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(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_secretstream_xchacha20poly1305_pull — Decrypt a chunk of data from an encrypted stream
&$state, string $ciphertext, string $additional_data = ""): array|false
Decrypt a chunk of data from an encrypted stream.
state
See sodium_crypto_secretstream_xchacha20poly1305_init_pull() and sodium_crypto_secretstream_xchacha20poly1305_init_push()
ciphertext
The ciphertext chunk to decrypt.
additional_data
Optional additional data to include in the authentication tag.
An array with two values:
string; The decrypted chunk
int; An optional tag (if provided during push). Possible values:
SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_MESSAGE:
the most common tag, that doesn't add any information about the nature of the message.
SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL:
indicates that the message marks the end of the stream, and erases the secret key used to encrypt the previous sequence.
SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH:
indicates that the message marks the end of a set of messages, but not the end of the stream.
For example, a huge JSON string sent as multiple chunks can use this tag to indicate to the application that the
string is complete and that it can be decoded. But the stream itself is not closed, and more data may follow.
SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY:
"forget" the key used to encrypt this message and the previous ones, and derive a new secret key.
