Create a unified keypair string from a secret key and public key

# sodium_crypto_box_keypair_from_secretkey_and_publickey

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_box_keypair_from_secretkey_and_publickey — Create a unified keypair string from a secret key and public key

### Description

sodium_crypto_box_keypair_from_secretkey_and_publickey(#[\SensitiveParameter] string `$secret_key`, string `$public_key`): string

This function exists to satisfy the API requirements of e.g. crypto_box(). Pass in one party's secret key and the other's public key, and you will obtain a "keypair" for your conversation.

### Parameters

`secret_key`
  Secret key.
`public_key`
  Public key.

### Return Values

X25519 Keypair.

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