data-integrity-java

Information

This library is a direct continuation of our earlier library ld-signatures-java.

It provides an implementation of the following proof types for Data Integrity:

• DataIntegrityProof
• JsonWebSignature2020
• Ed25519Signature2018
• Ed25519Signature2020
• EcdsaSecp256k1Signature2019
• EcdsaSecp256r1Signature2019
• EcdsaSecp384r1Signature2019
• RsaSignature2018
• JcsEd25519Signature2020
• JcsEcdsaSecp256k1Signature2019

For DataIntegrityProof, this implementation supports the following cryptosuites:

• eddsa-rdfc-2022
• eddsa-jcs-2022
• ecdsa-rdfc-2019
• ecdsa-jcs-2019
• bip340-rdfc-2025
• bip340-jcs-2025

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>com.danubetech</groupId>
<artifactId>data-integrity-java</artifactId>
<version>1.18-SNAPSHOT</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(DataIntegrityKeywords.JSONLD_TERM_ASSERTIONMETHOD);
signer.setVerificationMethod(URI.create("https://example.com/jdoe/keys/1"));
signer.setDomain("example.com");
signer.setNonce("343s$FSFDa-");
DataIntegrityProof dataIntegrityProof = 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