Struct ring::aead::chacha20_poly1305_openssh::OpeningKey

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pub struct OpeningKey { /* private fields */ }
Expand description

A key for opening packets.

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impl OpeningKey

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pub fn new(key_material: &[u8; 64]) -> Self

Constructs a new OpeningKey.

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pub fn decrypt_packet_length( &self, sequence_number: u32, encrypted_packet_length: [u8; 4], ) -> [u8; 4]

Returns the decrypted, but unauthenticated, packet length.

Importantly, the result won’t be authenticated until open_in_place is called.

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pub fn open_in_place<'a>( &self, sequence_number: u32, ciphertext_in_plaintext_out: &'a mut [u8], tag: &[u8; 16], ) -> Result<&'a [u8], Unspecified>

Opens (authenticates and decrypts) a packet.

ciphertext_in_plaintext_out must be of the form encrypted_packet_length||ciphertext where ciphertext is the encrypted plaintext. When the function succeeds the ciphertext is replaced by the plaintext and the result is Ok(plaintext), where plaintext is &ciphertext_in_plaintext_out[PACKET_LENGTH_LEN..]; otherwise the contents of ciphertext_in_plaintext_out are unspecified and must not be used.

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