Sodium Functions
PHP Manual

sodium_crypto_sign_ed25519_sk_to_curve25519

Convert an Ed25519 secret key to a Curve25519 secret key

Description

string sodium_crypto_sign_ed25519_sk_to_curve25519(#[\SensitiveParameter]string $secret_key)

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.