https://github.com/danubetech/data-integrity-java

Java implementation of Data Integrity
https://github.com/danubetech/data-integrity-java

shared-libraries

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Java implementation of Data Integrity

• Host: GitHub
• URL: https://github.com/danubetech/data-integrity-java
• Owner: danubetech
• License: apache-2.0
• Created: 2025-02-22T17:45:37.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2025-12-13T13:35:08.000Z (2 months ago)
• Last Synced: 2025-12-15T02:10:52.625Z (about 2 months ago)
• Topics: shared-libraries
• Language: Java
• Homepage:
• Size: 262 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# data-integrity-java

## Information

**This library is a direct continuation of our earlier library [ld-signatures-java](https://github.com/weboftrustinfo/ld-signatures-java).**

It provides an implementation of the following proof types for [Data Integrity](https://www.w3.org/TR/vc-data-integrity/):

 - [DataIntegrityProof](https://www.w3.org/TR/vc-data-integrity/)

 - [JsonWebSignature2020](https://w3c-ccg.github.io/lds-jws2020/)

 - [Ed25519Signature2018](https://w3c-ccg.github.io/lds-ed25519-2018/)

 - [Ed25519Signature2020](https://www.w3.org/community/reports/credentials/CG-FINAL-di-eddsa-2020-20220724/)

 - [EcdsaSecp256k1Signature2019](https://w3c-ccg.github.io/lds-ecdsa-secp256k1-2019/)

 - [EcdsaSecp256r1Signature2019](https://www.w3.org/community/reports/credentials/CG-FINAL-di-ecdsa-2019-20220724/)

 - [EcdsaSecp384r1Signature2019](https://www.w3.org/community/reports/credentials/CG-FINAL-di-ecdsa-2019-20220724/)

 - [RsaSignature2018](https://w3c-ccg.github.io/lds-rsa2018/)

 - [JcsEd25519Signature2020](https://identity.foundation/JcsEd25519Signature2020/)

 - JcsEcdsaSecp256k1Signature2019

For [DataIntegrityProof](https://www.w3.org/TR/vc-data-integrity/), this implementation supports the following cryptosuites:

- [eddsa-rdfc-2022](https://www.w3.org/TR/vc-di-eddsa/)

- [eddsa-jcs-2022](https://www.w3.org/TR/vc-di-eddsa/)

- [ecdsa-rdfc-2019](https://www.w3.org/TR/vc-di-ecdsa/)

- [ecdsa-jcs-2019](https://www.w3.org/TR/vc-di-ecdsa/)

- [bip340-rdfc-2025](https://dcdpr.github.io/data-integrity-schnorr-secp256k1/)

- [bip340-jcs-2025](https://dcdpr.github.io/data-integrity-schnorr-secp256k1/)

## Maven

Build:

	mvn clean install

Dependency:

	

		

			danubetech-maven-public

			https://repo.danubetech.com/repository/maven-public/

		

	

	

		com.danubetech

		data-integrity-java

		1.18-SNAPSHOT

	

## 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](http://www.weboftrust.info/) 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