org.refcodes.forwardsecrecy

Class ForwardSecrecyUtility

java.lang.Object

org.refcodes.forwardsecrecy.ForwardSecrecyUtility

public final class ForwardSecrecyUtility
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	CIPHER_LENGTH
static int	CIPHER_UID_LENGTH
static int	CIPHER_UID_TIMESTAMP_LENGTH
static int	MESSAGE_LENGTH

Method Summary

Modifier and Type	Method and Description
static String	createCipher() Default way on how to create a cipher.
static String	createCipherUid() Default way on how to create a cipher UID.
static String	createMessage() Default way on how to create a message which is to be signed in order to identify the owner of a public key.
static boolean	hasEncryptionPattern(String aText) Returns true in case the given text provided the characteristics of an encrypted text as of the cipher and cipher UID pattern. ------------------------------------------------------------------------- CAUTION: A plain text may have the same characteristics, an encrypted text must have these characteristics!
static String	toCipherUidPrefix(String aCipherUidWithEncryptedText) Expects a text with a prefixed cipher UID.
static String	toEncryptedTextBody(String aCipherUidWithEncryptedText) Expects a text with a prefixed cipher UID.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CIPHER_UID_TIMESTAMP_LENGTH

public static final int CIPHER_UID_TIMESTAMP_LENGTH

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Constant Field Values

CIPHER_UID_LENGTH

public static final int CIPHER_UID_LENGTH

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Constant Field Values

CIPHER_LENGTH

public static final int CIPHER_LENGTH

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Constant Field Values

MESSAGE_LENGTH

public static final int MESSAGE_LENGTH

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Constant Field Values

Method Detail

hasEncryptionPattern

public static boolean hasEncryptionPattern(String aText)

Returns true in case the given text provided the characteristics of an encrypted text as of the cipher and cipher UID pattern. ------------------------------------------------------------------------- CAUTION: A plain text may have the same characteristics, an encrypted text must have these characteristics! -------------------------------------------------------------------------

Parameters:

aText - The text to test whether it is encrypted.

Returns:

True in case the given text has the characteristics of an encrypted text

toCipherUidPrefix

public static String toCipherUidPrefix(String aCipherUidWithEncryptedText)

Expects a text with a prefixed cipher UID. Extracts the cipher UID with which the given text was encrypted.

Parameters:

aCipherUidWithEncryptedText - The encrypted text with the prefixed cipher UID

Returns:

The cipher UID or null if none cipher UID was found

toEncryptedTextBody

public static String toEncryptedTextBody(String aCipherUidWithEncryptedText)

Expects a text with a prefixed cipher UID. Extracts the encrypted Text without the prefixed cipher UID.

Parameters:

aCipherUidWithEncryptedText - The encrypted text with the prefixed cipher UID

Returns:

The encrypted text portion or null if none cipher UID was found (then we have an invalid format of the provided text)

createCipherUid

public static String createCipherUid()

Default way on how to create a cipher UID. In case the default way generated bad cipher UIDs, the default way's implementation is changed making it good again and all system using the default way. The timestamp is prepended so that regarding on the timestamp, encrypted texts can be easily selected, e.g. texts being encrypted with a cipher older than a given timestamp.

Returns:

A cipher UID created the default way.

createCipher

public static String createCipher()

Default way on how to create a cipher. In case the default way generated bad ciphers, the default way's implementation is changed making it secure again and all system using the default way.

Returns:

A cipher created the default way.

createMessage

public static String createMessage()

Default way on how to create a message which is to be signed in order to identify the owner of a public key.

Returns:

A message created the default way.