# Add a checksum

## <img src="/files/7y3gGJuTnkLAH0Wppnhr" alt="" data-size="line"> Add a checksum

### Description <a href="#description" id="description"></a>

The Add a Checksum transform calculates checksums for one or more fields in the input stream and adds this to the output as a new field.

| <h3 id="supported_engines">Supported Engines</h3> |
| ------------------------------------------------- |

| Hop Engine | <sup>✓</sup> |
| ---------- | ------------ |
| Spark      | <sup>✓</sup> |
| Flink      | <sup>✓</sup> |
| Dataflow   | <sup>✓</sup> |

### Options

| Option                      | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| --------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Transform name              | Name of the transform. Note: This name has to be unique in a single pipeline.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Type                        | <p>The type of checksum that needs to be calculated. These are the types that are available:</p><ul><li>CRC32 : 32-bit Cyclic Redundancy Check : <a href="http://en.wikipedia.org/wiki/Cyclic_redundancy_check"><http://en.wikipedia.org/wiki/Cyclic_redundancy_check></a></li><li>ADLER 32 : Checksum algorithm by Mark Adler: <a href="http://en.wikipedia.org/wiki/Adler-32"><http://en.wikipedia.org/wiki/Adler-32></a></li><li>MD5 : Message Digest algorithm 5 : <a href="http://en.wikipedia.org/wiki/MD5"><http://en.wikipedia.org/wiki/MD5></a></li><li>SHA-1 : Secure Hash Algorithm 1 : <a href="http://en.wikipedia.org/wiki/SHA-1"><http://en.wikipedia.org/wiki/SHA-1></a></li><li>SHA-256 : Secure Hash Algorithm 2 : <a href="http://en.wikipedia.org/wiki/SHA-256"><http://en.wikipedia.org/wiki/SHA-256></a></li></ul> |
| Result Type                 | Some checksum types allow to set different result types: String, Hexadecimal and Binary                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Result field                | The name of the result field containing the checksum                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Fields used in the checksum | The names of the fields to include in the checksum calculation. Note: You can use the "Get Fields" button to insert all input fields from previous transforms.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |


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