com.braintreegateway.org.apache.commons.codec.binary

Class Base64

java.lang.Object

com.braintreegateway.org.apache.commons.codec.binary.Base64

All Implemented Interfaces:

BinaryDecoder, BinaryEncoder, Decoder, Encoder

public class Base64
extends Object
implements BinaryEncoder, BinaryDecoder

Provides Base64 encoding and decoding as defined by RFC 2045.

This class implements section 6.8. Base64 Content-Transfer-Encoding from RFC 2045 Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies by Freed and Borenstein.

The class can be parameterized in the following manner with various constructors:

• URL-safe mode: Default off.
• Line length: Default 76. Line length that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
• Line separator: Default is CRLF ("\r\n")

Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).

Since:

1.0

Version:

$Id: Base64.java 801706 2009-08-06 16:27:06Z niallp $

Author:

Apache Software Foundation

See Also:

RFC 2045

Field Summary

Fields

Modifier and Type	Field and Description
private byte[]	buffer Buffer for streaming.
(package private) static byte[]	CHUNK_SEPARATOR Chunk separator per RFC 2045 section 2.1.
(package private) static int	CHUNK_SIZE Chunk size per RFC 2045 section 6.8.
private int	currentLinePos Variable tracks how many characters have been written to the current line.
private static byte[]	DECODE_TABLE This array is a lookup table that translates Unicode characters drawn from the "Base64 Alphabet" (as specified in Table 1 of RFC 2045) into their 6-bit positive integer equivalents.
private int	decodeSize Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
private static int	DEFAULT_BUFFER_RESIZE_FACTOR
private static int	DEFAULT_BUFFER_SIZE
private int	encodeSize Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
private byte[]	encodeTable Encode table to use: either STANDARD or URL_SAFE.
private boolean	eof Boolean flag to indicate the EOF has been reached.
private int	lineLength Line length for encoding.
private byte[]	lineSeparator Line separator for encoding.
private static int	MASK_6BITS Mask used to extract 6 bits, used when encoding
private static int	MASK_8BITS Mask used to extract 8 bits, used in decoding base64 bytes
private int	modulus Writes to the buffer only occur after every 3 reads when encoding, an every 4 reads when decoding.
private static byte	PAD Byte used to pad output.
private int	pos Position where next character should be written in the buffer.
private int	readPos Position where next character should be read from the buffer.
private static byte[]	STANDARD_ENCODE_TABLE This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet" equivalents as specified in Table 1 of RFC 2045.
private static byte[]	URL_SAFE_ENCODE_TABLE This is a copy of the STANDARD_ENCODE_TABLE above, but with + and / changed to - and _ to make the encoded Base64 results more URL-SAFE.
private int	x Place holder for the 3 bytes we're dealing with for our base64 logic.

Constructor Summary

Constructors

Constructor and Description
Base64() Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
Base64(boolean urlSafe) Creates a Base64 codec used for decoding (all modes) and encoding in the given URL-safe mode.
Base64(int lineLength) Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
Base64(int lineLength, byte[] lineSeparator) Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
Base64(int lineLength, byte[] lineSeparator, boolean urlSafe) Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.

Method Summary

Methods

Modifier and Type	Method and Description
(package private) int	avail() Returns the amount of buffered data available for reading.
private static boolean	containsBase64Byte(byte[] arrayOctet) Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.
byte[]	decode(byte[] pArray) Decodes a byte[] containing containing characters in the Base64 alphabet.
(package private) void	decode(byte[] in, int inPos, int inAvail) Decodes all of the provided data, starting at inPos, for inAvail bytes.
Object	decode(Object pObject) Decodes an Object using the base64 algorithm.
byte[]	decode(String pArray) Decodes a String containing containing characters in the Base64 alphabet.
static byte[]	decodeBase64(byte[] base64Data) Decodes Base64 data into octets
static byte[]	decodeBase64(String base64String) Decodes a Base64 String into octets
static BigInteger	decodeInteger(byte[] pArray) Decodes a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
(package private) static byte[]	discardWhitespace(byte[] data) Deprecated. This method is no longer needed
byte[]	encode(byte[] pArray) Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.
(package private) void	encode(byte[] in, int inPos, int inAvail) Encodes all of the provided data, starting at inPos, for inAvail bytes.
Object	encode(Object pObject) Encodes an Object using the base64 algorithm.
static byte[]	encodeBase64(byte[] binaryData) Encodes binary data using the base64 algorithm but does not chunk the output.
static byte[]	encodeBase64(byte[] binaryData, boolean isChunked) Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
static byte[]	encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe) Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
static byte[]	encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe, int maxResultSize) Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
static byte[]	encodeBase64Chunked(byte[] binaryData) Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks
static String	encodeBase64String(byte[] binaryData) Encodes binary data using the base64 algorithm into 76 character blocks separated by CRLF.
static byte[]	encodeBase64URLSafe(byte[] binaryData) Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output.
static String	encodeBase64URLSafeString(byte[] binaryData) Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output.
static byte[]	encodeInteger(BigInteger bigInt) Encodes to a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
String	encodeToString(byte[] pArray) Encodes a byte[] containing binary data, into a String containing characters in the Base64 alphabet.
private static long	getEncodeLength(byte[] pArray, int chunkSize, byte[] chunkSeparator) Pre-calculates the amount of space needed to base64-encode the supplied array.
(package private) boolean	hasData() Returns true if this Base64 object has buffered data for reading.
static boolean	isArrayByteBase64(byte[] arrayOctet) Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.
static boolean	isBase64(byte octet) Returns whether or not the octet is in the base 64 alphabet.
boolean	isUrlSafe() Returns our current encode mode.
private static boolean	isWhiteSpace(byte byteToCheck) Checks if a byte value is whitespace or not.
(package private) int	readResults(byte[] b, int bPos, int bAvail) Extracts buffered data into the provided byte[] array, starting at position bPos, up to a maximum of bAvail bytes.
private void	reset() Resets this Base64 object to its initial newly constructed state.
private void	resizeBuffer() Doubles our buffer.
(package private) void	setInitialBuffer(byte[] out, int outPos, int outAvail) Sets the streaming buffer.
(package private) static byte[]	toIntegerBytes(BigInteger bigInt) Returns a byte-array representation of a BigInteger without sign bit.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BUFFER_RESIZE_FACTOR

private static final int DEFAULT_BUFFER_RESIZE_FACTOR

See Also:

Constant Field Values

DEFAULT_BUFFER_SIZE

private static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

CHUNK_SIZE

static final int CHUNK_SIZE

Chunk size per RFC 2045 section 6.8.

The 0 character limit does not count the trailing CRLF, but counts all other characters, including any equal signs.

See Also:

RFC 2045 section 6.8, Constant Field Values

CHUNK_SEPARATOR

static final byte[] CHUNK_SEPARATOR

Chunk separator per RFC 2045 section 2.1.

N.B. The next major release may break compatibility and make this field private.

See Also:

RFC 2045 section 2.1

STANDARD_ENCODE_TABLE

private static final byte[] STANDARD_ENCODE_TABLE

This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet" equivalents as specified in Table 1 of RFC 2045. Thanks to "commons" project in ws.apache.org for this code. http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/

URL_SAFE_ENCODE_TABLE

private static final byte[] URL_SAFE_ENCODE_TABLE

This is a copy of the STANDARD_ENCODE_TABLE above, but with + and / changed to - and _ to make the encoded Base64 results more URL-SAFE. This table is only used when the Base64's mode is set to URL-SAFE.

PAD

private static final byte PAD

Byte used to pad output.

See Also:

Constant Field Values

DECODE_TABLE

private static final byte[] DECODE_TABLE

This array is a lookup table that translates Unicode characters drawn from the "Base64 Alphabet" (as specified in Table 1 of RFC 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64 alphabet but fall within the bounds of the array are translated to -1. Note: '+' and '-' both decode to 62. '/' and '_' both decode to 63. This means decoder seamlessly handles both URL_SAFE and STANDARD base64. (The encoder, on the other hand, needs to know ahead of time what to emit). Thanks to "commons" project in ws.apache.org for this code. http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/

MASK_6BITS

private static final int MASK_6BITS

Mask used to extract 6 bits, used when encoding

See Also:

Constant Field Values

MASK_8BITS

private static final int MASK_8BITS

Mask used to extract 8 bits, used in decoding base64 bytes

See Also:

Constant Field Values

encodeTable

private final byte[] encodeTable

Encode table to use: either STANDARD or URL_SAFE. Note: the DECODE_TABLE above remains static because it is able to decode both STANDARD and URL_SAFE streams, but the encodeTable must be a member variable so we can switch between the two modes.

lineLength

private final int lineLength

Line length for encoding. Not used when decoding. A value of zero or less implies no chunking of the base64 encoded data.

lineSeparator

private final byte[] lineSeparator

Line separator for encoding. Not used when decoding. Only used if lineLength > 0.

decodeSize

private final int decodeSize

Convenience variable to help us determine when our buffer is going to run out of room and needs resizing. decodeSize = 3 + lineSeparator.length;

encodeSize

private final int encodeSize

Convenience variable to help us determine when our buffer is going to run out of room and needs resizing. encodeSize = 4 + lineSeparator.length;

buffer

private byte[] buffer

Buffer for streaming.

pos

private int pos

Position where next character should be written in the buffer.

readPos

private int readPos

Position where next character should be read from the buffer.

currentLinePos

private int currentLinePos

Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to make sure each encoded line never goes beyond lineLength (if lineLength > 0).

modulus

private int modulus

Writes to the buffer only occur after every 3 reads when encoding, an every 4 reads when decoding. This variable helps track that.

eof

private boolean eof

Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this Base64 object becomes useless, and must be thrown away.

x

private int x

Place holder for the 3 bytes we're dealing with for our base64 logic. Bitwise operations store and extract the base64 encoding or decoding from this variable.

Constructor Detail

Base64

public Base64()

Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.

When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.

When decoding all variants are supported.

Base64

public Base64(boolean urlSafe)

Creates a Base64 codec used for decoding (all modes) and encoding in the given URL-safe mode.

When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.

When decoding all variants are supported.

Parameters:

urlSafe - if true, URL-safe encoding is used. In most cases this should be set to false.

Since:

1.4

Base64

public Base64(int lineLength)

Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.

When encoding the line length is given in the constructor, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.

Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.

When decoding all variants are supported.

Parameters:

lineLength - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.

Since:

1.4

Base64

public Base64(int lineLength,
      byte[] lineSeparator)

Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.

When encoding the line length and line separator are given in the constructor, and the encoding table is STANDARD_ENCODE_TABLE.

Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.

When decoding all variants are supported.

Parameters:

lineLength - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.

lineSeparator - Each line of encoded data will end with this sequence of bytes.

Throws:

IllegalArgumentException - Thrown when the provided lineSeparator included some base64 characters.

Since:

1.4

Base64

public Base64(int lineLength,
      byte[] lineSeparator,
      boolean urlSafe)

Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.

When encoding the line length and line separator are given in the constructor, and the encoding table is STANDARD_ENCODE_TABLE.

Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.

When decoding all variants are supported.

Parameters:

lineLength - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.

lineSeparator - Each line of encoded data will end with this sequence of bytes.

urlSafe - Instead of emitting '+' and '/' we emit '-' and '_' respectively. urlSafe is only applied to encode operations. Decoding seamlessly handles both modes.

Throws:

IllegalArgumentException - The provided lineSeparator included some base64 characters. That's not going to work!

Since:

1.4

Method Detail

isUrlSafe

public boolean isUrlSafe()

Returns our current encode mode. True if we're URL-SAFE, false otherwise.

Returns:

true if we're in URL-SAFE mode, false otherwise.

Since:

1.4

hasData

boolean hasData()

Returns true if this Base64 object has buffered data for reading.

Returns:

true if there is Base64 object still available for reading.

avail

int avail()

Returns the amount of buffered data available for reading.

Returns:

The amount of buffered data available for reading.

resizeBuffer

private void resizeBuffer()

Doubles our buffer.

readResults

int readResults(byte[] b,
              int bPos,
              int bAvail)

Extracts buffered data into the provided byte[] array, starting at position bPos, up to a maximum of bAvail bytes. Returns how many bytes were actually extracted.

Parameters:

b - byte[] array to extract the buffered data into.

bPos - position in byte[] array to start extraction at.

bAvail - amount of bytes we're allowed to extract. We may extract fewer (if fewer are available).

Returns:

The number of bytes successfully extracted into the provided byte[] array.

setInitialBuffer

void setInitialBuffer(byte[] out,
                    int outPos,
                    int outAvail)

Sets the streaming buffer. This is a small optimization where we try to buffer directly to the consumer's output array for one round (if the consumer calls this method first) instead of starting our own buffer.

Parameters:

out - byte[] array to buffer directly to.

outPos - Position to start buffering into.

outAvail - Amount of bytes available for direct buffering.

encode

void encode(byte[] in,
          int inPos,
          int inAvail)

Encodes all of the provided data, starting at inPos, for inAvail bytes. Must be called at least twice: once with the data to encode, and once with inAvail set to "-1" to alert encoder that EOF has been reached, so flush last remaining bytes (if not multiple of 3).

Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach. http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/

Parameters:

in - byte[] array of binary data to base64 encode.

inPos - Position to start reading data from.

inAvail - Amount of bytes available from input for encoding.

decode

void decode(byte[] in,
          int inPos,
          int inAvail)

Decodes all of the provided data, starting at inPos, for inAvail bytes. Should be called at least twice: once with the data to decode, and once with inAvail set to "-1" to alert decoder that EOF has been reached. The "-1" call is not necessary when decoding, but it doesn't hurt, either.

Ignores all non-base64 characters. This is how chunked (e.g. 76 character) data is handled, since CR and LF are silently ignored, but has implications for other bytes, too. This method subscribes to the garbage-in, garbage-out philosophy: it will not check the provided data for validity.

Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach. http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/

Parameters:

in - byte[] array of ascii data to base64 decode.

inPos - Position to start reading data from.

inAvail - Amount of bytes available from input for encoding.

isBase64

public static boolean isBase64(byte octet)

Returns whether or not the octet is in the base 64 alphabet.

Parameters:

octet - The value to test

Returns:

true if the value is defined in the the base 64 alphabet, false otherwise.

Since:

1.4

isArrayByteBase64

public static boolean isArrayByteBase64(byte[] arrayOctet)

Tests a given byte array to see if it contains only valid characters within the Base64 alphabet. Currently the method treats whitespace as valid.

Parameters:

arrayOctet - byte array to test

Returns:

true if all bytes are valid characters in the Base64 alphabet or if the byte array is empty; false, otherwise

containsBase64Byte

private static boolean containsBase64Byte(byte[] arrayOctet)

Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.

Parameters:

arrayOctet - byte array to test

Returns:

true if any byte is a valid character in the Base64 alphabet; false herwise

encodeBase64

public static byte[] encodeBase64(byte[] binaryData)

Encodes binary data using the base64 algorithm but does not chunk the output.

Parameters:

binaryData - binary data to encode

Returns:

byte[] containing Base64 characters in their UTF-8 representation.

encodeBase64String

public static String encodeBase64String(byte[] binaryData)

Encodes binary data using the base64 algorithm into 76 character blocks separated by CRLF.

Parameters:

binaryData - binary data to encode

Returns:

String containing Base64 characters.

Since:

1.4

encodeBase64URLSafe

public static byte[] encodeBase64URLSafe(byte[] binaryData)

Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The url-safe variation emits - and _ instead of + and / characters.

Parameters:

binaryData - binary data to encode

Returns:

byte[] containing Base64 characters in their UTF-8 representation.

Since:

1.4

encodeBase64URLSafeString

public static String encodeBase64URLSafeString(byte[] binaryData)

Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The url-safe variation emits - and _ instead of + and / characters.

Parameters:

binaryData - binary data to encode

Returns:

String containing Base64 characters

Since:

1.4

encodeBase64Chunked

public static byte[] encodeBase64Chunked(byte[] binaryData)

Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks

Parameters:

binaryData - binary data to encode

Returns:

Base64 characters chunked in 76 character blocks

decode

public Object decode(Object pObject)
              throws DecoderException

Decodes an Object using the base64 algorithm. This method is provided in order to satisfy the requirements of the Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.

Specified by:

decode in interface Decoder

Parameters:

pObject - Object to decode

Returns:

An object (of type byte[]) containing the binary data which corresponds to the byte[] or String supplied.

Throws:

DecoderException - if the parameter supplied is not of type byte[]

decode

public byte[] decode(String pArray)

Decodes a String containing containing characters in the Base64 alphabet.

Parameters:

pArray - A String containing Base64 character data

Returns:

a byte array containing binary data

Since:

1.4

decode

public byte[] decode(byte[] pArray)

Decodes a byte[] containing containing characters in the Base64 alphabet.

Specified by:

decode in interface BinaryDecoder

Parameters:

pArray - A byte array containing Base64 character data

Returns:

a byte array containing binary data

encodeBase64

public static byte[] encodeBase64(byte[] binaryData,
                  boolean isChunked)

Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.

Parameters:

binaryData - Array containing binary data to encode.

isChunked - if true this encoder will chunk the base64 output into 76 character blocks

Returns:

Base64-encoded data.

Throws:

IllegalArgumentException - Thrown when the input array needs an output array bigger than Integer.MAX_VALUE

encodeBase64

public static byte[] encodeBase64(byte[] binaryData,
                  boolean isChunked,
                  boolean urlSafe)

Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.

Parameters:

binaryData - Array containing binary data to encode.

isChunked - if true this encoder will chunk the base64 output into 76 character blocks

urlSafe - if true this encoder will emit - and _ instead of the usual + and / characters.

Returns:

Base64-encoded data.

Throws:

IllegalArgumentException - Thrown when the input array needs an output array bigger than Integer.MAX_VALUE

Since:

1.4

encodeBase64

public static byte[] encodeBase64(byte[] binaryData,
                  boolean isChunked,
                  boolean urlSafe,
                  int maxResultSize)

Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.

Parameters:

binaryData - Array containing binary data to encode.

isChunked - if true this encoder will chunk the base64 output into 76 character blocks

urlSafe - if true this encoder will emit - and _ instead of the usual + and / characters.

maxResultSize - The maximum result size to accept.

Returns:

Base64-encoded data.

Throws:

IllegalArgumentException - Thrown when the input array needs an output array bigger than maxResultSize

Since:

1.4

decodeBase64

public static byte[] decodeBase64(String base64String)

Decodes a Base64 String into octets

Parameters:

base64String - String containing Base64 data

Returns:

Array containing decoded data.

Since:

1.4

decodeBase64

public static byte[] decodeBase64(byte[] base64Data)

Decodes Base64 data into octets

Parameters:

base64Data - Byte array containing Base64 data

Returns:

Array containing decoded data.

discardWhitespace

static byte[] discardWhitespace(byte[] data)

Deprecated. This method is no longer needed

Discards any whitespace from a base-64 encoded block.

Parameters:

data - The base-64 encoded data to discard the whitespace from.

Returns:

The data, less whitespace (see RFC 2045).

isWhiteSpace

private static boolean isWhiteSpace(byte byteToCheck)

Checks if a byte value is whitespace or not.

Parameters:

byteToCheck - the byte to check

Returns:

true if byte is whitespace, false otherwise

encode

public Object encode(Object pObject)
              throws EncoderException

Encodes an Object using the base64 algorithm. This method is provided in order to satisfy the requirements of the Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].

Specified by:

encode in interface Encoder

Parameters:

pObject - Object to encode

Returns:

An object (of type byte[]) containing the base64 encoded data which corresponds to the byte[] supplied.

Throws:

EncoderException - if the parameter supplied is not of type byte[]

encodeToString

public String encodeToString(byte[] pArray)

Encodes a byte[] containing binary data, into a String containing characters in the Base64 alphabet.

Parameters:

pArray - a byte array containing binary data

Returns:

A String containing only Base64 character data

Since:

1.4

encode

public byte[] encode(byte[] pArray)

Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64 alphabet.

Specified by:

encode in interface BinaryEncoder

Parameters:

pArray - a byte array containing binary data

Returns:

A byte array containing only Base64 character data

getEncodeLength

private static long getEncodeLength(byte[] pArray,
                   int chunkSize,
                   byte[] chunkSeparator)

Pre-calculates the amount of space needed to base64-encode the supplied array.

Parameters:

pArray - byte[] array which will later be encoded

chunkSize - line-length of the output (<= 0 means no chunking) between each chunkSeparator (e.g. CRLF).

chunkSeparator - the sequence of bytes used to separate chunks of output (e.g. CRLF).

Returns:

amount of space needed to encoded the supplied array. Returns a long since a max-len array will require Integer.MAX_VALUE + 33%.

decodeInteger

public static BigInteger decodeInteger(byte[] pArray)

Decodes a byte64-encoded integer according to crypto standards such as W3C's XML-Signature

Parameters:

pArray - a byte array containing base64 character data

Returns:

A BigInteger

Since:

1.4

encodeInteger

public static byte[] encodeInteger(BigInteger bigInt)

Encodes to a byte64-encoded integer according to crypto standards such as W3C's XML-Signature

Parameters:

bigInt - a BigInteger

Returns:

A byte array containing base64 character data

Throws:

NullPointerException - if null is passed in

Since:

1.4

toIntegerBytes

static byte[] toIntegerBytes(BigInteger bigInt)

Returns a byte-array representation of a BigInteger without sign bit.

Parameters:

bigInt - BigInteger to be converted

Returns:

a byte array representation of the BigInteger parameter

reset

private void reset()

Resets this Base64 object to its initial newly constructed state.