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java.lang.Objectjavax.crypto.KeyAgreementSpi
com.ibm.crypto.provider.DHKeyAgreement
public final class DHKeyAgreement
This class implements the Diffie-Hellman key agreement protocol between any number of parties.
Field Summary | |
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static int |
BLOWFISH_BLOCK_SIZE
|
static int |
BLOWFISH_MAX_KEYSIZE
|
Constructor Summary | |
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DHKeyAgreement()
Verify the JCE framework in the constructor. |
Method Summary | |
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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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int BLOWFISH_BLOCK_SIZE
public static final int BLOWFISH_MAX_KEYSIZE
Constructor Detail |
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public DHKeyAgreement()
SecurityException
- if fails to verify
the JCE framework.Method Detail |
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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.
engineInit
in class KeyAgreementSpi
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 randomness
InvalidKeyException
- if the given key is
inappropriate for this key agreement, e.g., is of the wrong type or
has an incompatible algorithm type.protected void engineInit(Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException
engineInit
in class KeyAgreementSpi
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 randomness
InvalidKeyException
- if the given key is
inappropriate for this key agreement, e.g., is of the wrong type or
has an incompatible algorithm type.
InvalidAlgorithmParameterException
- if the given parameters
are inappropriate for this key agreement.protected Key engineDoPhase(Key key, boolean lastPhase) throws InvalidKeyException, IllegalStateException
engineDoPhase
in class KeyAgreementSpi
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.
InvalidKeyException
- if the given key is inappropriate for
this phase.
IllegalStateException
- if this key agreement has not been
initialized.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.
engineGenerateSecret
in class KeyAgreementSpi
IllegalStateException
- if this key agreement has not been
completed yetprotected 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.
engineGenerateSecret
in class KeyAgreementSpi
sharedSecret
- the buffer for the shared secretoffset
- the offset in sharedSecret
where the
shared secret will be stored
sharedSecret
IllegalStateException
- if this key agreement has not been
completed yet
ShortBufferException
- if the given output buffer is too small
to hold the secretprotected 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.
engineGenerateSecret
in class KeyAgreementSpi
algorithm
- the requested secret key algorithm
IllegalStateException
- if this key agreement has not been
completed yet
NoSuchAlgorithmException
- if the requested secret key
algorithm is not available
InvalidKeyException
- if the shared secret key material cannot
be used to generate a secret key of the requested algorithm type (e.g.,
the key material is too short)
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