demo.cms.envelopedData

Class CAST128EnvelopedDataDemo

java.lang.Object

demo.cms.envelopedData.CAST128EnvelopedDataDemo

public class CAST128EnvelopedDataDemo
extends java.lang.Object

This class demonstrates the EnvelopedDataStream/EncryptedContentInfoStream usages for the CAST128 algorithm.

This demo compares the usage of class EnvelopedDataStream for encrypting the content using CAST128 with automatical (transparent) key/parameter handling against explicit key/parameter/EncrypedContentInfoStream handling.

All keys and certificates are read from a keystore created by the SetupCMSKeyStore program.

CAST parameters are defined as:

 Parameters ::=  SEQUENCE {
   iv         OCTET STRING DEFAULT 0,
   keyLength  INTEGER }
 

Constructor Summary

Constructors

Constructor and Description
CAST128EnvelopedDataDemo() Setup the demo certificate chains.

Method Summary

Modifier and Type	Method and Description
byte[]	createEncryptedContentInfoStream(byte[] message, iaik.asn1.structures.AlgorithmID cea, int keyLength) Creates a CMS EnvelopedDataStream message.
byte[]	createEnvelopedDataStream(byte[] message, iaik.asn1.structures.AlgorithmID contentEA, int keyLength) Creates a CMS EnvelopedDataStream message.
byte[]	getEncryptedContentInfoStream(byte[] encoding, java.security.PrivateKey privateKey, int recipientInfoIndex) Decrypts the encrypted content of the given EnvelopedData object for the specified recipient and returns the decrypted (= original) message.
byte[]	getEnvelopedDataStream(byte[] encoding, java.security.PrivateKey privateKey, int recipientInfoIndex) Decrypts the encrypted content of the given EnvelopedData object for the specified recipient and returns the decrypted (= original) message.
static void	main(java.lang.String[] argv) The main method.
void	start() Starts the test.

Methods inherited from class java.lang.Object

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

Constructor Detail

CAST128EnvelopedDataDemo

public CAST128EnvelopedDataDemo()
                         throws java.io.IOException

Setup the demo certificate chains. Keys and certificate are retrieved from the demo KeyStore.

Throws:

java.io.IOException - if an file read error occurs

Method Detail

createEnvelopedDataStream

public byte[] createEnvelopedDataStream(byte[] message,
                                        iaik.asn1.structures.AlgorithmID contentEA,
                                        int keyLength)
                                 throws java.lang.Exception

Creates a CMS EnvelopedDataStream message.

Parameters:

message - the message to be enveloped, as byte representation

contentEA - the content encryption algorithm

keyLength - the key length for the symmetric key

Returns:

the DER encoding of the EnvelopedData object just created

Throws:

java.lang.Exception - if the EnvelopedData object cannot be created

createEncryptedContentInfoStream

public byte[] createEncryptedContentInfoStream(byte[] message,
                                               iaik.asn1.structures.AlgorithmID cea,
                                               int keyLength)
                                        throws java.lang.Exception

Creates a CMS EnvelopedDataStream message.

Keys and parameters, and EncryptedContentInfoStream are created outside the EnvelopedDataStream class.

Parameters:

message - the message to be enveloped, as byte representation

cea - the content encryption algorithm

keyLength - the key length for the symmetric key

Returns:

the DER encoding of the EnvelopedData object just created

Throws:

java.lang.Exception - if the EnvelopedData object cannot be created

getEncryptedContentInfoStream

public byte[] getEncryptedContentInfoStream(byte[] encoding,
                                            java.security.PrivateKey privateKey,
                                            int recipientInfoIndex)
                                     throws java.lang.Exception

Decrypts the encrypted content of the given EnvelopedData object for the specified recipient and returns the decrypted (= original) message.

Decryption and cipher setup and EncryptedContentInfoStrean processing is performed outside class EnvelopedDataStream.

Parameters:

encoding - the EnvelopedData object as DER encoded byte array

privateKey - the private key to decrypt the message

recipientInfoIndex - the index into the RecipientInfo array to which the specified private key belongs

Returns:

the recovered message, as byte array

Throws:

iaik.cms.CMSException - if the message cannot be recovered

java.lang.Exception

getEnvelopedDataStream

public byte[] getEnvelopedDataStream(byte[] encoding,
                                     java.security.PrivateKey privateKey,
                                     int recipientInfoIndex)
                              throws java.lang.Exception

Decrypts the encrypted content of the given EnvelopedData object for the specified recipient and returns the decrypted (= original) message.

Parameters:

encoding - the EnvelopedData object as DER encoded byte array

privateKey - the private key to decrypt the message

recipientInfoIndex - the index into the RecipientInfo array to which the specified private key belongs

Returns:

the recovered message, as byte array

Throws:

java.lang.Exception - if the message cannot be recovered

start

public void start()

Starts the test.

main

public static void main(java.lang.String[] argv)
                 throws java.lang.Exception

The main method.

Throws:

java.lang.Exception - if some error occurs