sodium_crypto_aead_aes256gcm_encrypt

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_aead_aes256gcm_encrypt — Encrypt then authenticate with AES-256-GCM

sodium_crypto_aead_aes256gcm_encrypt(
    string $message,
    string $additional_data,
    string $nonce,
    string $key
): string

Encrypt then authenticate with AES-256-GCM. Only available if sodium_crypto_aead_aes256gcm_is_available() returns true.

message: The plaintext message to encrypt.
additional_data: Additional, authenticated data. This is used in the verification of the authentication tag appended to the ciphertext, but it is not encrypted or stored in the ciphertext.
nonce: A number that must be only used once, per message. 12 bytes long.
key: Encryption key (256-bit).

Returns the ciphertext and authentication tag as a string of raw binary bytes. (Format: ciphertext, then tag.)

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