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package org.bouncycastle.jcajce.util;
import java.io.IOException;
import java.security.AlgorithmParameters;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
/**
* General JCA/JCE utility methods.
*/
public class JcaJceUtils
{
private JcaJceUtils()
{
}
/**
* Extract an ASN.1 encodable from an AlgorithmParameters object.
*
* @param params the object to get the encoding used to create the return value.
* @return an ASN.1 object representing the primitives making up the params parameter.
* @throws IOException if an encoding cannot be extracted.
*/
public static ASN1Encodable extractParameters(AlgorithmParameters params)
throws IOException
{
// we try ASN.1 explicitly first just in case and then role back to the default.
ASN1Encodable asn1Params;
try
{
asn1Params = ASN1Primitive.fromByteArray(params.getEncoded("ASN.1"));
}
catch (Exception ex)
{
asn1Params = ASN1Primitive.fromByteArray(params.getEncoded());
}
return asn1Params;
}
/**
* Load an AlgorithmParameters object with the passed in ASN.1 encodable - if possible.
*
* @param params the AlgorithmParameters object to be initialised.
* @param sParams the ASN.1 encodable to initialise params with.
* @throws IOException if the parameters cannot be initialised.
*/
public static void loadParameters(AlgorithmParameters params, ASN1Encodable sParams)
throws IOException
{
// we try ASN.1 explicitly first just in case and then role back to the default.
try
{
params.init(sParams.toASN1Primitive().getEncoded(), "ASN.1");
}
catch (Exception ex)
{
params.init(sParams.toASN1Primitive().getEncoded());
}
}
/**
* Attempt to find a standard JCA name for the digest represented by the past in OID.
*
* @param digestAlgOID the OID of the digest algorithm of interest.
* @return a string representing the standard name - the OID as a string if none available.
*/
public static String getDigestAlgName(
ASN1ObjectIdentifier digestAlgOID)
{
if (PKCSObjectIdentifiers.md5.equals(digestAlgOID))
{
return "MD5";
}
else if (OIWObjectIdentifiers.idSHA1.equals(digestAlgOID))
{
return "SHA1";
}
else if (NISTObjectIdentifiers.id_sha224.equals(digestAlgOID))
{
return "SHA224";
}
else if (NISTObjectIdentifiers.id_sha256.equals(digestAlgOID))
{
return "SHA256";
}
else if (NISTObjectIdentifiers.id_sha384.equals(digestAlgOID))
{
return "SHA384";
}
else if (NISTObjectIdentifiers.id_sha512.equals(digestAlgOID))
{
return "SHA512";
}
else if (TeleTrusTObjectIdentifiers.ripemd128.equals(digestAlgOID))
{
return "RIPEMD128";
}
else if (TeleTrusTObjectIdentifiers.ripemd160.equals(digestAlgOID))
{
return "RIPEMD160";
}
else if (TeleTrusTObjectIdentifiers.ripemd256.equals(digestAlgOID))
{
return "RIPEMD256";
}
else if (CryptoProObjectIdentifiers.gostR3411.equals(digestAlgOID))
{
return "GOST3411";
}
else
{
return digestAlgOID.getId();
}
}
}
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