---
title: "SignatureKeySource"
canonical_url: "https://www.nutrient.io/api/python/enums/signature-key-source/"
md_url: "https://www.nutrient.io/api/python/enums/signature-key-source.md"
last_updated: "2026-09-02T09:34:35.870Z"
description: "Specifies where the signing key and certificate come from."
---

Specifies where the signing key and certificate come from.

```python

from nutrient_sdk import SignatureKeySource

```

## Values

| Name                                           | Value | Description                                                                                                        |
| ---------------------------------------------- | ----- | ------------------------------------------------------------------------------------------------------------------ |
| `SignatureKeySource.PKCS12`                    | `0`   | A PKCS#12 / PFX container supplied by path or stream. This is the default.                                         |

| `SignatureKeySource.WINDOWS_CERTIFICATE_STORE` | `1`   | A certificate located in the operating-system certificate store by serial number (Windows only).                   |
| `SignatureKeySource.SMART_CARD`                | `2`   | A smartcard-resident key located by certificate serial number and unlocked with a PIN (Windows only).              |
| `SignatureKeySource.PKCS11`                    | `3`   | A key held by a PKCS#11 (Cryptoki) module — hardware security modules, USB tokens and smartcards, on any platform. |

## Usage Example

```python

from nutrient_sdk import SignatureKeySource

# Access enum values

value = SignatureKeySource.PKCS12
print(f"Value: {value}")  # Output: Value: SignatureKeySource.PKCS12

print(f"Integer value: {value.value}")  # Output: Integer value: 0

```

---

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