Package tlslite :: Package utils :: Module aesgcm :: Class AESGCM

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Class AESGCM

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AES-GCM implementation. Note: this implementation does not attempt to be side-channel resistant. It's also rather slow.

Instance Methods

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__init__(self, key, implementation, rawAesEncrypt)
x.__init__(...) initializes x; see help(type(x)) for signature

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_auth(self, ciphertext, ad, tagMask)

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_mul(self, y)
Returns y*H, where H is the GCM key.

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_rawAesCtrEncrypt(self, counter, inp)
Encrypts (or decrypts) plaintext with AES-CTR.

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_update(self, y, data)

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open(self, nonce, ciphertext, data)
Decrypts and authenticates ciphertext using nonce and data.

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seal(self, nonce, plaintext, data)
Encrypts and authenticates plaintext using nonce and data.

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Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Static Methods

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_gcmAdd(x, y)

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_gcmShift(x)

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_inc32(counter)

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_reverseBits(i)

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Class Variables

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_gcmReductionTable = [0, 7200, 14400, 9312, 28800, 27808, 1862...

Properties

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Inherited from object: __class__

Method Details

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init(self, key, implementation, rawAesEncrypt)
(Constructor)

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x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__: (inherited documentation)

_rawAesCtrEncrypt(self, counter, inp)

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Encrypts (or decrypts) plaintext with AES-CTR. counter is modified.

open(self, nonce, ciphertext, data)

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Decrypts and authenticates ciphertext using nonce and data. If the tag is valid, the plaintext is returned. If the tag is invalid, returns None.

seal(self, nonce, plaintext, data)

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Encrypts and authenticates plaintext using nonce and data. Returns the ciphertext, consisting of the encrypted plaintext and tag concatenated.

Class Variable Details

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_gcmReductionTable

Value:

Class AESGCM

__init__(self, key, implementation, rawAesEncrypt) (Constructor)

_rawAesCtrEncrypt(self, counter, inp)

open(self, nonce, ciphertext, data)

seal(self, nonce, plaintext, data)

_gcmReductionTable

init(self, key, implementation, rawAesEncrypt)
(Constructor)