demo.cms.envelopedData
Class RC2EnvelopedDataDemo

java.lang.Object
  demo.cms.envelopedData.RC2EnvelopedDataDemo

public class RC2EnvelopedDataDemo
extends java.lang.Object

This class demonstrates the EnvelopedDataStream/EncryptedContentInfoStream usages for the RC2 algorithm.

This demo compares the usage of class EnvelopedDataStream for encrypting the content using RC2 with automatic (transparent) key/parameter handling against explicit key/parameter/EncrypedContentInfoStream handling.

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

RC2 parameters are defined as:

• RC2_CBC: Variable-key-size block cipher; parameters as used by S/MIME: rc2ParamterVersion and IV; encoded as SEQUENCE:

                 RC2-CBC parameter ::=  SEQUENCE {
                   rc2ParameterVersion  INTEGER,
                   iv                   OCTET STRING (8)}
  
                 For the effective-key-bits of 40, 64, and 128, the
                  rc2ParameterVersion values are 160, 120, 58 respectively.
                

Note that the usage of RC2 is deprecated but used here for this demo since it requires a specific parameter handling.

Constructor Summary

RC2EnvelopedDataDemo()
Setup the demo certificate chains.

Method Summary

byte[]	createEncryptedContentInfoStream(byte[] message, iaik.asn1.structures.AlgorithmID contentEA, 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

RC2EnvelopedDataDemo

public RC2EnvelopedDataDemo()
                     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:

iaik.cms.CMSException - if the EnvelopedData object cannot be created

java.lang.Exception

createEncryptedContentInfoStream

public byte[] createEncryptedContentInfoStream(byte[] message,
                                               iaik.asn1.structures.AlgorithmID contentEA,
                                               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

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

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:

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

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