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sodium_crypto_aead_aes256gcm_encrypt — Encrypt then authenticate with AES-256-GCM
$message
,$additional_data
,$nonce
,$key
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.)