# Generate ECDSA Signature

Signs data using an Elliptic Curve Digital Signature Algorithm (ECDSA) private key.

In the diagram below, the dark rectangle represents the activity of signing some data using a private key that is stored at a safe location.

<figure><img src="/files/UuOmIg1ZHNz1wGPMfX8G" alt=""><figcaption></figcaption></figure>

Also see: [Create ECDSA Keys](/reference/plugins/overview/content/createecdsakeys.md), [Verify ECDSA Signature](/reference/plugins/overview/content/verifyecdsasignature.md).

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## Properties

### Private key

The private ECDSA key to use to generate the signed data (see [Create ECDSA Keys](/reference/plugins/overview/content/createecdsakeys.md)).\
The key can be given as a list of bytes or a base64 string.

### Hash algorithm

The hash algorithm to use when signing the data.

Options:

* SHA256 - [learn more](https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.sha256?view=net-7.0)
* SHA384 - [learn more](https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.sha384?view=net-7.0)
* SHA512 - [learn more](https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.sha512?view=net-7.0)

### Data

The data to sign. This can be a list of bytes or a base64 string.

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## Definition

The ECDSA signature in the form of a list of bytes.

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## Example

A simple usage scenario is where the private key is retrieved from a local database and used to sign some data which is received as input.

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## Links

* [Wikipedia: Elliptic Curve Digital Signature Algorithm](https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm)


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