90 lines
3.3 KiB
Java
90 lines
3.3 KiB
Java
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package org.bouncycastle.crypto.generators;
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import org.bouncycastle.crypto.DataLengthException;
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import org.bouncycastle.crypto.DerivationParameters;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.crypto.DigestDerivationFunction;
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import org.bouncycastle.crypto.params.ISO18033KDFParameters;
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import org.bouncycastle.crypto.params.KDFParameters;
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import org.bouncycastle.util.Pack;
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/* loaded from: classes6.dex */
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public class BaseKDFBytesGenerator implements DigestDerivationFunction {
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private int counterStart;
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private Digest digest;
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private byte[] iv;
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private byte[] shared;
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@Override // org.bouncycastle.crypto.DerivationFunction
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public void init(DerivationParameters derivationParameters) {
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if (derivationParameters instanceof KDFParameters) {
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KDFParameters kDFParameters = (KDFParameters) derivationParameters;
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this.shared = kDFParameters.getSharedSecret();
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this.iv = kDFParameters.getIV();
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} else {
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if (!(derivationParameters instanceof ISO18033KDFParameters)) {
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throw new IllegalArgumentException("KDF parameters required for generator");
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}
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this.shared = ((ISO18033KDFParameters) derivationParameters).getSeed();
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this.iv = null;
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}
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}
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@Override // org.bouncycastle.crypto.DigestDerivationFunction
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public Digest getDigest() {
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return this.digest;
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}
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@Override // org.bouncycastle.crypto.DerivationFunction
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public int generateBytes(byte[] bArr, int i, int i2) throws DataLengthException, IllegalArgumentException {
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int i3 = i2;
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int i4 = i;
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if (bArr.length - i3 < i4) {
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throw new DataLengthException("output buffer too small");
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}
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long j = i3;
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int digestSize = this.digest.getDigestSize();
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if (j > 8589934591L) {
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throw new IllegalArgumentException("Output length too large");
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}
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long j2 = digestSize;
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int i5 = (int) (((j + j2) - 1) / j2);
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byte[] bArr2 = new byte[this.digest.getDigestSize()];
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byte[] bArr3 = new byte[4];
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Pack.intToBigEndian(this.counterStart, bArr3, 0);
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int i6 = this.counterStart & (-256);
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for (int i7 = 0; i7 < i5; i7++) {
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Digest digest = this.digest;
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byte[] bArr4 = this.shared;
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digest.update(bArr4, 0, bArr4.length);
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this.digest.update(bArr3, 0, 4);
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byte[] bArr5 = this.iv;
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if (bArr5 != null) {
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this.digest.update(bArr5, 0, bArr5.length);
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}
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this.digest.doFinal(bArr2, 0);
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if (i3 > digestSize) {
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System.arraycopy(bArr2, 0, bArr, i4, digestSize);
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i4 += digestSize;
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i3 -= digestSize;
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} else {
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System.arraycopy(bArr2, 0, bArr, i4, i3);
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}
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byte b = (byte) (bArr3[3] + 1);
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bArr3[3] = b;
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if (b == 0) {
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i6 += 256;
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Pack.intToBigEndian(i6, bArr3, 0);
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}
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}
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this.digest.reset();
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return (int) j;
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}
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/* JADX INFO: Access modifiers changed from: protected */
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public BaseKDFBytesGenerator(int i, Digest digest) {
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this.counterStart = i;
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this.digest = digest;
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}
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}
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