c語(yǔ)言des函數(shù) c語(yǔ)言里面的函數(shù)

用C語(yǔ)言來實(shí)現(xiàn)DES加密算法（很急）兩天內(nèi)

DES雖然不難但是挺繁復(fù)的，代碼如下，關(guān)鍵點(diǎn)都有英文解釋，仔細(xì)看。各個(gè)函數(shù)的功能都可以從函數(shù)名看出來。

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#include "pch.h"

#include "misc.h"

#include "des.h"

NAMESPACE_BEGIN(CryptoPP)

/* Tables defined in the Data Encryption Standard documents

* Three of these tables, the initial permutation, the final

* permutation and the expansion operator, are regular enough that

* for speed, we hard-code them. They're here for reference only.

* Also, the S and P boxes are used by a separate program, gensp.c,

* to build the combined SP box, Spbox[]. They're also here just

* for reference.

#ifdef notdef

/* initial permutation IP */

static byte ip[] = {

58, 50, 42, 34, 26, 18, 10, 2,

60, 52, 44, 36, 28, 20, 12, 4,

62, 54, 46, 38, 30, 22, 14, 6,

64, 56, 48, 40, 32, 24, 16, 8,

57, 49, 41, 33, 25, 17, 9, 1,

59, 51, 43, 35, 27, 19, 11, 3,

61, 53, 45, 37, 29, 21, 13, 5,

63, 55, 47, 39, 31, 23, 15, 7

};

/* final permutation IP^-1 */

static byte fp[] = {

40, 8, 48, 16, 56, 24, 64, 32,

39, 7, 47, 15, 55, 23, 63, 31,

38, 6, 46, 14, 54, 22, 62, 30,

37, 5, 45, 13, 53, 21, 61, 29,

36, 4, 44, 12, 52, 20, 60, 28,

35, 3, 43, 11, 51, 19, 59, 27,

34, 2, 42, 10, 50, 18, 58, 26,

33, 1, 41, 9, 49, 17, 57, 25

};

/* expansion operation matrix */

static byte ei[] = {

32, 1, 2, 3, 4, 5,

4, 5, 6, 7, 8, 9,

8, 9, 10, 11, 12, 13,

12, 13, 14, 15, 16, 17,

16, 17, 18, 19, 20, 21,

20, 21, 22, 23, 24, 25,

24, 25, 26, 27, 28, 29,

28, 29, 30, 31, 32, 1

};

/* The (in)famous S-boxes */

static byte sbox[8][64] = {

/* S1 */

14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,

0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,

4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,

15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,

/* S2 */

15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,

3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,

0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,

13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,

/* S3 */

10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,

13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,

13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,

1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,

/* S4 */

7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,

13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,

10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,

3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,

/* S5 */

2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,

14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,

4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,

11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,

/* S6 */

12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,

10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,

9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,

4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,

/* S7 */

4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,

13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,

1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,

6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,

/* S8 */

13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,

1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,

7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,

2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11

};

/* 32-bit permutation function P used on the output of the S-boxes */

static byte p32i[] = {

16, 7, 20, 21,

29, 12, 28, 17,

1, 15, 23, 26,

5, 18, 31, 10,

2, 8, 24, 14,

32, 27, 3, 9,

19, 13, 30, 6,

22, 11, 4, 25

};

#endif

/* permuted choice table (key) */

static const byte pc1[] = {

57, 49, 41, 33, 25, 17, 9,

1, 58, 50, 42, 34, 26, 18,

10, 2, 59, 51, 43, 35, 27,

19, 11, 3, 60, 52, 44, 36,

63, 55, 47, 39, 31, 23, 15,

7, 62, 54, 46, 38, 30, 22,

14, 6, 61, 53, 45, 37, 29,

21, 13, 5, 28, 20, 12, 4

};

/* number left rotations of pc1 */

static const byte totrot[] = {

1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28

};

/* permuted choice key (table) */

static const byte pc2[] = {

14, 17, 11, 24, 1, 5,

3, 28, 15, 6, 21, 10,

23, 19, 12, 4, 26, 8,

16, 7, 27, 20, 13, 2,

41, 52, 31, 37, 47, 55,

30, 40, 51, 45, 33, 48,

44, 49, 39, 56, 34, 53,

46, 42, 50, 36, 29, 32

};

/* End of DES-defined tables */

/* bit 0 is left-most in byte */

static const int bytebit[] = {

0200,0100,040,020,010,04,02,01

};

/* Set key (initialize key schedule array) */

DES::DES(const byte *key, CipherDir dir)

: k(32)

{

SecByteBlock buffer(56+56+8);

byte *const pc1m=buffer; /* place to modify pc1 into */

byte *const pcr=pc1m+56; /* place to rotate pc1 into */

byte *const ks=pcr+56;

int m;

for (j=0; j56; j++) { /* convert pc1 to bits of key */

l=pc1[j]-1; /* integer bit location */

m = l 07; /* find bit */

pc1m[j]=(key[l3] /* find which key byte l is in */

bytebit[m]) /* and which bit of that byte */

? 1 : 0; /* and store 1-bit result */

}

for (i=0; i16; i++) { /* key chunk for each iteration */

memset(ks,0,8); /* Clear key schedule */

for (j=0; j56; j++) /* rotate pc1 the right amount */

pcr[j] = pc1m[(l=j+totrot[i])(j28? 28 : 56) ? l: l-28];

/* rotate left and right halves independently */

for (j=0; j48; j++){ /* select bits individually */

/* check bit that goes to ks[j] */

if (pcr[pc2[j]-1]){

/* mask it in if it's there */

l= j % 6;

ks[j/6] |= bytebit[l] 2;

}

/* Now convert to odd/even interleaved form for use in F */

k[2*i] = ((word32)ks[0] 24)

| ((word32)ks[2] 16)

| ((word32)ks[4] 8)

| ((word32)ks[6]);

k[2*i+1] = ((word32)ks[1] 24)

| ((word32)ks[3] 16)

| ((word32)ks[5] 8)

| ((word32)ks[7]);

}

if (dir==DECRYPTION) // reverse key schedule order

for (i=0; i16; i+=2)

{

std::swap(k[i], k[32-2-i]);

std::swap(k[i+1], k[32-1-i]);

}

/* End of C code common to both versions */

/* C code only in portable version */

// Richard Outerbridge's initial permutation algorithm

inline void IPERM(word32 left, word32 right)

{

word32 work;

work = ((left 4) ^ right) 0x0f0f0f0f;

right ^= work;

left ^= work 4;

work = ((left 16) ^ right) 0xffff;

right ^= work;

left ^= work 16;

work = ((right 2) ^ left) 0x33333333;

left ^= work;

right ^= (work 2);

work = ((right 8) ^ left) 0xff00ff;

left ^= work;

right ^= (work 8);

right = rotl(right, 1);

work = (left ^ right) 0xaaaaaaaa;

left ^= work;

right ^= work;

left = rotl(left, 1);

}

inline void FPERM(word32 left, word32 right)

{

word32 work;

right = rotr(right, 1);

work = (left ^ right) 0xaaaaaaaa;

left ^= work;

right ^= work;

left = rotr(left, 1);

work = ((left 8) ^ right) 0xff00ff;

right ^= work;

left ^= work 8;

work = ((left 2) ^ right) 0x33333333;

right ^= work;

left ^= work 2;

work = ((right 16) ^ left) 0xffff;

left ^= work;

right ^= work 16;

work = ((right 4) ^ left) 0x0f0f0f0f;

left ^= work;

right ^= work 4;

}

// Wei Dai's modification to Richard Outerbridge's initial permutation

// algorithm, this one is faster if you have access to rotate instructions

// (like in MSVC)

inline void IPERM(word32 left, word32 right)

{

word32 work;

right = rotl(right, 4U);

work = (left ^ right) 0xf0f0f0f0;

left ^= work;

right = rotr(right^work, 20U);

work = (left ^ right) 0xffff0000;

left ^= work;

right = rotr(right^work, 18U);

work = (left ^ right) 0x33333333;

left ^= work;

right = rotr(right^work, 6U);

work = (left ^ right) 0x00ff00ff;

left ^= work;

right = rotl(right^work, 9U);

work = (left ^ right) 0xaaaaaaaa;

left = rotl(left^work, 1U);

right ^= work;

}

inline void FPERM(word32 left, word32 right)

{

word32 work;

right = rotr(right, 1U);

work = (left ^ right) 0xaaaaaaaa;

right ^= work;

left = rotr(left^work, 9U);

work = (left ^ right) 0x00ff00ff;

right ^= work;

left = rotl(left^work, 6U);

work = (left ^ right) 0x33333333;

right ^= work;

left = rotl(left^work, 18U);

work = (left ^ right) 0xffff0000;

right ^= work;

left = rotl(left^work, 20U);

work = (left ^ right) 0xf0f0f0f0;

right ^= work;

left = rotr(left^work, 4U);

}

// Encrypt or decrypt a block of data in ECB mode

void DES::ProcessBlock(const byte *inBlock, byte * outBlock) const

{

word32 l,r,work;

#ifdef IS_LITTLE_ENDIAN

l = byteReverse(*(word32 *)inBlock);

r = byteReverse(*(word32 *)(inBlock+4));

#else

l = *(word32 *)inBlock;

r = *(word32 *)(inBlock+4);

#endif

IPERM(l,r);

const word32 *kptr=k;

for (unsigned i=0; i8; i++)

{

work = rotr(r, 4U) ^ kptr[4*i+0];

l ^= Spbox[6][(work) 0x3f]

^ Spbox[4][(work 8) 0x3f]

^ Spbox[2][(work 16) 0x3f]

^ Spbox[0][(work 24) 0x3f];

work = r ^ kptr[4*i+1];

l ^= Spbox[7][(work) 0x3f]

^ Spbox[5][(work 8) 0x3f]

^ Spbox[3][(work 16) 0x3f]

^ Spbox[1][(work 24) 0x3f];

work = rotr(l, 4U) ^ kptr[4*i+2];

r ^= Spbox[6][(work) 0x3f]

^ Spbox[4][(work 8) 0x3f]

^ Spbox[2][(work 16) 0x3f]

^ Spbox[0][(work 24) 0x3f];

work = l ^ kptr[4*i+3];

r ^= Spbox[7][(work) 0x3f]

^ Spbox[5][(work 8) 0x3f]

^ Spbox[3][(work 16) 0x3f]

^ Spbox[1][(work 24) 0x3f];

}

FPERM(l,r);

#ifdef IS_LITTLE_ENDIAN

*(word32 *)outBlock = byteReverse(r);

*(word32 *)(outBlock+4) = byteReverse(l);

#else

*(word32 *)outBlock = r;

*(word32 *)(outBlock+4) = l;

#endif

}

void DES_EDE_Encryption::ProcessBlock(byte *inoutBlock) const

{

e.ProcessBlock(inoutBlock);

d.ProcessBlock(inoutBlock);

e.ProcessBlock(inoutBlock);

}

void DES_EDE_Encryption::ProcessBlock(const byte *inBlock, byte *outBlock) const

{

e.ProcessBlock(inBlock, outBlock);

d.ProcessBlock(outBlock);

e.ProcessBlock(outBlock);

}

void DES_EDE_Decryption::ProcessBlock(byte *inoutBlock) const

{

d.ProcessBlock(inoutBlock);

e.ProcessBlock(inoutBlock);

d.ProcessBlock(inoutBlock);

}

void DES_EDE_Decryption::ProcessBlock(const byte *inBlock, byte *outBlock) const

{

d.ProcessBlock(inBlock, outBlock);

e.ProcessBlock(outBlock);

d.ProcessBlock(outBlock);

}

void TripleDES_Encryption::ProcessBlock(byte *inoutBlock) const

{

e1.ProcessBlock(inoutBlock);

d.ProcessBlock(inoutBlock);

e2.ProcessBlock(inoutBlock);

}

void TripleDES_Encryption::ProcessBlock(const byte *inBlock, byte *outBlock) const

{

e1.ProcessBlock(inBlock, outBlock);

d.ProcessBlock(outBlock);

e2.ProcessBlock(outBlock);

}

void TripleDES_Decryption::ProcessBlock(byte *inoutBlock) const

{

d1.ProcessBlock(inoutBlock);

e.ProcessBlock(inoutBlock);

d2.ProcessBlock(inoutBlock);

}

void TripleDES_Decryption::ProcessBlock(const byte *inBlock, byte *outBlock) const

{

d1.ProcessBlock(inBlock, outBlock);

e.ProcessBlock(outBlock);

d2.ProcessBlock(outBlock);

}

DES加密算法C語(yǔ)言實(shí)現(xiàn)

#includeiostream.h

class SubKey{ //定義子密鑰為一個(gè)類

public:

int key[8][6];

}subkey[16]; //定義子密鑰對(duì)象數(shù)組

class DES{

int encipher_decipher; //判斷加密還是解密

int key_in[8][8]; //用戶原始輸入的64位二進(jìn)制數(shù)

int key_out[8][7]; //除去每行的最后一位校驗(yàn)位

int c0_d0[8][7]; //存儲(chǔ)經(jīng)PC-1轉(zhuǎn)換后的56位數(shù)據(jù)

int c0[4][7],d0[4][7]; //分別存儲(chǔ)c0,d0

int text[8][8]; //64位明文

int text_ip[8][8]; //經(jīng)IP轉(zhuǎn)換過后的明文

int A[4][8],B[4][8]; //A,B分別存儲(chǔ)經(jīng)IP轉(zhuǎn)換過后明文的兩部分,便于交換

int temp[8][6]; //存儲(chǔ)經(jīng)擴(kuò)展置換后的48位二進(jìn)制值

int temp1[8][6]; //存儲(chǔ)和子密鑰異或后的結(jié)果

int s_result[8][4]; //存儲(chǔ)經(jīng)S變換后的32位值

int text_p[8][4]; //經(jīng)P置換后的32位結(jié)果

int secret_ip[8][8]; //經(jīng)逆IP轉(zhuǎn)換后的密文

public:

void Key_Putting();

void PC_1();

int function(int,int); //異或

void SubKey_Production();

void IP_Convert();

void f();

void _IP_Convert();

void Out_secret();

};

void DES::Key_Putting() //得到密鑰中對(duì)算法有用的56位

{

cout"請(qǐng)輸入64位的密鑰(8行8列且每行都得有奇數(shù)個(gè)1):\n";

for(int i=0;i8;i++)

for(int j=0;j8;j++){

cinkey_in[i][j];

if(j!=7) key_out[i][j]=key_in[i][j];

}

void DES::PC_1() //PC-1置換函數(shù)

{

int pc_1[8][7]={ //PC-1

{57, 49, 41, 33, 25, 17, 9},

{1, 58, 50, 42, 34, 26, 18},

{10, 2, 59, 51, 43, 35, 27},

{19, 11, 3, 60, 52, 44, 36},

{63, 55, 47, 39, 31, 23, 15},

{7, 62, 54, 46, 38, 30, 22},

{14, 6, 61, 53, 45, 37, 29},

{21, 13, 5, 28, 20, 12, 4}

};

int i,j;

for(i=0;i8;i++)

for(j=0;j7;j++)

c0_d0[i][j]=key_out[ (pc_1[i][j]-1)/8 ][ (pc_1[i][j]-1)%8 ];

}

int DES::function(int a,int b) //模擬二進(jìn)制數(shù)的異或運(yùn)算,a和b為整型的0和1,返回值為整型的0或1

{

if(a!=b)return 1;

else return 0;

}

void DES::SubKey_Production() //生成子密鑰

{

int move[16][2]={ //循環(huán)左移的位數(shù)

1 , 1 , 2 , 1 ,

3 , 2 , 4 , 2 ,

5 , 2 , 6 , 2 ,

7 , 2 , 8 , 2 ,

9 , 1, 10 , 2,

11 , 2, 12 , 2,

13 , 2, 14 , 2,

15 , 2, 16 , 1

};

int pc_2[8][6]={ //PC-2

14, 17 ,11 ,24 , 1 , 5,

3 ,28 ,15 , 6 ,21 ,10,

23, 19, 12, 4, 26, 8,

16, 7, 27, 20 ,13 , 2,

41, 52, 31, 37, 47, 55,

30, 40, 51, 45, 33, 48,

44, 49, 39, 56, 34, 53,

46, 42, 50, 36, 29, 32

};

for(int i=0;i16;i++) //生成子密鑰

{

int j,k;

int a[2],b[2];

int bb[28],cc[28];

for(j=0;j4;j++)

for(k=0;k7;k++)

c0[j][k]=c0_d0[j][k];

for(j=4;j8;j++)

for(k=0;k7;k++)

d0[j-4][k]=c0_d0[j][k];

for(j=0;j4;j++)

for(k=0;k7;k++){

bb[7*j+k]=c0[j][k];

cc[7*j+k]=d0[j][k];

}

for(j=0;jmove[i][1];j++){

a[j]=bb[j];

b[j]=cc[j];

}

for(j=0;j28-move[i][1];j++){

bb[j]=bb[j+1];

cc[j]=cc[j+1];

}

for(j=0;jmove[i][1];j++){

bb[27-j]=a[j];

cc[27-j]=b[j];

}

for(j=0;j28;j++){

c0[j/7][j%7]=bb[j];

d0[j/7][j%7]=cc[j];

}

for(j=0;j4;j++) //L123--L128是把c0,d0合并成c0_d0

for(k=0;k7;k++)

c0_d0[j][k]=c0[j][k];

for(j=4;j8;j++)

for(k=0;k7;k++)

c0_d0[j][k]=d0[j-4][k];

for(j=0;j8;j++) //對(duì)Ci,Di進(jìn)行PC-2置換

for(k=0;k6;k++)

subkey[i].key[j][k]=c0_d0[ (pc_2[j][k]-1)/7 ][ (pc_2[j][k]-1)%7 ];

}

void DES::IP_Convert()

{

int IP[8][8]={ //初始置換IP矩陣

58, 50, 42, 34, 26, 18, 10, 2,

60, 52, 44, 36, 28, 20, 12, 4,

62, 54, 46, 38, 30, 22, 14, 6,

64, 56, 48, 40, 32, 24, 16, 8,

57, 49, 41, 33, 25, 17, 9, 1,

59, 51, 43, 35, 27, 19, 11, 3,

61, 53, 45, 37, 29, 21, 13, 5,

63, 55, 47, 39, 31, 23, 15, 7

};

cout"你好,你要加密還是解密?加密請(qǐng)按1號(hào)鍵(輸入1),解密請(qǐng)按2號(hào)鍵,并確定."'\n';

cinencipher_decipher;

char * s;

if(encipher_decipher==1) s="明文";

else s="密文";

cout"請(qǐng)輸入64位"s"(二進(jìn)制):\n";

int i,j;

for(i=0;i8;i++)

for(j=0;j8;j++)

cintext[i][j];

for(i=0;i8;i++) //進(jìn)行IP變換

for(j=0;j8;j++)

text_ip[i][j]=text[ (IP[i][j]-1)/8 ][ (IP[i][j]-1)%8 ];

}

求一個(gè)用c語(yǔ)言寫的DES加密算法~~

using system;

using system.security.cryptography;

using system.io;

using system.text;

public class encryptstringdes {

public static void main(string);

return;

}

// 使用utf8函數(shù)加密輸入?yún)?shù)

utf8encoding utf8encoding = new utf8encoding();

byte.tochararray());

// 方式一：調(diào)用默認(rèn)的des實(shí)現(xiàn)方法des_csp.

des des = des.create();

// 方式二：直接使用des_csp()實(shí)現(xiàn)des的實(shí)體

//des_csp des = new des_csp();

// 初始化des加密的密鑰和一個(gè)隨機(jī)的、8比特的初始化向量(iv)

byte iv = {0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef};

des.key = key;

des.iv = iv;

// 建立加密流

symmetricstreamencryptor sse = des.createencryptor();

// 使用cryptomemorystream方法獲取加密過程的輸出

cryptomemorystream cms = new cryptomemorystream();

// 將symmetricstreamencryptor流中的加密數(shù)據(jù)輸出到cryptomemorystream中

sse.setsink(cms);

// 加密完畢，將結(jié)果輸出到控制臺(tái)

sse.write(inputbytearray);

sse.closestream();

// 獲取加密數(shù)據(jù)

byte);

}

console.writeline();

//上面演示了如何進(jìn)行加密，下面演示如何進(jìn)行解密

symmetricstreamdecryptor ssd = des.createdecryptor();

cms = new cryptomemorystream();

ssd.setsink(cms);

ssd.write(encrypteddata);

ssd.closestream();

byte decryptedchararray = utf8encoding.getchars(decrypteddata);

console.writeline("解密后數(shù)據(jù)：");

console.write(decryptedchararray);

console.writeline();

}

編譯：

d:\csharpcsc des_demo.cs

microsoft (r) c# compiler version 7.00.8905

運(yùn)行實(shí)例：

d:\csharpdes_demo.exe 使用c#編寫des加密程序的framework

加密結(jié)果：

3d 22 64 c6 57 d1 c4 c3 cf 77 ce 2f d0 e1 78 2a 4d ed 7a a8 83 f9 0e 14 e1 ba 38

7b 06 41 8d b5 e9 3f 00 0d c3 28 d1 f9 6d 17 4b 6e a7 41 68 40

新聞標(biāo)題：c語(yǔ)言des函數(shù) c語(yǔ)言里面的函數(shù)
文章起源：http://bm7419.com/article4/ddejdoe.html

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