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org.apache.poi.poifs.crypt.agile
Class AgileDecryptor

java.lang.Object
  extended by org.apache.poi.poifs.crypt.Decryptor
      extended by org.apache.poi.poifs.crypt.agile.AgileDecryptor

public class AgileDecryptor
extends Decryptor

Decryptor implementation for Agile Encryption

Field Summary
protected static byte[] kCryptoKeyBlock
           
protected static byte[] kHashedVerifierBlock
           
protected static byte[] kIntegrityKeyBlock
           
protected static byte[] kIntegrityValueBlock
           
protected static byte[] kVerifierInputBlock
           
 
Fields inherited from class org.apache.poi.poifs.crypt.Decryptor
builder, DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY
 
Constructor Summary
protected AgileDecryptor(AgileEncryptionInfoBuilder builder)
           
 
Method Summary
 java.io.InputStream getDataStream(DirectoryNode dir)
           
 long getLength()
           
protected static int getNextBlockSize(int inputLen, int blockSize)
           
protected static byte[] hashInput(EncryptionInfoBuilder builder, byte[] pwHash, byte[] blockKey, byte[] inputKey, int cipherMode)
           
protected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher existing, int block, boolean lastChunk, EncryptionInfoBuilder builder, javax.crypto.SecretKey skey, int encryptionMode)
           
 boolean verifyPassword(java.security.KeyPair keyPair, java.security.cert.X509Certificate x509)
          instead of a password, it's also possible to decrypt via certificate.
 boolean verifyPassword(java.lang.String password)
          set decryption password
 
Methods inherited from class org.apache.poi.poifs.crypt.Decryptor
getBlockSizeInBytes, getDataStream, getDataStream, getDataStream, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

kVerifierInputBlock

protected static final byte[] kVerifierInputBlock

kHashedVerifierBlock

protected static final byte[] kHashedVerifierBlock

kCryptoKeyBlock

protected static final byte[] kCryptoKeyBlock

kIntegrityKeyBlock

protected static final byte[] kIntegrityKeyBlock

kIntegrityValueBlock

protected static final byte[] kIntegrityValueBlock
Constructor Detail

AgileDecryptor

protected AgileDecryptor(AgileEncryptionInfoBuilder builder)
Method Detail

verifyPassword

public boolean verifyPassword(java.lang.String password)
                       throws java.security.GeneralSecurityException
set decryption password

Specified by:
verifyPassword in class Decryptor
Throws:
java.security.GeneralSecurityException

verifyPassword

public boolean verifyPassword(java.security.KeyPair keyPair,
                              java.security.cert.X509Certificate x509)
                       throws java.security.GeneralSecurityException
instead of a password, it's also possible to decrypt via certificate. Warning: this code is experimental and hasn't been validated

Parameters:
keyPair -
x509 -
Returns:
true, when the data can be successfully decrypted with the given private key
Throws:
java.security.GeneralSecurityException
See Also:
Agile encryption with certificates

getNextBlockSize

protected static int getNextBlockSize(int inputLen,
                                      int blockSize)

hashInput

protected static byte[] hashInput(EncryptionInfoBuilder builder,
                                  byte[] pwHash,
                                  byte[] blockKey,
                                  byte[] inputKey,
                                  int cipherMode)

getDataStream

public java.io.InputStream getDataStream(DirectoryNode dir)
                                  throws java.io.IOException,
                                         java.security.GeneralSecurityException
Specified by:
getDataStream in class Decryptor
Throws:
java.io.IOException
java.security.GeneralSecurityException

getLength

public long getLength()
Specified by:
getLength in class Decryptor

initCipherForBlock

protected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher existing,
                                                        int block,
                                                        boolean lastChunk,
                                                        EncryptionInfoBuilder builder,
                                                        javax.crypto.SecretKey skey,
                                                        int encryptionMode)
                                                 throws java.security.GeneralSecurityException
Throws:
java.security.GeneralSecurityException
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