org.openeuler.sm4.mode

类 CCM

java.lang.Object

javax.crypto.CipherSpi

org.openeuler.sm4.SM4BaseCipher

org.openeuler.sm4.StreamModeBaseCipher

org.openeuler.sm4.mode.CCM

public class CCM
extends StreamModeBaseCipher

SM4 CCM mode refer to RFC3610

字段概要

字段

限定符和类型	字段和说明
private byte[]	aad
private byte[]	B
private byte[]	counter0
private int	defaultIvLen
private int	L
private byte[]	lenA
private int	M

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
CCM()

方法概要

限定符和类型	方法和说明
private void	checkMac(byte[] T, byte[] _T) determine whether the authentication tag is consistent
private byte[]	decrypt(byte[] input, int inputOffset, int inputLen) CCM decrypt
private void	encrypt(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) CCM encrypt
byte[]	engineDoFinal(byte[] input, int inputOffset, int inputLen)
int	engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
int	engineGetOutputSize(int inputLen)
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	getCountero() get the CTR0 according to iv
private byte[]	getTag(byte[] plainText) generate authentication tag
private void	incr() CCM counter increment
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	readInt(byte[] arr, int x, int start) convert x into byte array
void	reset() reset some parameters after encryption

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

engineGetIV, engineGetParameters

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

M

private final int M

另请参阅:

常量字段值

L

private int L

defaultIvLen

private final int defaultIvLen

另请参阅:

常量字段值

B

private byte[] B

counter0

private byte[] counter0

aad

private byte[] aad

lenA

private byte[] lenA

构造器详细资料

CCM

public CCM()

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

engineUpdateAAD

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

覆盖:

engineUpdateAAD 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

engineUpdate

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

覆盖:

engineUpdate 在类中 SM4BaseCipher

engineSetPadding

public void engineSetPadding(String padding)
                      throws NoSuchPaddingException

覆盖:

engineSetPadding 在类中 SM4BaseCipher

抛出:

NoSuchPaddingException

engineDoFinal

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

覆盖:

engineDoFinal 在类中 StreamModeBaseCipher

抛出:

IllegalBlockSizeException

BadPaddingException

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

getCountero

private void getCountero()

get the CTR0 according to iv

incr

private void incr()

CCM counter increment

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:

抛出:

Exception

encrypt

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

CCM encrypt

参数:

input -

inputOffset -

inputLen -

output -

outputOffset -

decrypt

private byte[] decrypt(byte[] input,
                       int inputOffset,
                       int inputLen)

CCM decrypt

参数:

input -

inputOffset -

inputLen -

返回:

reset

public void reset()

从类复制的说明: SM4BaseCipher

reset some parameters after encryption

覆盖:

reset 在类中 StreamModeBaseCipher

getTag

private byte[] getTag(byte[] plainText)

generate authentication tag

参数:

plainText -

返回:

readInt

private void readInt(byte[] arr,
                     int x,
                     int start)

convert x into byte array

参数:

arr - store the convert result

x - to be converted data

start - offset of arr

checkMac

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

determine whether the authentication tag is consistent

参数:

T - the calculated tag

_T - tag in cipherText