org.mozilla.jss

Class CryptoManager

java.lang.Object

org.mozilla.jss.CryptoManager

All Implemented Interfaces:

TokenSupplier

public final class CryptoManager
extends java.lang.Object
implements TokenSupplier

This class is the starting poing for the crypto package. Use it to initialize the subsystem and to lookup certs, keys, and tokens. Initialization is done with static methods, and must be done before an instance can be created. All other operations are done with instance methods.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CryptoManager.CertificateUsage CertificateUsage options for validation
static class	CryptoManager.CertUsage note: this is obsolete in NSS CertUsage options for validation
static class	CryptoManager.InitializationValues The various options that can be used to initialize CryptoManager.
static class	CryptoManager.InvalidLengthException
static class	CryptoManager.NicknameConflictException
static class	CryptoManager.NotInitializedException
static class	CryptoManager.UserCertConflictException

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	JAR_DBM_VERSION
static java.lang.String	JAR_JDK_VERSION
static java.lang.String	JAR_JSS_VERSION
static java.lang.String	JAR_NSPR_VERSION
static java.lang.String	JAR_NSS_VERSION

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CryptoManager() Constructor, for internal use only.

Method Summary

Methods

Modifier and Type	Method and Description
X509Certificate[]	buildCertificateChain(X509Certificate leaf) Given a certificate, constructs its certificate chain.
void	configureOCSP(boolean ocspCheckingEnabled, java.lang.String ocspResponderURL, java.lang.String ocspResponderCertNickname) Enables OCSP, note when you Initialize JSS for the first time, for backwards compatibility, the initialize will enable OCSP if you previously set values.ocspCheckingEnabled and values.ocspResponderURL/values.ocspResponderCertNickname configureOCSP will allow changing of the the OCSPResponder at runtime
JSSSecureRandom	createPseudoRandomNumberGenerator() Retrieves a FIPS-140-2 validated random number generator.
byte[]	exportCertsToPKCS7(X509Certificate[] certs) Exports one or more certificates into a PKCS #7 certificate container.
X509Certificate	findCertByIssuerAndSerialNumber(byte[] derIssuer, INTEGER serialNumber) Looks up a certificate by issuer and serial number.
X509Certificate	findCertByNickname(java.lang.String nickname) Looks up a certificate given its nickname.
protected X509Certificate	findCertByNicknameNative(java.lang.String nickname)
X509Certificate[]	findCertsByNickname(java.lang.String nickname) Returns all certificates with the given nickname.
protected X509Certificate[]	findCertsByNicknameNative(java.lang.String nickname)
PrivateKey	findPrivKeyByCert(X509Certificate cert) Looks up the PrivateKey matching the given certificate.
protected PrivateKey	findPrivKeyByCertNative(X509Certificate cert)
boolean	FIPSEnabled() Determines whether FIPS-140-2 compliance is active.
java.util.Enumeration	getAllTokens() Retrieves all tokens.
X509Certificate[]	getCACerts() Retrieves all CA certificates in the trust database.
java.util.Enumeration	getExternalTokens() Retrieves all tokens except those built into NSS.
static CryptoManager	getInstance() Retrieve the single instance of CryptoManager.
CryptoToken	getInternalCryptoToken() Retrieves the internal cryptographic services token.
CryptoToken	getInternalKeyStorageToken() Retrieves the internal key storage token.
java.util.Enumeration	getModules() Retrieves all installed cryptographic modules.
PasswordCallback	getPasswordCallback() Returns the currently registered password callback.
X509Certificate[]	getPermCerts() Retrieves all certificates in the trust database.
JSSSecureRandom	getSecureRNG() Retrieves a FIPS-140-2 validated random number generator.
CryptoToken	getThreadToken() Returns the default token for the current thread.
CryptoToken	getTokenByName(java.lang.String name) Looks up the CryptoToken with the given name.
java.util.Enumeration	getTokensSupportingAlgorithm(Algorithm alg) Retrieves all tokens that support the given algorithm.
X509Certificate	importCACertPackage(byte[] certPackage) Imports a chain of certificates, none of which is a user certificate.
X509Certificate	importCertPackage(byte[] certPackage, java.lang.String nickname) Imports a chain of certificates.
InternalCertificate	importCertToPerm(X509Certificate cert, java.lang.String nickname) Imports a single certificate into the permanent certificate database.
void	importCRL(byte[] crl, java.lang.String url) Imports a CRL, and stores it into the cert7.db Validate CRL then import it to the dbase.
X509Certificate	importUserCACertPackage(byte[] certPackage, java.lang.String nickname) Imports a chain of certificates.
static void	initialize(CryptoManager.InitializationValues values) Initialize the security subsystem.
static void	initialize(java.lang.String configDir) Initialize the security subsystem.
boolean	isCertValid(byte[] certPackage, boolean checkSig, CryptoManager.CertUsage certUsage) Verify a certificate in memory.
int	isCertValid(java.lang.String nickname, boolean checkSig) Verify a certificate that exists in the given cert database, check if is valid and that we trust the issuer.
boolean	isCertValid(java.lang.String nickname, boolean checkSig, CryptoManager.CertificateUsage certificateUsage) Verify a certificate that exists in the given cert database, check if is valid and that we trust the issuer.
boolean	isCertValid(java.lang.String nickname, boolean checkSig, CryptoManager.CertUsage certUsage) note: this method calls obsolete function in NSS Verify a certificate that exists in the given cert database, check if is valid and that we trust the issuer.
void	OCSPCacheSettings(int ocsp_cache_size, int ocsp_min_cache_entry_duration, int ocsp_max_cache_entry_duration) change OCSP cache settings * @param ocsp_cache_size max cache entries * @param ocsp_min_cache_entry_duration minimum seconds to next fetch attempt * @param ocsp_max_cache_entry_duration maximum seconds to next fetch attempt
void	setOCSPTimeout(int ocsp_timeout) set OCSP timeout value * @param ocspTimeout OCSP timeout in seconds
void	setPasswordCallback(PasswordCallback pwcb) This function sets the global password callback.
void	setThreadToken(CryptoToken token) Sets the default token for the current thread.

Methods inherited from class java.lang.Object

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

Field Detail

JAR_JSS_VERSION

public static final java.lang.String JAR_JSS_VERSION

See Also:

Constant Field Values

JAR_JDK_VERSION

public static final java.lang.String JAR_JDK_VERSION

See Also:

Constant Field Values

JAR_NSS_VERSION

public static final java.lang.String JAR_NSS_VERSION

See Also:

Constant Field Values

JAR_DBM_VERSION

public static final java.lang.String JAR_DBM_VERSION

See Also:

Constant Field Values

JAR_NSPR_VERSION

public static final java.lang.String JAR_NSPR_VERSION

See Also:

Constant Field Values

Constructor Detail

CryptoManager

protected CryptoManager()

Constructor, for internal use only.

Method Detail

getInternalCryptoToken

public CryptoToken getInternalCryptoToken()

Retrieves the internal cryptographic services token. This is the token built into NSS that performs bulk cryptographic operations.

In FIPS mode, the internal cryptographic services token is the same as the internal key storage token.

Specified by:

getInternalCryptoToken in interface TokenSupplier

Returns:

The internal cryptographic services token.

getInternalKeyStorageToken

public CryptoToken getInternalKeyStorageToken()

Retrieves the internal key storage token. This is the token provided by NSS to store private keys. The keys stored in this token are stored in an encrypted key database.

In FIPS mode, the internal key storage token is the same as the internal cryptographic services token.

Returns:

The internal key storage token.

getTokenByName

public CryptoToken getTokenByName(java.lang.String name)
                           throws NoSuchTokenException

Looks up the CryptoToken with the given name. Searches all loaded cryptographic modules for the token.

Parameters:

name - The name of the token.

Throws:

org.mozilla.jss.crypto.NoSuchTokenException - If no token is found with the given name.

NoSuchTokenException

getTokensSupportingAlgorithm

public java.util.Enumeration getTokensSupportingAlgorithm(Algorithm alg)

Retrieves all tokens that support the given algorithm.

getAllTokens

public java.util.Enumeration getAllTokens()

Retrieves all tokens. This is an enumeration of all tokens on all modules.

Returns:

All tokens accessible from JSS. Each item of the enumeration is a CryptoToken

See Also:

CryptoToken

getExternalTokens

public java.util.Enumeration getExternalTokens()

Retrieves all tokens except those built into NSS. This excludes the internal token and the internal key storage token (which are one and the same in FIPS mode).

Returns:

All tokens accessible from JSS, except for the built-in internal tokens.

getModules

public java.util.Enumeration getModules()

Retrieves all installed cryptographic modules.

Returns:

An enumeration of all installed PKCS #11 modules. Each item in the enumeration is a PK11Module.

See Also:

PK11Module

getInstance

public static CryptoManager getInstance()
                                 throws CryptoManager.NotInitializedException

Retrieve the single instance of CryptoManager. This cannot be called before initialization.

Throws:

CryptoManager.NotInitializedException - If initialize(InitializationValues has not yet been called.

See Also:

initialize(CryptoManager.InitializationValues)

FIPSEnabled

public boolean FIPSEnabled()

Determines whether FIPS-140-2 compliance is active.

Returns:

true if the security library is in FIPS-140-2 compliant mode.

setPasswordCallback

public void setPasswordCallback(PasswordCallback pwcb)

This function sets the global password callback. It is not thread-safe to change this.

The callback may be NULL, in which case password callbacks will fail gracefully.

getPasswordCallback

public PasswordCallback getPasswordCallback()

Returns the currently registered password callback.

initialize

public static void initialize(java.lang.String configDir)
                       throws KeyDatabaseException,
                              CertDatabaseException,
                              AlreadyInitializedException,
                              java.security.GeneralSecurityException

Initialize the security subsystem. Opens the databases, loads all PKCS #11 modules, initializes the internal random number generator. The initialize methods that take arguments should be called only once, otherwise they will throw an exception. It is OK to call them after calling initialize().

Parameters:

configDir - The directory containing the security databases.

Throws:

org.mozilla.jss.util.KeyDatabaseException - Unable to open the key database, or it was currupted.

org.mozilla.jss.util.CertDatabaseException - Unable to open the certificate database, or it was currupted.

KeyDatabaseException

CertDatabaseException

AlreadyInitializedException

java.security.GeneralSecurityException

initialize

public static void initialize(CryptoManager.InitializationValues values)
                       throws KeyDatabaseException,
                              CertDatabaseException,
                              AlreadyInitializedException,
                              java.security.GeneralSecurityException

Initialize the security subsystem. Opens the databases, loads all PKCS #11 modules, initializes the internal random number generator. The initialize methods that take arguments should be called only once, otherwise they will throw an exception. It is OK to call them after calling initialize().

Parameters:

values - The options with which to initialize CryptoManager.

Throws:

org.mozilla.jss.util.KeyDatabaseException - Unable to open the key database, or it was currupted.

org.mozilla.jss.util.CertDatabaseException - Unable to open the certificate database, or it was currupted.

KeyDatabaseException

CertDatabaseException

AlreadyInitializedException

java.security.GeneralSecurityException

getCACerts

public X509Certificate[] getCACerts()

Retrieves all CA certificates in the trust database. This is a fairly expensive operation in that it involves traversing the entire certificate database.

Returns:

An array of all CA certificates stored permanently in the trust database.

getPermCerts

public X509Certificate[] getPermCerts()

Retrieves all certificates in the trust database. This is a fairly expensive operation in that it involves traversing the entire certificate database.

Returns:

An array of all certificates stored permanently in the trust database.

importCertPackage

public X509Certificate importCertPackage(byte[] certPackage,
                                java.lang.String nickname)
                                  throws java.security.cert.CertificateEncodingException,
                                         CryptoManager.NicknameConflictException,
                                         CryptoManager.UserCertConflictException,
                                         NoSuchItemOnTokenException,
                                         TokenException

Imports a chain of certificates. The leaf certificate may be a a user certificate, that is, a certificate that belongs to the current user and whose private key is available for use. If the leaf certificate is a user certificate, it is stored on the token that contains the corresponding private key, and is assigned the given nickname.

Parameters:

certPackage - An encoded certificate or certificate chain. Acceptable encodings are binary PKCS #7 SignedData objects and DER-encoded certificates, which may or may not be wrapped in a Base-64 encoding package surrounded by "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----".

nickname - The nickname for the user certificate. It must be unique. It is ignored if there is no user certificate.

Returns:

The leaf certificate from the chain.

Throws:

java.security.cert.CertificateEncodingException - If the package encoding was not recognized.

CertificateNicknameConflictException - If the leaf certificate is a user certificate, and another certificate already has the given nickname.

CryptoManager.UserCertConflictException - If the leaf certificate is a user certificate, but it has already been imported.

NoSuchItemOnTokenException - If the leaf certificate is a user certificate, but the matching private key cannot be found.

TokenException - If an error occurs importing a leaf certificate into a token.

CryptoManager.NicknameConflictException

importUserCACertPackage

public X509Certificate importUserCACertPackage(byte[] certPackage,
                                      java.lang.String nickname)
                                        throws java.security.cert.CertificateEncodingException,
                                               CryptoManager.NicknameConflictException,
                                               CryptoManager.UserCertConflictException,
                                               NoSuchItemOnTokenException,
                                               TokenException

Imports a chain of certificates. The leaf of the chain is a CA certificate AND a user certificate (this would only be called by a CA installing its own certificate).

Parameters:

certPackage - An encoded certificate or certificate chain. Acceptable encodings are binary PKCS #7 SignedData objects and DER-encoded certificates, which may or may not be wrapped in a Base-64 encoding package surrounded by "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----".

nickname - The nickname for the user certificate. It must be unique.

Returns:

The leaf certificate from the chain.

Throws:

java.security.cert.CertificateEncodingException - If the package encoding was not recognized.

CertificateNicknameConflictException - If the leaf certificate another certificate already has the given nickname.

CryptoManager.UserCertConflictException - If the leaf certificate has already been imported.

NoSuchItemOnTokenException - If the the private key matching the leaf certificate cannot be found.

TokenException - If an error occurs importing the leaf certificate into a token.

CryptoManager.NicknameConflictException

importCACertPackage

public X509Certificate importCACertPackage(byte[] certPackage)
                                    throws java.security.cert.CertificateEncodingException,
                                           TokenException

Imports a chain of certificates, none of which is a user certificate.

Parameters:

certPackage - An encoded certificate or certificate chain. Acceptable encodings are binary PKCS #7 SignedData objects and DER-encoded certificates, which may or may not be wrapped in a Base-64 encoding package surrounded by "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----".

Returns:

The leaf certificate from the chain.

Throws:

java.security.cert.CertificateEncodingException - If the package encoding was not recognized.

TokenException - If an error occurs importing a leaf certificate into a token.

importCertToPerm

public InternalCertificate importCertToPerm(X509Certificate cert,
                                   java.lang.String nickname)
                                     throws TokenException,
                                            InvalidNicknameException

Imports a single certificate into the permanent certificate database.

Parameters:

cert - the certificate you want to add

nickname - the nickname you want to refer to the certificate as (must not be null)

Throws:

TokenException

InvalidNicknameException

importCRL

public void importCRL(byte[] crl,
             java.lang.String url)
               throws CRLImportException,
                      TokenException

Imports a CRL, and stores it into the cert7.db Validate CRL then import it to the dbase. If there is already a CRL with the same CA in the dbase, it will be replaced if derCRL is more up to date.

Parameters:

crl - the DER-encoded CRL.

url - the URL where this CRL can be retrieved from (for future updates). [ note that CRLs are not retrieved automatically ]. Can be null

Throws:

CRLImportException - If the package encoding was not recognized.

TokenException

exportCertsToPKCS7

public byte[] exportCertsToPKCS7(X509Certificate[] certs)
                          throws java.security.cert.CertificateEncodingException

Exports one or more certificates into a PKCS #7 certificate container. This is just a SignedData object whose certificates field contains the given certificates but whose content field is empty.

Parameters:

certs - One or more certificates that should be exported into the PKCS #7 object. The leaf certificate should be the first in the chain. The output of buildCertificateChain would be appropriate here.

Returns:

A byte array containing a PKCS #7 SignedData object.

Throws:

java.security.cert.CertificateEncodingException - If the array is empty, or an error occurred encoding the certificates.

See Also:

buildCertificateChain(org.mozilla.jss.crypto.X509Certificate)

findCertByNickname

public X509Certificate findCertByNickname(java.lang.String nickname)
                                   throws ObjectNotFoundException,
                                          TokenException

Looks up a certificate given its nickname.

Parameters:

nickname - The nickname of the certificate to look for.

Returns:

The certificate matching this nickname, if one is found.

Throws:

ObjectNotFoundException - If no certificate could be found with the given nickname.

TokenException - If an error occurs in the security library.

findCertsByNickname

public X509Certificate[] findCertsByNickname(java.lang.String nickname)
                                      throws TokenException

Returns all certificates with the given nickname.

Parameters:

nickname - The nickname of the certificate to look for.

Returns:

The certificates matching this nickname. The array may be empty if no matching certs were found.

Throws:

TokenException - If an error occurs in the security library.

findCertByIssuerAndSerialNumber

public X509Certificate findCertByIssuerAndSerialNumber(byte[] derIssuer,
                                              INTEGER serialNumber)
                                                throws ObjectNotFoundException,
                                                       TokenException

Looks up a certificate by issuer and serial number. The internal database and all PKCS #11 modules are searched.

Parameters:

derIssuer - The DER encoding of the certificate issuer name. The issuer name has ASN.1 type Name, which is defined in X.501.

serialNumber - The certificate serial number.

Throws:

ObjectNotFoundException - If the certificate is not found in the internal certificate database or on any PKCS #11 token.

TokenException - If an error occurs in the security library.

findCertByNicknameNative

protected X509Certificate findCertByNicknameNative(java.lang.String nickname)
                                            throws ObjectNotFoundException,
                                                   TokenException

Throws:

ObjectNotFoundException

TokenException

findCertsByNicknameNative

protected X509Certificate[] findCertsByNicknameNative(java.lang.String nickname)
                                               throws TokenException

Throws:

TokenException

buildCertificateChain

public X509Certificate[] buildCertificateChain(X509Certificate leaf)
                                        throws java.security.cert.CertificateException,
                                               TokenException

Given a certificate, constructs its certificate chain. It may or may not chain up to a trusted root.

Parameters:

leaf - The certificate that is the starting point of the chain.

Returns:

An array of certificates, starting at the leaf and ending with the highest certificate on the chain that was found.

Throws:

java.security.cert.CertificateException - If the certificate is not recognized by the underlying provider.

TokenException

findPrivKeyByCert

public PrivateKey findPrivKeyByCert(X509Certificate cert)
                             throws ObjectNotFoundException,
                                    TokenException

Looks up the PrivateKey matching the given certificate.

Throws:

ObjectNotFoundException - If no private key can be found matching the given certificate.

TokenException - If an error occurs in the security library.

findPrivKeyByCertNative

protected PrivateKey findPrivKeyByCertNative(X509Certificate cert)
                                      throws ObjectNotFoundException,
                                             TokenException

Throws:

ObjectNotFoundException

TokenException

createPseudoRandomNumberGenerator

public JSSSecureRandom createPseudoRandomNumberGenerator()

Retrieves a FIPS-140-2 validated random number generator.

Returns:

A JSS SecureRandom implemented with FIPS-validated NSS.

getSecureRNG

public JSSSecureRandom getSecureRNG()

Retrieves a FIPS-140-2 validated random number generator.

Specified by:

getSecureRNG in interface TokenSupplier

Returns:

A JSS SecureRandom implemented with FIPS-validated NSS.

setThreadToken

public void setThreadToken(CryptoToken token)

Sets the default token for the current thread. This token will be used when JSS is called through the JCA interface, which has no means of specifying which token to use.

If no token is set, the InternalKeyStorageToken will be used. Setting this thread's token to null will also cause the InternalKeyStorageToken to be used.

Specified by:

setThreadToken in interface TokenSupplier

Parameters:

token - The token to use for crypto operations. Specifying null will cause the InternalKeyStorageToken to be used.

getThreadToken

public CryptoToken getThreadToken()

Returns the default token for the current thread. This token will be used when JSS is called through the JCA interface, which has no means of specifying which token to use.

If no token is set, the InternalKeyStorageToken will be used. Setting this thread's token to null will also cause the InternalKeyStorageToken to be used.

Specified by:

getThreadToken in interface TokenSupplier

Returns:

The default token for this thread. If it has not been specified, it will be the InternalKeyStorageToken.

isCertValid

public int isCertValid(java.lang.String nickname,
              boolean checkSig)
                throws ObjectNotFoundException,
                       InvalidNicknameException

Verify a certificate that exists in the given cert database, check if is valid and that we trust the issuer. Verify time against Now.

Parameters:

nickname - The nickname of the certificate to verify.

checkSig - verify the signature of the certificate

Returns:

currCertificateUsage which contains current usage bit map as defined in CertificateUsage

Throws:

InvalidNicknameException - If the nickname is null

ObjectNotFoundException - If no certificate could be found with the given nickname.

isCertValid

public boolean isCertValid(java.lang.String nickname,
                  boolean checkSig,
                  CryptoManager.CertificateUsage certificateUsage)
                    throws ObjectNotFoundException,
                           InvalidNicknameException

Verify a certificate that exists in the given cert database, check if is valid and that we trust the issuer. Verify time against Now.

Parameters:

nickname - The nickname of the certificate to verify.

checkSig - verify the signature of the certificate

certificateUsage - see certificateUsage defined to verify Certificate; to retrieve current certificate usage, call the isCertValid() above

Returns:

true for success; false otherwise

Throws:

InvalidNicknameException - If the nickname is null

ObjectNotFoundException - If no certificate could be found with the given nickname.

isCertValid

public boolean isCertValid(java.lang.String nickname,
                  boolean checkSig,
                  CryptoManager.CertUsage certUsage)
                    throws ObjectNotFoundException,
                           InvalidNicknameException

note: this method calls obsolete function in NSS Verify a certificate that exists in the given cert database, check if is valid and that we trust the issuer. Verify time against Now.

Parameters:

nickname - The nickname of the certificate to verify.

checkSig - verify the signature of the certificate

certUsage - see exposed certUsage defines to verify Certificate

Returns:

true for success; false otherwise

Throws:

InvalidNicknameException - If the nickname is null

ObjectNotFoundException - If no certificate could be found with the given nickname.

isCertValid

public boolean isCertValid(byte[] certPackage,
                  boolean checkSig,
                  CryptoManager.CertUsage certUsage)
                    throws TokenException,
                           java.security.cert.CertificateEncodingException

Verify a certificate in memory. Check if valid and that we trust the issuer. Verify time against Now.

Parameters:

certPackage - certificate in memory

checkSig - verify the signature of the certificate

certUsage - see exposed certUsage defines to verify Certificate

Returns:

true for success; false otherwise

Throws:

TokenException - unable to insert temporary certificate into database.

java.security.cert.CertificateEncodingException - If the package encoding was not recognized.

configureOCSP

public void configureOCSP(boolean ocspCheckingEnabled,
                 java.lang.String ocspResponderURL,
                 java.lang.String ocspResponderCertNickname)
                   throws java.security.GeneralSecurityException

Enables OCSP, note when you Initialize JSS for the first time, for backwards compatibility, the initialize will enable OCSP if you previously set values.ocspCheckingEnabled and values.ocspResponderURL/values.ocspResponderCertNickname configureOCSP will allow changing of the the OCSPResponder at runtime. * @param ocspChecking true or false to enable/disable OCSP * @param ocspResponderURL - url of the OCSP responder * @param ocspResponderCertNickname - the nickname of the OCSP signer certificate or the CA certificate found in the cert DB

Throws:

java.security.GeneralSecurityException

OCSPCacheSettings

public void OCSPCacheSettings(int ocsp_cache_size,
                     int ocsp_min_cache_entry_duration,
                     int ocsp_max_cache_entry_duration)
                       throws java.security.GeneralSecurityException

change OCSP cache settings * @param ocsp_cache_size max cache entries * @param ocsp_min_cache_entry_duration minimum seconds to next fetch attempt * @param ocsp_max_cache_entry_duration maximum seconds to next fetch attempt

Throws:

java.security.GeneralSecurityException

setOCSPTimeout

public void setOCSPTimeout(int ocsp_timeout)
                    throws java.security.GeneralSecurityException

set OCSP timeout value * @param ocspTimeout OCSP timeout in seconds

Throws:

java.security.GeneralSecurityException