100 lines
3.8 KiB
Java
100 lines
3.8 KiB
Java
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package org.bouncycastle.crypto.agreement.kdf;
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import java.io.IOException;
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import org.bouncycastle.asn1.ASN1EncodableVector;
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import org.bouncycastle.asn1.ASN1Encoding;
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import org.bouncycastle.asn1.ASN1ObjectIdentifier;
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import org.bouncycastle.asn1.DEROctetString;
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import org.bouncycastle.asn1.DERSequence;
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import org.bouncycastle.asn1.DERTaggedObject;
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import org.bouncycastle.crypto.DataLengthException;
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import org.bouncycastle.crypto.DerivationFunction;
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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.util.Pack;
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/* loaded from: classes6.dex */
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public class DHKEKGenerator implements DerivationFunction {
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private ASN1ObjectIdentifier algorithm;
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private final Digest digest;
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private int keySize;
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private byte[] partyAInfo;
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private byte[] z;
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@Override // org.bouncycastle.crypto.DerivationFunction
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public void init(DerivationParameters derivationParameters) {
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DHKDFParameters dHKDFParameters = (DHKDFParameters) derivationParameters;
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this.algorithm = dHKDFParameters.getAlgorithm();
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this.keySize = dHKDFParameters.getKeySize();
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this.z = dHKDFParameters.getZ();
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this.partyAInfo = dHKDFParameters.getExtraInfo();
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}
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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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boolean z;
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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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int i6 = 0;
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int i7 = 0;
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int i8 = 1;
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while (i7 < i5) {
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Digest digest = this.digest;
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byte[] bArr3 = this.z;
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digest.update(bArr3, i6, bArr3.length);
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ASN1EncodableVector aSN1EncodableVector = new ASN1EncodableVector();
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ASN1EncodableVector aSN1EncodableVector2 = new ASN1EncodableVector();
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aSN1EncodableVector2.add(this.algorithm);
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aSN1EncodableVector2.add(new DEROctetString(Pack.intToBigEndian(i8)));
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aSN1EncodableVector.add(new DERSequence(aSN1EncodableVector2));
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if (this.partyAInfo != null) {
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z = true;
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aSN1EncodableVector.add(new DERTaggedObject(true, i6, new DEROctetString(this.partyAInfo)));
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} else {
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z = true;
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}
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aSN1EncodableVector.add(new DERTaggedObject(z, 2, new DEROctetString(Pack.intToBigEndian(this.keySize))));
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try {
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byte[] encoded = new DERSequence(aSN1EncodableVector).getEncoded(ASN1Encoding.DER);
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this.digest.update(encoded, 0, encoded.length);
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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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i8++;
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i7++;
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i6 = 0;
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} catch (IOException e) {
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StringBuilder sb = new StringBuilder("unable to encode parameter info: ");
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sb.append(e.getMessage());
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throw new IllegalArgumentException(sb.toString());
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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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public DHKEKGenerator(Digest digest) {
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this.digest = digest;
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}
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}
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