Package net.i2p.crypto

Class CryptixAESEngine

java.lang.Object

net.i2p.crypto.AESEngine

net.i2p.crypto.CryptixAESEngine

public final class CryptixAESEngine
extends AESEngine

Wrapper for AES cypher operation using Cryptix's Rijndael implementation. Implements CBC with a 16 byte IV. Problems: Only supports data of size mod 16 bytes - no inherent padding.

Author:

jrandom, thecrypto

Field Summary

Fields inherited from class net.i2p.crypto.AESEngine

_context, _log

Constructor Summary

Constructors

Constructor	Description
CryptixAESEngine(I2PAppContext context)

Method Summary

Modifier and Type	Method	Description
void	decrypt(byte[] payload, int payloadIndex, byte[] out, int outIndex, SessionKey sessionKey, byte[] iv, int length)	Decrypt the data with the session key
void	decrypt(byte[] payload, int payloadIndex, byte[] out, int outIndex, SessionKey sessionKey, byte[] iv, int ivOffset, int length)	Decrypt the data with the session key.
void	decryptBlock(byte[] payload, int inIndex, SessionKey sessionKey, byte[] rv, int outIndex)	decrypt exactly 16 bytes of data with the session key provided
void	encrypt(byte[] payload, int payloadIndex, byte[] out, int outIndex, SessionKey sessionKey, byte[] iv, int length)	Encrypt the payload with the session key
void	encrypt(byte[] payload, int payloadIndex, byte[] out, int outIndex, SessionKey sessionKey, byte[] iv, int ivOffset, int length)	Encrypt the payload with the session key.
void	encryptBlock(byte[] payload, int inIndex, SessionKey sessionKey, byte[] out, int outIndex)	encrypt exactly 16 bytes using the session key

Methods inherited from class net.i2p.crypto.AESEngine

getPadding, getPaddingSize, safeDecrypt, safeEncrypt

Methods inherited from class java.lang.Object

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

Constructor Detail

CryptixAESEngine

public CryptixAESEngine(I2PAppContext context)

Method Detail

encrypt

public void encrypt(byte[] payload,
                    int payloadIndex,
                    byte[] out,
                    int outIndex,
                    SessionKey sessionKey,
                    byte[] iv,
                    int length)

Description copied from class: AESEngine

Encrypt the payload with the session key

Overrides:

encrypt in class AESEngine

Parameters:

iv - must be 16 bytes

length - must be a multiple of 16

payload - data to be encrypted

payloadIndex - index into the payload to start encrypting

out - where to store the result

outIndex - where in out to start writing

sessionKey - private esession key to encrypt to

encrypt

public void encrypt(byte[] payload,
                    int payloadIndex,
                    byte[] out,
                    int outIndex,
                    SessionKey sessionKey,
                    byte[] iv,
                    int ivOffset,
                    int length)

Description copied from class: AESEngine

Encrypt the payload with the session key. This just copies payload to out, see extension for the real thing.

Overrides:

encrypt in class AESEngine

Parameters:

iv - must be 16 bytes

length - must be a multiple of 16

payload - data to be encrypted

payloadIndex - index into the payload to start encrypting

out - where to store the result

outIndex - where in out to start writing

sessionKey - private esession key to encrypt to

decrypt

public void decrypt(byte[] payload,
                    int payloadIndex,
                    byte[] out,
                    int outIndex,
                    SessionKey sessionKey,
                    byte[] iv,
                    int length)

Description copied from class: AESEngine

Decrypt the data with the session key

Overrides:

decrypt in class AESEngine

Parameters:

iv - 16 bytes

length - must be a multiple of 16 (will overrun to next mod 16 if not)

payload - data to be decrypted

payloadIndex - index into the payload to start decrypting

out - where to store the cleartext

outIndex - where in out to start writing

sessionKey - private session key to decrypt to

decrypt

public void decrypt(byte[] payload,
                    int payloadIndex,
                    byte[] out,
                    int outIndex,
                    SessionKey sessionKey,
                    byte[] iv,
                    int ivOffset,
                    int length)

Description copied from class: AESEngine

Decrypt the data with the session key. This just copies payload to out, see extension for the real thing.

Overrides:

decrypt in class AESEngine

Parameters:

iv - 16 bytes starting at ivOffset

length - must be a multiple of 16 (will overrun to next mod 16 if not)

payload - data to be decrypted

payloadIndex - index into the payload to start decrypting

out - where to store the cleartext

outIndex - where in out to start writing

sessionKey - private session key to decrypt to

encryptBlock

public final void encryptBlock(byte[] payload,
                               int inIndex,
                               SessionKey sessionKey,
                               byte[] out,
                               int outIndex)

encrypt exactly 16 bytes using the session key

Overrides:

encryptBlock in class AESEngine

Parameters:

payload - plaintext data, 16 bytes starting at inIndex

sessionKey - private session key

out - out parameter, 16 bytes starting at outIndex

decryptBlock

public final void decryptBlock(byte[] payload,
                               int inIndex,
                               SessionKey sessionKey,
                               byte[] rv,
                               int outIndex)

decrypt exactly 16 bytes of data with the session key provided

Overrides:

decryptBlock in class AESEngine

Parameters:

payload - encrypted data, 16 bytes starting at inIndex

sessionKey - private session key

rv - out parameter, 16 bytes starting at outIndex