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package org.bouncycastle.jcajce.spec;
import java.security.spec.AlgorithmParameterSpec;
import java.util.HashMap;
import java.util.Map;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.crypto.engines.GOST28147Engine;
import org.bouncycastle.util.Arrays;
/**
* A parameter spec for the GOST-28147 cipher.
*/
public class GOST28147ParameterSpec
implements AlgorithmParameterSpec
{
private byte[] iv = null;
private byte[] sBox = null;
public GOST28147ParameterSpec(
byte[] sBox)
{
this.sBox = new byte[sBox.length];
System.arraycopy(sBox, 0, this.sBox, 0, sBox.length);
}
public GOST28147ParameterSpec(
byte[] sBox,
byte[] iv)
{
this(sBox);
this.iv = new byte[iv.length];
System.arraycopy(iv, 0, this.iv, 0, iv.length);
}
public GOST28147ParameterSpec(
String sBoxName)
{
this.sBox = GOST28147Engine.getSBox(sBoxName);
}
public GOST28147ParameterSpec(
String sBoxName,
byte[] iv)
{
this(sBoxName);
this.iv = new byte[iv.length];
System.arraycopy(iv, 0, this.iv, 0, iv.length);
}
public GOST28147ParameterSpec(
ASN1ObjectIdentifier sBoxName,
byte[] iv)
{
this(getName(sBoxName));
this.iv = Arrays.clone(iv);
}
public byte[] getSbox()
{
return sBox;
}
/**
* Returns the IV or null if this parameter set does not contain an IV.
*
* @return the IV or null if this parameter set does not contain an IV.
*/
public byte[] getIV()
{
if (iv == null)
{
return null;
}
byte[] tmp = new byte[iv.length];
System.arraycopy(iv, 0, tmp, 0, tmp.length);
return tmp;
}
private static Map oidMappings = new HashMap();
static
{
oidMappings.put(CryptoProObjectIdentifiers.id_Gost28147_89_CryptoPro_A_ParamSet, "E-A");
oidMappings.put(CryptoProObjectIdentifiers.id_Gost28147_89_CryptoPro_B_ParamSet, "E-B");
oidMappings.put(CryptoProObjectIdentifiers.id_Gost28147_89_CryptoPro_C_ParamSet, "E-C");
oidMappings.put(CryptoProObjectIdentifiers.id_Gost28147_89_CryptoPro_D_ParamSet, "E-D");
}
private static String getName(ASN1ObjectIdentifier sBoxOid)
{
String sBoxName = (String)oidMappings.get(sBoxOid);
if (sBoxName == null)
{
throw new IllegalArgumentException("unknown OID: " + sBoxOid);
}
return sBoxName;
}
}
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