|
static private FindECCurveByOid ( |
||
| oid | ||
| return | ||
public void Init(KeyGenerationParameters parameters)
{
if (parameters is ECKeyGenerationParameters)
{
ECKeyGenerationParameters eCKeyGenerationParameters = (ECKeyGenerationParameters)parameters;
this.publicKeyParamSet = eCKeyGenerationParameters.PublicKeyParamSet;
this.parameters = eCKeyGenerationParameters.DomainParameters;
}
else
{
int strength = parameters.Strength;
DerObjectIdentifier oid;
if (strength <= 239)
{
if (strength == 192)
{
oid = X9ObjectIdentifiers.Prime192v1;
goto IL_AA;
}
if (strength == 224)
{
oid = SecObjectIdentifiers.SecP224r1;
goto IL_AA;
}
if (strength == 239)
{
oid = X9ObjectIdentifiers.Prime239v1;
goto IL_AA;
}
}
else
{
if (strength == 256)
{
oid = X9ObjectIdentifiers.Prime256v1;
goto IL_AA;
}
if (strength == 384)
{
oid = SecObjectIdentifiers.SecP384r1;
goto IL_AA;
}
if (strength == 521)
{
oid = SecObjectIdentifiers.SecP521r1;
goto IL_AA;
}
}
throw new InvalidParameterException("unknown key size.");
IL_AA:
X9ECParameters x9ECParameters = ECKeyPairGenerator.FindECCurveByOid(oid);
this.parameters = new ECDomainParameters(x9ECParameters.Curve, x9ECParameters.G, x9ECParameters.N, x9ECParameters.H, x9ECParameters.GetSeed());
}
this.random = parameters.Random;
if (this.random == null)
{
this.random = new SecureRandom();
}
}