dist1.acb.common
Class Security

java.lang.Object
  dist1.acb.common.Security

public class Security

extends java.lang.Object

Security module

Version:

$Revision: 1.29 $

Author:

Mariana Marin

Method Summary

void	decrypt(java.lang.String inputFileName, java.lang.String outputFileName, byte[] key) Decrypts a file using triple-DES
byte[]	digest(java.lang.String string) Creates a a hash for a string
byte[]	encrypt(java.lang.String inputFileName, java.lang.String outputFileName) Generates a key and ecrypt using triple-DES a file with that key
static Security	getInstance() Get the only one instance
java.lang.String	getIssuedTo() Getter for property issuedTo.
javax.net.ServerSocketFactory	getServerSocketFactory() Obtain ServerSocketFactory
javax.net.SocketFactory	getSocketFactory() Obtain SocketFactory with certificate
void	init(java.io.InputStream keys, java.io.InputStream cert, java.io.InputStream generatorAndPrime) Initializes the Security obect.
void	init(java.lang.String keysFileName, java.lang.String certFileName, java.lang.String generatorAndPrimeFileName) Initializes the Security obect.
boolean	zkCheckUser(java.math.BigInteger r, java.math.BigInteger h, java.math.BigInteger s, java.math.BigInteger y) Ckecks if the user knows the secret
java.math.BigInteger	zkCreateCommitment(java.math.BigInteger k) Creates commitment r is g^k (mod q)
java.math.BigInteger	zkCreatePublicKey(java.lang.String password) Generates the public key for the user
java.math.BigInteger	zkCreateSignature(java.math.BigInteger k, java.math.BigInteger h, java.lang.String password) Creates signature for a password s = k+hx
java.math.BigInteger	zkRandom1024() Generates a secure random number

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static Security getInstance()

Get the only one instance

Returns:

The instance

getIssuedTo

public java.lang.String getIssuedTo()

Getter for property issuedTo.

Returns:

Value of property issuedTo.

getServerSocketFactory

public javax.net.ServerSocketFactory getServerSocketFactory()

Obtain ServerSocketFactory

Returns:

serverFactory

getSocketFactory

public javax.net.SocketFactory getSocketFactory()

Obtain SocketFactory with certificate

Returns:

clientFactory

decrypt

public void decrypt(java.lang.String inputFileName,
                    java.lang.String outputFileName,
                    byte[] key)
             throws java.lang.Exception

Decrypts a file using triple-DES

Parameters:

inputFileName - the name of the file which will be decrypted

outputFileName - the file reluted from decryption

key - the key

Throws:

java.lang.Exception - if the specified algorithm is not available in the default provider package or any of the other provider packages that were searched

digest

public byte[] digest(java.lang.String string)

Creates a a hash for a string

Parameters:

string -

Returns:

hash

encrypt

public byte[] encrypt(java.lang.String inputFileName,
                      java.lang.String outputFileName)
               throws java.lang.Exception

Generates a key and ecrypt using triple-DES a file with that key

Parameters:

inputFileName - file to be encrypted

outputFileName - the encrypted file

Returns:

key

Throws:

java.lang.Exception - if the specified algorithm is not available in the default provider package or any of the other provider packages that were searched

init

public void init(java.lang.String keysFileName,
                 java.lang.String certFileName,
                 java.lang.String generatorAndPrimeFileName)
          throws java.lang.Exception

Initializes the Security obect. Must be called once after receiving the instance of the object.

Parameters:

keysFileName - from where the storeKey is loaded

certFileName - from where the storeCert is loaded

generatorAndPrimeFileName - from where prime and corresponded geterator (for Zero knowledge) is loaded

Throws:

java.lang.Exception - if something wrong

init

public void init(java.io.InputStream keys,
                 java.io.InputStream cert,
                 java.io.InputStream generatorAndPrime)
          throws java.lang.Exception

Initializes the Security obect. Must be called once after receiving the instance of the object.

Parameters:

keys - from where the storeKey is loaded

cert - from where the storeCert is loaded

generatorAndPrime - from where prime and corresponded geterator is loaded (for Zero Knowledge algorithm)

Throws:

java.lang.Exception - if something wrong

java.lang.RuntimeException - if something wrong

zkCheckUser

public boolean zkCheckUser(java.math.BigInteger r,
                           java.math.BigInteger h,
                           java.math.BigInteger s,
                           java.math.BigInteger y)

Ckecks if the user knows the secret

Parameters:

r - the commitment

h - the nonce (a secure random number generate by the server)

s - the signature of the user

y - the public key of the user

Returns:

if the check is successfull.If the server believes that the user knows the password.

zkCreateCommitment

public java.math.BigInteger zkCreateCommitment(java.math.BigInteger k)

Creates commitment r is g^k (mod q)

Parameters:

k - the secure random number generated by the user

Returns:

r the commitment

zkCreatePublicKey

public java.math.BigInteger zkCreatePublicKey(java.lang.String password)

Generates the public key for the user

Parameters:

password - the password of the user

Returns:

y user's public key

zkCreateSignature

public java.math.BigInteger zkCreateSignature(java.math.BigInteger k,
                                              java.math.BigInteger h,
                                              java.lang.String password)

Creates signature for a password s = k+hx

Parameters:

k - a secure random number generate by the user

h - a secure random number generate by the server

password - user's password

Returns:

s the signature

zkRandom1024

public java.math.BigInteger zkRandom1024()

Generates a secure random number

Returns:

randBigInt