sodium_crypto_sign_publickey_from_secretkey

Using the php Function Sodium_Crypto_Sign_PublicKeyFrom_SecretKey

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This function does not work for Nano, as it requires a 64 bytes keypair, while the private key is only 32 bytes in Nano. This is due to the fact that Nano uses a variant of Ed25519, which is not supported by the standard Libsodium library. Instead, you need to use the functions sodium_base642bin and sodium_bin2base64 for decoding/encoding the raw binary. Also try sodium_aead_chacha20poly1305_ietf_keygen for generating a random ChaCha20-Poly1305 (IETF) key.

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sodium_crypto_sign_publickey_from_secretkey example

public static function crypto_sign_publickey_from_secretkey($secretKey)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new SodiumException('Argument 1 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_publickey_from_secretkey($secretKey);
        }
        if (self::use_fallback('crypto_sign_publickey_from_secretkey')) {
            return (string) call_user_func('\\Sodium\\crypto_sign_publickey_from_secretkey', $secretKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_Ed25519::publickey_from_secretkey($secretKey);
        }
        return ParagonIE_Sodium_Core_Ed25519::publickey_from_secretkey($secretKey);
    }

    /** * Extract an Ed25519 secret key from an Ed25519 keypair. * * @param string $keypair Keypair * @return string Secret key * @throws SodiumException * @throws TypeError * @psalm-suppress MixedArgument */