// 
// Decompiled by Procyon v0.6.0
// 

package com.google.crypto.tink.aead.subtle;

import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.security.InvalidAlgorithmParameterException;
import com.google.crypto.tink.subtle.AesGcmJce;
import com.google.crypto.tink.Aead;
import java.security.GeneralSecurityException;
import com.google.errorprone.annotations.Immutable;

@Immutable
public final class AesGcmFactory implements AeadFactory
{
    private final int keySizeInBytes;
    
    public AesGcmFactory(final int keySizeInBytes) throws GeneralSecurityException {
        this.keySizeInBytes = validateAesKeySize(keySizeInBytes);
    }
    
    @Override
    public int getKeySizeInBytes() {
        return this.keySizeInBytes;
    }
    
    @Override
    public Aead createAead(final byte[] symmetricKey) throws GeneralSecurityException {
        if (symmetricKey.length != this.getKeySizeInBytes()) {
            throw new GeneralSecurityException(String.format("Symmetric key has incorrect length; expected %s, but got %s", this.getKeySizeInBytes(), symmetricKey.length));
        }
        return new AesGcmJce(symmetricKey);
    }
    
    @CanIgnoreReturnValue
    private static int validateAesKeySize(final int sizeInBytes) throws InvalidAlgorithmParameterException {
        if (sizeInBytes != 16 && sizeInBytes != 32) {
            throw new InvalidAlgorithmParameterException(String.format("Invalid AES key size, expected 16 or 32, but got %d", sizeInBytes));
        }
        return sizeInBytes;
    }
}