org.ssonet.util
Class CryptoTools

java.lang.Object
  |
  +--org.ssonet.util.CryptoTools

public class CryptoTools

extends java.lang.Object

Title: Cryptotools for SSONET Description: This class is a collection of helpfull Methods for handling cryptographic operations Copyright: Copyright (c) 2001 Company:

Field Summary

static boolean

debug

Constructor Summary

CryptoTools()

Method Summary

static java.security.cert.X509Certificate	createCertificate(java.security.PublicKey publicKey, java.security.PrivateKey signKey, java.security.cert.X509Certificate issuerCertificate, java.util.Date notBefore, java.util.Date notAfter, java.lang.String subject) Create a X509Certificate for a public key (only DSA-Certificates are allowed)
static java.security.KeyPair	createKeyPair(java.lang.String mechanismName, int keyLength) Create a keypair
static java.lang.String	getPrincipalElement(java.security.Principal p, java.lang.String commonSymbol) For X509Certificates: Get an element of the Name from IssuerDN or SubjectDN
static java.security.SecureRandom	getSecureRandom() Initializes the secureRandom object.
static java.security.cert.X509Certificate	readCertificate(java.lang.String certificateFileName) reads a certificate from file
static java.security.PrivateKey	readPrivateKeyPKCS8(java.lang.String privateKeyFileName, java.lang.String algName) reads a DER encoded private key from file
static java.security.PublicKey	readPublicKeyX509(java.lang.String publicKeyFileName, java.lang.String algName) reads a DER encoded public key from file
static void	testCertificate(java.security.cert.X509Certificate toTest, java.security.PublicKey publicKey) checks, whether a certificate is valid.
static void	writeCertificate(java.security.cert.X509Certificate certificate, java.lang.String fileName) Writes a X509 certificate to a file
static void	writePrivateKeyPKCS8(java.security.PrivateKey privateKey, java.lang.String fileName) Writes a Private Key to a file in PKCS8 encoding.
static void	writePublicKeyX509(java.security.PublicKey publicKey, java.lang.String fileName) Writes a Public Key to a file in X509 encoding.

Methods inherited from class java.lang.Object

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

Field Detail

debug

public static boolean debug

Constructor Detail

CryptoTools

public CryptoTools()

Method Detail

getSecureRandom

public static java.security.SecureRandom getSecureRandom()

Initializes the secureRandom object. If the System property "preload=testing" is set, securerandom is initialized with a java.Random. This can be used to circumvent the waiting for random buffer generation.

createKeyPair

public static java.security.KeyPair createKeyPair(java.lang.String mechanismName,
                                                  int keyLength)

Create a keypair

createCertificate

public static java.security.cert.X509Certificate createCertificate(java.security.PublicKey publicKey,
                                                                   java.security.PrivateKey signKey,
                                                                   java.security.cert.X509Certificate issuerCertificate,
                                                                   java.util.Date notBefore,
                                                                   java.util.Date notAfter,
                                                                   java.lang.String subject)
                                                            throws java.lang.Exception

Create a X509Certificate for a public key (only DSA-Certificates are allowed)

Parameters:

duration - Gültigkeitszeitraum in Tagen

subject - Distinguished Name of the subject of this certificate

testCertificate

public static void testCertificate(java.security.cert.X509Certificate toTest,
                                   java.security.PublicKey publicKey)
                            throws java.security.cert.CertificateException,
                                   java.security.NoSuchAlgorithmException,
                                   java.security.InvalidKeyException,
                                   java.security.SignatureException

checks, whether a certificate is valid. If the certificate is valid, the method just returns. Otherwise an exception according to the cause of invalidity of the certificate is thrown.

Parameters:

toTest - certificate to test

publicKey - certificate issuers public key

Throws:

CertificateException, - if the certificate is not valid

readCertificate

public static java.security.cert.X509Certificate readCertificate(java.lang.String certificateFileName)

reads a certificate from file

Parameters:

certificateFileName - certificate file name

Returns:

X509Certificate read certificate

writeCertificate

public static void writeCertificate(java.security.cert.X509Certificate certificate,
                                    java.lang.String fileName)
                             throws java.lang.Exception

Writes a X509 certificate to a file

Parameters:

certificate - the certificate

fileName - the filename of the file the certificate shall be written to

Throws:

java.lang.Exception - if an error occures while writing the certificate

readPrivateKeyPKCS8

public static java.security.PrivateKey readPrivateKeyPKCS8(java.lang.String privateKeyFileName,
                                                           java.lang.String algName)

reads a DER encoded private key from file

Parameters:

privateKeyFileName - private key file name

Returns:

PrivateKey read private key

writePrivateKeyPKCS8

public static void writePrivateKeyPKCS8(java.security.PrivateKey privateKey,
                                        java.lang.String fileName)
                                 throws java.lang.Exception

Writes a Private Key to a file in PKCS8 encoding.

Parameters:

privateKey - the private key

fileName - the filename of the file the key shall be written to

Throws:

java.lang.Exception - if the encoding is not PKCS8, and if an error occures during writing

readPublicKeyX509

public static java.security.PublicKey readPublicKeyX509(java.lang.String publicKeyFileName,
                                                        java.lang.String algName)

reads a DER encoded public key from file

Parameters:

publicKeyFileName - public key file name

Returns:

PublicKey read public key

writePublicKeyX509

public static void writePublicKeyX509(java.security.PublicKey publicKey,
                                      java.lang.String fileName)
                               throws java.lang.Exception

Writes a Public Key to a file in X509 encoding.

Parameters:

publicKey - the public key

fileName - the filename of the file the key shall be written to

Throws:

java.lang.Exception - if the encoding is not X509, and if an error occures during writing

getPrincipalElement

public static java.lang.String getPrincipalElement(java.security.Principal p,
                                                   java.lang.String commonSymbol)

For X509Certificates: Get an element of the Name from IssuerDN or SubjectDN