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�
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Collection of all Keyczar classes used to perform cryptographic functions:
encrypt, decrypt, sign and verify.

@author: arkajit.dey@gmail.com (Arkajit Dey)
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d��n||_ntj|jj|j|j��}||j|<||j|j<q�WdS(NsUnacceptable purpose: %ssNeed encrypted reader.s/Key sets may only have a single primary version(tkeydatatKeyMetadatatReadtGetMetadatatmetadatat_keystNonetprimary_versionttypetdefault_sizetIsAcceptablePurposetpurposeterrorstKeyczarErrort	encryptedt
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KeyVersion(Rtk((s3/usr/lib/python2.7/site-packages/keyczar/keyczar.pyt<lambda>FstdocsList of versions in key set.cCs|j|j�S(N(RR	(R((s3/usr/lib/python2.7/site-packages/keyczar/keyczar.pyR$Iss!The primary key for this key set.cCs
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    Parse the header and verify version, format info. Return key if exists.

    @param header: the bytes of the header of Keyczar output
    @type header: string

    @return: the key identified by the hash in the header
    @rtype: L{keys.Key}

    @raise BadVersionError: if header specifies an illegal version
    @raise KeyNotFoundError: if key specified in header doesn't exist
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    Return a Keyczar object created from FileReader at given location.

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    (RRtCreateReader(tlocation((s3/usr/lib/python2.7/site-packages/keyczar/keyczar.pyRascCsdS(s4Indicates whether purpose is valid. Abstract method.N((RR
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    Returns the key associated with the given key_id, a hash or a version.

    @param key_id: Either the hash identifier of the key or its version.
    @type key_id: string or L{keydata.KeyVersion}

    @return: key associated with this key_id or None if key_id doesn't exist.
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    @raise KeyNotFoundError: if key with given key_id doesn't exist
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    Adds a new key version with given status to key set.

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    @param status: the status of the new key to be added
    @type status: L{keyinfo.KeyStatus}

    @param size: size of key in bits, uses default size if not provided.
    @type size: integer

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    Demotes the status of key with given version number.

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    Write this key set to the specified location.

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    Encrypt the data and return the ciphertext.

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    @return: ciphertext, by default Base64 encoded
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    Create an encrypting stream capable of writing a ciphertext byte stream
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    Defaults to base64 encoding with no padding or line breaks. 
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    @type encoder: 'file-like' object

    @return: an encrypting stream capable of creating a ciphertext byte stream
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    N(R<RRRpRtEncryptingStreamWriter(Rt
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    Verifies the signature in the signed blob corresponds to the data
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    @type signed_data: string

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    Verifies whether the signature corresponds to the given data. This is a
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    @param data: message that has been signed with sig
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    @type encoder: function

    @return: plaintext message
    @rtype: string

    @raise ShortCiphertextError: if length is too short to have Header, IV, Sig
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    @param buffer_size: Suggested buffer size for writing data (will be adjusted
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    @type buffer_size: integer

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  A utility object which holds a session key and, optionally, a nonce.  This class
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