EncryptedDataStream ("Entrust Authority Security Toolkit for the Java Platform")

java.lang.Object
- iaik.cms.EncryptedDataStream

All Implemented Interfaces:

ContentStream, EOFListener, java.util.EventListener

Direct Known Subclasses:

EncryptedData
```
public class EncryptedDataStream
extends java.lang.Object
implements ContentStream, EOFListener
```
This class represents the stream-supporting implementation of the CMS EncryptedData type.
Each CMS content type is associated with a specific object identifier, derived from:
```
 pkcs-7 OBJECT IDENTIFIER ::=
   { iso(1) member-body(2) US(840) rsadsi(113549)
       pkcs(1) 7 }
 
```
The object identifier for the EncryptedData content type is defined as:
encryptedData OBJECT IDENTIFIER ::= { pkcs-7 6 }
which corresponds to the OID string "1.2.840.1.113549.1.7.6".
The CMS Cryptographic Message Syntax (RFC 2630) specifies the EncryptedData content type for providing a syntax for building encrypted contents. The encrypted-data content type consists of encrypted content of any type:
```
 EncryptedData ::= SEQUENCE {
    version CMSVersion,
    encryptedContentInfo EncryptedContentInfo 
    unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }
 
```
The encryptedContentInfo field specifies the type of the content being encrypted, the content-encryption algorithm used for encrypting the content, and the result of the content encryption. If the encrypted content value is not present in the encryptedContent field, it has to be supplied by other means:
```
 EncryptedContentInfo ::= SEQUENCE {
   contentType                 ContentType,
   contentEncryptionAlgorithm  ContentEncryptionAlgorithmIdentifier,
   encryptedContent            [0] IMPLICIT EncryptedContent OPTIONAL }
 

 EncryptedContent ::= OCTET STRING
 
```
The key that is used for encrypting the content is not included in the EncryptedData structure, it is assumed to be managed by other means.
If unprotected attributes are present, the version number is 2; otherwise 0:
```
 UnprotectedAttributes ::= SET SIZE (1..MAX) OF Attribute
 
```
When creating a new EncryptedDataStream instance the encrypted content has to be supplied as EncryptedContentInfoStream object.
Example:
```
 //create a EncryptedContentInfoStream for the data to be encrypted, supplied from an input stream:
 InputStream dataStream = ...;
 EncryptedContentInfoStream eci = new EncryptedContentInfoStream(ObjectID.cms_data, dataStream);
 //generate secret key and set up the cipher for encryption:
 SecretKey key = eci.setupCipher(AlgorithmID.des_EDE3_CBC);
 //create an EncryptedDataStream for the EncryptedContentInfoStream:
 EncryptedDataStream encrypted_data = new EncryptedDataStream(eci);
 //DER encode the EncryptedDataStream structure and write the encoding to an
 //output stream:
 OutputStream encoded_stream = ...;
 int blockSize = ...;
 encrypted_data.writeTo(encoded_stream, blockSize);
 
```
If a positive blocksize is specified, the encrypted content of the inherent EncryptedContentInfoStream will be encoded as indefinite primitive octet string instead of using the default primitive definite encoding scheme:
```
 0x24 0x80
           0x04 <blocksize> <first encrypted content block>
           0x04 <blocksize> <second encrypted content block>
           0x04 <blocksize> <third encrypted content block>
                ...
 0x00 0x00
 
```
instead of:
```
 0x04 <length> <encrypted content>
 
```
The indefinte constrcuted encoding scheme may be preferable for properly handling large amounts of data, or/and when intending to be compatible to the encoding practice of some particular application (for instance some versions of Netscape Navigator).
Decrypting goes the reverse way: From the DER encoded encryptedData a new EncryptedDataStream is created and parsed for the inherent EncryptedContentInfoStream. From the EncryptedContentInfoStream the encrypted content is obtained and decrypted using the same secret key:
```
 EncryptedDataStream encryptedData = new EncryptedDataStream(encoded_stream);
 EncryptedContentInfoStream eci =  (EncryptedContentInfoStream)encryptedData.getEncryptedContentInfo();
 //setup the cipher for decryption using the right secret key:
 eci.setupCipher(key);
 //get and read the data thereby actually performing the decryption
 InputStream data_is = eci.getInputStream();
 byte[] buf = new byte[1024];
 int r;
 while ((r = data_is.read(buf)) > 0) {
   // do something useful
 }
 
```
This class additonally supports specific constructors and methods allowing to easily use the EncryptedData content type for password based encrypting data -- the intended usage of CMS EncryptedData. Please remark that the following proceeding only may be used when doing a password based encryption. In all other situations you have to follow the way described above. However, you also may create your own EncryptedContentInfoStream even when doing a PBE encryption.
If you want to use PBE encryption but not creating an EncryptedContentInfoStream by yourself you first have to supply the data to be read from an inputstream, subsequently setup the cipher for PBE-encryption and finally call a writeTo method for encoding the EncryptedData object to a stream:
1. Use the EncryptedDataStream(InputStream is, int blockSize) constructor for creating a new EncryptedDataStream object and supplying the data to be encrypted from an inputstream. You optionally may define a particular blockSize value for splitting the encoding of the encrypted content:
```
     //the data to be encrypted supplied from an input stream:
     InputStream dataStream = ...;
     // the block size:
     int blockSize = ...;
     EncryptedDataStream encrypted_data = new EncryptedDataStream(dataStream, blockSize);
     
```
2. Setup the cipher for encryption by calling method setupCipher(AlgorithmID contentEA, char[] password) thereby specifying the PBE-algorithm to be used and the password, e.g.:
```
     AlgorithmID pbeAlgorithm = AlgorithmID.pbeWithSHAAnd3_KeyTripleDES_CBC;
     char[] password = ...;
     encrypted_data.setupCipher(pbeAlgorithm, password);
     
```
3. Use a proper writeTo method for BER encoding the EncryptedData object and writing it to an output stream. If not yet done you optionally may specify a particular block size for splitting the encoding of encrypted content.
```
     int blockSize = ...;
     OutputStream encoded_stream = ...;
     encrypted_data.writeTo(encoded_stream, blockSize);
     
```
  respectively
```
     encryptped_data.writeTo(encoded_stream);
     
```
  It is recommended to use a positive block size value, because it is the intended purpose of this stream-supporting EncryptedData implementation to handle large amounts of data. When no block size is specified whole the encrypted content is encoded as primitive definite octet string, which advantageously may be done when using the non-stream supporting EncryptedData implementation. When a positve block size is specified for encoding the EncryptedData to a stream, the encrypted content is BER encoded as indefinite constructed octet string being composed of a series of definite primitive encoded octet strings of blockSize length.
For parsing the EncryptedData object and recovering the original content, first use the EncryptedDataStream(InputStream is) constructor to parse the internal structure. Before reading the recovered content by means of the getInputStream method, the cipher has to be initialized for decryption with the password by calling the setupCipher(char[] password) method:
1. Create an EncryptedData structure from the input stream supplying the BER encoded EncryptedData:
```
     InputStream encoded_stream = ...;
     EncryptedDataStream encrypted_data = new EncryptedData(encoded_stream);
     
```
2. Get information about the inherent EncryptedContentInfo:
```
     EncryptedContentInfoStream eci = encrypted_data.getEncryptedContentInfo();
     System.out.println("Content type: "+eci.getContentType().getName());
     System.out.println("Content encryption algorithm: "+eci.getContentEncryptionAlgorithm().getName());
     
```
3. Specify the passord for initializing the cipher for encrypted-content decryption:
```
     char[] password = ...;
     encrypted_data.setupCipher(password);
     
```
  Unlike the non-stream supporting EncryptedData class where the encrypted-content decryption already is performed inside the setupCipher method, the cipher will be only initialized for decryption in this class. The encrypted-content decryption actually is done during reading the data obtained by calling the getInputStream method. So don´t call getInputStream before setting up the cipher!
4. Get and read the recovered content:
```
     InputStream data_is = encrypted_data.getInputStream();
     byte[] buf = new byte[1024];
     int r;
     while ((r = data_is.read(buf)) > 0) {
        // do something useful
     }
     
```
See Also:
EncryptedContentInfoStream

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`blockSize_` The block size for block oriented stream encoding.
`protected EncryptedContentInfoStream`	`encryptedContentInfo_` The inherent encrypted content info.
`protected DerInputStream`	`m_encryptedData` An `InputStream` holding the enveloped data.
`protected SecurityProvider`	`securityProvider_` The SecurityProvider responsible for cryptographic operations.
`protected Attribute[]`	`unprotectedAttrs_` Optional unprotected attributes.
`protected int`	`version_` The CMS version number.

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`EncryptedDataStream()` Default constructor for dynamic object creation in ContentInfoStream.
	`EncryptedDataStream(EncryptedContentInfoStream encryptedContentInfo)` Creates a CMS EncryptedDataStream from an EncryptedContentInfoStream.
	`EncryptedDataStream(java.io.InputStream is)` Creates a new EncryptedDataStream where the BER encoded data is read from the given InputStream.
	`EncryptedDataStream(java.io.InputStream is, int blockSize)` Creates a new CMS EncryptedDataStream object where the content to be encrypted is read from the supplied InputStream.
	`EncryptedDataStream(ObjectID contentType, java.io.InputStream is, int blockSize)` Creates a new CMS EncryptedDataStream object where the content to be encrypted is read from the supplied InputStream.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`decode(java.io.InputStream is)` Reads and decodes an encoded EncryptedDataStream from an input stream.
`int`	`getBlockSize()` Gets the block size defining the length of each definite primitive encoded octet string component.
`ObjectID`	`getContentType()` Returns the content type this class implements.
`EncryptedContentInfoStream`	`getEncryptedContentInfo()` Returns the encrypted content info of this `EncryptedDataStream` object.
`java.io.InputStream`	`getInputStream()` Returns an InputStream from where the decrypted data can be read.
`Attribute`	`getUnprotectedAttribute(ObjectID oid)` Returns the first unprotected attribute matching to the given ObjectID, if included in this EncryptedData object.
`Attribute[]`	`getUnprotectedAttributes()` Gets the unprotected attributes included in this EnvelopedData.
`int`	`getVersion()` Returns the syntax version number.
`void`	`notifyEOF()` This method implements the EOFListener interface to preform the final stage of decoding, once the 'encryptedContentInfo' has been completely decoded.
`void`	`setBlockSize(int blockSize)` Sets the block size for defining the length of each definite primitive encoded octet string component.
`void`	`setUnprotectedAttributes(Attribute[] attributes)` Sets a set of (unprotected) attributes.
`void`	`setupCipher(AlgorithmID contentEA, char[] password)` Setups the cipher for PBE-encrypting the content.
`void`	`setupCipher(AlgorithmID contentEA, char[] password, int iterationCount)` Setups the cipher for PBE-encrypting the content.
`void`	`setupCipher(char[] password)` Uses the given password to setup the cipher for decrypting the content.
`ASN1Object`	`toASN1Object()` Returns this CMS EnvelopedDataStream as ASN1Object.
`protected ASN1Object`	`toASN1Object(int blockSize)` Returns this CMS `EncryptedData` as ASN1Object.
`java.lang.String`	`toString()` Returns a string giving some information about this `EncryptedDataStream` object.
`java.lang.String`	`toString(boolean detailed)` Returns a string giving some - if requested - detailed information about this `EncryptedDataStream` object.
`void`	`writeTo(java.io.OutputStream os)` BER encodes and writes this EnvelopedData to the supplied output stream.
`void`	`writeTo(java.io.OutputStream os, int blockSize)` Writes this EncryptedData encoded to the supplied output stream.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - version_
```
protected int version_
```
    The CMS version number.
  - blockSize_
```
protected int blockSize_
```
    The block size for block oriented stream encoding.
  - encryptedContentInfo_
```
protected EncryptedContentInfoStream encryptedContentInfo_
```
    The inherent encrypted content info.
  - unprotectedAttrs_
```
protected Attribute[] unprotectedAttrs_
```
    Optional unprotected attributes.
  - securityProvider_
```
protected SecurityProvider securityProvider_
```
    The SecurityProvider responsible for cryptographic operations.
  - m_encryptedData
```
protected DerInputStream m_encryptedData
```
    An InputStream holding the enveloped data.
- Constructor Detail
  - EncryptedDataStream
```
protected EncryptedDataStream()
```
    Default constructor for dynamic object creation in ContentInfoStream.
  - EncryptedDataStream
```
public EncryptedDataStream(EncryptedContentInfoStream encryptedContentInfo)
```
    Creates a CMS EncryptedDataStream from an EncryptedContentInfoStream.
    
    Parameters:
    encryptedContentInfo - the already created encrypted content info
  - EncryptedDataStream
```
public EncryptedDataStream(java.io.InputStream is,
                   int blockSize)
```
    Creates a new CMS EncryptedDataStream object where the content to be encrypted is read from the supplied InputStream. The content type is set to CMS Data.
    This constructor only shall be used when intending to PBE encrypt the data by subsequently calling method setupCipher thereby supplying PBE-algorithm and password to be used.
    This constructor shall not be used in situations where the desired content encryption algorithm is not a PBE algorithm. In such cases the EncryptedDataStream(EncryptedContentInfoStream) constructor shall be used to be supplied with a precomputed EncryptedContentInfo. Consult the EncryptedContentInfoStream class documentation for more information about EncryptedContentInfo handling.
    
    Parameters:
    is - the InputStream containing the data to encrypt
    blockSize - for defining the encoding scheme and setting the octet string component length, if positive
  - EncryptedDataStream
```
public EncryptedDataStream(ObjectID contentType,
                   java.io.InputStream is,
                   int blockSize)
```
    Creates a new CMS EncryptedDataStream object where the content to be encrypted is read from the supplied InputStream. The content type is set to CMS Data.
    This constructor only shall be used when intending to PBE encrypt the data by subsequently calling method setupCipher thereby supplying PBE-algorithm and password to be used.
    This constructor shall not be used in situations where the desired content encryption algorithm is not a PBE algorithm. In such cases the EncryptedDataStream(EncryptedContentInfoStream) constructor shall be used to be supplied with a precomputed EncryptedContentInfo. Consult the EncryptedContentInfoStream class documentation for more information about EncryptedContentInfo handling.
    
    Parameters:
    contentType - the content type of the data to be encrypted
    is - the InputStream containing the data to encrypt
    blockSize - for defining the encoding scheme and setting the octet string component length, if positive
  - EncryptedDataStream
```
public EncryptedDataStream(java.io.InputStream is)
                    throws java.io.IOException,
                           CMSParsingException
```
    Creates a new EncryptedDataStream where the BER encoded data is read from the given InputStream.
    
    Parameters:
    is - the InputStream holding a BER encoded EncryptedDataStream object
    
    Throws:
    
    java.io.IOException - if an I/O error occurs during reading from the InputStream
    
    CMSParsingException - if an error occurs while parsing the object
- Method Detail
  - setBlockSize
```
public void setBlockSize(int blockSize)
```
    Sets the block size for defining the length of each definite primitive encoded octet string component. If the value of blockSize is smaller or equal to zero the whole data is encoded as definite primitive octet string.
    
    Specified by:
    
    setBlockSize in interface ContentStream
    
    Parameters:
    blockSize - for defining the encoding scheme and setting the octet string component length, if positive
  - getBlockSize
```
public int getBlockSize()
```
    Gets the block size defining the length of each definite primitive encoded octet string component. If the value of blockSize is smaller or equal to zero the whole data is encoded as definite primitive octet string.
    
    Specified by:
    
    getBlockSize in interface ContentStream
    
    Returns:
    blockSize defining the encoding scheme and setting the octet string component length, if positive
  - decode
```
public void decode(java.io.InputStream is)
            throws java.io.IOException,
                   CMSParsingException
```
    Reads and decodes an encoded EncryptedDataStream from an input stream.
    
    Specified by:
    
    decode in interface ContentStream
    
    Parameters:
    is - the InputStream supplying an encoded EncryptedData object
    
    Throws:
    
    java.io.IOException - if an I/O error occurs during reading from the InputStream
    
    CMSParsingException - if an error occurs while parsing the object
  - setupCipher
```
public void setupCipher(AlgorithmID contentEA,
               char[] password)
                 throws java.security.NoSuchAlgorithmException,
                        java.security.InvalidKeyException
```
    Setups the cipher for PBE-encrypting the content. This method only may be used to setup the cipher for PBE-encrypting the content that has been supplied when creating the EncryptedDataStream object by means of the EncryptedDataStream(InputStream is, int blockSize) constructor. The content encryption actually is performed during the encoding when writing this EncyrptedData to a stream by calling the writeTo method. So it is important to setup the cipher before writing to the stream!
    
    Parameters:
    contentEA - the PBE-algorithm to be used
    password - the password
    
    Throws:
    
    java.security.NoSuchAlgorithmException - if the algorithm is not supported
    
    java.security.InvalidKeyException - if the key cannot be derived from the password
  - setupCipher
```
public void setupCipher(AlgorithmID contentEA,
               char[] password,
               int iterationCount)
                 throws java.security.NoSuchAlgorithmException,
                        java.security.InvalidKeyException
```
    Setups the cipher for PBE-encrypting the content. This method only may be used to setup the cipher for PBE-encrypting the content that has been supplied when creating the EncryptedDataStream object by means of the EncryptedDataStream(InputStream is, int blockSize) constructor. The content encryption actually is performed during the encoding when writing this EncyrptedData to a stream by calling the writeTo method. So it is important to setup the cipher before writing to the stream!
    This method has an additional parameter: iterationCount. When deriving the symmetric key and the IV a hash is calculated iterationCount times on the password and on the salt thus increasing the cost for breaking the cipher using brute force methods.
    
    Parameters:
    contentEA - the PBE-algorithm to be used
    password - the password
    iterationCount - the iteration count for key derivation
    
    Throws:
    
    java.security.NoSuchAlgorithmException - if the algorithm is not supported
    
    java.security.InvalidKeyException - if the key cannot be derived from the password
  - setupCipher
```
public void setupCipher(char[] password)
                 throws java.security.NoSuchAlgorithmException,
                        java.security.InvalidAlgorithmParameterException,
                        java.security.spec.InvalidParameterSpecException,
                        java.security.InvalidKeyException
```
    Uses the given password to setup the cipher for decrypting the content.
    Unlike the non-stream supporting EncryptedData class where the encrypted-content decryption already is performed inside the setupCipher method, the cipher will be only initialized for decrypting in this class. The encrypted-content decryption actually is done during reading the data obtained by calling the getInputStream method. So don´t call getInputStream before setting up the cipher!
    Attention! This method only can be used when the content has been encrypted using a PBE cipher. Otherwise the setupCipher(Key key, AlgorithmParameterSpec) method of the EncryptedContentInfoStream class has to be used to setup the cipher for content decryption.
    
    Parameters:
    password - the password
    
    Throws:
    
    java.security.NoSuchAlgorithmException - if the algorithm is not supported
    
    java.security.InvalidKeyException - if the key cannot be derived from the password
    
    java.security.InvalidAlgorithmParameterException - if the paramters cannot be retrieved from the algorithm ID
    
    java.security.spec.InvalidParameterSpecException - if the paramters cannot be set up
  - setUnprotectedAttributes
```
public void setUnprotectedAttributes(Attribute[] attributes)
```
    Sets a set of (unprotected) attributes.
    
    Parameters:
    attributes - the unprotected attributes to be set
  - getContentType
```
public ObjectID getContentType()
```
    Returns the content type this class implements.
    
    Specified by:
    
    getContentType in interface ContentStream
    
    Returns:
    ObjectID.cms_encryptedData
  - getVersion
```
public int getVersion()
```
    Returns the syntax version number.
    
    Returns:
    the syntax version number
  - getUnprotectedAttributes
```
public Attribute[] getUnprotectedAttributes()
```
    Gets the unprotected attributes included in this EnvelopedData.
    
    Returns:
    the unprotected attributes; if included
  - getUnprotectedAttribute
```
public Attribute getUnprotectedAttribute(ObjectID oid)
```
    Returns the first unprotected attribute matching to the given ObjectID, if included in this EncryptedData object.
    
    Returns:
    the first unprotected attribute belonging to the given ObjectID or null if there is no attribute for the given OID.
  - getInputStream
```
public java.io.InputStream getInputStream()
```
    Returns an InputStream from where the decrypted data can be read. Attention! The stream only may be read once.
    When having created a new EncryptedDataStream object to be encoded to a stream, this method should not be utilized at all, since the stream automatically will be read during performing the encoding which is done when calling a writeTo method).
    When having decoded and parsed a received EnvelopedDataStream object comimg from some stream, this method may be used for obtaining the raw (decrypted) data after having setup the cipher (if PBE-encryption is used).
    
    Returns:
    an InputStream for reading the decrypted data
  - toASN1Object
```
public ASN1Object toASN1Object()
                        throws CMSException
```
    Returns this CMS EnvelopedDataStream as ASN1Object.
    
    Specified by:
    
    toASN1Object in interface ContentStream
    
    Returns:
    this EnvelopedData as ASN1Object.
    
    Throws:
    
    CMSException - if the ASN1Object could not be created
  - toASN1Object
```
protected ASN1Object toASN1Object(int blockSize)
                           throws CMSException
```
    Returns this CMS EncryptedData as ASN1Object.
    
    Parameters:
    blockSize - the block size defining the encoding scheme - and specifying the length of each primitive encoded octet string component, if positive
    
    Returns:
    this EncryptedData as ASN1Object
    
    Throws:
    
    CMSException - if the ASN1Object could not be created
  - writeTo
```
public void writeTo(java.io.OutputStream os)
             throws java.io.IOException
```
    BER encodes and writes this EnvelopedData to the supplied output stream.
    
    Parameters:
    os - the output stream to which this EnvelopedData shall be written
    
    Throws:
    
    java.io.IOException
  - writeTo
```
public void writeTo(java.io.OutputStream os,
           int blockSize)
             throws java.io.IOException
```
    Writes this EncryptedData encoded to the supplied output stream. If a positive blocksize is specified, the encrypted content of the inherent EncryptedContentInfoStream will be encoded as indefinite primitive octet string instead of using the default primitive definite encoding scheme:
```
 0x24 0x80
           0x04 <blocksize> <first encrypted content block>
           0x04 <blocksize> <second encrypted content block>
           0x04 <blocksize> <third encrypted content block>
                ...
 0x00 0x00
 
```
    instead of:
```
 0x04 <length> <encrypted content>
 
```
    The indefinte constrcuted encoding scheme may be preferable for properly handling large amounts of data, or/and when intending to be compatible to the encoding practice of some particular application (for instance some versions of Netscape Navigator).
    Parameters:
    os - the output stream to which this SignedData shall be written
    blockSize - the block size defining the encoding scheme - and specifying the length of each primitive encoded octet string component, if positive
    
    Throws:
    
    java.io.IOException - if an error occurs during writing the object
  - getEncryptedContentInfo
```
public EncryptedContentInfoStream getEncryptedContentInfo()
```
    Returns the encrypted content info of this EncryptedDataStream object.
    
    Returns:
    the inherent EncryptedContentInfoStream
  - toString
```
public java.lang.String toString()
```
    Returns a string giving some information about this EncryptedDataStream object.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    the string representation
  - toString
```
public java.lang.String toString(boolean detailed)
```
    Returns a string giving some - if requested - detailed information about this EncryptedDataStream object.
    
    Specified by:
    
    toString in interface ContentStream
    
    Parameters:
    detailed - - whether or not to give detailed information
    
    Returns:
    the string representation
  - notifyEOF
```
public void notifyEOF()
               throws java.io.IOException
```
    This method implements the EOFListener interface to preform the final stage of decoding, once the 'encryptedContentInfo' has been completely decoded.
    Since the unprotected attributes are located at the end of the EncryptedData structure, they can only be accessed after the data stream (encrypted content) has been completely read. For that reason, after beginning the decode operation (after calling decode(InputStream)), but before reading the data stream (reading input stream getInputStream), only the version, originator information, and recipient information can be parsed. Since the decrypted data is supplied from an input stream, an iaik.utils.NotifyEOFInputStream is wrapped around this input stream that will automatically notify the this method when the stream has been completely read. At that point, this method is automatically executed, which finishes the decoding operation by decoding the unprotected attributes.
    
    For any application it is strongly recommended recommended not to explicitly call this method. This method only is qualified as public method since it implements the iaik.utils.EOFListener interface.
    
    Specified by:
    
    notifyEOF in interface EOFListener
    
    Throws:
    
    java.io.IOException - if an error occurs while decoding the unprotected attributed
    See Also:
    EOFListener, NotifyEOFInputStream

Class EncryptedDataStream

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

version_

blockSize_

encryptedContentInfo_

unprotectedAttrs_

securityProvider_

m_encryptedData

Constructor Detail

EncryptedDataStream

EncryptedDataStream

EncryptedDataStream

EncryptedDataStream

EncryptedDataStream

Method Detail

setBlockSize

getBlockSize

decode

setupCipher

setupCipher

setupCipher

setUnprotectedAttributes

getContentType

getVersion

getUnprotectedAttributes

getUnprotectedAttribute

getInputStream

toASN1Object

toASN1Object

writeTo

writeTo

getEncryptedContentInfo

toString

toString

notifyEOF