examples
Class EncryptedDataAESDetachedExample

java.lang.Object
  examples.EncryptedDataAESDetachedExample

public class EncryptedDataAESDetachedExample
extends java.lang.Object

This example program creates an XML encoded value of ASN.1 type EncryptedData using the canonical XML Encoding Rules of ASN.1 (CXER). A value is encrypted using an AES Content Encryption Key (CEK). The encrypted content is "detached" and not present in the encoded message.

Plaintext is encrypted, then a value type EncryptedData, is encoded. The encoded CMS message is then decoded, and the decoded result's decrypted value is compared with the initial plaintext value to determine if the encryption-decryption and encoding-decoding processes worked as expected.

This example generates a fresh 128 bit AES key and uses this key.

ASN.1 type EncryptedData is defined in ISO 22895 and IETF RFC 3852:2004 as:

 EncryptedData ::= SEQUENCE {
   version               CMSVersion,
   encryptedContentInfo  EncryptedContentInfo,
   unprotectedAttrs      [1] IMPLICIT UnprotectedAttributes  OPTIONAL
 }
        
 EncryptedContentInfo ::= SEQUENCE {
    contentType                 ContentType,
    contentEncryptionAlgorithm  ContentEncryptionAlgorithmIdentifier,
    encryptedContent            [0] IMPLICIT EncryptedContent  OPTIONAL
 }
 
 ContentType ::= CONTENTS.&id({Contents})  -- OBJECT IDENTIFIER
 
 ContentEncryptionAlgorithmIdentifier ::= SEQUENCE {
    algorithm   ALGORITHM.&id({ContentEncryptionAlgorithms}),
    parameters  ALGORITHM.&Type({ContentEncryptionAlgorithms}{@algorithm})  OPTIONAL
 }
 
 ContentEncryptionAlgorithms ALGORITHM ::= {
 
    ...  -- Expect additional content encryption alogorithm objects --
 }
 
 EncryptedContent ::= OCTET STRING
 

Version:

1.00 - 2006/02/22

Author:

support@phillipgriffin.com

Constructor Summary

EncryptedDataAESDetachedExample()
Default constructor for EncryptedDataAESDetachedExample.

Method Summary

static void	main(java.lang.String[] args) Main allows this class to be run as an application from the command line.
void	showBinary() Executes the EncryptedData example and displays the results of DER and cryptographic processing on the console.
void	showMarkup() Executes the EncryptedData example and displays the results of XER and cryptographic processing on the console.

Methods inherited from class java.lang.Object

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

Constructor Detail

EncryptedDataAESDetachedExample

public EncryptedDataAESDetachedExample()

Default constructor for EncryptedDataAESDetachedExample.

Method Detail

showMarkup

public void showMarkup()
                throws java.lang.Exception

Executes the EncryptedData example and displays the results of XER and cryptographic processing on the console. The encrypted content is "detached" and not present in the message.

Throws:

java.lang.Exception

showBinary

public void showBinary()
                throws java.lang.Exception

Executes the EncryptedData example and displays the results of DER and cryptographic processing on the console.

Throws:

java.lang.Exception

main

public static void main(java.lang.String[] args)

Main allows this class to be run as an application from the command line. Note that any command line arguments are ignored.

Parameters:

args - command line arguments (not used).