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y
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) ÚKWModea Key Wrap (KW) mode.
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This is a deterministic Authenticated Encryption (AE) mode
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for protecting cryptographic keys. See `NIST SP800-38F`_.
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It provides both confidentiality and authenticity, and it designed
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so that any bit of the ciphertext depends on all bits of the plaintext.
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This mode is only available for ciphers that operate on 128 bits blocks
|
(e.g., AES).
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|
.. _`NIST SP800-38F`: http://csrc.nist.gov/publications/nistpubs/800-38F/SP-800-38F.pdf
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:undocumented: __init__
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ÚfactoryÚkeyc ó¸ |j | _ | j dk7 r t d« || _ |j ||j « | _ d| _ y )Né zKKey Wrap mode is only available for ciphers that operate on 128 bits blocksF)Ú
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block_sizeÚ
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a Encrypt and authenticate (wrap) a cryptographic key.
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Args:
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plaintext:
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The cryptographic key to wrap.
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It must be at least 16 bytes long, and its length
|
must be a multiple of 8.
|
|
Returns:
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The wrapped key.
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ú(The cipher cannot be used more than oncer z2The plaintext must have length multiple of 8 bytesr1 z,The plaintext must be at least 16 bytes longl zThe plaintext is too longó ¦¦¦¦¦¦¦¦T)r8 r3 r r" r7 )r9 r Úress r! Úsealz KWMode.sealL s ð ::Ü Ð GÓHÐ Hä y>AÒ Ü Ð QÓRÐ Rä y>BÒ Ü Ð KÓLÐ Lä y>UÒ "Ü Ð 8Ó9Ð 9ä Ð AÀIÑ MÓNØ
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r r# c óþ | j r t d« t |« dz r t d« t |« dk r t d« t | j |« }|dd dk7 r t d« d | _ |dd S )
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aw Decrypt and authenticate (unwrap) a cryptographic key.
|
|
Args:
|
ciphertext:
|
The cryptographic key to unwrap.
|
It must be at least 24 bytes long, and its length
|
must be a multiple of 8.
|
|
Returns:
|
The original key.
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|
Raises: ValueError
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If the ciphertext or the key are not valid.
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r< r z3The ciphertext must have length multiple of 8 bytesé z-The ciphertext must be at least 24 bytes longNr= z Incorrect integrity check valueT)r8 r3 r r+ r7 )r9 r# r* s r! Úunsealz KWMode.unseali s ð ::Ü Ð GÓHÐ Hä z?QÒ Ü Ð RÓSÐ Sä z?RÒ Ü Ð LÓMÐ Mä t|| ZÓ 0à bq6Ð8Ò 8Ü Ð >Ó?Ð ?Ø
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à!"v r N) Ú__name__Ú
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__module__Ú __qualname__Ú__doc__r r ÚbytesÚ bytearrayr: r? rB © r r! r- r- . s` ñð Ø$ð àE 9Ð ,Ñ-ó ðe E¨9Ð$4Ñ 5ð ¸%ó ð: u¨iÐ'7Ñ!8ð ¸Uô r r- r. Úkwargsc óv |d }t | |« S # t $ r }t dt |« z « d}~ww xY w)a Create a new block cipher in Key Wrap mode.
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|
Args:
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factory:
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A block cipher module, taken from `Crypto.Cipher`.
|
The cipher must have block length of 16 bytes, such as AES.
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|
Keywords:
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key:
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The secret key to use to seal or unseal.
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