Package com.dracoon.sdk.crypto.internal

Class AesGcmFileDecryptionCipher

java.lang.Object

com.dracoon.sdk.crypto.internal.AesGcmFileCipher

com.dracoon.sdk.crypto.internal.AesGcmFileDecryptionCipher

All Implemented Interfaces:

FileDecryptionCipher

public class AesGcmFileDecryptionCipher
extends AesGcmFileCipher
implements FileDecryptionCipher

Field Summary

Fields inherited from class com.dracoon.sdk.crypto.internal.AesGcmFileCipher

BLOCK_SIZE, realCipher, TAG_SIZE

Constructor Summary

Constructors

Constructor	Description
AesGcmFileDecryptionCipher(PlainFileKey fileKey)

Method Summary

Modifier and Type	Method	Description
PlainDataContainer	doFinal(EncryptedDataContainer encData)	Completes the decryption and verifies the integrity of decrypted bytes. After this method is called no further calls of processBytes and doFinal are possible.
PlainDataContainer	processBytes(EncryptedDataContainer encData)	Decrypts some bytes. IMPORTANT!!!: After all encrypted bytes have been processed, doFinal must be called to complete the decryption.

Methods inherited from class com.dracoon.sdk.crypto.internal.AesGcmFileCipher

init, process

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AesGcmFileDecryptionCipher

public AesGcmFileDecryptionCipher(PlainFileKey fileKey)
                           throws CryptoSystemException

Throws:

CryptoSystemException

Method Details

processBytes

public PlainDataContainer processBytes(EncryptedDataContainer encData)
                                throws IllegalArgumentException,
IllegalStateException,
CryptoSystemException

Description copied from interface: FileDecryptionCipher

Decrypts some bytes.

IMPORTANT!!!: After all encrypted bytes have been processed, doFinal must be called to complete the decryption. As long as the decryption is not finished, the integrity of the decrypted bytes is not guaranteed!

Specified by:

processBytes in interface FileDecryptionCipher

Parameters:

encData - The data container with the bytes to decrypt.

Returns:

The data container with the decrypted bytes.

Throws:

IllegalArgumentException - If the data container is invalid.

IllegalStateException - If the cipher is in an inappropriate state.

CryptoSystemException - If a unknown error occurred.

doFinal

public PlainDataContainer doFinal(EncryptedDataContainer encData)
                           throws BadFileException,
IllegalArgumentException,
IllegalStateException,
CryptoSystemException

Description copied from interface: FileDecryptionCipher

Completes the decryption and verifies the integrity of decrypted bytes.

After this method is called no further calls of processBytes and doFinal are possible.

Specified by:

doFinal in interface FileDecryptionCipher

Parameters:

encData - The data container with the previously calculated tag.

Returns:

The data container with the decrypted bytes.

Throws:

BadFileException - If the file content has been modified.

IllegalArgumentException - If the data container is invalid.

IllegalStateException - If the cipher is in an inappropriate state.

CryptoSystemException - If a unknown error occurred.