本文整理匯總了Java中java.security.spec.EllipticCurve.getB方法的典型用法代碼示例。如果您正苦於以下問題:Java EllipticCurve.getB方法的具體用法?Java EllipticCurve.getB怎麽用?Java EllipticCurve.getB使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類java.security.spec.EllipticCurve
的用法示例。
在下文中一共展示了EllipticCurve.getB方法的12個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: convertCurve
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
private static ECCurve convertCurve(
EllipticCurve ec)
{
ECField field = ec.getField();
BigInteger a = ec.getA();
BigInteger b = ec.getB();
if (field instanceof ECFieldFp)
{
return new ECCurve.Fp(((ECFieldFp)field).getP(), a, b);
}
else
{
throw new IllegalStateException("not implemented yet!!!");
}
}
示例2: convertCurve
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
public static ECCurve convertCurve(
EllipticCurve ec)
{
ECField field = ec.getField();
BigInteger a = ec.getA();
BigInteger b = ec.getB();
if (field instanceof ECFieldFp)
{
return new ECCurve.Fp(((ECFieldFp)field).getP(), a, b);
}
else
{
ECFieldF2m fieldF2m = (ECFieldF2m)field;
int m = fieldF2m.getM();
int ks[] = ECUtil.convertMidTerms(fieldF2m.getMidTermsOfReductionPolynomial());
return new ECCurve.F2m(m, ks[0], ks[1], ks[2], a, b);
}
}
示例3: mapNonceGMWithECDH
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
private static ECParameterSpec mapNonceGMWithECDH(final BigInteger nonceS,
final ECPoint sharedSecretPointH,
final ECParameterSpec params) {
// D~ = (p, a, b, G~, n, h) where G~ = [s]G + H
final ECPoint generator = params.getGenerator();
final EllipticCurve curve = params.getCurve();
final BigInteger a = curve.getA();
final BigInteger b = curve.getB();
final ECFieldFp field = (ECFieldFp)curve.getField();
final BigInteger p = field.getP();
final BigInteger order = params.getOrder();
final int cofactor = params.getCofactor();
final ECPoint ephemeralGenerator = add(multiply(nonceS, generator, params), sharedSecretPointH, params);
if (!toBouncyCastleECPoint(ephemeralGenerator, params).isValid()) {
LOGGER.warning("Se ha generado un punto invalido"); //$NON-NLS-1$
}
return new ECParameterSpec(new EllipticCurve(new ECFieldFp(p), a, b), ephemeralGenerator, order, cofactor);
}
示例4: mapNonceGMWithECDH
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
private static ECParameterSpec mapNonceGMWithECDH(final BigInteger nonceS,
final ECPoint sharedSecretPointH,
final ECParameterSpec params) {
// D~ = (p, a, b, G~, n, h) where G~ = [s]G + H
final ECPoint generator = params.getGenerator();
final EllipticCurve curve = params.getCurve();
final BigInteger a = curve.getA();
final BigInteger b = curve.getB();
final ECFieldFp field = (ECFieldFp)curve.getField();
final BigInteger p = field.getP();
final BigInteger order = params.getOrder();
final int cofactor = params.getCofactor();
final ECPoint ephemeralGenerator = add(multiply(nonceS, generator, params), sharedSecretPointH, params);
if (!toSpongyCastleECPoint(ephemeralGenerator, params).isValid()) {
LOGGER.warning("Se ha generado un punto invalido"); //$NON-NLS-1$
}
return new ECParameterSpec(new EllipticCurve(new ECFieldFp(p), a, b), ephemeralGenerator, order, cofactor);
}
示例5: convertCurve
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
private static ECCurve convertCurve(
EllipticCurve ec, BigInteger order, int coFactor)
{
ECField field = ec.getField();
BigInteger a = ec.getA();
BigInteger b = ec.getB();
if (field instanceof ECFieldFp)
{
return new ECCurve.Fp(((ECFieldFp)field).getP(), a, b, order, BigInteger.valueOf(coFactor));
}
else
{
throw new IllegalStateException("not implemented yet!!!");
}
}
示例6: convertCurve
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
public static ECCurve convertCurve(
EllipticCurve ec)
{
ECField field = ec.getField();
BigInteger a = ec.getA();
BigInteger b = ec.getB();
if (field instanceof ECFieldFp)
{
ECCurve.Fp curve = new ECCurve.Fp(((ECFieldFp)field).getP(), a, b);
if (customCurves.containsKey(curve))
{
return (ECCurve)customCurves.get(curve);
}
return curve;
}
else
{
ECFieldF2m fieldF2m = (ECFieldF2m)field;
int m = fieldF2m.getM();
int ks[] = ECUtil.convertMidTerms(fieldF2m.getMidTermsOfReductionPolynomial());
return new ECCurve.F2m(m, ks[0], ks[1], ks[2], a, b);
}
}
示例7: decodePoint
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
/**
* Decode a point on this curve which has been encoded using point
* compression (X9.62 s 4.2.1 and 4.2.2) or regular encoding.
*
* @param curve
* The elliptic curve.
* @param encoded
* The encoded point.
* @return the decoded point.
*/
public static ECPoint decodePoint(
EllipticCurve curve,
byte[] encoded)
{
ECCurve c = null;
if (curve.getField() instanceof ECFieldFp)
{
c = new ECCurve.Fp(
((ECFieldFp)curve.getField()).getP(), curve.getA(), curve.getB());
}
else
{
int k[] = ((ECFieldF2m)curve.getField()).getMidTermsOfReductionPolynomial();
if (k.length == 3)
{
c = new ECCurve.F2m(
((ECFieldF2m)curve.getField()).getM(), k[2], k[1], k[0], curve.getA(), curve.getB());
}
else
{
c = new ECCurve.F2m(
((ECFieldF2m)curve.getField()).getM(), k[0], curve.getA(), curve.getB());
}
}
org.bouncycastle.math.ec.ECPoint p = c.decodePoint(encoded);
return new ECPoint(p.getX().toBigInteger(), p.getY().toBigInteger());
}
示例8: toBouncyCastleECCurve
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
private static ECCurve toBouncyCastleECCurve(final ECParameterSpec params) {
final EllipticCurve curve = params.getCurve();
final ECField field = curve.getField();
if (!(field instanceof ECFieldFp)) {
throw new IllegalArgumentException(
"Solo se soporta 'ECFieldFp' y se proporciono " + field.getClass().getCanonicalName() //$NON-NLS-1$
);
}
final int coFactor = params.getCofactor();
final BigInteger order = params.getOrder();
final BigInteger a = curve.getA();
final BigInteger b = curve.getB();
final BigInteger p = getPrime(params);
return new ECCurve.Fp(p, a, b, order, BigInteger.valueOf(coFactor));
}
示例9: toSpongyCastleECCurve
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
private static ECCurve toSpongyCastleECCurve(final ECParameterSpec params) {
final EllipticCurve curve = params.getCurve();
final ECField field = curve.getField();
if (!(field instanceof ECFieldFp)) {
throw new IllegalArgumentException(
"Solo se soporta 'ECFieldFp' y se proporciono " + field.getClass().getCanonicalName() //$NON-NLS-1$
);
}
final int coFactor = params.getCofactor();
final BigInteger order = params.getOrder();
final BigInteger a = curve.getA();
final BigInteger b = curve.getB();
final BigInteger p = getPrime(params);
return new ECCurve.Fp(p, a, b, order, BigInteger.valueOf(coFactor));
}
示例10: decodePoint
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
/**
* Decode a point on this curve which has been encoded using point
* compression (X9.62 s 4.2.1 and 4.2.2) or regular encoding.
*
* @param curve
* The elliptic curve.
* @param encoded
* The encoded point.
* @return the decoded point.
*/
public static ECPoint decodePoint(
EllipticCurve curve,
byte[] encoded)
{
ECCurve c = null;
if (curve.getField() instanceof ECFieldFp)
{
c = new ECCurve.Fp(
((ECFieldFp)curve.getField()).getP(), curve.getA(), curve.getB());
}
else
{
int k[] = ((ECFieldF2m)curve.getField()).getMidTermsOfReductionPolynomial();
if (k.length == 3)
{
c = new ECCurve.F2m(
((ECFieldF2m)curve.getField()).getM(), k[2], k[1], k[0], curve.getA(), curve.getB());
}
else
{
c = new ECCurve.F2m(
((ECFieldF2m)curve.getField()).getM(), k[0], curve.getA(), curve.getB());
}
}
org.bouncycastle.math.ec.ECPoint p = c.decodePoint(encoded);
return new ECPoint(p.getAffineXCoord().toBigInteger(), p.getAffineYCoord().toBigInteger());
}
示例11: decodePoint
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
/**
* Decode a point on this curve which has been encoded using point
* compression (X9.62 s 4.2.1 and 4.2.2) or regular encoding.
*
* @param curve
* The elliptic curve.
* @param encoded
* The encoded point.
* @return the decoded point.
*/
public static ECPoint decodePoint(
EllipticCurve curve,
byte[] encoded)
{
ECCurve c = null;
if (curve.getField() instanceof ECFieldFp)
{
c = new ECCurve.Fp(
((ECFieldFp)curve.getField()).getP(), curve.getA(), curve.getB());
}
else
{
int k[] = ((ECFieldF2m)curve.getField()).getMidTermsOfReductionPolynomial();
if (k.length == 3)
{
c = new ECCurve.F2m(
((ECFieldF2m)curve.getField()).getM(), k[2], k[1], k[0], curve.getA(), curve.getB());
}
else
{
c = new ECCurve.F2m(
((ECFieldF2m)curve.getField()).getM(), k[0], curve.getA(), curve.getB());
}
}
org.ripple.bouncycastle.math.ec.ECPoint p = c.decodePoint(encoded);
return new ECPoint(p.getAffineXCoord().toBigInteger(), p.getAffineYCoord().toBigInteger());
}
示例12: getY
import java.security.spec.EllipticCurve; //導入方法依賴的package包/類
/**
* Computes the y coordinate of a point on an elliptic curve. This method can be used to
* decompress elliptic curve points.
*
* @param x the x-coordinate of the point
* @param lsb the least significant bit of the y-coordinate of the point.
* @param curve this must be an elliptic curve over a prime field using Weierstrass
* representation.
* @return the y coordinate.
* @throws GeneralSecurityException if there is no point with coordinate x on the curve, or if
* curve is not supported.
*/
public static BigInteger getY(BigInteger x, boolean lsb, EllipticCurve curve)
throws GeneralSecurityException {
BigInteger p = getModulus(curve);
BigInteger a = curve.getA();
BigInteger b = curve.getB();
BigInteger rhs = x.multiply(x).add(a).multiply(x).add(b).mod(p);
BigInteger y = modSqrt(rhs, p);
if (lsb != y.testBit(0)) {
y = p.subtract(y).mod(p);
}
return y;
}