59 lines
2.5 KiB
Java
59 lines
2.5 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.DERNull;
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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.asn1.x509.AlgorithmIdentifier;
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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.generators.KDF2BytesGenerator;
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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 ECDHKEKGenerator implements DigestDerivationFunction {
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private ASN1ObjectIdentifier algorithm;
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private DigestDerivationFunction kdf;
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private int keySize;
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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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}
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@Override // org.bouncycastle.crypto.DigestDerivationFunction
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public Digest getDigest() {
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return this.kdf.getDigest();
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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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ASN1EncodableVector aSN1EncodableVector = new ASN1EncodableVector();
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aSN1EncodableVector.add(new AlgorithmIdentifier(this.algorithm, DERNull.INSTANCE));
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aSN1EncodableVector.add(new DERTaggedObject(true, 2, new DEROctetString(Pack.intToBigEndian(this.keySize))));
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try {
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this.kdf.init(new KDFParameters(this.z, new DERSequence(aSN1EncodableVector).getEncoded(ASN1Encoding.DER)));
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return this.kdf.generateBytes(bArr, i, i2);
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} catch (IOException e) {
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StringBuilder sb = new StringBuilder("unable to initialise kdf: ");
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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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public ECDHKEKGenerator(Digest digest) {
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this.kdf = new KDF2BytesGenerator(digest);
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}
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}
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