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int chacha20_init(void **pState,
const uint8_t *key,
size_t keySize,
const uint8_t *nonce,
size_t nonceSize);
int chacha20_destroy(void *state);
int chacha20_encrypt(void *state,
const uint8_t in[],
uint8_t out[],
size_t len);
int chacha20_seek(void *state,
unsigned long block_high,
unsigned long block_low,
unsigned offset);
int hchacha20( const uint8_t key[32],
const uint8_t nonce16[16],
uint8_t subkey[32]);
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ChaCha20CipherzChaCha20 (or XChaCha20) cipher object.
Do not create it directly. Use :py:func:`new` instead.
:var nonce: The nonce with length 8, 12 or 24 bytes
:vartype nonce: bytes
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R"4;??#4#4#4#EG G r Nc l d| j vrt d d| _ | || S )a Encrypt a piece of data.
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plaintext(bytes/bytearray/memoryview): The data to encrypt, of any size.
Keyword Args:
output(bytes/bytearray/memoryview): The location where the ciphertext
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Returns:
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Args:
ciphertext(bytes/bytearray/memoryview): The data to decrypt, of any size.
Keyword Args:
output(bytes/bytearray/memoryview): The location where the plaintext
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d|| j fz dS )zSeek to a certain position in the key stream.
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position (integer):
The absolute position within the key stream, in bytes.
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block_sizer/ r% r2 r& rF r r r r R s J G G G@0 0 0 0$ 8; ; ; ;,V V V V Vr r c \ t | dk rt d |t d x}}n>t | dk rd|z }n%t | dk r|}nt d t | | d }|dd
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r z-Poly1305 with ChaCha20 requires a 32-byte keyN r" z6Poly1305 with ChaCha20 requires an 8- or 12-byte nonce)r r s r )r r r newr% )r r padded_noncerss r _derive_Poly1305_key_pairrS s 3xx2~~HIII } / 3 33 uu Uq +U2 Ur QRRR L ) ) ) 1 1, ? ?B
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| z t || S ) a} Create a new ChaCha20 or XChaCha20 cipher
Keyword Args:
key (bytes/bytearray/memoryview): The secret key to use.
It must be 32 bytes long.
nonce (bytes/bytearray/memoryview): A mandatory value that
must never be reused for any other encryption
done with this key.
For ChaCha20, it must be 8 or 12 bytes long.
For XChaCha20, it must be 24 bytes long.
If not provided, 8 bytes will be randomly generated
(you can find them back in the ``nonce`` attribute).
:Return: a :class:`Crypto.Cipher.ChaCha20.ChaCha20Cipher` object
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