85 lines
3.1 KiB
Java
85 lines
3.1 KiB
Java
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package org.bouncycastle.crypto.tls;
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import java.io.IOException;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.util.Arrays;
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/* loaded from: classes6.dex */
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public class TlsNullCipher implements TlsCipher {
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protected TlsContext context;
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protected TlsMac readMac;
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protected TlsMac writeMac;
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@Override // org.bouncycastle.crypto.tls.TlsCipher
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public int getPlaintextLimit(int i) {
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TlsMac tlsMac = this.writeMac;
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return tlsMac != null ? i - tlsMac.getSize() : i;
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}
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@Override // org.bouncycastle.crypto.tls.TlsCipher
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public byte[] encodePlaintext(long j, short s, byte[] bArr, int i, int i2) throws IOException {
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TlsMac tlsMac = this.writeMac;
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if (tlsMac == null) {
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return Arrays.copyOfRange(bArr, i, i2 + i);
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}
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byte[] calculateMac = tlsMac.calculateMac(j, s, bArr, i, i2);
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byte[] bArr2 = new byte[calculateMac.length + i2];
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System.arraycopy(bArr, i, bArr2, 0, i2);
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System.arraycopy(calculateMac, 0, bArr2, i2, calculateMac.length);
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return bArr2;
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}
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@Override // org.bouncycastle.crypto.tls.TlsCipher
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public byte[] decodeCiphertext(long j, short s, byte[] bArr, int i, int i2) throws IOException {
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TlsMac tlsMac = this.readMac;
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if (tlsMac == null) {
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return Arrays.copyOfRange(bArr, i, i2 + i);
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}
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int size = tlsMac.getSize();
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if (i2 < size) {
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throw new TlsFatalAlert((short) 50);
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}
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int i3 = i2 - size;
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int i4 = i + i3;
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if (Arrays.constantTimeAreEqual(Arrays.copyOfRange(bArr, i4, i2 + i), this.readMac.calculateMac(j, s, bArr, i, i3))) {
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return Arrays.copyOfRange(bArr, i, i4);
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}
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throw new TlsFatalAlert((short) 20);
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}
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public TlsNullCipher(TlsContext tlsContext, Digest digest, Digest digest2) throws IOException {
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TlsMac tlsMac;
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TlsMac tlsMac2;
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if ((digest == null) != (digest2 == null)) {
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throw new TlsFatalAlert((short) 80);
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}
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this.context = tlsContext;
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if (digest != null) {
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int digestSize = digest.getDigestSize() + digest2.getDigestSize();
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byte[] calculateKeyBlock = TlsUtils.calculateKeyBlock(tlsContext, digestSize);
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tlsMac = new TlsMac(tlsContext, digest, calculateKeyBlock, 0, digest.getDigestSize());
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int digestSize2 = digest.getDigestSize();
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tlsMac2 = new TlsMac(tlsContext, digest2, calculateKeyBlock, digestSize2, digest2.getDigestSize());
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if (digestSize2 + digest2.getDigestSize() != digestSize) {
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throw new TlsFatalAlert((short) 80);
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}
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} else {
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tlsMac = null;
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tlsMac2 = null;
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}
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if (tlsContext.isServer()) {
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this.writeMac = tlsMac2;
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this.readMac = tlsMac;
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} else {
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this.writeMac = tlsMac;
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this.readMac = tlsMac2;
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}
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}
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public TlsNullCipher(TlsContext tlsContext) {
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this.context = tlsContext;
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this.writeMac = null;
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this.readMac = null;
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}
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}
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