PHP Manual
Sodium Functions
Convert an Ed25519 secret key to a Curve25519 secret key

sodium_crypto_sign_ed25519_sk_to_curve25519

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_sign_ed25519_sk_to_curve25519 — Convert an Ed25519 secret key to a Curve25519 secret key

Description

sodium_crypto_sign_ed25519_sk_to_curve25519(string $secret_key): string

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

Parameters

secret_key: Secret key suitable for the crypto_sign functions.

Return Values

Secret key suitable for the crypto_box functions.

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