?? eckeypairgenerator.java
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package org.bouncycastle.crypto.generators;import java.math.BigInteger;import java.security.SecureRandom;import org.bouncycastle.crypto.AsymmetricCipherKeyPair;import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator;import org.bouncycastle.crypto.KeyGenerationParameters;import org.bouncycastle.crypto.params.ECDomainParameters;import org.bouncycastle.crypto.params.ECKeyGenerationParameters;import org.bouncycastle.crypto.params.ECPrivateKeyParameters;import org.bouncycastle.crypto.params.ECPublicKeyParameters;import org.bouncycastle.math.ec.ECConstants;import org.bouncycastle.math.ec.ECPoint;public class ECKeyPairGenerator implements AsymmetricCipherKeyPairGenerator, ECConstants{ ECDomainParameters params; SecureRandom random; public void init( KeyGenerationParameters param) { ECKeyGenerationParameters ecP = (ECKeyGenerationParameters)param; this.random = ecP.getRandom(); this.params = ecP.getDomainParameters(); } /** * Given the domain parameters this routine generates an EC key * pair in accordance with X9.62 section 5.2.1 pages 26, 27. */ public AsymmetricCipherKeyPair generateKeyPair() { BigInteger n = params.getN(); int nBitLength = n.bitLength(); BigInteger d; do { d = new BigInteger(nBitLength, random); } while (d.equals(ZERO) || (d.compareTo(n) >= 0)); ECPoint Q = params.getG().multiply(d); return new AsymmetricCipherKeyPair( new ECPublicKeyParameters(Q, params), new ECPrivateKeyParameters(d, params)); }}?? 快捷鍵說明
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