net.i2p.crypto
Class AESEngine

java.lang.Object
  net.i2p.crypto.AESEngine

Direct Known Subclasses:

CryptixAESEngine

public class AESEngine
extends Object

Dummy wrapper for AES cipher operation. Warning - most methods UNUSED unless i2p.encryption = off See CryptixAESEngine overrides for the real thing.

Field Summary

protected I2PAppContext	_context
protected Log	_log

Constructor Summary

AESEngine(I2PAppContext ctx)

Method Summary

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) This just copies payload to rv, see extension for the real thing.
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) This just copies payload to out, see extension for the real thing.
byte[]	safeDecrypt(byte[] payload, SessionKey sessionKey, byte[] iv) Deprecated. unused
byte[]	safeEncrypt(byte[] payload, SessionKey sessionKey, byte[] iv, int paddedSize) Deprecated. unused

Methods inherited from class java.lang.Object

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

Field Detail

_log

protected final Log _log

_context

protected final I2PAppContext _context

Constructor Detail

AESEngine

public AESEngine(I2PAppContext ctx)

Method Detail

encrypt

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

Encrypt the payload with the session key

Parameters:

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

iv - IV for CBC, must be 16 bytes

length - how much data to encrypt

encrypt

public 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. This just copies payload to out, see extension for the real thing.

Parameters:

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

iv - IV for CBC

length - how much data to encrypt

safeEncrypt

public byte[] safeEncrypt(byte[] payload,
                          SessionKey sessionKey,
                          byte[] iv,
                          int paddedSize)

Deprecated. unused

Encrypt the SHA-256 Hash of the IV, the 4 byte length, and the payload, with random padding up to the paddedSize, rounded up to the next multiple of 16.

Parameters:

paddedSize - minimum size of the output

iv - IV for CBC, must be 16 bytes

Returns:

null on error

safeDecrypt

public byte[] safeDecrypt(byte[] payload,
                          SessionKey sessionKey,
                          byte[] iv)

Deprecated. unused

See safeEncrypt() for description. WARNING - no check for maximum length here, OOM DOS possible, fix it if you're going to use this.

Parameters:

iv - IV for CBC, must be 16 bytes

Returns:

null on error

decrypt

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

Decrypt the data with the session key

Parameters:

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

iv - IV for CBC

length - how much data to decrypt

decrypt

public 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. This just copies payload to out, see extension for the real thing.

Parameters:

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

iv - IV for CBC

length - how much data to decrypt

encryptBlock

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

This just copies payload to out, see extension for the real thing.

Parameters:

sessionKey - unused

decryptBlock

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

This just copies payload to rv, see extension for the real thing.

Parameters:

payload - encrypted data

sessionKey - private session key