CryptoUtils Class Reference

Inheritance diagram for CryptoUtils:

Collaboration diagram for CryptoUtils:

List of all members.

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Detailed Description

Base class of all cryptographic and steganographic en- and decipherers with various required attributes and methods.

Author:

jhermes

Public Methods
Set< Character >	getAlphabet ()
void	setAlphabet (char[] alphabet)
String	replaceAll (String toProcess)
Map< String, String >	getReplacements ()
Public Static Methods
static char[]	getDefaultAlphabet ()
static char[]	getDefaultAlphabetWithoutChar (char ch)
static char[]	getTrithemianAlphabet ()
static Map< String, String >	trithemianAlphabetReplacements ()
Protected Methods
boolean	checkAlphabet (String alphabetString, char[] defaultAlphabet)
boolean	checkReplacements (String replacementString)
void	checkWSDeletion (String deleteWhitespace)
boolean	checkIntKey (String intKeyString, int defaultKey)
String	getAlphabetAsStringKey (int start)
Protected Attributes
char[]	alphabet
Map< String, String >	replacementMap
int	intKey
boolean	deleteWhitespace
Logger	logger = Logger.getLogger(this.getClass())

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Method Details

boolean checkAlphabet	(	String	alphabetString,
		char[]	defaultAlphabet
	)		[protected]

Builds alphabet from specified string, if not null and not empty. Else the specified default alphabet will be set as alphabet.

Parameters:

alphabetString	String to set as alphabet.
defaultAlphabet	default alphabet.

Returns:

true, if alphabetString can be set as alphabet, false if default alphabet is set.

boolean checkIntKey	(	String	intKeyString,
		int	defaultKey
	)		[protected]

Builds an integer key from the specified string.

Parameters:

intKeyString	integer key as string
defaultKey	key to set if integer key could not be build from specified string.

Returns:

true, if int key is builded from specified string, false otherwise.

boolean checkReplacements

(

String

replacementString

)

[protected]

Builds replacement map from specified string that should be parsable CSV data.

Parameters:

replacementString

replacements as csv data.

Returns:

true, if replacement map could be build, false otherwise.

void checkWSDeletion

(

String

deleteWhitespace

)

[protected]

If specified string equals true, whitespace will be deleted in the substituted text.

Parameters:

deleteWhitespace

boolean value as string

Set<Character> getAlphabet

(

)

Returns the alphabet of this crypto component.

Returns:

alphabet of this crypto component.

String getAlphabetAsStringKey

(

int

start

)

[protected]

Returns the alphabet as string key (starts from the specified position, e.g. 1 for a).

Parameters:

start

Position of the alphabet to start.

Returns:

alphabet as string key.

static char [] getDefaultAlphabet

(

)

[static]

Returns the default alphabet (a-z), lower case letters.

Returns:

default alphabet (a-z).

static char [] getDefaultAlphabetWithoutChar

(

char

ch

)

[static]

Returns the default alphabet (a-z) without the specified character. Needed e.g. to get 25 letters for a 5 * 5 matrix.

Parameters:

ch	character to ignore.

Returns:

default alphabet without the specified character.

Map<String, String> getReplacements

(

)

static char [] getTrithemianAlphabet

(

)

[static]

Returns the Trithemian alphabet: abcdefghiklmnopqrstuxyzw.

Returns:

Trithemian alphabet.

String replaceAll

(

String

toProcess

)

Replaces characters of the specified string by the replacements set in this.

Parameters:

toProcess

String to process.

Returns:

String with replaced characters.

void setAlphabet

(

char[]

alphabet

)

Sets the alphabet of this crypto component.

Parameters:

alphabet

to set.

static Map<String,String> trithemianAlphabetReplacements

(

)

[static]

Returns a map of default alphabet values and their replacements in the T. alphabet.

Returns:

Tritemian replacement map.

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Field Details

char [] alphabet [protected]

boolean deleteWhitespace [protected]

int intKey [protected]

Logger logger = Logger.getLogger(this.getClass()) [protected]

Map<String,String> replacementMap [protected]