package o;

/* loaded from: classes2.dex */
public final class UKk {
    public static byte[] c(byte[] bArr) {
        if (bArr.length != 16) {
            throw new IllegalArgumentException("value must be a block.");
        }
        byte[] bArr2 = new byte[16];
        for (int i = 0; i < 16; i++) {
            byte b = (byte) ((bArr[i] << 1) & 254);
            bArr2[i] = b;
            if (i < 15) {
                bArr2[i] = (byte) (((byte) ((bArr[i + 1] >> 7) & 1)) | b);
            }
        }
        bArr2[15] = (byte) (((byte) ((bArr[0] >> 7) & 135)) ^ bArr2[15]);
        return bArr2;
    }
}