9c40e28f8eaa58ea32f787c1ec468584046fdb826a658d92e1479d1 b7721d71720294fd08d63979c929b3425882d3520d1fc4931655d25fce43605a 98655c204cc3eed2b9042bb102e51725a74fdb70e15840f2d8affb5bb1896593 cc1acd641f9dba309f45ff52bb5777d77fe3c2c71087071a3e162c24f0376b59 d8295e7f5088af81bc45b679f31e5fe718f4be6e0b2d395840b9ded623bf5f50 2b31402e203285b61b58e541d14bbb4d21fcb2f43e411212423cea7145286e3e 3db1258418c67e2514e580306d1c02532b72be05dc9209bc8558405c6c1efa20 3b680204caa90126f0391ef6a78d809635a8bcdc16510b7ac73984baee70b7b2 3be59fc401772cc1f4bb1bae26346e1a88ec0d2a6914f848ae71de58404de308 6b20ec7209f16096e6990ebd87f5a7651b977084da07f2e5a1e46203eef2bea5 bd3ee7ba23acfbe036e6e96a203a2a52e055d8e8dc3a4f1c21eb7c1d22584022 dd332ee9cd86853885130192c5f23c40897cdefe2f0e1a9ceed69b69af46cd3e 954dc5dfcb370fd6c450b05e0b11182ffb69ae9add80c9b89dc2047875ebeb¶
Figure: Presented Form (SU-ES256, CBOR)¶
The following example uses the BBS algorithm.¶
This is the Issuer's stable private key in the JWK format:¶
{
"kty": "EC2",
"alg": "BBS",
"use": "proof",
"crv": "BLS12381G2",
"x": "F6ya_Of9nbS6wK8Mf4KNYJi0X0YPE9CoKaILEeODnrvgjBq08Tbn7bQr6pM7i
w-PFiljcT6lj5dc0w5Ri3xe7GHd42UxbaqcOT8HpTP7v0yyqZJfII5udv-BRln
HwBHZ",
"y": "Fh2NqXmKPrzVQjbZYDs4gBAlC--KbrwAlZXnsJoW5OHZqK9k9Q02c_-UzpXC0
JWjAV76S4e13pRznw66U-TmitSJPGXXszbIPaGoGs5WbZt8MdkmGH4sQDHQcJE
6OMxi",
"d": "BfU4SMuOvr0_CaELA4n-Ep83Ig05prgos8dk0THXUGA"
}
There is no additional holder key necessary for presentation proofs.¶
For the following protected header and array of payloads:¶
{
"kid": "HjfcpyjuZQ-O8Ye2hQnNbT9RbbnrobptdnExR0DUjU8",
"alg": "BBS"
}
These components are signed using the private issuer key previously given, which is then representable in the following serializations:¶
{
"issuer": "eyJraWQiOiJIamZjcHlqdVpRLU84WWUyaFFuTmJUOVJiYm5yb2JwdGRu
RXhSMERValU4IiwiYWxnIjoiQkJTIn0",
"payloads": [
"MTcxNDUyMTYwMA",
"MTcxNzE5OTk5OQ",
"IkRvZSI",
"IkpheSI",
"ImpheWRvZUBleGFtcGxlLm9yZyI",
"eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxu
VVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxpdH
kiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUs
ImNvdW50cnkiOiJVU0EifQ",
"dHJ1ZQ"
],
"proof": [
"kBxl4U-ibEwjxO2yF5hY4wzjf1xnq6d_NUhmQ33K_YbMphjEItNvT-eODp5l5GY4
NUEpL-_ifCxvd4b_iI7a5kgdEjFTKW6xcVx4O4o2YkU"
]
}
eyJraWQiOiJIamZjcHlqdVpRLU84WWUyaFFuTmJUOVJiYm5yb2JwdGRuRXhSMERValU4I iwiYWxnIjoiQkJTIn0.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~Imph eWRvZUBleGFtcGxlLm9yZyI~eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b 3duLCBDQSAxMjM0NVxuVVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIi wibG9jYWxpdHkiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTI zNDUsImNvdW50cnkiOiJVU0EifQ~dHJ1ZQ.kBxl4U-ibEwjxO2yF5hY4wzjf1xnq6d_NU hmQ33K_YbMphjEItNvT-eODp5l5GY4NUEpL-_ifCxvd4b_iI7a5kgdEjFTKW6xcVx4O4o 2YkU
For a presentation with the following presentation header:¶
{
"alg": "BBS",
"aud": "https://recipient.example.com",
"nonce": "wrmBRkKtXjQ"
}
The holder decides to share all information other than the email address, and generates a proof. That proof is represented in the following serializations:¶
{
"presentation": "eyJhbGciOiJCQlMiLCJhdWQiOiJodHRwczovL3JlY2lwaWVudC
5leGFtcGxlLmNvbSIsIm5vbmNlIjoid3JtQlJrS3RYalEifQ",
"issuer": "eyJraWQiOiJIamZjcHlqdVpRLU84WWUyaFFuTmJUOVJiYm5yb2JwdGRu
RXhSMERValU4IiwiYWxnIjoiQkJTIn0",
"payloads": [
"MTcxNDUyMTYwMA",
"MTcxNzE5OTk5OQ",
"IkRvZSI",
"IkpheSI",
null,
null,
null
],
"proof": [
"ikUWl2I6z5piTOSE71BorBCOTi-KKbuoa-cinn6NZYYBba70RAMxgnDYoK8a49DZ
glARWFfn19kEoBdQkfLpq3ZaDQCyFoKGA0Py7uAmvkypfm5VSW4sJVMThqTi6f
a-j28AcC33tGfp8onz6QIRH_7__ssbpWZ5Tc1ZiZRjq-ELrupj3Pq7iDwHOrSE
uWGpToRiMdeY4GzL_wbiqBflFHF6IKwYtE8uPcVw-VYPDKVVQ8zTFWq8_c4Nz6
tYAbQcljWXgihWa3lSZ6To9gflzRhYycXhSzaEfpA6nCjHHB27s0hEiGTvN9bs
UC1uNo2ubdNtjOjZo6RkqylbXzGOZShbTod_LRoLJG-hgt-BLGRrei4xP_CX1y
Q2sWlNT-77-9MgpeD867vUMbGmzVQE0l3SlivLbOOzZAzP_1Ov0JS2WsArqOpX
BZ_r0CZH6c7pWoq5b52iPLKq3gXMHBqRvWFWLdjlaFawe_LV_397cJ4"
]
}
eyJhbGciOiJCQlMiLCJhdWQiOiJodHRwczovL3JlY2lwaWVudC5leGFtcGxlLmNvbSIsI m5vbmNlIjoid3JtQlJrS3RYalEifQ.eyJraWQiOiJIamZjcHlqdVpRLU84WWUyaFFuTmJ UOVJiYm5yb2JwdGRuRXhSMERValU4IiwiYWxnIjoiQkJTIn0.MTcxNDUyMTYwMA~MTcxN zE5OTk5OQ~IkRvZSI~IkpheSI~~~.ikUWl2I6z5piTOSE71BorBCOTi-KKbuoa-cinn6N ZYYBba70RAMxgnDYoK8a49DZglARWFfn19kEoBdQkfLpq3ZaDQCyFoKGA0Py7uAmvkypf m5VSW4sJVMThqTi6fa-j28AcC33tGfp8onz6QIRH_7__ssbpWZ5Tc1ZiZRjq-ELrupj3P q7iDwHOrSEuWGpToRiMdeY4GzL_wbiqBflFHF6IKwYtE8uPcVw-VYPDKVVQ8zTFWq8_c4 Nz6tYAbQcljWXgihWa3lSZ6To9gflzRhYycXhSzaEfpA6nCjHHB27s0hEiGTvN9bsUC1u No2ubdNtjOjZo6RkqylbXzGOZShbTod_LRoLJG-hgt-BLGRrei4xP_CX1yQ2sWlNT-77- 9MgpeD867vUMbGmzVQE0l3SlivLbOOzZAzP_1Ov0JS2WsArqOpXBZ_r0CZH6c7pWoq5b5 2iPLKq3gXMHBqRvWFWLdjlaFawe_LV_397cJ4
The following example uses the MAC-H256 algorithm.¶
This is the Issuer's stable private key in the JWK format:¶
{
"kty": "EC",
"crv": "P-256",
"x": "k5RKy5wN-ywqh3iobcRD4u4N8QIBkMr4fmT0OSfTz0w",
"y": "iCy6DgL4KjCDmSkttS3P-sSoB8LsmQR-_slXCwAaagc",
"d": "5Wlvei1bXAN9fc91oxemDjItKdN5PlUSOjbxWfZ28iU"
}
This is the Issuer's ephemerally generated shared secret:¶
"f2hkyFM4yV5rLccERqvZlXzxrql0qgkd1owFEPSnP3o"
This is the Holder's presentation private key in the JWK format:¶
{
"kty": "EC",
"crv": "P-256",
"x": "hmjxiD8CRXXsaUYEM_A_0NFch8dW1raWWwJUu4n_acE",
"y": "PkDIm4IvHZ3xhIlyIobE_1js31Vfm5ROhu6T9LfXavw",
"d": "MVMzPQ1n7UOJrBobfCfnZHbISydiY5HGwtQKNmeh9d0"
}
For the following protected header and array of payloads:¶
{
"alg": "MAC-H256",
"typ": "JPT",
"iss": "https://issuer.example",
"claims": [
"iat",
"exp",
"family_name",
"given_name",
"email",
"address",
"age_over_21"
],
"presentation_key": {
"kty": "EC",
"crv": "P-256",
"use": "sign",
"x": "hmjxiD8CRXXsaUYEM_A_0NFch8dW1raWWwJUu4n_acE",
"y": "PkDIm4IvHZ3xhIlyIobE_1js31Vfm5ROhu6T9LfXavw"
}
}
[
1714521600,
1717199999,
"Doe",
"Jay",
"jaydoe@example.org",
{
"formatted": "1234 Main St.\nAnytown, CA 12345\nUSA",
"street_address": "1234 Main St.",
"locality": "Anytown",
"region": "CA",
"postal_code": 12345,
"country": "USA"
},
true
]
The first MAC is generated using the key issuer_header and a value of the issuer protected header as a UTF-8 encoded octet string. This results in the following MAC:¶
qFR4fdl1QHnxsUlnX-jQW2-sW8tPpG5ImEFVxRdYa78
The issuer generates an array of derived keys with one for each payload by using the shared secret as the key, and the index of the payload (as payload_{n} in UTF-8 encoded octets) as the input in a HMAC operation. This results in the following set of derived keys:¶
[ "tznFaFl8a6MnqopkeHPNRif5JBVtuj6gFzPTM1bTgXA", "GlrrCSfKCAR7S-RAi48XTuYjZryONsvbREqskg1xCn8", "VlhIA5fA-cwZYMjHljddVm8Rf1naD5yc2SS8t_7N1Ls", "Llemqv_epZ_n_yF5bwl2shH12tBbk7wvA77uONjevPE", "aS2KWXNFlbXBNDKPMFEHCqSmvUL2deN0T5Ijb-Ay1M8", "UQaI5A2WycpGA0EUJpbcpsz_7cUYShmdgurHwqODRmM", "br1Ew_k_srifcZrT65xPUqy4_Jjc_zI8rRPXU0Lzg1I" ]
A MAC is generated for each payload using the corresponding derived payload key. This results in the following set of MAC values:¶
[ "9ukeYcXtCuQ4g3QjSUkF8gLNtcW1FRclgWH7XXKeUiU", "zJwX1nEtiukeENLsZZO6zf6XJ7bZxa3aptto-280sl8", "A3qVZuAQtC2LUi3sdFOER-iJKM1YP7Ox85aDweYMOas", "ScSZfYHO0ujrs6bdTWKNqbRqbqXQylGgyYX_pFoj4ow", "iJfK1Lfc5rPJCjEyMD4TDD4Pb7q_fO_1A8ESevjRU-Y", "2GqjPNlJr62Q2SyqvPGnduklfxYddJQtdD9KGyLeEUs", "UEqHHyUcMqIJezEvYspNySqLUHKI9g3HeOD3BZpY8O0" ]
The issuer protected header MAC and the payload MAC octet strings are concatenated into a single value known as the combined MAC representation. This representation is signed with the issuer's private key.¶
The proof consists of two octet string values: the signature over the combined MAC representation, and the shared secret.¶
[ "UG-v3hXkQ6UWEKqtWwwthLqrFJ4pdxrxqkzqizO4BiQq3ZN9c1W0ZsNqQmKkSCuoBW E9pKvhv2WcFLwj4UcjwA", "MFSh_ddbWkfjXSJ5kUr69g13NEdN2u7MMpWNY4nmZDs" ]
The final issued JWP in JSON serialization is:¶
{
"issuer": "eyJhbGciOiJNQUMtSDI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBz
Oi8vaXNzdWVyLmV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hb
WUiLCJnaXZlbl9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicH
Jlc2VudGF0aW9uX2tleSI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwidXNlIjoic2l
nbiIsIngiOiJobWp4aUQ4Q1JYWHNhVVlFTV9BXzBORmNoOGRXMXJhV1d3SlV1NG5fYWNF
IiwieSI6IlBrREltNEl2SFozeGhJbHlJb2JFXzFqczMxVmZtNVJPaHU2VDlMZlhhdncif
X0",
"payloads": [
"MTcxNDUyMTYwMA",
"MTcxNzE5OTk5OQ",
"IkRvZSI",
"IkpheSI",
"ImpheWRvZUBleGFtcGxlLm9yZyI",
"eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxu
VVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxpdHkiOiJBb
nl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUsImNvdW50cnkiOi
JVU0EifQ",
"dHJ1ZQ"
],
"proof": [
"UG-v3hXkQ6UWEKqtWwwthLqrFJ4pdxrxqkzqizO4BiQq3ZN9c1W0ZsNqQmKkSCuo
BWE9pKvhv2WcFLwj4UcjwA",
"MFSh_ddbWkfjXSJ5kUr69g13NEdN2u7MMpWNY4nmZDs"
]
}
The same JWP in compact serialization:¶
eyJhbGciOiJNQUMtSDI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8vaXNzdWVyL mV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hbWUiLCJnaXZlbl 9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicHJlc2VudGF0aW9 uX2tleSI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwidXNlIjoic2lnbiIsIngiOiJo bWp4aUQ4Q1JYWHNhVVlFTV9BXzBORmNoOGRXMXJhV1d3SlV1NG5fYWNFIiwieSI6IlBrR EltNEl2SFozeGhJbHlJb2JFXzFqczMxVmZtNVJPaHU2VDlMZlhhdncifX0.MTcxNDUyMT YwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~ImpheWRvZUBleGFtcGxlLm9yZyI~eyJmb 3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxuVVNBIiwic3 RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxpdHkiOiJBbnl0b3duIiw icmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUsImNvdW50cnkiOiJVU0EifQ~d HJ1ZQ.UG-v3hXkQ6UWEKqtWwwthLqrFJ4pdxrxqkzqizO4BiQq3ZN9c1W0ZsNqQmKkSCu oBWE9pKvhv2WcFLwj4UcjwA~MFSh_ddbWkfjXSJ5kUr69g13NEdN2u7MMpWNY4nmZDs
Next, we show the presentation of the JWP with selective disclosure.¶
For presentation with the following presentation protected header:¶
{
"alg": "MAC-H256",
"aud": "https://recipient.example.com",
"nonce": "MsWt5u0oUDYCBE6s0B03f4tvLeM2LL-94woA_0_vCpY"
}
The holder will take the issuer proof (including shared secret) and derive the same individual payload MAC values (above).¶
In this case, the holder has decided not to disclose the last three claims provided by the issuer (corresponding to email, address, and age_over_21)¶
For the disclosed payloads, the holder will provide the corresponding derived key. For the non-disclosed payloads, the holder will provide the corresponding MAC value.¶
The final presented proof value is an array of octet strings. The contents are presentation header signature, followed by the issuer signature, then the value disclosed by the holder for each payload. This results in the following proof:¶
[ "vYe2kILDIrFtopZ1v3mc_stJaj8s6XqLgQNETb_2xJHR4QNsuuId9AUWJzXmGORbkQ 2ya2Uuo6tJB8B6SwT5SA", "UG-v3hXkQ6UWEKqtWwwthLqrFJ4pdxrxqkzqizO4BiQq3ZN9c1W0ZsNqQmKkSCuoBW E9pKvhv2WcFLwj4UcjwA", "tznFaFl8a6MnqopkeHPNRif5JBVtuj6gFzPTM1bTgXA", "GlrrCSfKCAR7S-RAi48XTuYjZryONsvbREqskg1xCn8", "VlhIA5fA-cwZYMjHljddVm8Rf1naD5yc2SS8t_7N1Ls", "Llemqv_epZ_n_yF5bwl2shH12tBbk7wvA77uONjevPE", "iJfK1Lfc5rPJCjEyMD4TDD4Pb7q_fO_1A8ESevjRU-Y", "2GqjPNlJr62Q2SyqvPGnduklfxYddJQtdD9KGyLeEUs", "UEqHHyUcMqIJezEvYspNySqLUHKI9g3HeOD3BZpY8O0" ]
The final presented JWP in JSON serialization is:¶
{
"presentation": "eyJhbGciOiJNQUMtSDI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaX
BpZW50LmV4YW1wbGUuY29tIiwibm9uY2UiOiJNc1d0NXUwb1VEWUNCRTZzMEIwM2Y0dHZ
MZU0yTEwtOTR3b0FfMF92Q3BZIn0",
"issuer": "eyJhbGciOiJNQUMtSDI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBz
Oi8vaXNzdWVyLmV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hb
WUiLCJnaXZlbl9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicH
Jlc2VudGF0aW9uX2tleSI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwidXNlIjoic2l
nbiIsIngiOiJobWp4aUQ4Q1JYWHNhVVlFTV9BXzBORmNoOGRXMXJhV1d3SlV1NG5fYWNF
IiwieSI6IlBrREltNEl2SFozeGhJbHlJb2JFXzFqczMxVmZtNVJPaHU2VDlMZlhhdncif
X0",
"payloads": [
"MTcxNDUyMTYwMA",
"MTcxNzE5OTk5OQ",
"IkRvZSI",
"IkpheSI",
null,
null,
null
],
"proof": [
"vYe2kILDIrFtopZ1v3mc_stJaj8s6XqLgQNETb_2xJHR4QNsuuId9AUWJzXmGORb
kQ2ya2Uuo6tJB8B6SwT5SA",
"UG-v3hXkQ6UWEKqtWwwthLqrFJ4pdxrxqkzqizO4BiQq3ZN9c1W0ZsNqQmKkSCuo
BWE9pKvhv2WcFLwj4UcjwA",
"tznFaFl8a6MnqopkeHPNRif5JBVtuj6gFzPTM1bTgXA",
"GlrrCSfKCAR7S-RAi48XTuYjZryONsvbREqskg1xCn8",
"VlhIA5fA-cwZYMjHljddVm8Rf1naD5yc2SS8t_7N1Ls",
"Llemqv_epZ_n_yF5bwl2shH12tBbk7wvA77uONjevPE",
"iJfK1Lfc5rPJCjEyMD4TDD4Pb7q_fO_1A8ESevjRU-Y",
"2GqjPNlJr62Q2SyqvPGnduklfxYddJQtdD9KGyLeEUs",
"UEqHHyUcMqIJezEvYspNySqLUHKI9g3HeOD3BZpY8O0"
]
}
The same JWP in compact serialization:¶
eyJhbGciOiJNQUMtSDI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaXBpZW50LmV4YW1wbGUuY 29tIiwibm9uY2UiOiJNc1d0NXUwb1VEWUNCRTZzMEIwM2Y0dHZMZU0yTEwtOTR3b0FfMF 92Q3BZIn0.eyJhbGciOiJNQUMtSDI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8 vaXNzdWVyLmV4YW1wbGUiLCJjbGFpbXMiOlsiaWF0IiwiZXhwIiwiZmFtaWx5X25hbWUi LCJnaXZlbl9uYW1lIiwiZW1haWwiLCJhZGRyZXNzIiwiYWdlX292ZXJfMjEiXSwicHJlc 2VudGF0aW9uX2tleSI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwidXNlIjoic2lnbi IsIngiOiJobWp4aUQ4Q1JYWHNhVVlFTV9BXzBORmNoOGRXMXJhV1d3SlV1NG5fYWNFIiw ieSI6IlBrREltNEl2SFozeGhJbHlJb2JFXzFqczMxVmZtNVJPaHU2VDlMZlhhdncifX0. MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~~~.vYe2kILDIrFtopZ1v3mc _stJaj8s6XqLgQNETb_2xJHR4QNsuuId9AUWJzXmGORbkQ2ya2Uuo6tJB8B6SwT5SA~UG -v3hXkQ6UWEKqtWwwthLqrFJ4pdxrxqkzqizO4BiQq3ZN9c1W0ZsNqQmKkSCuoBWE9pKv hv2WcFLwj4UcjwA~tznFaFl8a6MnqopkeHPNRif5JBVtuj6gFzPTM1bTgXA~GlrrCSfKC AR7S-RAi48XTuYjZryONsvbREqskg1xCn8~VlhIA5fA-cwZYMjHljddVm8Rf1naD5yc2S S8t_7N1Ls~Llemqv_epZ_n_yF5bwl2shH12tBbk7wvA77uONjevPE~iJfK1Lfc5rPJCjE yMD4TDD4Pb7q_fO_1A8ESevjRU-Y~2GqjPNlJr62Q2SyqvPGnduklfxYddJQtdD9KGyLe EUs~UEqHHyUcMqIJezEvYspNySqLUHKI9g3HeOD3BZpY8O0
This work was incubated in the DIF Applied Cryptography Working Group.¶
We would like to thank Alberto Solavagione for his valuable contributions to this specification.¶
The BBS examples were generated using the library at https://github.com/mattrglobal/pairing_crypto .¶
[[ To be removed from the final specification ]]¶
-latest¶
-08¶
-07¶
proof_key and presentation_key names¶
proof_jwk to proof_key and presentation_jwk to
presentation_key to better represent that the key may be JSON
or CBOR-formatted.¶
proof_key and presentation_key to JWP
where they are defined. Consolidated usage, purpose and
requirements from algorith musage under these definitions.¶
BBS-PROOF into BBS¶
-06¶
presentation_header.¶
pjwk to presentation_jwk¶
-05¶
-04¶
BBS-DRAFT-5 to BBS, and from BBS-PROOF-DRAFT-5 to BBS-PROOF¶
BBS_BLS12381G1_XMD:SHA-256_SSWU_RO_¶
-03¶
-02¶
BBS-DRAFT-3 and BBS-PROOF-DRAFT-3 algorithms based on draft-irtf-cfrg-bbs-signatures-03.¶
BBS-X algorithm based on a particular implementation of earlier drafts.¶
-01¶
issuer_header and presentation_header¶
-00¶