Package org.apache.sshd.common.kex

Class DHGroupData

java.lang.Object

org.apache.sshd.common.kex.DHGroupData

public final class DHGroupData
extends java.lang.Object

Simple class holding the data for DH group key exchanges.

Field Summary

Fields

Modifier and Type	Field	Description
private static java.util.concurrent.ConcurrentHashMap<java.lang.String,byte[]>	OAKLEY_GROUPS

Constructor Summary

Constructors

Modifier	Constructor	Description
private	DHGroupData()

Method Summary

Modifier and Type	Method	Description
static byte[]	getG()
static byte[]	getOakleyGroupPrimeValue(java.lang.String name)
static byte[]	getP1()
static byte[]	getP14()
static byte[]	getP15()
static byte[]	getP16()
static byte[]	getP17()
static byte[]	getP18()
static byte[]	parseOakleyGroupPrimeValue(java.lang.String str)	Parses the string assumed to contain a HEX-encoded Oakely prime value in big endian format
static byte[]	readOakleyGroupPrimeValue(java.io.BufferedReader br)	Reads a HEX encoded prime value from a possibly multi-line input as follows:
static byte[]	readOakleyGroupPrimeValue(java.io.InputStream stream)
static byte[]	readOakleyGroupPrimeValue(java.io.Reader r)
static byte[]	readOakleyGroupPrimeValue(java.lang.String name)	Reads a HEX-encoded Oakley prime value from an internal resource file
static byte[]	readOakleyGroupPrimeValue(java.util.stream.Stream<java.lang.String> lines)

Methods inherited from class java.lang.Object

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

Field Detail

OAKLEY_GROUPS

private static final java.util.concurrent.ConcurrentHashMap<java.lang.String,byte[]> OAKLEY_GROUPS

Constructor Detail

DHGroupData

private DHGroupData()

Method Detail

getG

public static byte[] getG()

getP1

public static byte[] getP1()

getP14

public static byte[] getP14()

getP15

public static byte[] getP15()

getP16

public static byte[] getP16()

getP17

public static byte[] getP17()

getP18

public static byte[] getP18()

getOakleyGroupPrimeValue

public static byte[] getOakleyGroupPrimeValue(java.lang.String name)

Parameters:

name - The name of the resource file containing the prime value data

Returns:

The prime value bytes suitable for building a BigInteger

readOakleyGroupPrimeValue

public static byte[] readOakleyGroupPrimeValue(java.lang.String name)
                                        throws java.io.IOError

Reads a HEX-encoded Oakley prime value from an internal resource file

Parameters:

name - The name of the resource file containing the prime value data. See org.apache.sshd.common.kex package for available primes

Returns:

The prime value bytes suitable for building a BigInteger

Throws:

java.io.IOError - If failed to access/read the required resource

See Also:

readOakleyGroupPrimeValue(InputStream)

readOakleyGroupPrimeValue

public static byte[] readOakleyGroupPrimeValue(java.io.InputStream stream)
                                        throws java.io.IOException

Throws:

java.io.IOException

readOakleyGroupPrimeValue

public static byte[] readOakleyGroupPrimeValue(java.io.Reader r)
                                        throws java.io.IOException

Throws:

java.io.IOException

readOakleyGroupPrimeValue

public static byte[] readOakleyGroupPrimeValue(java.io.BufferedReader br)
                                        throws java.io.IOException

Reads a HEX encoded prime value from a possibly multi-line input as follows:

• Lines are trimmed and all whitespaces removed.
• Empty lines (after trimming) are ignored.
• Lines beginning with "#" are ignored (assumed to be comments).
• Remaining lines are appended to one big string assumed to contain the HEX-encoded value

Parameters:

br - The BufferedReader to read the data from

Returns:

The prime value bytes suitable for building a BigInteger

Throws:

java.io.IOException - If invalid data or no encoded value found

See Also:

parseOakleyGroupPrimeValue

readOakleyGroupPrimeValue

public static byte[] readOakleyGroupPrimeValue(java.util.stream.Stream<java.lang.String> lines)
                                        throws java.lang.NumberFormatException

Throws:

java.lang.NumberFormatException

parseOakleyGroupPrimeValue

public static byte[] parseOakleyGroupPrimeValue(java.lang.String str)
                                         throws java.lang.NumberFormatException

Parses the string assumed to contain a HEX-encoded Oakely prime value in big endian format

Parameters:

str - The HEX-encoded string to decode - ignored if null/empty

Returns:

The prime value bytes suitable for building a BigInteger or empty array if no input

Throws:

java.lang.NumberFormatException - if malformed encoded value