Extract the public key from a crypto_kx keypair

# sodium_crypto_kx_publickey

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_kx_publickey — Extract the public key from a crypto_kx keypair

### Description

sodium_crypto_kx_publickey(#[\SensitiveParameter] string `$key_pair`): string

Extract the public key from a crypto_kx keypair.

### Parameters

`key_pair`
  X25519 keypair, such as one generated by sodium_crypto_kx_keypair().

### Return Values

X25519 public key.

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