objecthash-java

Build jar with dependencies

docker run --rm --volume "$PWD":/usr/src/objecthash-java --workdir /usr/src/objecthash-java openjdk:8 bash -c "./gradlew fatJar"

objecthash-java is a Java version of Ben Laurie's objecthash.

This will be used by openregister-java to provide a verifiable log of data. For more details see the following RFCs:

• RFC 9: Entry hash
• RFC 10: Item hash

Differences from the original objecthash algorithm

Types

The set of types supported this objecthash implementation are:

• Integer
• Unicode string
• List
• Set
• Hash
• Timestamp
• Raw

Timestamp is an extension. It represents a datetime in UTC with seconds precision, and is encoded by taking the ISO8601 string representation and prefixing with the tag "t".

Raw is also an extension. It is equivalent to the string type but signifies that the value is a raw byte array rather than human readable text.

objecthash-java does not implement Boolean or Float types.

Redacting primitive values

TODO

Examples

Hash a single value:

ObjectHash.stringToHexDigest("Hello world"); // bd75f78d2f7aa16b72d9fcdb822754a10310ef4cd5b6cca6aa48d98331e246ab

Dependencies

• Java 8

Licence

MIT License