package com.google.android.gms.internal.ads;

import androidx.annotation.Nullable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/* JADX INFO: loaded from: classes2.dex */
public abstract class yj {

    @Nullable
    private static MessageDigest zzb;

    /* JADX INFO: renamed from: a, reason: collision with root package name */
    public final Object f18851a = new Object();

    public abstract byte[] a(String str);

    @Nullable
    public final MessageDigest zzb() {
        synchronized (this.f18851a) {
            MessageDigest messageDigest = zzb;
            if (messageDigest != null) {
                return messageDigest;
            }
            for (int i10 = 0; i10 < 2; i10++) {
                try {
                    zzb = MessageDigest.getInstance("MD5");
                } catch (NoSuchAlgorithmException unused) {
                }
            }
            return zzb;
        }
    }
}