@transmute/ecdsakoblitzsignature2016 v0.1.5
EcdsaKoblitzSignature2016
A minimal implementation of EcdsaKoblitzSignature2016 in JavaScript.
Mostly to provide clarity around how complex linked data signature suites are, in the hope that future suites will be simpler, and less coupled to crypto currency libraries.
Signed with Public Key
As seen on https://json-ld.org/playground/
{
"@context": "https://w3id.org/identity/v1",
"givenName": "Alice",
"signature": {
"type": "EcdsaKoblitzSignature2016",
"created": "2019-01-09T20:22:03.149Z",
"creator": "ecdsa-koblitz-pubkey:02234be9bcdf041f7530979b8b88b7dc62dd505a75883c8211f3a8250534f96dc0",
"signatureValue": "IHFt7uxpLBhUC7BG9aiBVBtOmnYljhpCW5TL6I/v+iaRQmmxB9Bf8jBdr17XtDX4qNWq4i8Og8is/TWNEdgvz1Y="
}
}Signed by a DID
As seen here
{
"@context": "https://w3id.org/identity/v1",
"givenName": "Alice",
"signature": {
"type": "EcdsaKoblitzSignature2016",
"created": "2019-01-09T20:29:25.773Z",
"creator": "did:example:123#main-key",
"signatureValue": "IG93BohNGlH6R0NWJDtOX36tmVigDwwOglKgWYW0SAcoHkwn8YPS6xOSiRKW2DdJqY3BDNjrUIzSKSMcllo2VmQ="
}
}Signed with Bitcoin Address (livenet assumed)
As seen here
IMO best not to use addresses for signature suites
{
"@context": "https://w3id.org/identity/v1",
"givenName": "Alice",
"signature": {
"type": "EcdsaKoblitzSignature2016",
"created": "2019-01-05T02:41:07Z",
"creator": "ecdsa-koblitz-pubkey:1LGpGhGK8whX23ZNdxrgtjKrek9rP4xWER",
"signatureValue": "Hxf15psaaHq4S43I2KVq6NZflXbC6lHXMNJmcKo8MYszLxjoPCnlPqcwmIqBgWUUesO7wpq9nSNKH1kT4F720w0="
}
}Alternative Implementations
- https://github.com/jolocom/jolocom-lib
- https://github.com/uport-project/did-jwt
- https://github.com/transmute-industries/PROPOSAL-EcdsaKoblitzSignature2019
Jolocom claims to be using EcdsaKoblitzSignature2016, but implements the signature algorithm differently then jsonld-signatures. This library does not work with Jolocom for this reason.
UPort claims to be supporting Secp256k1VerificationKey2018, Secp256k1SignatureVerificationKey2018, EcdsaPublicKeySecp256k1, these are not compatible with EcdsaKoblitzSignature2016 or Jolocom's version, but are closer, because both UPort and Jolocom are simply signing a digest.
PROPOSAL-EcdsaKoblitzSignature2019 is just a proposal, but its based off of RsaSignature2017. This library does not work with PROPOSAL-EcdsaKoblitzSignature2019.
License Notes
Works with: https://github.com/digitalbazaar/jsonld-signatures,
jsonld-signatures is BSD 3-Clause License
Copyright (c) 2010-2018 Digital Bazaar, Inc.The transformations to json documents before signing are copied here to provide a single view of what is happening. They have not been altered.