1package org.bouncycastle.jcajce.provider.asymmetric.ec;
2
3import java.math.BigInteger;
4import java.security.InvalidKeyException;
5import java.security.PublicKey;
6import java.security.spec.ECGenParameterSpec;
7import java.security.spec.ECParameterSpec;
8
9import org.bouncycastle.asn1.ASN1ObjectIdentifier;
10import org.bouncycastle.asn1.DERNull;
11import org.bouncycastle.asn1.x9.X962Parameters;
12import org.bouncycastle.asn1.x9.X9ECParameters;
13import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
14import org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util;
15import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
16import org.bouncycastle.jce.spec.ECNamedCurveSpec;
17import org.bouncycastle.math.ec.ECCurve;
18
19class ECUtils
20{
21    static AsymmetricKeyParameter generatePublicKeyParameter(
22            PublicKey key)
23        throws InvalidKeyException
24    {
25        return (key instanceof BCECPublicKey) ? ((BCECPublicKey)key).engineGetKeyParameters() : ECUtil.generatePublicKeyParameter(key);
26    }
27
28    static X9ECParameters getDomainParametersFromGenSpec(ECGenParameterSpec genSpec)
29    {
30        return getDomainParametersFromName(genSpec.getName());
31    }
32
33    static X9ECParameters getDomainParametersFromName(String curveName)
34    {
35        X9ECParameters domainParameters;
36        try
37        {
38            if (curveName.charAt(0) >= '0' && curveName.charAt(0) <= '2')
39            {
40                ASN1ObjectIdentifier oidID = new ASN1ObjectIdentifier(curveName);
41                domainParameters = ECUtil.getNamedCurveByOid(oidID);
42            }
43            else
44            {
45                if (curveName.indexOf(' ') > 0)
46                {
47                    curveName = curveName.substring(curveName.indexOf(' ') + 1);
48                    domainParameters = ECUtil.getNamedCurveByName(curveName);
49                }
50                else
51                {
52                    domainParameters = ECUtil.getNamedCurveByName(curveName);
53                }
54            }
55        }
56        catch (IllegalArgumentException ex)
57        {
58            domainParameters = ECUtil.getNamedCurveByName(curveName);
59        }
60        return domainParameters;
61    }
62
63    static X962Parameters getDomainParametersFromName(ECParameterSpec ecSpec, boolean withCompression)
64    {
65        X962Parameters params;
66
67        if (ecSpec instanceof ECNamedCurveSpec)
68        {
69            ASN1ObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((ECNamedCurveSpec)ecSpec).getName());
70            if (curveOid == null)
71            {
72                curveOid = new ASN1ObjectIdentifier(((ECNamedCurveSpec)ecSpec).getName());
73            }
74            params = new X962Parameters(curveOid);
75        }
76        else if (ecSpec == null)
77        {
78            params = new X962Parameters(DERNull.INSTANCE);
79        }
80        else
81        {
82            ECCurve curve = EC5Util.convertCurve(ecSpec.getCurve());
83
84            X9ECParameters ecP = new X9ECParameters(
85                curve,
86                EC5Util.convertPoint(curve, ecSpec.getGenerator(), withCompression),
87                ecSpec.getOrder(),
88                BigInteger.valueOf(ecSpec.getCofactor()),
89                ecSpec.getCurve().getSeed());
90
91            params = new X962Parameters(ecP);
92        }
93
94        return params;
95    }
96}
97