---
title: P521
framework: cryptokit
role: symbol
role_heading: Enumeration
path: cryptokit/p521
---

# P521

An elliptic curve that enables NIST P-521 signatures and key agreement.

## Declaration

```swift
enum P521
```

## Topics

### Performing operations

- [P521.KeyAgreement](cryptokit/p521/keyagreement.md)
- [P521.Signing](cryptokit/p521/signing.md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Public key cryptography

- [Curve25519](cryptokit/curve25519.md)
- [P384](cryptokit/p384.md)
- [P256](cryptokit/p256.md)
- [SharedSecret](cryptokit/sharedsecret.md)
- [SecureEnclave](cryptokit/secureenclave.md)
- [HPKE](cryptokit/hpke.md)