100 lines
3.9 KiB
Java
100 lines
3.9 KiB
Java
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package org.bouncycastle.crypto.signers;
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import java.io.IOException;
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import java.math.BigInteger;
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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.ASN1Integer;
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import org.bouncycastle.asn1.ASN1Primitive;
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import org.bouncycastle.asn1.ASN1Sequence;
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import org.bouncycastle.asn1.DERSequence;
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import org.bouncycastle.crypto.CipherParameters;
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import org.bouncycastle.crypto.DSA;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.crypto.Signer;
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import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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import org.bouncycastle.crypto.params.ParametersWithRandom;
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/* loaded from: classes6.dex */
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public class DSADigestSigner implements Signer {
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private final Digest digest;
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private final DSA dsaSigner;
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private boolean forSigning;
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@Override // org.bouncycastle.crypto.Signer
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public boolean verifySignature(byte[] bArr) {
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if (this.forSigning) {
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throw new IllegalStateException("DSADigestSigner not initialised for verification");
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}
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byte[] bArr2 = new byte[this.digest.getDigestSize()];
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this.digest.doFinal(bArr2, 0);
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try {
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BigInteger[] derDecode = derDecode(bArr);
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return this.dsaSigner.verifySignature(bArr2, derDecode[0], derDecode[1]);
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} catch (IOException unused) {
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return false;
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}
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}
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@Override // org.bouncycastle.crypto.Signer
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public void update(byte[] bArr, int i, int i2) {
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this.digest.update(bArr, i, i2);
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}
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@Override // org.bouncycastle.crypto.Signer
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public void update(byte b) {
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this.digest.update(b);
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}
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@Override // org.bouncycastle.crypto.Signer
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public void reset() {
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this.digest.reset();
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}
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@Override // org.bouncycastle.crypto.Signer
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public void init(boolean z, CipherParameters cipherParameters) {
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this.forSigning = z;
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AsymmetricKeyParameter asymmetricKeyParameter = cipherParameters instanceof ParametersWithRandom ? (AsymmetricKeyParameter) ((ParametersWithRandom) cipherParameters).getParameters() : (AsymmetricKeyParameter) cipherParameters;
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if (z && !asymmetricKeyParameter.isPrivate()) {
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throw new IllegalArgumentException("Signing Requires Private Key.");
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}
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if (!z && asymmetricKeyParameter.isPrivate()) {
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throw new IllegalArgumentException("Verification Requires Public Key.");
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}
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reset();
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this.dsaSigner.init(z, cipherParameters);
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}
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@Override // org.bouncycastle.crypto.Signer
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public byte[] generateSignature() {
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if (!this.forSigning) {
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throw new IllegalStateException("DSADigestSigner not initialised for signature generation.");
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}
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byte[] bArr = new byte[this.digest.getDigestSize()];
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this.digest.doFinal(bArr, 0);
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BigInteger[] generateSignature = this.dsaSigner.generateSignature(bArr);
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try {
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return derEncode(generateSignature[0], generateSignature[1]);
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} catch (IOException unused) {
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throw new IllegalStateException("unable to encode signature");
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}
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}
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private byte[] derEncode(BigInteger bigInteger, BigInteger bigInteger2) throws IOException {
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ASN1EncodableVector aSN1EncodableVector = new ASN1EncodableVector();
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aSN1EncodableVector.add(new ASN1Integer(bigInteger));
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aSN1EncodableVector.add(new ASN1Integer(bigInteger2));
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return new DERSequence(aSN1EncodableVector).getEncoded(ASN1Encoding.DER);
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}
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private BigInteger[] derDecode(byte[] bArr) throws IOException {
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ASN1Sequence aSN1Sequence = (ASN1Sequence) ASN1Primitive.fromByteArray(bArr);
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return new BigInteger[]{((ASN1Integer) aSN1Sequence.getObjectAt(0)).getValue(), ((ASN1Integer) aSN1Sequence.getObjectAt(1)).getValue()};
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}
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public DSADigestSigner(DSA dsa, Digest digest) {
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this.digest = digest;
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this.dsaSigner = dsa;
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}
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}
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