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(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_box_secretkey — crypto_box 鍵ペアから、秘密鍵を取り出す
key_pair
sodium_crypto_box_keypair() や sodium_crypto_box_seed_keypair() によって生成された鍵ペア
X25519 形式の秘密鍵を返します。