com.unboundid.util

Class PassphraseEncryptedInputStream

java.lang.Object

java.io.InputStream

com.unboundid.util.PassphraseEncryptedInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

@ThreadSafety(level=NOT_THREADSAFE)
public final class PassphraseEncryptedInputStream
extends java.io.InputStream

This class provides an InputStream implementation that can read encrypted data written by the PassphraseEncryptedOutputStream. It will use a provided password in conjunction with a PassphraseEncryptedStreamHeader that will either be read from the beginning of the stream or provided in the constructor.

Constructor Summary

Constructors

Constructor and Description
PassphraseEncryptedInputStream(char[] passphrase, java.io.InputStream wrappedInputStream) Creates a new passphrase-encrypted input stream that will read the PassphraseEncryptedStreamHeader from the underlying input stream.
PassphraseEncryptedInputStream(java.io.InputStream wrappedInputStream, PassphraseEncryptedStreamHeader encryptionHeader) Creates a new passphrase-encrypted input stream using the provided information.
PassphraseEncryptedInputStream(java.lang.String passphrase, java.io.InputStream wrappedInputStream) Creates a new passphrase-encrypted input stream that will read the PassphraseEncryptedStreamHeader from the underlying input stream.

Method Summary

Methods

Modifier and Type	Method and Description
int	available() Retrieves an estimate of the number of decrypted byte that are available to read from the underlying stream without blocking.
void	close() Closes this input stream and the underlying stream.
PassphraseEncryptedStreamHeader	getEncryptionHeader() Retrieves an encryption header with details about the encryption used when the data was originally written.
void	mark(int readLimit) Marks the current position in this input stream so that the caller may return to that spot (and re-read the data) using the reset() method.
boolean	markSupported() Indicates whether this input stream supports the use of the mark(int) and reset() methods.
int	read() Retrieves a single byte of decrypted data read from the underlying input stream.
int	read(byte[] b) Reads decrypted data and writes it into the provided byte array.
int	read(byte[] b, int offset, int length) Reads decrypted data and writes it into the specified portion of the provided byte array.
void	reset() Attempts to reset the position of this input stream to the position of the last call to mark(int).
long	skip(long maxBytesToSkip) Skips over and discards up to the specified number of bytes of decrypted data obtained from the underlying input stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

PassphraseEncryptedInputStream

public PassphraseEncryptedInputStream(@NotNull
                              java.lang.String passphrase,
                              @NotNull
                              java.io.InputStream wrappedInputStream)
                               throws java.io.IOException,
                                      LDAPException,
                                      java.security.InvalidKeyException,
                                      java.security.GeneralSecurityException

Creates a new passphrase-encrypted input stream that will read the PassphraseEncryptedStreamHeader from the underlying input stream.

Parameters:

passphrase - The passphrase used to generate the encryption key when the corresponding PassphraseEncryptedOutputStream was created.

wrappedInputStream - The input stream from which the encryption header and encrypted data will be read.

Throws:

java.io.IOException - If a problem is encountered while trying to read the encryption header from the provided input stream.

LDAPException - If s problem is encountered while trying to parse the encryption header read from the provided input stream.

java.security.InvalidKeyException - If the MAC contained in the header does not match the expected value.

java.security.GeneralSecurityException - If a problem occurs while attempting to initialize the decryption.

PassphraseEncryptedInputStream

public PassphraseEncryptedInputStream(@NotNull
                              char[] passphrase,
                              @NotNull
                              java.io.InputStream wrappedInputStream)
                               throws java.io.IOException,
                                      LDAPException,
                                      java.security.InvalidKeyException,
                                      java.security.GeneralSecurityException

Creates a new passphrase-encrypted input stream that will read the PassphraseEncryptedStreamHeader from the underlying input stream.

Parameters:

passphrase - The passphrase used to generate the encryption key when the corresponding PassphraseEncryptedOutputStream was created.

wrappedInputStream - The input stream from which the encryption header and encrypted data will be read.

Throws:

java.io.IOException - If a problem is encountered while trying to read the encryption header from the provided input stream.

LDAPException - If s problem is encountered while trying to parse the encryption header read from the provided input stream.

java.security.InvalidKeyException - If the MAC contained in the header does not match the expected value.

java.security.GeneralSecurityException - If a problem occurs while attempting to initialize the decryption.

PassphraseEncryptedInputStream

public PassphraseEncryptedInputStream(@NotNull
                              java.io.InputStream wrappedInputStream,
                              @NotNull
                              PassphraseEncryptedStreamHeader encryptionHeader)
                               throws java.security.GeneralSecurityException

Creates a new passphrase-encrypted input stream using the provided information.

Parameters:

wrappedInputStream - The input stream from which the encrypted data will be read.

encryptionHeader - The encryption header with the information needed (in conjunction with the given passphrase) to decrypt the data read from the provided input stream.

Throws:

java.security.GeneralSecurityException - If a problem occurs while attempting to initialize the decryption.

Method Detail

read

public int read()
         throws java.io.IOException

Retrieves a single byte of decrypted data read from the underlying input stream.

Specified by:

read in class java.io.InputStream

Returns:

A value that is between 0 and 255 representing the byte that was read, or -1 to indicate that the end of the input stream has been reached.

Throws:

java.io.IOException - If a problem is encountered while reading or decrypting the data.

read

public int read(@NotNull
       byte[] b)
         throws java.io.IOException

Reads decrypted data and writes it into the provided byte array.

Overrides:

read in class java.io.InputStream

Parameters:

b - The byte array into which the decrypted data will be placed, starting with an index of zero. It must not be null or empty.

Returns:

The number of bytes added to the provided buffer, or -1 if the end of the input stream has been reached and there is no more data to read.

Throws:

java.io.IOException - If a problem is encountered while reading or decrypting the data.

read

public int read(@NotNull
       byte[] b,
       int offset,
       int length)
         throws java.io.IOException

Reads decrypted data and writes it into the specified portion of the provided byte array.

Overrides:

read in class java.io.InputStream

Parameters:

b - The byte array into which the decrypted data will be placed. It must not be null or empty.

offset - The position in the provided array at which to begin adding the decrypted data. It must be greater than or equal to zero and less than the length of the provided array.

length - The maximum number of bytes to be added to the given array. This must be greater than zero, and the sum of the offset and length must be less than or equal to the length of the provided array.

Returns:

The number of bytes added to the provided buffer, or -1 if the end of the input stream has been reached and there is no more data to read.

Throws:

java.io.IOException - If a problem is encountered while reading or decrypting the data.

skip

public long skip(long maxBytesToSkip)
          throws java.io.IOException

Skips over and discards up to the specified number of bytes of decrypted data obtained from the underlying input stream.

Overrides:

skip in class java.io.InputStream

Parameters:

maxBytesToSkip - The maximum number of bytes to skip.

Returns:

The number of bytes that were actually skipped.

Throws:

java.io.IOException - If a problem is encountered while skipping data from the stream.

available

public int available()
              throws java.io.IOException

Retrieves an estimate of the number of decrypted byte that are available to read from the underlying stream without blocking. Note that some implementations always return a value of zero, so a return value of zero does not necessarily mean that there is no data available to read.

Overrides:

available in class java.io.InputStream

Returns:

An estimate of the number of decrypted bytes that are available to read from the underlying stream without blocking.

Throws:

java.io.IOException - If a problem is encountered while attempting to determine the number of bytes available to read.

close

public void close()
           throws java.io.IOException

Closes this input stream and the underlying stream.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException - If a problem is encountered while closing the stream.

markSupported

public boolean markSupported()

Indicates whether this input stream supports the use of the mark(int) and reset() methods.

Overrides:

markSupported in class java.io.InputStream

Returns:

true if this input stream supports the mark and reset methods, or false if not.

mark

public void mark(int readLimit)

Marks the current position in this input stream so that the caller may return to that spot (and re-read the data) using the reset() method. Use the markSupported() method to determine whether this feature is supported for this input stream.

Overrides:

mark in class java.io.InputStream

Parameters:

readLimit - The maximum number of bytes expected to be read between the mark and the call to the reset method.

reset

public void reset()
           throws java.io.IOException

Attempts to reset the position of this input stream to the position of the last call to mark(int). Use the markSupported() method to determine whether this feature is supported for ths input stream.

Overrides:

reset in class java.io.InputStream

Throws:

java.io.IOException - If a problem is encountered while performing the reset (e.g., no mark has been set, if too much data has been read since setting the mark, or if the mark and reset methods are not supported).

getEncryptionHeader

@NotNull
public PassphraseEncryptedStreamHeader getEncryptionHeader()

Retrieves an encryption header with details about the encryption used when the data was originally written.

Returns:

An encryption header with details about the encryption used when the data was originally written.