public ICmsReadable GetReadable(KeyParameter sKey)
{
try
{
this.cipher = CipherUtilities.GetCipher(this.algorithm.ObjectID);
Asn1Encodable asn1Enc = this.algorithm.Parameters;
Asn1Object asn1Params = asn1Enc == null ? null : asn1Enc.ToAsn1Object();
ICipherParameters cipherParameters = sKey;
if (asn1Params != null && !(asn1Params is Asn1Null))
{
cipherParameters = ParameterUtilities.GetCipherParameters(
this.algorithm.ObjectID, cipherParameters, asn1Params);
}
else
{
string alg = this.algorithm.ObjectID.Id;
if (alg.Equals(CmsEnvelopedDataGenerator.DesEde3Cbc) ||
alg.Equals(CmsEnvelopedDataGenerator.IdeaCbc) ||
alg.Equals(CmsEnvelopedDataGenerator.Cast5Cbc))
{
cipherParameters = new ParametersWithIV(cipherParameters, new byte[8]);
}
}
cipher.Init(false, cipherParameters);
}
catch (SecurityUtilityException e)
{
throw new CmsException("couldn't create cipher.", e);
}
catch (InvalidKeyException e)
{
throw new CmsException("key invalid in message.", e);
}
catch (IOException e)
{
throw new CmsException("error decoding algorithm parameters.", e);
}
try
{
return(new CmsProcessableInputStream(
new CipherStream(readable.GetInputStream(), cipher, null)));
}
catch (IOException e)
{
throw new CmsException("error reading content.", e);
}
}
internal CmsTypedStream GetContentFromSessionKey(
KeyParameter sKey)
{
ICmsReadable readable = secureReadable.GetReadable(sKey);
try
{
return(new CmsTypedStream(readable.GetInputStream()));
}
catch (IOException e)
{
throw new CmsException("error getting .", e);
}
}
public ICmsReadable GetReadable(KeyParameter sKey)
{
string macAlg = this.algorithm.ObjectID.Id;
// Asn1Object sParams = this.algorithm.Parameters.ToAsn1Object();
try
{
this.mac = MacUtilities.GetMac(macAlg);
// FIXME Support for MAC algorithm parameters similar to cipher parameters
// ASN1Object sParams = (ASN1Object)macAlg.getParameters();
//
// if (sParams != null && !(sParams instanceof ASN1Null))
// {
// AlgorithmParameters params = CMSEnvelopedHelper.INSTANCE.createAlgorithmParameters(macAlg.getObjectId().getId(), provider);
//
// params.init(sParams.getEncoded(), "ASN.1");
//
// mac.init(sKey, params.getParameterSpec(IvParameterSpec.class));
// }
// else
{
mac.Init(sKey);
}
// Asn1Object asn1Params = asn1Enc == null ? null : asn1Enc.ToAsn1Object();
//
// ICipherParameters cipherParameters = sKey;
//
// if (asn1Params != null && !(asn1Params is Asn1Null))
// {
// cipherParameters = ParameterUtilities.GetCipherParameters(
// macAlg.ObjectID, cipherParameters, asn1Params);
// }
// else
// {
// string alg = macAlg.ObjectID.Id;
// if (alg.Equals(CmsEnvelopedDataGenerator.DesEde3Cbc)
// || alg.Equals(CmsEnvelopedDataGenerator.IdeaCbc)
// || alg.Equals(CmsEnvelopedDataGenerator.Cast5Cbc))
// {
// cipherParameters = new ParametersWithIV(cipherParameters, new byte[8]);
// }
// }
//
// mac.Init(cipherParameters);
}
catch (SecurityUtilityException e)
{
throw new CmsException("couldn't create cipher.", e);
}
catch (InvalidKeyException e)
{
throw new CmsException("key invalid in message.", e);
}
catch (IOException e)
{
throw new CmsException("error decoding algorithm parameters.", e);
}
try
{
return(new CmsProcessableInputStream(
new TeeInputStream(
readable.GetInputStream(),
new MacOutputStream(this.mac))));
}
catch (IOException e)
{
throw new CmsException("error reading content.", e);
}
}