Package org.bouncycastle.crypto.params
Class ECCSIKeyGenerationParameters
- java.lang.Object
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- org.bouncycastle.crypto.KeyGenerationParameters
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- org.bouncycastle.crypto.params.ECCSIKeyGenerationParameters
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public class ECCSIKeyGenerationParameters extends KeyGenerationParameters
Parameters for ECCSI key generation.This class encapsulates the parameters required for ECCSI (Elliptic Curve Certificateless Signatures for Identity-based encryption) key generation. It holds the elliptic curve domain parameters and computes the key pair components used in ECCSI.
The secret component
ksak
is generated randomly and reduced moduloq
, whilekpak
is derived fromksak
by multiplying the generator point.
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Constructor Summary
Constructors Constructor Description ECCSIKeyGenerationParameters(java.security.SecureRandom random, X9ECParameters params, Digest digest, byte[] id)
Constructs an instance ofECCSIKeyGenerationParameters
with the specified source of randomness, elliptic curve parameters, digest algorithm, and identifier.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.math.BigInteger
computeSSK(java.math.BigInteger hs_v)
Computes the session secret key (SSK) by adding the provided value to the secret key component and reducing modulo the curve order.Digest
getDigest()
Returns the digest algorithm used for key generation.ECPoint
getG()
Returns the generator (base point) of the elliptic curve.byte[]
getId()
Returns a copy of the identifier used in these parameters.ECPoint
getKPAK()
Returns the public key component (kpak) corresponding to the secret key.int
getN()
Returns the bit length used in key generation.java.math.BigInteger
getQ()
Returns the order of the elliptic curve.-
Methods inherited from class org.bouncycastle.crypto.KeyGenerationParameters
getRandom, getStrength
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Constructor Detail
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ECCSIKeyGenerationParameters
public ECCSIKeyGenerationParameters(java.security.SecureRandom random, X9ECParameters params, Digest digest, byte[] id)
Constructs an instance ofECCSIKeyGenerationParameters
with the specified source of randomness, elliptic curve parameters, digest algorithm, and identifier.- Parameters:
random
- the source of randomness.params
- the elliptic curve parameters (in X9.62 format) providing the curve, order, and generator.digest
- the digest algorithm to be used.id
- the identifier associated with the key generation (e.g. a user or device ID).
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Method Detail
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getId
public byte[] getId()
Returns a copy of the identifier used in these parameters.- Returns:
- a byte array containing the identifier.
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getKPAK
public ECPoint getKPAK()
Returns the public key component (kpak) corresponding to the secret key.- Returns:
- the public key point.
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computeSSK
public java.math.BigInteger computeSSK(java.math.BigInteger hs_v)
Computes the session secret key (SSK) by adding the provided value to the secret key component and reducing modulo the curve order.- Parameters:
hs_v
- a BigInteger value (typically derived from a hash) to be added to the secret.- Returns:
- the computed session secret key.
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getQ
public java.math.BigInteger getQ()
Returns the order of the elliptic curve.- Returns:
- the curve order.
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getG
public ECPoint getG()
Returns the generator (base point) of the elliptic curve.- Returns:
- the generator point.
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getDigest
public Digest getDigest()
Returns the digest algorithm used for key generation.- Returns:
- the digest.
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getN
public int getN()
Returns the bit length used in key generation.- Returns:
- the bit length.
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