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package org.bouncycastle.jcajce.provider.asymmetric.rsa;
import java.math.BigInteger;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
import org.bouncycastle.util.Fingerprint;
/**
* utility class for converting java.security RSA objects into their
* org.bouncycastle.crypto counterparts.
*/
public class RSAUtil
{
public static final ASN1ObjectIdentifier[] rsaOids =
{
PKCSObjectIdentifiers.rsaEncryption,
X509ObjectIdentifiers.id_ea_rsa,
PKCSObjectIdentifiers.id_RSAES_OAEP,
PKCSObjectIdentifiers.id_RSASSA_PSS
};
public static boolean isRsaOid(
ASN1ObjectIdentifier algOid)
{
for (int i = 0; i != rsaOids.length; i++)
{
if (algOid.equals(rsaOids[i]))
{
return true;
}
}
return false;
}
static RSAKeyParameters generatePublicKeyParameter(
RSAPublicKey key)
{
return new RSAKeyParameters(false, key.getModulus(), key.getPublicExponent());
}
static RSAKeyParameters generatePrivateKeyParameter(
RSAPrivateKey key)
{
if (key instanceof RSAPrivateCrtKey)
{
RSAPrivateCrtKey k = (RSAPrivateCrtKey)key;
return new RSAPrivateCrtKeyParameters(k.getModulus(),
k.getPublicExponent(), k.getPrivateExponent(),
k.getPrimeP(), k.getPrimeQ(), k.getPrimeExponentP(), k.getPrimeExponentQ(), k.getCrtCoefficient());
}
else
{
RSAPrivateKey k = key;
return new RSAKeyParameters(true, k.getModulus(), k.getPrivateExponent());
}
}
static String generateKeyFingerprint(BigInteger modulus)
{
return new Fingerprint(modulus.toByteArray()).toString();
}
static String generateExponentFingerprint(BigInteger exponent)
{
return new Fingerprint(exponent.toByteArray(), 32).toString();
}
}
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