org.openeuler.sm4.mode

类 GCM

java.lang.Object

javax.crypto.CipherSpi

org.openeuler.sm4.SM4BaseCipher

org.openeuler.sm4.StreamModeBaseCipher

org.openeuler.sm4.mode.GCM

public class GCM
extends StreamModeBaseCipher

SM4 GCM mode refer to: https://zh.wikipedia.org/wiki/%E4%BC%BD%E7%BD%97%E7%93%A6/%E8%AE%A1%E6%95%B0%E5%99%A8%E6%A8%A1%E5%BC%8F refer to: nistspecialpublication800-38d

字段概要

字段

限定符和类型	字段和说明
private byte[]	aad
private int	aLen
private int	cLen
private byte[]	counter0
private int	defaultIvLen
private byte[]	g
private byte[]	H
private byte[]	lastEncIv
private byte[]	lastEncKey
private boolean	requireReinit
private byte[]	T
private int	tLen
private byte[]	updateData

从类继承的字段 org.openeuler.sm4.StreamModeBaseCipher

counter, iv

从类继承的字段 org.openeuler.sm4.SM4BaseCipher

BLOCKSIZE, inputLenUpdate, inputOffsetUpdate, inputUpdate, isInitialized, len, opmode, padding, rk, sm4

构造器概要

构造器

构造器和说明
GCM()

方法概要

限定符和类型	方法和说明
private boolean	checkMac(byte[] T, byte[] _T) determine whether the authentication tag is consistent
private void	checkReinit()
private boolean	checkTagLen(GCMParameterSpec spec) check if the mac size is valid
private void	decrypt(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset, boolean first) decrypt and check the authentication tag
private void	encrypt(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset, boolean first) encrypt and generate authentication tag
byte[]	engineDoFinal(byte[] input, int inputOffset, int inputLen)
int	engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
int	engineGetOutputSize(int inputLen)
AlgorithmParameters	engineGetParameters()
void	engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random)
void	engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random)
void	engineInit(int opmode, Key key, SecureRandom random)
void	engineSetPadding(String padding)
byte[]	engineUpdate(byte[] input, int inputOffset, int inputLen)
int	engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
protected void	engineUpdateAAD(byte[] src, int offset, int len)
private void	inc32() GCM incrementing function
private byte	increment(int index) determines whether the binary bit of counter[index] contains zeros if it contains zero, it changes the rightmost zero to 1 and all binary positions to its right to 0 if it does not contain 0, it throws an exception
private void	processG(byte[] cipherText, boolean first) process intermediate authentication parameters
private void	processGCM(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) encrypt(decrypt) entire blocks of data
void	reset() reset some parameters after encryption

从类继承的方法 org.openeuler.sm4.StreamModeBaseCipher

engineGetIV

从类继承的方法 org.openeuler.sm4.SM4BaseCipher

engineGetBlockSize, engineSetMode, init

从类继承的方法 javax.crypto.CipherSpi

engineDoFinal, engineGetKeySize, engineUnwrap, engineUpdate, engineUpdateAAD, engineWrap

从类继承的方法 java.lang.Object

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

字段详细资料

T

private byte[] T

aad

private byte[] aad

H

private byte[] H

g

private byte[] g

defaultIvLen

private final int defaultIvLen

另请参阅:

常量字段值

tLen

private int tLen

counter0

private byte[] counter0

aLen

private int aLen

cLen

private int cLen

updateData

private byte[] updateData

requireReinit

private boolean requireReinit

lastEncIv

private byte[] lastEncIv

lastEncKey

private byte[] lastEncKey

构造器详细资料

GCM

public GCM()

方法详细资料

engineInit

public void engineInit(int opmode,
                       Key key,
                       SecureRandom random)
                throws InvalidKeyException

覆盖:

engineInit 在类中 StreamModeBaseCipher

抛出:

InvalidKeyException

engineInit

public void engineInit(int opmode,
                       Key key,
                       AlgorithmParameterSpec params,
                       SecureRandom random)
                throws InvalidKeyException,
                       InvalidAlgorithmParameterException

覆盖:

engineInit 在类中 StreamModeBaseCipher

抛出:

InvalidKeyException

InvalidAlgorithmParameterException

engineInit

public void engineInit(int opmode,
                       Key key,
                       AlgorithmParameters params,
                       SecureRandom random)
                throws InvalidKeyException,
                       InvalidAlgorithmParameterException

覆盖:

engineInit 在类中 StreamModeBaseCipher

抛出:

InvalidKeyException

InvalidAlgorithmParameterException

engineGetOutputSize

public int engineGetOutputSize(int inputLen)

覆盖:

engineGetOutputSize 在类中 SM4BaseCipher

engineGetParameters

public AlgorithmParameters engineGetParameters()

覆盖:

engineGetParameters 在类中 StreamModeBaseCipher

engineSetPadding

public void engineSetPadding(String padding)
                      throws NoSuchPaddingException

覆盖:

engineSetPadding 在类中 SM4BaseCipher

抛出:

NoSuchPaddingException

engineUpdate

public byte[] engineUpdate(byte[] input,
                           int inputOffset,
                           int inputLen)

覆盖:

engineUpdate 在类中 SM4BaseCipher

engineUpdate

public int engineUpdate(byte[] input,
                        int inputOffset,
                        int inputLen,
                        byte[] output,
                        int outputOffset)
                 throws ShortBufferException

覆盖:

engineUpdate 在类中 SM4BaseCipher

抛出:

ShortBufferException

engineDoFinal

public int engineDoFinal(byte[] input,
                         int inputOffset,
                         int inputLen,
                         byte[] output,
                         int outputOffset)
                  throws ShortBufferException,
                         IllegalBlockSizeException,
                         BadPaddingException

覆盖:

engineDoFinal 在类中 StreamModeBaseCipher

抛出:

ShortBufferException

IllegalBlockSizeException

BadPaddingException

engineDoFinal

public byte[] engineDoFinal(byte[] input,
                            int inputOffset,
                            int inputLen)
                     throws IllegalBlockSizeException,
                            BadPaddingException

覆盖:

engineDoFinal 在类中 StreamModeBaseCipher

抛出:

IllegalBlockSizeException

BadPaddingException

engineUpdateAAD

protected void engineUpdateAAD(byte[] src,
                               int offset,
                               int len)

覆盖:

engineUpdateAAD 在类中 SM4BaseCipher

checkTagLen

private boolean checkTagLen(GCMParameterSpec spec)
                     throws InvalidAlgorithmParameterException

check if the mac size is valid

参数:

spec -

返回:

抛出:

InvalidAlgorithmParameterException

checkMac

private boolean checkMac(byte[] T,
                         byte[] _T)

determine whether the authentication tag is consistent

参数:

T - the calculated tag

_T - tag in cipherText

返回:

processGCM

private void processGCM(byte[] input,
                        int inputOffset,
                        int inputLen,
                        byte[] output,
                        int outputOffset)

encrypt(decrypt) entire blocks of data

参数:

input -

inputOffset -

inputLen -

output -

outputOffset -

encrypt

private void encrypt(byte[] input,
                     int inputOffset,
                     int inputLen,
                     byte[] output,
                     int outputOffset,
                     boolean first)

encrypt and generate authentication tag

参数:

input -

inputOffset -

inputLen -

output -

outputOffset -

first -

decrypt

private void decrypt(byte[] input,
                     int inputOffset,
                     int inputLen,
                     byte[] output,
                     int outputOffset,
                     boolean first)

decrypt and check the authentication tag

参数:

input -

inputOffset -

inputLen -

output -

outputOffset -

first -

inc32

private void inc32()

GCM incrementing function

increment

private byte increment(int index)
                throws Exception

determines whether the binary bit of counter[index] contains zeros if it contains zero, it changes the rightmost zero to 1 and all binary positions to its right to 0 if it does not contain 0, it throws an exception

参数:

index -

返回:

value of counter[index] after the change

抛出:

Exception

processG

private void processG(byte[] cipherText,
                      boolean first)

process intermediate authentication parameters

参数:

cipherText - aad or cipherText

first - indicates if this is the first time the function has been called

reset

public void reset()

从类复制的说明: SM4BaseCipher

reset some parameters after encryption

覆盖:

reset 在类中 StreamModeBaseCipher

checkReinit

private void checkReinit()