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java.lang.Object | +--javax.crypto.KeyAgreementSpi | +--com.ibm.crypto.provider.DHKeyAgreement
This class implements the Diffie-Hellman key agreement protocol between any number of parties.
Fields inherited from interface com.ibm.crypto.provider.BlowfishConstants |
BLOWFISH_BLOCK_SIZE,
BLOWFISH_MAX_KEYSIZE |
Constructor Summary | |
DHKeyAgreement()
Verify the JCE framework in the constructor. |
Method Summary | |
protected Key |
engineDoPhase(Key key,
boolean lastPhase)
Executes the next phase of this key agreement with the given key that was received from one of the other parties involved in this key agreement. |
protected byte[] |
engineGenerateSecret()
Generates the shared secret and returns it in a new buffer. |
protected int |
engineGenerateSecret(byte[] sharedSecret,
int offset)
Generates the shared secret, and places it into the buffer sharedSecret , beginning at offset . |
protected SecretKey |
engineGenerateSecret(String algorithm)
Creates the shared secret and returns it as a secret key object of the requested algorithm type. |
protected void |
engineInit(Key key,
AlgorithmParameterSpec params,
SecureRandom random)
Initializes this key agreement with the given key, set of algorithm parameters, and source of randomness. |
protected void |
engineInit(Key key,
SecureRandom random)
Initializes this key agreement with the given key and source of randomness. |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Constructor Detail |
public DHKeyAgreement()
Method Detail |
protected void engineInit(Key key, SecureRandom random) throws InvalidKeyException
If the key agreement algorithm requires random bytes, it gets them
from the given source of randomness, random
.
However, if the underlying
algorithm implementation does not require any random bytes,
random
is ignored.
key
- the party's private information. For example, in the case
of the Diffie-Hellman key agreement, this would be the party's own
Diffie-Hellman private key.random
- the source of randomnessprotected void engineInit(Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException
key
- the party's private information. For example, in the case
of the Diffie-Hellman key agreement, this would be the party's own
Diffie-Hellman private key.params
- the key agreement parametersrandom
- the source of randomnessprotected Key engineDoPhase(Key key, boolean lastPhase) throws InvalidKeyException, IllegalStateException
key
- the key for this phase. For example, in the case of
Diffie-Hellman between 2 parties, this would be the other party's
Diffie-Hellman public key.lastPhase
- flag which indicates whether or not this is the last
phase of this key agreement.protected byte[] engineGenerateSecret() throws IllegalStateException
This method resets this KeyAgreementSpi
object,
so that it
can be reused for further key agreements. Unless this key agreement is
reinitialized with one of the engineInit
methods, the same
private information and algorithm parameters will be used for
subsequent key agreements.
protected int engineGenerateSecret(byte[] sharedSecret, int offset) throws IllegalStateException, ShortBufferException
sharedSecret
, beginning at offset
.
If the sharedSecret
buffer is too small to hold the
result, a ShortBufferException
is thrown.
In this case, this call should be repeated with a larger output buffer.
This method resets this KeyAgreementSpi
object,
so that it
can be reused for further key agreements. Unless this key agreement is
reinitialized with one of the engineInit
methods, the same
private information and algorithm parameters will be used for
subsequent key agreements.
sharedSecret
- the buffer for the shared secretoffset
- the offset in sharedSecret
where the
shared secret will be storedsharedSecret
protected SecretKey engineGenerateSecret(String algorithm) throws IllegalStateException, NoSuchAlgorithmException, InvalidKeyException
This method resets this KeyAgreementSpi
object,
so that it
can be reused for further key agreements. Unless this key agreement is
reinitialized with one of the engineInit
methods, the same
private information and algorithm parameters will be used for
subsequent key agreements.
algorithm
- the requested secret key algorithm
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