68 lines
3.6 KiB
Java
68 lines
3.6 KiB
Java
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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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import org.bouncycastle.pqc.math.linearalgebra.PolynomialRingGF2m;
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/* loaded from: classes6.dex */
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public class McElieceKeyPairGenerator implements AsymmetricCipherKeyPairGenerator {
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private static final String OID = "1.3.6.1.4.1.8301.3.1.3.4.1";
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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 McElieceKeyGenerationParameters mcElieceParams;
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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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initialize(keyGenerationParameters);
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}
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public AsymmetricCipherKeyPair generateKeyPair() {
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return genKeyPair();
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}
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private void initializeDefault() {
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initialize(new McElieceKeyGenerationParameters(new SecureRandom(), new McElieceParameters()));
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}
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private void initialize(KeyGenerationParameters keyGenerationParameters) {
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this.mcElieceParams = (McElieceKeyGenerationParameters) keyGenerationParameters;
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this.random = new SecureRandom();
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this.m = this.mcElieceParams.getParameters().getM();
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this.n = this.mcElieceParams.getParameters().getN();
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this.t = this.mcElieceParams.getParameters().getT();
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this.fieldPoly = this.mcElieceParams.getParameters().getFieldPoly();
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this.initialized = true;
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}
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private AsymmetricCipherKeyPair genKeyPair() {
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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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new PolynomialRingGF2m(gF2mField, polynomialGF2mSmallM).getSquareRootMatrix();
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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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GF2Matrix extendLeftCompactForm = gF2Matrix.extendLeftCompactForm();
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int numRows = gF2Matrix.getNumRows();
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GF2Matrix[] createRandomRegularMatrixAndItsInverse = GF2Matrix.createRandomRegularMatrixAndItsInverse(numRows, this.random);
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Permutation permutation2 = new Permutation(this.n, this.random);
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return new AsymmetricCipherKeyPair((AsymmetricKeyParameter) new McEliecePublicKeyParameters(this.n, this.t, (GF2Matrix) ((GF2Matrix) createRandomRegularMatrixAndItsInverse[0].rightMultiply(extendLeftCompactForm)).rightMultiply(permutation2)), (AsymmetricKeyParameter) new McEliecePrivateKeyParameters(this.n, numRows, gF2mField, polynomialGF2mSmallM, permutation, permutation2, createRandomRegularMatrixAndItsInverse[1]));
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}
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}
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