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WebOfTrustInfo / ld-signatures-java

Java implementation of Linked Data Signatures
Apache License 2.0
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ld-signatures-java

Information

This is an implementation of the following cryptographic suites for Linked Data Proofs:

Maven

Build:

mvn clean install

Dependency:

<repositories>
    <repository>
        <id>danubetech-maven-public</id>
        <url>https://repo.danubetech.com/repository/maven-public/</url>
    </repository>
</repositories>

<dependency>
    <groupId>info.weboftrust</groupId>
    <artifactId>ld-signatures-java</artifactId>
    <version>1.6.0</version>
</dependency>

Example

Example JSON-LD document:

{
    "@context": {
        "schema": "http://schema.org/",
        "name": "schema:name",
        "homepage": "schema:url",
        "image": "schema:image"
    },
    "name": "Manu Sporny",
    "homepage": "https://manu.sporny.org/",
    "image": "https://manu.sporny.org/images/manu.png"
}

Example code:

JsonLDObject jsonLdObject = JsonLDObject.fromJson(new FileReader("input.jsonld"));

byte[] testEd25519PrivateKey = Hex.decodeHex("984b589e121040156838303f107e13150be4a80fc5088ccba0b0bdc9b1d89090de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());

Ed25519Signature2018LdSigner signer = new Ed25519Signature2018LdSigner(testEd25519PrivateKey);
signer.setCreated(new Date());
signer.setProofPurpose(LDSecurityKeywords.JSONLD_TERM_ASSERTIONMETHOD);
signer.setVerificationMethod(URI.create("https://example.com/jdoe/keys/1"));
signer.setDomain("example.com");
signer.setNonce("343s$FSFDa-");
LdProof ldProof = signer.sign(jsonLdObject);

System.out.println(jsonLdObject.toJson(true));

Example Linked Data Proof:

{
    "type": "Ed25519Signature2018",
    "created": "2020-10-15T09:42:46Z",
    "domain": "example.com",
    "nonce" : "343s$FSFDa-",
    "proofPurpose": "assertionMethod",
    "verificationMethod": "https://example.com/jdoe/keys/1",
    "jws": "eyJiNjQiOmZhbHNlLCJjcml0IjpbImI2NCJdLCJhbGciOiJFZERTQSJ9..8sFJcDtO_pYLjIkJNKfIOL3IOgm_bpbOqqr8ha0ZDa-e6XorbywVQmFCATNXPqMV10deru-zajF79tVelKo-Bw"
}

About

Danube Tech - https://danubetech.com/

Originally built during Rebooting Web-of-Trust in Paris on April 21st 2017.


This software library is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 871932