tlslite.utils.chacha20_poly1305 module¶
Pure Python implementation of ChaCha20/Poly1305 AEAD cipher
Implementation that follows RFC 7539 and draft-ietf-tls-chacha20-poly1305-00
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class
tlslite.utils.chacha20_poly1305.
CHACHA20_POLY1305
(key, implementation)¶ Bases:
object
Pure python implementation of ChaCha20/Poly1305 AEAD cipher
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__init__
(key, implementation)¶ Set the initial state for the ChaCha20 AEAD
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open
(nonce, ciphertext, data)¶ Decrypts and authenticates ciphertext using nonce and data. If the tag is valid, the plaintext is returned. If the tag is invalid, returns None.
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static
pad16
(data)¶ Return padding for the Associated Authenticated Data
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static
poly1305_key_gen
(key, nonce)¶ Generate the key for the Poly1305 authenticator
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seal
(nonce, plaintext, data)¶ Encrypts and authenticates plaintext using nonce and data. Returns the ciphertext, consisting of the encrypted plaintext and tag concatenated.
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