---
title: Curve25519
framework: cryptokit
role: symbol
role_heading: Enumeration
path: cryptokit/curve25519
---

# Curve25519

An elliptic curve that enables X25519 key agreement and Ed25519 signatures.

## Declaration

```swift
enum Curve25519
```

## Topics

### Performing operations

- [Curve25519.KeyAgreement](cryptokit/curve25519/keyagreement.md)
- [Curve25519.Signing](cryptokit/curve25519/signing.md)

## Relationships

### Conforms To

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

## See Also

### Public key cryptography

- [P521](cryptokit/p521.md)
- [P384](cryptokit/p384.md)
- [P256](cryptokit/p256.md)
- [SharedSecret](cryptokit/sharedsecret.md)
- [SecureEnclave](cryptokit/secureenclave.md)
- [HPKE](cryptokit/hpke.md)