54 lines
2.9 KiB
Java
54 lines
2.9 KiB
Java
package org.bouncycastle.pqc.crypto.mceliece;
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import java.security.SecureRandom;
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import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
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import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator;
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import org.bouncycastle.crypto.KeyGenerationParameters;
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import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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import org.bouncycastle.pqc.math.linearalgebra.GF2Matrix;
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import org.bouncycastle.pqc.math.linearalgebra.GF2mField;
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import org.bouncycastle.pqc.math.linearalgebra.GoppaCode;
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import org.bouncycastle.pqc.math.linearalgebra.Permutation;
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import org.bouncycastle.pqc.math.linearalgebra.PolynomialGF2mSmallM;
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/* loaded from: classes6.dex */
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public class McElieceCCA2KeyPairGenerator implements AsymmetricCipherKeyPairGenerator {
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public static final String OID = "1.3.6.1.4.1.8301.3.1.3.4.2";
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private int fieldPoly;
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private boolean initialized = false;
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private int m;
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private McElieceCCA2KeyGenerationParameters mcElieceCCA2Params;
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private int n;
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private SecureRandom random;
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private int t;
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public void init(KeyGenerationParameters keyGenerationParameters) {
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this.mcElieceCCA2Params = (McElieceCCA2KeyGenerationParameters) keyGenerationParameters;
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this.random = new SecureRandom();
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this.m = this.mcElieceCCA2Params.getParameters().getM();
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this.n = this.mcElieceCCA2Params.getParameters().getN();
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this.t = this.mcElieceCCA2Params.getParameters().getT();
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this.fieldPoly = this.mcElieceCCA2Params.getParameters().getFieldPoly();
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this.initialized = true;
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}
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public AsymmetricCipherKeyPair generateKeyPair() {
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if (!this.initialized) {
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initializeDefault();
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}
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GF2mField gF2mField = new GF2mField(this.m, this.fieldPoly);
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PolynomialGF2mSmallM polynomialGF2mSmallM = new PolynomialGF2mSmallM(gF2mField, this.t, 'I', this.random);
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GoppaCode.MaMaPe computeSystematicForm = GoppaCode.computeSystematicForm(GoppaCode.createCanonicalCheckMatrix(gF2mField, polynomialGF2mSmallM), this.random);
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GF2Matrix secondMatrix = computeSystematicForm.getSecondMatrix();
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Permutation permutation = computeSystematicForm.getPermutation();
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GF2Matrix gF2Matrix = (GF2Matrix) secondMatrix.computeTranspose();
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return new AsymmetricCipherKeyPair((AsymmetricKeyParameter) new McElieceCCA2PublicKeyParameters(this.n, this.t, gF2Matrix, this.mcElieceCCA2Params.getParameters().getDigest()), (AsymmetricKeyParameter) new McElieceCCA2PrivateKeyParameters(this.n, gF2Matrix.getNumRows(), gF2mField, polynomialGF2mSmallM, permutation, this.mcElieceCCA2Params.getParameters().getDigest()));
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}
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private void initializeDefault() {
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init(new McElieceCCA2KeyGenerationParameters(new SecureRandom(), new McElieceCCA2Parameters()));
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}
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}
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