42 lines
1.4 KiB
Java
42 lines
1.4 KiB
Java
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package org.bouncycastle.crypto.paddings;
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import com.google.common.primitives.UnsignedBytes;
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import java.security.SecureRandom;
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import org.bouncycastle.crypto.InvalidCipherTextException;
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/* loaded from: classes6.dex */
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public class PKCS7Padding implements BlockCipherPadding {
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@Override // org.bouncycastle.crypto.paddings.BlockCipherPadding
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public void init(SecureRandom secureRandom) throws IllegalArgumentException {
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}
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@Override // org.bouncycastle.crypto.paddings.BlockCipherPadding
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public int padCount(byte[] bArr) throws InvalidCipherTextException {
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int i = bArr[bArr.length - 1] & UnsignedBytes.MAX_VALUE;
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byte b = (byte) i;
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boolean z = (i > bArr.length) | (i == 0);
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for (int i2 = 0; i2 < bArr.length; i2++) {
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z |= (bArr.length - i2 <= i) & (bArr[i2] != b);
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}
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if (z) {
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throw new InvalidCipherTextException("pad block corrupted");
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}
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return i;
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}
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@Override // org.bouncycastle.crypto.paddings.BlockCipherPadding
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public String getPaddingName() {
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return "PKCS7";
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}
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@Override // org.bouncycastle.crypto.paddings.BlockCipherPadding
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public int addPadding(byte[] bArr, int i) {
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byte length = (byte) (bArr.length - i);
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while (i < bArr.length) {
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bArr[i] = length;
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i++;
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}
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return length;
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}
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}
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