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package org.spongycastle.operator.bc;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.nist.NISTObjectIdentifiers;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.crypto.params.KeyParameter;
class AESUtil
{
static AlgorithmIdentifier determineKeyEncAlg(KeyParameter key)
{
int length = key.getKey().length * 8;
ASN1ObjectIdentifier wrapOid;
if (length == 128)
{
wrapOid = NISTObjectIdentifiers.id_aes128_wrap;
}
else if (length == 192)
{
wrapOid = NISTObjectIdentifiers.id_aes192_wrap;
}
else if (length == 256)
{
wrapOid = NISTObjectIdentifiers.id_aes256_wrap;
}
else
{
throw new IllegalArgumentException("illegal keysize in AES");
}
return new AlgorithmIdentifier(wrapOid); // parameters absent
}
}
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