Package org.bouncycastle.crypto.params
Class SAKKEPublicKeyParameters
- java.lang.Object
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- org.bouncycastle.crypto.params.AsymmetricKeyParameter
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- org.bouncycastle.crypto.params.SAKKEPublicKeyParameters
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- All Implemented Interfaces:
CipherParameters
public class SAKKEPublicKeyParameters extends AsymmetricKeyParameter
Represents the public parameters for the SAKKE (Sakai-Kasahara Key Encryption) scheme as defined in RFC 6508. This class encapsulates the cryptographic domain parameters and public key components required for SAKKE operations.Contains the following public parameters (RFC 6508, Section 2.3):
- Prime modulus
p
defining the field F_p - Subgroup order
q
(divides p+1) - Base point
P
on the elliptic curve E(F_p) - Pairing result
g = <P,P>
- KMS Public Key
Z_S = [z_S]P
- Security parameter
n
(SSV bit length) - User Identifier
- Elliptic curve parameters (a = -3, b = 0)
The predefined parameters in this implementation correspond to the 128-bit security level example from RFC 6509 Appendix A.
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Constructor Summary
Constructors Constructor Description SAKKEPublicKeyParameters(java.math.BigInteger identifier, ECPoint Z)
Constructs SAKKE public key parameters with the specified identifier and KMS Public Key.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ECCurve
getCurve()
Digest
getDigest()
java.math.BigInteger
getG()
java.math.BigInteger
getIdentifier()
int
getN()
ECPoint
getPoint()
java.math.BigInteger
getPrime()
java.math.BigInteger
getQ()
ECPoint
getZ()
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Methods inherited from class org.bouncycastle.crypto.params.AsymmetricKeyParameter
isPrivate
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Constructor Detail
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SAKKEPublicKeyParameters
public SAKKEPublicKeyParameters(java.math.BigInteger identifier, ECPoint Z)
Constructs SAKKE public key parameters with the specified identifier and KMS Public Key.- Parameters:
identifier
- The user's identifier as defined in RFC 6508, Section 2.2. Must be a valid integer in [2, q-1].Z
- The KMS Public Key Z_S = [z_S]P (RFC 6508, Section 2.2). Must be a valid point on the curve E(F_p).
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Method Detail
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getIdentifier
public java.math.BigInteger getIdentifier()
- Returns:
- The user's identifier (RFC 6508, Section 2.2)
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getZ
public ECPoint getZ()
- Returns:
- The KMS Public Key Z_S = [z_S]P (RFC 6508, Section 2.2)
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getCurve
public ECCurve getCurve()
- Returns:
- The elliptic curve E(F_p) with parameters from RFC 6509 Appendix A
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getPoint
public ECPoint getPoint()
- Returns:
- The base point P on E(F_p) (RFC 6508, Section 3.1)
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getPrime
public java.math.BigInteger getPrime()
- Returns:
- Prime modulus p defining the field F_p (RFC 6508, Section 2.1)
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getQ
public java.math.BigInteger getQ()
- Returns:
- Subgroup order q (divides p+1) (RFC 6508, Section 2.1)
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getN
public int getN()
- Returns:
- Security parameter n (SSV bit length = 128 bits)
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getDigest
public Digest getDigest()
- Returns:
- The hash function (SHA-256) used in SAKKE operations
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getG
public java.math.BigInteger getG()
- Returns:
- The pairing result g =
(RFC 6508, Section 3.2)
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