Package DebTorrent :: Module BTcrypto :: Class Crypto

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Class Crypto

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Instance Methods

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__init__(self, initiator, disable_crypto=True)
Initialize the instance.

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received_key(self, k)
Process a received key.

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_gen_block3b(self, SKEY)

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boolean

test_skey(self, s, SKEY)
Check that the encoding matches the encoded value.

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set_skey(self, SKEY)

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string

VC_pattern(self)
Unknown.

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read(self, s)
Decrypt and pass on the decrypted value.

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write(self, s)
Encrypt and pass on the encrypted value.

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setrawaccess(self, _read, _write)
Setup the methods to call for reading and writing.

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string

padding(self)
Generate a random amount of random padding.

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Instance Variables

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string S
the DH secret number, encoded as a byte array

string _VC_pattern
the encrypted verification constant to expect from the peer

method _read
the method to call to read decrypted data

method _write
the method to call to write encrypted data

string block3a
first encryption block

string block3b
seconf encryption block

string block3bkey
key used to generate the second encryption block

method decrypt
the method to call to decrypt data

boolean disable_crypto
whether crypto has been disabled

method encrypt
the method to call to encrypt data

boolean initiator
whether the connection was initiated locally

int keylength
the key length to use

long privkey
randomly generated private key

string pubkey
public key corresponding to the private key

Method Details

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init(self, initiator, disable_crypto=True)
(Constructor)

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Initialize the instance.

Parameters:

initiator (boolean) - whether the connection was initiated locally
disable_crypto (boolean) - whether crypto has been disabled (optional, default is False)

Raises:

NotImplementedError - if encryption is not installed

received_key(self, k)

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Process a received key.

Parameters:

k (string) - the key that was received

_gen_block3b(self, SKEY)

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Parameters:

SKEY (string) - shared key (torrent info hash)

test_skey(self, s, SKEY)

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Check that the encoding matches the encoded value.

Parameters:

s (string) - second received encryption block to verify
SKEY (string) - shared key (torrent info hash)

Returns: boolean

whether the encoding of SKEY matches s

set_skey(self, SKEY)

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Parameters:

SKEY (string) - shared key (torrent info hash)

VC_pattern(self)

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Unknown.

Returns: string: the encrypted verification constant to expect from the peer

read(self, s)

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Decrypt and pass on the decrypted value.

Parameters:

s (string) - the string to decrypt

write(self, s)

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Encrypt and pass on the encrypted value.

Parameters:

s (string) - the string to encrypt

setrawaccess(self, _read, _write)

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Setup the methods to call for reading and writing.

Parameters:

_read (method) - the method to call for reading decrypted data
_write (method) - the method to call for writing encrypted data

padding(self)

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Generate a random amount of random padding.

Generates random bytes, with a random length from 16 to PAD_MAX.

Returns: string: the randomly generated padding

Class Crypto

__init__(self, initiator, disable_crypto=True) (Constructor)

received_key(self, k)

_gen_block3b(self, SKEY)

test_skey(self, s, SKEY)

set_skey(self, SKEY)

VC_pattern(self)

read(self, s)

write(self, s)

setrawaccess(self, _read, _write)

padding(self)

init(self, initiator, disable_crypto=True)
(Constructor)