static PbeParametersGenerator MakePbeGenerator(
string type,
IDigest digest,
byte[] key,
byte[] salt,
int iterationCount)
{
PbeParametersGenerator generator;
if (type.Equals(Pkcs5S1))
{
generator = new Pkcs5S1ParametersGenerator(digest);
}
else if (type.Equals(Pkcs5S2))
{
generator = new Pkcs5S2ParametersGenerator();
}
else if (type.Equals(Pkcs12))
{
generator = new Pkcs12ParametersGenerator(digest);
}
else if (type.Equals(OpenSsl))
{
generator = new OpenSslPbeParametersGenerator();
}
else
{
throw new ArgumentException("Unknown PBE type: " + type, "type");
}
generator.Init(key, salt, iterationCount);
return generator;
}
private static ICipherParameters GetCipherParameters(
char[] password,
PemBaseAlg baseAlg,
byte[] salt)
{
string algorithm;
int keyBits;
switch (baseAlg)
{
case PemBaseAlg.AES_128: keyBits = 128; algorithm = "AES128"; break;
case PemBaseAlg.AES_192: keyBits = 192; algorithm = "AES192"; break;
case PemBaseAlg.AES_256: keyBits = 256; algorithm = "AES256"; break;
case PemBaseAlg.BF: keyBits = 128; algorithm = "BLOWFISH"; break;
case PemBaseAlg.DES: keyBits = 64; algorithm = "DES"; break;
case PemBaseAlg.DES_EDE: keyBits = 128; algorithm = "DESEDE"; break;
case PemBaseAlg.DES_EDE3: keyBits = 192; algorithm = "DESEDE3"; break;
case PemBaseAlg.RC2: keyBits = 128; algorithm = "RC2"; break;
case PemBaseAlg.RC2_40: keyBits = 40; algorithm = "RC2"; break;
case PemBaseAlg.RC2_64: keyBits = 64; algorithm = "RC2"; break;
default:
return null;
}
OpenSslPbeParametersGenerator pGen = new OpenSslPbeParametersGenerator();
pGen.Init(PbeParametersGenerator.Pkcs5PasswordToBytes(password), salt);
return pGen.GenerateDerivedParameters(algorithm, keyBits);
}
