本文整理汇总了Java中org.spongycastle.math.ec.ECFieldElement类的典型用法代码示例。如果您正苦于以下问题：Java ECFieldElement类的具体用法？Java ECFieldElement怎么用？Java ECFieldElement使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
ECFieldElement类属于org.spongycastle.math.ec包，在下文中一共展示了ECFieldElement类的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: byteArrayToECPoint
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
private static ECPoint byteArrayToECPoint(final byte[] value, final ECCurve.Fp curve)
throws IllegalArgumentException {
final byte[] x = new byte[(value.length - 1) / 2];
final byte[] y = new byte[(value.length - 1) / 2];
if (value[0] != (byte) 0x04) {
throw new IllegalArgumentException("No uncompressed Point found!"); //$NON-NLS-1$
}
System.arraycopy(value, 1, x, 0, (value.length - 1) / 2);
System.arraycopy(value, 1 + (value.length - 1) / 2, y, 0,
(value.length - 1) / 2);
final ECFieldElement.Fp xE = (org.spongycastle.math.ec.ECFieldElement.Fp) curve.fromBigInteger(new BigInteger(1, x));
final ECFieldElement.Fp yE = (org.spongycastle.math.ec.ECFieldElement.Fp) curve.fromBigInteger(new BigInteger(1, y));
final ECPoint point = curve.createPoint(xE.toBigInteger(), yE.toBigInteger());
return point;
}
示例2: decompressKey
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
/** Decompress a compressed public key (x co-ord and low-bit of y-coord). */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
// This code is adapted from Bouncy Castle ECCurve.Fp.decodePoint(), but it wasn't easily re-used.
ECCurve.Fp curve = (ECCurve.Fp) ecParams.getCurve();
ECFieldElement x = new ECFieldElement.Fp(curve.getQ(), xBN);
ECFieldElement alpha = x.multiply(x.square().add(curve.getA())).add(curve.getB());
ECFieldElement beta = alpha.sqrt();
// If we can't find a sqrt we haven't got a point on the curve - invalid inputs.
if (beta == null)
throw new IllegalArgumentException("Invalid point compression");
if (beta.toBigInteger().testBit(0) == yBit) {
return new ECPoint.Fp(curve, x, beta, true);
} else {
ECFieldElement.Fp y = new ECFieldElement.Fp(curve.getQ(), curve.getQ().subtract(beta.toBigInteger()));
return new ECPoint.Fp(curve, x, y, true);
}
}
示例3: decompressKey
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
/** Decompress a compressed public key (x co-ord and low-bit of y-coord). */
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
// This code is adapted from Bouncy Castle ECCurve.Fp.decodePoint(), but it wasn't easily re-used.
ECCurve.Fp curve = (ECCurve.Fp) CURVE.getCurve();
ECFieldElement x = new ECFieldElement.Fp(curve.getQ(), xBN);
ECFieldElement alpha = x.multiply(x.square().add(curve.getA())).add(curve.getB());
ECFieldElement beta = alpha.sqrt();
// If we can't find a sqrt we haven't got a point on the curve - invalid inputs.
if (beta == null)
throw new IllegalArgumentException("Invalid point compression");
if (beta.toBigInteger().testBit(0) == yBit) {
return new ECPoint.Fp(curve, x, beta, true);
} else {
ECFieldElement.Fp y = new ECFieldElement.Fp(curve.getQ(), curve.getQ().subtract(beta.toBigInteger()));
return new ECPoint.Fp(curve, x, y, true);
}
}
示例4: decompressKey
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
/**
* Decompress a compressed public key (x co-ord and low-bit of y-coord).
*/
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
// This code is adapted from Bouncy Castle ECCurve.Fp.decodePoint(), but it wasn't easily re-used.
ECCurve.Fp curve = (ECCurve.Fp) ecParams.getCurve();
ECFieldElement x = new ECFieldElement.Fp(curve.getQ(), xBN);
ECFieldElement alpha = x.multiply(x.square().add(curve.getA())).add(curve.getB());
ECFieldElement beta = alpha.sqrt();
// If we can't find a sqrt we haven't got a point on the curve - invalid inputs.
if (beta == null)
throw new IllegalArgumentException("Invalid point compression");
if (beta.toBigInteger().testBit(0) == yBit) {
return new ECPoint.Fp(curve, x, beta, true);
} else {
ECFieldElement.Fp y = new ECFieldElement.Fp(curve.getQ(), curve.getQ().subtract(beta.toBigInteger()));
return new ECPoint.Fp(curve, x, y, true);
}
}
示例5: computeAffineY
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
private static BigInteger computeAffineY(final BigInteger affineX, final ECParameterSpec params) {
final ECCurve bcCurve = toBouncyCastleECCurve(params);
final ECFieldElement a = bcCurve.getA();
final ECFieldElement b = bcCurve.getB();
final ECFieldElement x = bcCurve.fromBigInteger(affineX);
final ECFieldElement y = x.multiply(x).add(a).multiply(x).add(b).sqrt();
return y.toBigInteger();
}
示例6: computeAffineY
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
private static BigInteger computeAffineY(final BigInteger affineX, final ECParameterSpec params) {
final ECCurve bcCurve = toSpongyCastleECCurve(params);
final ECFieldElement a = bcCurve.getA();
final ECFieldElement b = bcCurve.getB();
final ECFieldElement x = bcCurve.fromBigInteger(affineX);
final ECFieldElement y = x.multiply(x).add(a).multiply(x).add(b).sqrt();
return y.toBigInteger();
}
示例7: getYCoord
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement getYCoord() {
return get().getYCoord();
}
示例8: getZCoords
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement[] getZCoords() {
return get().getZCoords();
}
示例9: scaleY
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECPoint scaleY(ECFieldElement scale) {
return get().scaleY(scale);
}
示例10: getXCoord
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement getXCoord() {
return get().getXCoord();
}
示例11: scaleX
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECPoint scaleX(ECFieldElement scale) {
return get().scaleX(scale);
}
示例12: getZCoord
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement getZCoord(int index) {
return get().getZCoord(index);
}
示例13: getY
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement getY() {
return this.normalize().getYCoord();
}
示例14: getAffineYCoord
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement getAffineYCoord() {
return get().getAffineYCoord();
}
示例15: getAffineXCoord
import org.spongycastle.math.ec.ECFieldElement; //导入依赖的package包/类
public ECFieldElement getAffineXCoord() {
return get().getAffineXCoord();
}