---
title: "Signature Generation"
slug: "dsm-example-code-signature-generation"
updated: 2024-12-10T18:04:34Z
published: 2024-12-10T18:04:34Z
canonical: "support.fortanix.com/dsm-example-code-signature-generation"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://support.fortanix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Signature Generation

Supported by RSA and EC type of keys. For signature, one can pass one of the following inputs:

- **Data and Hash Alg**: Pass in the entire data to be signed with the Hash Algorithm to be used for hashing (SHA1, SHA256, SHA512, etc)
- **Hash**: Only pass the already hashed data. Also, pass the Hash Algorithm used to generate the said hash.

> [!NOTE]
> NOTE
> 
> Data and Hash should be base64 encoded.

- [Go](/docs/dsm-example-code-signature-generation#tabs-1)
- [Java](/docs/dsm-example-code-signature-generation#tabs-2)
- [Python](/docs/dsm-example-code-signature-generation#tabs-3)
- [REST API using curl](/docs/dsm-example-code-signature-generation#tabs-4)

### Go

```bash
data := byte[]("Hello World!")
keyId := <Key UUID>
signReq := sdkms.SignRequest{
            Data: &data,
            HashAlg: sdkms.DigestAlgorithmSha256,
            Key: sdkms.SobjectById(keyId),
}
signResp, err := client.Sign(ctx, signReq)
signResp.Signature

#With hash
signReq := sdkms.SignRequest{
            Hash: &hash,
            HashAlg: sdkms.DigestAlgorithmSha256,
            Key: sdkms.SobjectById(keyId),
}
signResp.Signature
```

### Java

```bash
// With data
String data = "Hello World!";
SignRequest signatureRequest = new SignRequest()
          .hashAlg(DigestAlgorithm.SHA256)
          .data(data.getBytes());
SignResponse signResponse = SignAndVerifyApi().sign(<Key UUID>, signatureRequest);
signResponse.signature

// With hash
SignRequest signatureRequest = new SignRequest()
          .hashAlg(DigestAlgorithm.SHA256)
          .hash(hash);
SignResponse signResponse = SignAndVerifyApi().sign(, signatureRequest);
signResponse.signature
```

### Python

```bash
api_instance = sdkms.v1.SignAndVerifyApi (api_client=client)
String data = "Hello World!";
request = sdkms.v1.SignRequest(hash_alg= DigestAlgorithm.SHA256, data=data.encode())
sign_response = api_instance.sign(<Key UUID>, request)
sign_response.signature

# With hash
request = sdkms.v1.SignRequest(hash_alg= DigestAlgorithm.SHA256, hash=hash)
sign_response = api_instance.sign(<Key UUID>, request)
sign_response.signature
```

### REST API using curl

```bash
$ echo "Hello World!" | base64
SGVsbG8gV29ybGQhCg==

$ curl /crypto/v1/sign -H 'Authorization: Bearer YhXwwa-6C...ig5g' -d '{"key": {"kid": "Key-UUID"}, "hash_alg": "SHA256", "data": "SGVsbG8gV29ybGQhCg=="}'
{"signature": "Y25lYm4gdmVidm...llamJ2ZWlqYgo=="}
```