98 lines
3.2 KiB
Java
98 lines
3.2 KiB
Java
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package org.bouncycastle.crypto.engines;
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import com.google.common.primitives.UnsignedBytes;
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import org.bouncycastle.crypto.CipherParameters;
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import org.bouncycastle.crypto.DataLengthException;
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import org.bouncycastle.crypto.OutputLengthException;
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import org.bouncycastle.crypto.StreamCipher;
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import org.bouncycastle.crypto.params.KeyParameter;
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/* loaded from: classes6.dex */
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public class RC4Engine implements StreamCipher {
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private static final int STATE_LENGTH = 256;
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private byte[] engineState = null;
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private int x = 0;
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private int y = 0;
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private byte[] workingKey = null;
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@Override // org.bouncycastle.crypto.StreamCipher
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public byte returnByte(byte b) {
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int i = (this.x + 1) & 255;
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this.x = i;
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byte[] bArr = this.engineState;
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byte b2 = bArr[i];
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int i2 = (this.y + b2) & 255;
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this.y = i2;
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bArr[i] = bArr[i2];
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bArr[i2] = b2;
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return (byte) (b ^ bArr[(bArr[i] + b2) & 255]);
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}
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@Override // org.bouncycastle.crypto.StreamCipher
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public void reset() {
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setKey(this.workingKey);
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}
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@Override // org.bouncycastle.crypto.StreamCipher
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public int processBytes(byte[] bArr, int i, int i2, byte[] bArr2, int i3) {
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if (i + i2 > bArr.length) {
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throw new DataLengthException("input buffer too short");
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}
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if (i3 + i2 > bArr2.length) {
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throw new OutputLengthException("output buffer too short");
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}
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for (int i4 = 0; i4 < i2; i4++) {
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int i5 = (this.x + 1) & 255;
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this.x = i5;
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byte[] bArr3 = this.engineState;
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byte b = bArr3[i5];
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int i6 = (this.y + b) & 255;
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this.y = i6;
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bArr3[i5] = bArr3[i6];
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bArr3[i6] = b;
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bArr2[i4 + i3] = (byte) (bArr3[(bArr3[i5] + b) & 255] ^ bArr[i4 + i]);
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}
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return i2;
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}
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@Override // org.bouncycastle.crypto.StreamCipher
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public void init(boolean z, CipherParameters cipherParameters) {
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if (!(cipherParameters instanceof KeyParameter)) {
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StringBuilder sb = new StringBuilder("invalid parameter passed to RC4 init - ");
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sb.append(cipherParameters.getClass().getName());
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throw new IllegalArgumentException(sb.toString());
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}
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byte[] key = ((KeyParameter) cipherParameters).getKey();
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this.workingKey = key;
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setKey(key);
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}
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@Override // org.bouncycastle.crypto.StreamCipher
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public String getAlgorithmName() {
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return "RC4";
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}
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private void setKey(byte[] bArr) {
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this.workingKey = bArr;
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this.x = 0;
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this.y = 0;
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if (this.engineState == null) {
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this.engineState = new byte[256];
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}
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for (int i = 0; i < 256; i++) {
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this.engineState[i] = (byte) i;
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}
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int i2 = 0;
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int i3 = 0;
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for (int i4 = 0; i4 < 256; i4++) {
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byte b = bArr[i2];
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byte[] bArr2 = this.engineState;
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byte b2 = bArr2[i4];
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i3 = ((b & UnsignedBytes.MAX_VALUE) + b2 + i3) & 255;
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bArr2[i4] = bArr2[i3];
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bArr2[i3] = b2;
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i2 = (i2 + 1) % bArr.length;
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}
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}
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}
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