95 lines
3.2 KiB
Java
95 lines
3.2 KiB
Java
package org.bouncycastle.crypto.generators;
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import org.bouncycastle.crypto.CipherParameters;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.crypto.Mac;
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import org.bouncycastle.crypto.PBEParametersGenerator;
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import org.bouncycastle.crypto.digests.SHA1Digest;
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import org.bouncycastle.crypto.macs.HMac;
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import org.bouncycastle.crypto.params.KeyParameter;
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import org.bouncycastle.crypto.params.ParametersWithIV;
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import org.bouncycastle.util.Arrays;
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/* loaded from: classes6.dex */
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public class PKCS5S2ParametersGenerator extends PBEParametersGenerator {
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private Mac hMac;
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private byte[] state;
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@Override // org.bouncycastle.crypto.PBEParametersGenerator
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public CipherParameters generateDerivedParameters(int i, int i2) {
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int i3 = i / 8;
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int i4 = i2 / 8;
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byte[] generateDerivedKey = generateDerivedKey(i3 + i4);
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return new ParametersWithIV(new KeyParameter(generateDerivedKey, 0, i3), generateDerivedKey, i3, i4);
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}
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@Override // org.bouncycastle.crypto.PBEParametersGenerator
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public CipherParameters generateDerivedParameters(int i) {
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int i2 = i / 8;
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return new KeyParameter(Arrays.copyOfRange(generateDerivedKey(i2), 0, i2), 0, i2);
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}
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@Override // org.bouncycastle.crypto.PBEParametersGenerator
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public CipherParameters generateDerivedMacParameters(int i) {
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return generateDerivedParameters(i);
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}
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private byte[] generateDerivedKey(int i) {
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int i2;
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int macSize = this.hMac.getMacSize();
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int i3 = ((i + macSize) - 1) / macSize;
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byte[] bArr = new byte[4];
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byte[] bArr2 = new byte[i3 * macSize];
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this.hMac.init(new KeyParameter(this.password));
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int i4 = 0;
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for (int i5 = 1; i5 <= i3; i5++) {
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while (true) {
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byte b = (byte) (bArr[i2] + 1);
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bArr[i2] = b;
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i2 = b == 0 ? i2 - 1 : 3;
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}
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F(this.salt, this.iterationCount, bArr, bArr2, i4);
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i4 += macSize;
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}
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return bArr2;
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}
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private void F(byte[] bArr, int i, byte[] bArr2, byte[] bArr3, int i2) {
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if (i == 0) {
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throw new IllegalArgumentException("iteration count must be at least 1.");
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}
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if (bArr != null) {
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this.hMac.update(bArr, 0, bArr.length);
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}
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this.hMac.update(bArr2, 0, bArr2.length);
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this.hMac.doFinal(this.state, 0);
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byte[] bArr4 = this.state;
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System.arraycopy(bArr4, 0, bArr3, i2, bArr4.length);
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for (int i3 = 1; i3 < i; i3++) {
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Mac mac = this.hMac;
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byte[] bArr5 = this.state;
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mac.update(bArr5, 0, bArr5.length);
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this.hMac.doFinal(this.state, 0);
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int i4 = 0;
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while (true) {
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byte[] bArr6 = this.state;
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if (i4 != bArr6.length) {
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int i5 = i2 + i4;
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bArr3[i5] = (byte) (bArr6[i4] ^ bArr3[i5]);
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i4++;
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}
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}
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}
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}
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public PKCS5S2ParametersGenerator(Digest digest) {
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HMac hMac = new HMac(digest);
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this.hMac = hMac;
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this.state = new byte[hMac.getMacSize()];
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}
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public PKCS5S2ParametersGenerator() {
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this(new SHA1Digest());
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}
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}
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