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object --+ | OfbMode
Output FeedBack (OFB).
This mode is very similar to CBC, but it transforms the underlying block cipher into a stream cipher.
The keystream is the iterated block encryption of the previous ciphertext block.
An Initialization Vector (IV) is required.
See NIST SP800-38A , Section 6.4.
Instance Methods | |||
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Inherited from |
Instance Variables | |
block_size The block size of the underlying cipher, in bytes. |
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iv The Initialization Vector originally used to create the object. The value does not change. |
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IV Alias for iv |
Properties | |
Inherited from |
Method Details |
Encrypt data with the key and the parameters set at initialization. A cipher object is stateful: once you have encrypted a message you cannot encrypt (or decrypt) another message using the same object. The data to encrypt can be broken up in two or more pieces and encrypt can be called multiple times. That is, the statement:
is equivalent to:
This function does not add any padding to the plaintext.
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Decrypt data with the key and the parameters set at initialization. A cipher object is stateful: once you have decrypted a message you cannot decrypt (or encrypt) another message with the same object. The data to decrypt can be broken up in two or more pieces and decrypt can be called multiple times. That is, the statement:
is equivalent to:
This function does not remove any padding from the plaintext.
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