org.bouncycastle.crypto.agreement
public class: DHBasicAgreement [javadoc |
source]
java.lang.Object
org.bouncycastle.crypto.agreement.DHBasicAgreement
All Implemented Interfaces:
BasicAgreement
a Diffie-Hellman key agreement class.
note: This is only the basic algorithm, it doesn't take advantage of
long term public keys if they are available. See the DHAgreement class
for a "better" implementation.
| Method from org.bouncycastle.crypto.agreement.DHBasicAgreement Detail: |
|---|
 public BigInteger calculateAgreement(CipherParameters pubKey) {
DHPublicKeyParameters pub = (DHPublicKeyParameters)pubKey;
if (!pub.getParameters().equals(dhParams))
{
throw new IllegalArgumentException("Diffie-Hellman public key has wrong parameters.");
}
return pub.getY().modPow(key.getX(), dhParams.getP());
}
given a short term public key from a given party calculate the next
message in the agreement sequence. |
public void init(CipherParameters param) {
AsymmetricKeyParameter kParam;
if (param instanceof ParametersWithRandom)
{
ParametersWithRandom rParam = (ParametersWithRandom)param;
kParam = (AsymmetricKeyParameter)rParam.getParameters();
}
else
{
kParam = (AsymmetricKeyParameter)param;
}
if (!(kParam instanceof DHPrivateKeyParameters))
{
throw new IllegalArgumentException("DHEngine expects DHPrivateKeyParameters");
}
this.key = (DHPrivateKeyParameters)kParam;
this.dhParams = key.getParameters();
} |
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