libdar::blowfish Class Reference
[Private]

blowfish implementation of encryption More...

#include <crypto.hpp>

Inherits libdar::tronconneuse.

List of all members.

Protected Member Functions
U_32	encrypted_block_size_for (U_32 clear_block_size)
	defines the size necessary to encrypt a given amount of clear data
U_32	clear_block_allocated_size_for (U_32 clear_block_size)
	it may be necessary by the inherited class have few more bytes allocated after the clear data given for encryption
U_32	encrypt_data (const infinint &block_num, const char *clear_buf, const U_32 clear_size, const U_32 clear_allocated, char *crypt_buf, U_32 crypt_size)
	this method encrypts the clear data given
U_32	decrypt_data (const infinint &block_num, const char *crypt_buf, const U_32 crypt_size, char *clear_buf, U_32 clear_size)
	this method is for decrypts data

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Detailed Description

blowfish implementation of encryption

inherited class from tronconneuse class

Definition at line 64 of file crypto.hpp.

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Member Function Documentation

U_32 libdar::blowfish::clear_block_allocated_size_for (  U_32  clear_block_size  )  [protected, virtual]

it may be necessary by the inherited class have few more bytes allocated after the clear data given for encryption Parameters: [in]  clear_block_size  is the size in byte of the clear data that will be asked to encrypt. Returns: the requested allocated buffer size (at least the size of the clear data). Note: when giving clear buffer of data of size "clear_block_size" some inherited class may requested that a bit more of data must be allocated. this is to avoid copying data when the algorithm needs to add some data after the clear data before encryption. Implements libdar::tronconneuse.

U_32 libdar::blowfish::decrypt_data (  const infinint &  block_num, const char *  crypt_buf, const U_32  crypt_size, char *  clear_buf, U_32  clear_size )  [protected, virtual]

this method is for decrypts data Parameters: [in]  block_num  block number of the data to decrypt. [in]  crypt_buf  pointer to the first byte of encrypted data. [in]  crypt_size  size of encrypted data to decrypt. [in,out]  clear_buf  pointer where to put clear data. [in]  clear_size  allocated size of clear_buf. Returns: is the amount of data put in clear_buf (<= clear_size) Implements libdar::tronconneuse.

U_32 libdar::blowfish::encrypt_data (  const infinint &  block_num, const char *  clear_buf, const U_32  clear_size, const U_32  clear_allocated, char *  crypt_buf, U_32  crypt_size )  [protected, virtual]

this method encrypts the clear data given Parameters: block_num  is the number of the block to which correspond the given data, This is an informational field for inherited classes. [in]  clear_buf  points to the first byte of clear data to encrypt. [in]  clear_size  is the length in byte of data to encrypt. [in]  clear_allocated  is the size of the allocated memory (modifiable bytes) in clear_buf. [in,out]  crypt_buf  is the area where to put corresponding encrypted data. [in]  crypt_size  is the allocated memory size for crypt_buf. Returns: is the amount of data put in crypt_buf (<= crypt_size). Note: it must respect that : returned value = encrypted_block_size_for(clear_size argument) Implements libdar::tronconneuse.

U_32 libdar::blowfish::encrypted_block_size_for (  U_32  clear_block_size  )  [protected, virtual]

defines the size necessary to encrypt a given amount of clear data Parameters: [in]  clear_block_size  is the size of the clear block to encrypt. Returns: the size of the memory to allocate to receive corresponding encrypted data. Note: this implies that encryption algorithm must always generate a fixed size encrypted block of data for a given fixed size block of data. However, the size of the encrypted block of data may differ from the size of the clear block of data Implements libdar::tronconneuse.

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The documentation for this class was generated from the following file:

• crypto.hpp

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