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# SecureEnclave.P256.Signing.PrivateKey

A P-256 private key used for signing.

```
struct PrivateKey
```

## Topics

### Creating a private key

[`init(dataRepresentation:authenticationContext:)`](/documentation/CryptoKit/SecureEnclave/P256/Signing/PrivateKey/init(dataRepresentation:authenticationContext:))

Creates a P-256 private key for signing from a data
representation of the key with the given authentication
context.

[`init(compactRepresentable:accessControl:authenticationContext:)`](/documentation/CryptoKit/SecureEnclave/P256/Signing/PrivateKey/init(compactRepresentable:accessControl:authenticationContext:))

Creates a P-256 private key for signing with the
specified access control.

### Representing the key

[`dataRepresentation`](/documentation/CryptoKit/SecureEnclave/P256/Signing/PrivateKey/dataRepresentation)

A data representation of the private key.

### Getting the public key

[`publicKey`](/documentation/CryptoKit/SecureEnclave/P256/Signing/PrivateKey/publicKey)

The corresponding public key.

### Generating a signature

[`signature(for:)`](/documentation/CryptoKit/SecureEnclave/P256/Signing/PrivateKey/signature(for:)-3xogs)

Generates an Elliptic Curve Digital Signature Algorithm (ECDSA)
signature of the digest you provide over the P-256 elliptic curve.

[`signature(for:)`](/documentation/CryptoKit/SecureEnclave/P256/Signing/PrivateKey/signature(for:)-76j0u)

Generates an elliptic curve digital signature algorithm (ECDSA)
signature of the given data over the P-256 elliptic curve, using SHA-256
as the hash function.


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