Class ECUtil

java.lang.Object

org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil

public class ECUtil
extends Object

utility class for converting jce/jca ECDSA, ECDH, and ECDHC objects into their org.bouncycastle.crypto counterparts.

Constructor Summary

Constructors

Constructor	Description
ECUtil()

Method Summary

Modifier and Type	Method	Description
static String	generateKeyFingerprint(ECPoint publicPoint, ECParameterSpec spec)
static AsymmetricKeyParameter	generatePrivateKeyParameter(PrivateKey key)
static AsymmetricKeyParameter	generatePublicKeyParameter(PublicKey key)
static String	getCurveName(ASN1ObjectIdentifier oid)
static ECDomainParameters	getDomainParameters(ProviderConfiguration configuration, X962Parameters params)
static ECDomainParameters	getDomainParameters(ProviderConfiguration configuration, ECParameterSpec params)
static X9ECParameters	getNamedCurveByName(String curveName)
static X9ECParameters	getNamedCurveByOid(ASN1ObjectIdentifier oid)
static ASN1ObjectIdentifier	getNamedCurveOid(String curveName)
static ASN1ObjectIdentifier	getNamedCurveOid(ECParameterSpec ecParameterSpec)
static String	getNameFrom(AlgorithmParameterSpec paramSpec)
static int	getOrderBitLength(ProviderConfiguration configuration, BigInteger order, BigInteger privateValue)
static byte[]	getUncompressedSubjectPublicKeyBytes(SubjectPublicKeyInfo spki, ProviderConfiguration configuration)	Return the subjectPublicKey bytes of a SubjectPublicKeyInfo with an EC point normalised to its uncompressed encoding, and the bytes of any other key type unchanged.
static int	privateKeyHashCode(BigInteger d, ECParameterSpec spec)	Hash code for an EC private scalar derived from the public point and domain parameters.
static String	privateKeyToString(String algorithm, BigInteger d, ECParameterSpec spec)
static String	publicKeyToString(String algorithm, ECPoint q, ECParameterSpec spec)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ECUtil

public ECUtil()

Method Details

getDomainParameters

public static ECDomainParameters getDomainParameters(ProviderConfiguration configuration,
 ECParameterSpec params)

getDomainParameters

public static ECDomainParameters getDomainParameters(ProviderConfiguration configuration,
 X962Parameters params)

generatePublicKeyParameter

public static AsymmetricKeyParameter generatePublicKeyParameter(PublicKey key)
                                                         throws InvalidKeyException

Throws:

InvalidKeyException

generatePrivateKeyParameter

public static AsymmetricKeyParameter generatePrivateKeyParameter(PrivateKey key)
                                                          throws InvalidKeyException

Throws:

InvalidKeyException

getOrderBitLength

public static int getOrderBitLength(ProviderConfiguration configuration,
 BigInteger order,
 BigInteger privateValue)

getNamedCurveOid

public static ASN1ObjectIdentifier getNamedCurveOid(String curveName)

getNamedCurveOid

public static ASN1ObjectIdentifier getNamedCurveOid(ECParameterSpec ecParameterSpec)

getUncompressedSubjectPublicKeyBytes

public static byte[] getUncompressedSubjectPublicKeyBytes(SubjectPublicKeyInfo spki,
 ProviderConfiguration configuration)

Return the subjectPublicKey bytes of a SubjectPublicKeyInfo with an EC point normalised to its uncompressed encoding, and the bytes of any other key type unchanged.

The composite drafts (draft-ietf-lamps-pq-composite-sigs / -kem sec. 4) require an EC component to be carried as an uncompressed point, so a component key that would encode itself compressed - a BC EC key whose point format has been set through ECPointEncoder, or a key from a provider that preserves a compressed encoding - has to be normalised on the way out rather than passed through as it came. This is a write-side normalisation only: a compressed component is still accepted on decode, as the component key factories decode either form.

Parameters:

spki - the key to take the component bytes from.

configuration - provider configuration, consulted only for implicitlyCA and additional curve parameters.

Returns:

the component key bytes, uncompressed if they are an EC point.

getNamedCurveByOid

public static X9ECParameters getNamedCurveByOid(ASN1ObjectIdentifier oid)

getNamedCurveByName

public static X9ECParameters getNamedCurveByName(String curveName)

getCurveName

public static String getCurveName(ASN1ObjectIdentifier oid)

privateKeyToString

public static String privateKeyToString(String algorithm,
 BigInteger d,
 ECParameterSpec spec)

publicKeyToString

public static String publicKeyToString(String algorithm,
 ECPoint q,
 ECParameterSpec spec)

generateKeyFingerprint

public static String generateKeyFingerprint(ECPoint publicPoint,
 ECParameterSpec spec)

getNameFrom

public static String getNameFrom(AlgorithmParameterSpec paramSpec)

privateKeyHashCode

public static int privateKeyHashCode(BigInteger d,
 ECParameterSpec spec)

Hash code for an EC private scalar derived from the public point and domain parameters.