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(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_kx_secretkey — Extract the secret key from a crypto_kx keypair.
$key_pair): string
Extract the secret key from a crypto_kx keypair.
key_pair
X25519 keypair, such as one generated by sodium_crypto_kx_keypair().
X25519 secret key.
