org.bouncycastle.crypto.generators
Class DSAParametersGenerator
java.lang.Object
org.bouncycastle.crypto.generators.DSAParametersGenerator
public class DSAParametersGenerator
- extends java.lang.Object
generate suitable parameters for DSA, in line with FIPS 186-2.
Field Summary |
private int |
certainty
|
private static java.math.BigInteger |
ONE
|
private java.security.SecureRandom |
random
|
private int |
size
|
private static java.math.BigInteger |
TWO
|
Method Summary |
private void |
add(byte[] a,
byte[] b,
int value)
add value to b, returning the result in a. |
DSAParameters |
generateParameters()
which generates the p and g values from the given parameters,
returning the DSAParameters object. |
void |
init(int size,
int certainty,
java.security.SecureRandom random)
initialise the key generator. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
size
private int size
certainty
private int certainty
random
private java.security.SecureRandom random
ONE
private static final java.math.BigInteger ONE
TWO
private static final java.math.BigInteger TWO
DSAParametersGenerator
public DSAParametersGenerator()
init
public void init(int size,
int certainty,
java.security.SecureRandom random)
- initialise the key generator.
- Parameters:
size
- size of the key (range 2^512 -> 2^1024 - 64 bit increments)certainty
- measure of robustness of prime (for FIPS 186-2 compliance this should be at least 80).random
- random byte source.
add
private void add(byte[] a,
byte[] b,
int value)
- add value to b, returning the result in a. The a value is treated
as a BigInteger of length (a.length * 8) bits. The result is
modulo 2^a.length in case of overflow.
generateParameters
public DSAParameters generateParameters()
- which generates the p and g values from the given parameters,
returning the DSAParameters object.
Note: can take a while...