| public static GetCanonicalAlgorithmName ( string algorithm ) : string | ||
| algorithm | string | |
| return | string | |
public static Asn1Encodable GenerateParameters(string algorithm, SecureRandom random)
{
if (algorithm == null)
{
throw new ArgumentNullException("algorithm");
}
string canonicalAlgorithmName = ParameterUtilities.GetCanonicalAlgorithmName(algorithm);
if (canonicalAlgorithmName == null)
{
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
int num = ParameterUtilities.FindBasicIVSize(canonicalAlgorithmName);
if (num != -1)
{
return(ParameterUtilities.CreateIVOctetString(random, num));
}
if (canonicalAlgorithmName == "CAST5")
{
return(new Cast5CbcParameters(ParameterUtilities.CreateIV(random, 8), 128));
}
if (canonicalAlgorithmName == "IDEA")
{
return(new IdeaCbcPar(ParameterUtilities.CreateIV(random, 8)));
}
if (canonicalAlgorithmName == "RC2")
{
return(new RC2CbcParameter(ParameterUtilities.CreateIV(random, 8)));
}
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
public static KeyParameter CreateKeyParameter(string algorithm, byte[] keyBytes, int offset, int length)
{
if (algorithm == null)
{
throw new ArgumentNullException("algorithm");
}
string canonicalAlgorithmName = ParameterUtilities.GetCanonicalAlgorithmName(algorithm);
if (canonicalAlgorithmName == null)
{
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
if (canonicalAlgorithmName == "DES")
{
return(new DesParameters(keyBytes, offset, length));
}
if (canonicalAlgorithmName == "DESEDE" || canonicalAlgorithmName == "DESEDE3")
{
return(new DesEdeParameters(keyBytes, offset, length));
}
if (canonicalAlgorithmName == "RC2")
{
return(new RC2Parameters(keyBytes, offset, length));
}
return(new KeyParameter(keyBytes, offset, length));
}
public static ICipherParameters GetCipherParameters(string algorithm, ICipherParameters key, Asn1Object asn1Params)
{
if (algorithm == null)
{
throw new ArgumentNullException("algorithm");
}
string canonicalAlgorithmName = ParameterUtilities.GetCanonicalAlgorithmName(algorithm);
if (canonicalAlgorithmName == null)
{
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
byte[] array = null;
try
{
int num = ParameterUtilities.FindBasicIVSize(canonicalAlgorithmName);
if (num != -1 || canonicalAlgorithmName == "RIJNDAEL" || canonicalAlgorithmName == "SKIPJACK" || canonicalAlgorithmName == "TWOFISH")
{
array = ((Asn1OctetString)asn1Params).GetOctets();
}
else if (canonicalAlgorithmName == "CAST5")
{
array = Cast5CbcParameters.GetInstance(asn1Params).GetIV();
}
else if (canonicalAlgorithmName == "IDEA")
{
array = IdeaCbcPar.GetInstance(asn1Params).GetIV();
}
else if (canonicalAlgorithmName == "RC2")
{
array = RC2CbcParameter.GetInstance(asn1Params).GetIV();
}
}
catch (Exception innerException)
{
throw new ArgumentException("Could not process ASN.1 parameters", innerException);
}
if (array != null)
{
return(new ParametersWithIV(key, array));
}
throw new SecurityUtilityException("Algorithm " + algorithm + " not recognised.");
}
