com.amazonaws.encryptionsdk.model

Class CipherFrameHeaders

java.lang.Object

com.amazonaws.encryptionsdk.model.CipherFrameHeaders

public final class CipherFrameHeaders
extends Object

This class implements the headers for the encrypted content stored in a frame. These headers are parsed and used when the encrypted content in the frame is decrypted.

It contains the following fields in order:

1. final sequence number marker if final frame
2. sequence number
3. nonce
4. length of content in frame

Constructor Summary

Constructors

Constructor and Description
CipherFrameHeaders() Default constructor.
CipherFrameHeaders(int sequenceNumber, byte[] nonce, int frameContentLen, boolean isFinal) Construct the frame headers using the provided sequence number, nonce, length of content, and boolean value indicating if it is the final frame.

Method Summary

Modifier and Type	Method and Description
int	deserialize(byte[] b, int off) Deserialize the provided bytes starting at the specified offset to construct an instance of this class.
int	getFrameContentLength() Return the frame content length set in the frame header.
byte[]	getNonce() Return the nonce set in the frame header.
int	getSequenceNumber() Return the frame sequence number set in the frame header.
void	includeFrameSize(boolean value) Set the flag to specify whether the frame length needs to be included or parsed in the header.
boolean	isComplete() Check if this object has all the header fields populated and available for reading.
boolean	isFinalFrame() Return if the frame is a final frame.
void	setNonceLength(short nonceLength) Set the length of the nonce used in the encryption of the content in the frame.
byte[]	toByteArray() Serialize the header into a byte array.

Methods inherited from class java.lang.Object

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

Constructor Detail

CipherFrameHeaders

public CipherFrameHeaders()

Default constructor.

CipherFrameHeaders

public CipherFrameHeaders(int sequenceNumber,
                          byte[] nonce,
                          int frameContentLen,
                          boolean isFinal)

Construct the frame headers using the provided sequence number, nonce, length of content, and boolean value indicating if it is the final frame.

Parameters:

sequenceNumber - the sequence number of the frame

nonce - the bytes containing the nonce.

frameContentLen - the length of the content in the frame.

isFinal - boolean value indicating if it is the final frame.

Method Detail

toByteArray

public byte[] toByteArray()

Serialize the header into a byte array.

Returns:

the serialized bytes of the header.

deserialize

public int deserialize(byte[] b,
                       int off)

Deserialize the provided bytes starting at the specified offset to construct an instance of this class.

This method parses the provided bytes for the individual fields in this class. This methods also supports partial parsing where not all the bytes required for parsing the fields successfully are available.

Parameters:

b - the byte array to deserialize.

off - the offset in the byte array to use for deserialization.

Returns:

the number of bytes consumed in deserialization.

isFinalFrame

public boolean isFinalFrame()

Return if the frame is a final frame. The final frame is identified as the frame containing the final sequence number marker.

Returns:

true if final frame; false otherwise.

isComplete

public boolean isComplete()

Check if this object has all the header fields populated and available for reading.

Returns:

true if this object containing the single block header fields is complete; false otherwise.

getNonce

public byte[] getNonce()

Return the nonce set in the frame header.

Returns:

the bytes containing the nonce set in the frame header.

getFrameContentLength

public int getFrameContentLength()

Return the frame content length set in the frame header.

Returns:

the frame content length set in the frame header.

getSequenceNumber

public int getSequenceNumber()

Return the frame sequence number set in the frame header.

Returns:

the frame sequence number set in the frame header.

setNonceLength

public void setNonceLength(short nonceLength)

Set the length of the nonce used in the encryption of the content in the frame.

Parameters:

nonceLength - the length of the nonce used in the encryption of the content in the frame.

includeFrameSize

public void includeFrameSize(boolean value)

Set the flag to specify whether the frame length needs to be included or parsed in the header.

Parameters:

value - true if the frame length needs to be included or parsed in the header; false otherwise