> For the complete documentation index, see [llms.txt](https://legacy-docs.usesmileid.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://legacy-docs.usesmileid.com/integration-options/server-to-server/java/generate-signature.md).

# Signature

## Generating a Signature

### getSignatureKey

Use the getSignatureKey method to generate a signature

```java
import smile.identity.core.Signature;

/*
 You have two options for generating a signature:
 You can provide a timestamp string or we will generate a signature
 using the current time as the timestamp.
*/

// calling method without providing timestamp
Signature signature = new Signature(partnerId, apiKey);
SignatureKey key = signature.getSignatureKey();
String timestamp = key.getTimestamp();
String signature = key.getSignature();
// you can print the timestamp used in calculating your signature

// providing your own timestamp
Signature signature = new Signature(partnerId, apiKey);
String isoTimestamp = "2023-03-13T13:25:35.984437Z"; // ISO format or use String timestamp = Instant.now().toString();
SignatureKey key = signature.getSignatureKey(isoTimestamp);
String timestamp = key.getTimestamp();
String signature = key.getSignature();
```

## Confirming an Incoming Signature

### confirmSignature

Use the confirmSignature method to confirm the signature you receive while interacting with our servers.

Pass in the timestamp that was returned and the signature String. The method will return a boolean value. True for confirmed and False for unconfirmed

```java
import smile.identity.core.Signature;

Signature signature = new Signature(partnerId, apiKey);
boolean signatureConfirmed = signature.confirmSignature(timestamp, "receivedSignatureString");
```


---

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