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Bouncy Castle Cryptography 1.46 | ||||||||
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java.lang.Object org.bouncycastle.cms.CMSContentInfoParser org.bouncycastle.cms.CMSAuthenticatedDataParser
public class CMSAuthenticatedDataParser
Parsing class for an CMS Authenticated Data object from an input stream.
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.
CMSAuthenticatedDataParser ad = new CMSAuthenticatedDataParser(inputStream); RecipientInformationStore recipients = ad.getRecipientInfos(); Collection c = recipients.getRecipients(); Iterator it = c.iterator(); if (it.hasNext()) { RecipientInformation recipient = (RecipientInformation)it.next(); CMSTypedStream recData = recipient.getContentStream(new JceKeyTransAuthenticatedRecipient(privateKey).setProvider("BC")); processDataStream(recData.getContentStream()); if (!Arrays.equals(ad.getMac(), recipient.getMac()) { System.err.println("Data corrupted!!!!"); } }Note: this class does not introduce buffering - if you are processing large files you should create the parser with:
CMSAuthenticatedDataParser ep = new CMSAuthenticatedDataParser(new BufferedInputStream(inputStream, bufSize));where bufSize is a suitably large buffer size.
Field Summary |
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Fields inherited from class org.bouncycastle.cms.CMSContentInfoParser |
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_contentInfo, _data |
Constructor Summary | |
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CMSAuthenticatedDataParser(byte[] envelopedData)
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CMSAuthenticatedDataParser(byte[] envelopedData,
org.bouncycastle.operator.DigestCalculatorProvider digestCalculatorProvider)
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CMSAuthenticatedDataParser(java.io.InputStream envelopedData)
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CMSAuthenticatedDataParser(java.io.InputStream envelopedData,
org.bouncycastle.operator.DigestCalculatorProvider digestCalculatorProvider)
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Method Summary | |
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AttributeTable |
getAuthAttrs()
return a table of the unauthenticated attributes indexed by the OID of the attribute. |
byte[] |
getContentDigest()
This will only be valid after the content has been read. |
byte[] |
getMac()
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java.lang.String |
getMacAlgOID()
return the object identifier for the mac algorithm. |
java.security.AlgorithmParameters |
getMacAlgorithmParameters(java.security.Provider provider)
Return an AlgorithmParameters object giving the encryption parameters used to encrypt the message content. |
java.security.AlgorithmParameters |
getMacAlgorithmParameters(java.lang.String provider)
Return an AlgorithmParameters object giving the encryption parameters used to encrypt the message content. |
byte[] |
getMacAlgParams()
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 |
getUnauthAttrs()
return a table of the unauthenticated attributes indexed by the OID of the attribute. |
Methods inherited from class org.bouncycastle.cms.CMSContentInfoParser |
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close |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CMSAuthenticatedDataParser(byte[] envelopedData) throws CMSException, java.io.IOException
CMSException
java.io.IOException
public CMSAuthenticatedDataParser(byte[] envelopedData, org.bouncycastle.operator.DigestCalculatorProvider digestCalculatorProvider) throws CMSException, java.io.IOException
CMSException
java.io.IOException
public CMSAuthenticatedDataParser(java.io.InputStream envelopedData) throws CMSException, java.io.IOException
CMSException
java.io.IOException
public CMSAuthenticatedDataParser(java.io.InputStream envelopedData, org.bouncycastle.operator.DigestCalculatorProvider digestCalculatorProvider) throws CMSException, java.io.IOException
CMSException
java.io.IOException
Method Detail |
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public java.lang.String getMacAlgOID()
public byte[] getMacAlgParams()
public java.security.AlgorithmParameters getMacAlgorithmParameters(java.lang.String provider) throws CMSException, java.security.NoSuchProviderException
provider
- the name of the provider to generate the parameters for.
CMSException
- if the algorithm cannot be found, or the parameters can't be parsed.
java.security.NoSuchProviderException
- if the provider cannot be found.public java.security.AlgorithmParameters getMacAlgorithmParameters(java.security.Provider provider) throws CMSException
provider
- the provider to generate the parameters for.
CMSException
- if the algorithm cannot be found, or the parameters can't be parsed.public RecipientInformationStore getRecipientInfos()
public byte[] getMac() throws java.io.IOException
java.io.IOException
public AttributeTable getAuthAttrs() throws java.io.IOException
java.io.IOException
public AttributeTable getUnauthAttrs() throws java.io.IOException
java.io.IOException
public byte[] getContentDigest()
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