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package org.spongycastle.cms;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Encoding;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.util.io.Streams;
public abstract class RecipientInformation
{
protected RecipientId rid;
protected AlgorithmIdentifier keyEncAlg;
protected AlgorithmIdentifier messageAlgorithm;
protected CMSSecureReadable secureReadable;
private AuthAttributesProvider additionalData;
private byte[] resultMac;
private RecipientOperator operator;
RecipientInformation(
AlgorithmIdentifier keyEncAlg,
AlgorithmIdentifier messageAlgorithm,
CMSSecureReadable secureReadable,
AuthAttributesProvider additionalData)
{
this.keyEncAlg = keyEncAlg;
this.messageAlgorithm = messageAlgorithm;
this.secureReadable = secureReadable;
this.additionalData = additionalData;
}
public RecipientId getRID()
{
return rid;
}
private byte[] encodeObj(
ASN1Encodable obj)
throws IOException
{
if (obj != null)
{
return obj.toASN1Primitive().getEncoded();
}
return null;
}
/**
* Return the key encryption algorithm details for the key in this recipient.
*
* @return AlgorithmIdentifier representing the key encryption algorithm.
*/
public AlgorithmIdentifier getKeyEncryptionAlgorithm()
{
return keyEncAlg;
}
/**
* return the object identifier for the key encryption algorithm.
*
* @return OID for key encryption algorithm.
*/
public String getKeyEncryptionAlgOID()
{
return keyEncAlg.getAlgorithm().getId();
}
/**
* return the ASN.1 encoded key encryption algorithm parameters, or null if
* there aren't any.
*
* @return ASN.1 encoding of key encryption algorithm parameters.
*/
public byte[] getKeyEncryptionAlgParams()
{
try
{
return encodeObj(keyEncAlg.getParameters());
}
catch (Exception e)
{
throw new RuntimeException("exception getting encryption parameters " + e);
}
}
/**
* Return the content digest calculated during the read of the content if one has been generated. This will
* only happen if we are dealing with authenticated data and authenticated attributes are present.
*
* @return byte array containing the digest.
*/
public byte[] getContentDigest()
{
if (secureReadable instanceof CMSEnvelopedHelper.CMSDigestAuthenticatedSecureReadable)
{
return ((CMSEnvelopedHelper.CMSDigestAuthenticatedSecureReadable)secureReadable).getDigest();
}
return null;
}
/**
* Return the MAC calculated for the recipient. Note: this call is only meaningful once all
* the content has been read.
*
* @return byte array containing the mac.
*/
public byte[] getMac()
{
if (resultMac == null)
{
if (operator.isMacBased())
{
if (additionalData != null)
{
try
{
Streams.drain(operator.getInputStream(new ByteArrayInputStream(additionalData.getAuthAttributes().getEncoded(ASN1Encoding.DER))));
}
catch (IOException e)
{
throw new IllegalStateException("unable to drain input: " + e.getMessage());
}
}
resultMac = operator.getMac();
}
}
return resultMac;
}
/**
* Return the decrypted/encapsulated content in the EnvelopedData after recovering the content
* encryption/MAC key using the passed in Recipient.
*
* @param recipient recipient object to use to recover content encryption key
* @return the content inside the EnvelopedData this RecipientInformation is associated with.
* @throws CMSException if the content-encryption/MAC key cannot be recovered.
*/
public byte[] getContent(
Recipient recipient)
throws CMSException
{
try
{
return CMSUtils.streamToByteArray(getContentStream(recipient).getContentStream());
}
catch (IOException e)
{
throw new CMSException("unable to parse internal stream: " + e.getMessage(), e);
}
}
/**
* Return a CMSTypedStream representing the content in the EnvelopedData after recovering the content
* encryption/MAC key using the passed in Recipient.
*
* @param recipient recipient object to use to recover content encryption key
* @return the content inside the EnvelopedData this RecipientInformation is associated with.
* @throws CMSException if the content-encryption/MAC key cannot be recovered.
*/
public CMSTypedStream getContentStream(Recipient recipient)
throws CMSException, IOException
{
operator = getRecipientOperator(recipient);
if (additionalData != null)
{
return new CMSTypedStream(secureReadable.getInputStream());
}
return new CMSTypedStream(operator.getInputStream(secureReadable.getInputStream()));
}
protected abstract RecipientOperator getRecipientOperator(Recipient recipient)
throws CMSException, IOException;
}
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