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        "author": "Kurt Rose",
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        "description": "AES keywrap\n'''''''''''\nimplementation of RFC 3394 AES key wrapping/unwrapping\n\nhttp://www.ietf.org/rfc/rfc3394.txt\n\nalso, alternative IV per RFC 5649\n\nhttp://www.ietf.org/rfc/rfc5649.txt\n\nThis is a symmetric key-encryption algorithm.  It should only be used\nto encrypt keys (short and globally unique strings.)\n\nIn documentation, the key used for this kind of algorithm is\noften called the KEK (Key-Encryption-Key), to distinguish\nit from data encryption keys.\n\n\nusage\n'''''\n\n.. code-block:: python\n\n    import binascii\n    from aes_keywrap import aes_wrap_key, aes_unwrap_key\n    KEK = binascii.unhexlify(\"000102030405060708090A0B0C0D0E0F\")\n    CIPHER = binascii.unhexlify(\"1FA68B0A8112B447AEF34BD8FB5A7B829D3E862371D2CFE5\")\n    PLAIN = binascii.unhexlify(\"00112233445566778899AABBCCDDEEFF\")\n    assert aes_unwrap_key(KEK, CIPHER) == PLAIN\n    assert aes_wrap_key(KEK, PLAIN) == CIPHER\n\n\nWhy a special key-encryption algorithm?\n'''''''''''''''''''''''''''''''''''''''\n\nIn a word: size.  By assuming keys are high enough\nentropy to be globally unique, and small enough\nnot to require streaming encryption, aes-keywrap is able to avoid\nan IV (initial value) or nonce that increases the size\nof the ciphertext.  This can be a significant\nsavings -- if the data being encrypted is a 32\nbyte AES-256 key, AES-GCM would result in a\n60 byte ciphertext (87% overhead), AES-CTR or AES-CBC would result\nin a 48 byte ciphertext (50% overhead) and would also not provide\nauthenticated encryption, but aes-keywrap\nwould result in a 32 byte ciphertext (no overhead).\n\nIn an application where there are many keys being generated\nand encrypted (e.g. a separate data encryption key for\neach row in a database), this overhead can be significant.\n\nAnother important use case is compatibility with\nexisting systems.",
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