org.bouncycastle.cms
public class CMSEnvelopedDataParser extends CMSContentInfoParser
Note: that because we are in a streaming mode only one recipient can be tried and it is important that the methods on the parser are called in the appropriate order.
Example of use - assuming the first recipient matches the private key we have.
CMSEnvelopedDataParser ep = new CMSEnvelopedDataParser(inputStream); RecipientInformationStore recipients = ep.getRecipientInfos(); Collection c = recipients.getRecipients(); Iterator it = c.iterator(); if (it.hasNext()) { RecipientInformation recipient = (RecipientInformation)it.next(); CMSTypedStream recData = recipient.getContentStream(privateKey, "BC"); processDataStream(recData.getContentStream()); }Note: this class does not introduce buffering - if you are processing large files you should create the parser with:
CMSEnvelopedDataParser ep = new CMSEnvelopedDataParser(new BufferedInputStream(inputStream, bufSize));where bufSize is a suitably large buffer size.
Constructor Summary | |
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CMSEnvelopedDataParser(byte[] envelopedData) | |
CMSEnvelopedDataParser(InputStream envelopedData) |
Method Summary | |
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AlgorithmParameters | getEncryptionAlgorithmParameters(String provider)
Return an AlgorithmParameters object giving the encryption parameters
used to encrypt the message content.
|
String | getEncryptionAlgOID()
return the object identifier for the content encryption algorithm. |
byte[] | getEncryptionAlgParams()
return the ASN.1 encoded encryption algorithm parameters, or null if
there aren't any. |
RecipientInformationStore | getRecipientInfos()
return a store of the intended recipients for this message |
AttributeTable | getUnprotectedAttributes()
return a table of the unprotected attributes indexed by
the OID of the attribute. |
Parameters: provider the provider to generate the parameters for.
Returns: the parameters object, null if there is not one.
Throws: CMSException if the algorithm cannot be found, or the parameters can't be parsed. NoSuchProviderException if the provider cannot be found.
Throws: IOException