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<sodium_crypto_sign_detachedsodium_crypto_sign_ed25519_sk_to_curve25519>
^Sodium FunctionsLast updated: Mon, 26 Oct 2026

sodium_crypto_sign_ed25519_pk_to_curve25519

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_sign_ed25519_pk_to_curve25519 — Convert an Ed25519 public key to a Curve25519 public key

Description

function sodium_crypto_sign_ed25519_pk_to_curve25519(string $public_key): string

Given an Ed25519 public key, calculate the birationally equivalent X25519 public key.

Parameters

public_key

Public key suitable for the crypto_sign functions.

Return Values

Public key suitable for the crypto_box functions.


<sodium_crypto_sign_detachedsodium_crypto_sign_ed25519_sk_to_curve25519>
^Sodium FunctionsLast updated: Mon, 26 Oct 2026