org.openeuler.sm4

类 SM4Util

java.lang.Object

org.openeuler.sm4.SM4Util

public class SM4Util
extends Object

implement SM4 encryption and decryption

字段概要

字段

限定符和类型	字段和说明
private int	BLOCK_SIZE
private static int[]	CK
private static int[]	FK
private static byte[]	S_BOX

构造器概要

构造器

构造器和说明
SM4Util()

方法概要

限定符和类型	方法和说明
private int	_l(int input) L' change
private int	_t(int input) T' change
int	bigEndianToInt(byte[] bytes, int start) convert 4 bytes to int
static void	copyArray(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) copy the input from inputOffset into the output
byte[]	decrypt(int[] rk, byte[] cipherText) SM4 decrypt
byte[]	decrypt(int[] rk, byte[] input, int inputOffset) SM4 decrypt
void	decrypt(int[] rk, byte[] input, int inputOffset, byte[] output, int outputOffset) SM4 decrypt
byte[]	encrypt(int[] rk, byte[] input) SM4 encrypt
byte[]	encrypt(int[] rk, byte[] input, int inputOffset) SM4 encrypt
void	encrypt(int[] rk, byte[] input, int inputOffset, byte[] output, int outputOffset) SM4 encrypt
int[]	expandKey(byte[] key) calculate rk
private int	f(int x0, int x1, int x2, int x3, int rk0) F function
void	intToBigEndian(byte[] output, int x, int start) convert int to 4 bytes
private int	l(int input) L change
private byte[]	reverse(int x32, int x33, int x34, int x35) reverse
private void	reverse(int x32, int x33, int x34, int x35, byte[] output, int outputOffset) reverse
private int	t(int input) T change
private int	tau(int input) τtrsform
byte[]	xor(byte[] b1, byte[] b2) xor operation
byte[]	xor(byte[] b1, int from1, int len1, byte[] b2, int from2, int len2) xor operation
byte[]	xor16Byte(byte[] b1, byte[] b2) xor operation

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

S_BOX

private static final byte[] S_BOX

CK

private static final int[] CK

FK

private static final int[] FK

BLOCK_SIZE

private final int BLOCK_SIZE

另请参阅:

常量字段值

构造器详细资料

SM4Util

public SM4Util()

方法详细资料

tau

private int tau(int input)

τtrsform

参数:

input - input(a0,a1,a2,a3)

返回:

τ(input)=(sbox(a0),sbox(a1),sbox(a2),sbox(a3))

l

private int l(int input)

L change

参数:

input -

返回:

_l

private int _l(int input)

L' change

参数:

input -

返回:

t

private int t(int input)

T change

参数:

input -

返回:

_t

private int _t(int input)

T' change

参数:

input -

返回:

f

private int f(int x0,
              int x1,
              int x2,
              int x3,
              int rk0)

F function

参数:

x0 -

x1 -

x2 -

x3 -

rk0 -

返回:

reverse

private byte[] reverse(int x32,
                       int x33,
                       int x34,
                       int x35)

reverse

参数:

x32 -

x33 -

x34 -

x35 -

返回:

reverse

private void reverse(int x32,
                     int x33,
                     int x34,
                     int x35,
                     byte[] output,
                     int outputOffset)

reverse

参数:

x32 -

x33 -

x34 -

x35 -

output -

outputOffset -

intToBigEndian

public void intToBigEndian(byte[] output,
                           int x,
                           int start)

convert int to 4 bytes

参数:

output -

x -

start -

bigEndianToInt

public int bigEndianToInt(byte[] bytes,
                          int start)

convert 4 bytes to int

参数:

bytes -

start -

返回:

expandKey

public int[] expandKey(byte[] key)

calculate rk

参数:

key -

返回:

encrypt

public byte[] encrypt(int[] rk,
                      byte[] input)

SM4 encrypt

参数:

rk -

input -

返回:

encrypt

public byte[] encrypt(int[] rk,
                      byte[] input,
                      int inputOffset)

SM4 encrypt

参数:

rk -

input -

inputOffset -

返回:

encrypt

public void encrypt(int[] rk,
                    byte[] input,
                    int inputOffset,
                    byte[] output,
                    int outputOffset)

SM4 encrypt

参数:

rk -

input -

inputOffset -

output -

outputOffset -

decrypt

public byte[] decrypt(int[] rk,
                      byte[] cipherText)

SM4 decrypt

参数:

rk -

cipherText -

返回:

decrypt

public byte[] decrypt(int[] rk,
                      byte[] input,
                      int inputOffset)

SM4 decrypt

参数:

rk -

input -

inputOffset -

返回:

decrypt

public void decrypt(int[] rk,
                    byte[] input,
                    int inputOffset,
                    byte[] output,
                    int outputOffset)

SM4 decrypt

参数:

rk -

input -

inputOffset -

output -

outputOffset -

xor

public byte[] xor(byte[] b1,
                  byte[] b2)

xor operation

参数:

b1 -

b2 -

返回:

the result of XOR of the shorter array and the corresponding part of the longer array

xor

public byte[] xor(byte[] b1,
                  int from1,
                  int len1,
                  byte[] b2,
                  int from2,
                  int len2)

xor operation

参数:

b1 -

from1 - b1's start index

len1 -

b2 -

from2 - b2's start index

len2 -

返回:

the result of XOR of the shorter array and the corresponding part of the longer array

xor16Byte

public byte[] xor16Byte(byte[] b1,
                        byte[] b2)

xor operation

参数:

b1 -

b2 -

返回:

16 bytes result of b1 xor b2 if b1.length<16 when i>b1.length res[i]= b2[i]^0 = b2[i];

copyArray

public static void copyArray(byte[] input,
                             int inputOffset,
                             int inputLen,
                             byte[] output,
                             int outputOffset)

copy the input from inputOffset into the output

参数:

input -

inputOffset -

inputLen -

output -

outputOffset -