免费浏览的网站入口,建e网全屋设计效果图,中国建设部官方网站资格证查询,百度推广网站最近在研究国密算法#xff0c;主要分为#xff1a;SM2、SM3、SM4。其中SM2为非对称加密算法#xff0c;SM3为哈希摘要算法#xff0c;SM4为对称加密算法。
1.在SM4算法源文件中主要有以下几个函数#xff1a;
void sm4_setkey_enc( sm4_context *ctx, unsigned char ke…最近在研究国密算法主要分为SM2、SM3、SM4。其中SM2为非对称加密算法SM3为哈希摘要算法SM4为对称加密算法。
1.在SM4算法源文件中主要有以下几个函数
void sm4_setkey_enc( sm4_context *ctx, unsigned char key[16] );
void sm4_setkey_dec( sm4_context *ctx, unsigned char key[16] );
void sm4_crypt_ecb( sm4_context *ctx, int mode,int length, unsigned char *input,unsigned char *output);
void sm4_crypt_cbc( sm4_context *ctx, int mode, int length,unsigned char iv[16], unsigned char *input,unsigned char *output );
2.还有一个重要的结构体
/*** \brief SM4 context structure*/
typedef struct
{int mode; /*! encrypt/decrypt */unsigned long sk[32]; /*! SM4 subkeys */
}
sm4_context;
结构体中的mode参数控制加密还是解密其中mode1为加密mode0为解密。数组sk为轮密钥。SM4为32轮加密变换。
3.加密函数 /*** \brief SM4 key schedule (128-bit, encryption)** \param ctx SM4 context to be initialized* \param key 16-byte secret key*/
void sm4_setkey_enc(sm4_context *ctxunsigned char key[16])
这个函数是用来加密明文的一个参数分别为sm4_context *ctx和一个key。
其内部会调用static void sm4_setkey( unsigned long SK[32], unsigned char key[16] )函数
这个函数是用来设置密钥的这个函数内部会对当前传入的主密钥进行32轮的迭代每次迭代的轮密钥都被存放到ctx结构中的sk数组中。
4.解密函数
/*** \brief SM4 key schedule (128-bit, decryption)** \param ctx SM4 context to be initialized* \param key 16-byte secret key*/
void sm4_setkey_dec( sm4_context *ctx, unsigned char key[16] );这个函数为解密函数是进行密文解密的。参数与加密函数一样。
5.ECB工作模式
/*** \brief SM4-ECB block encryption/decryption* \param ctx SM4 context* \param mode SM4_ENCRYPT or SM4_DECRYPT* \param length length of the input data* \param input input block* \param output output block*/
void sm4_crypt_ecb( sm4_context *ctx, int mode, int length,unsigned char *input,unsigned char *output);
这个函数的作用是使用ECB模式ECBElectronic Codebook电码本ECB模式是分组密码的一种最基本的工作模式。根据length的长度来进行循环每次循环都调用sm4_one_round进行加密或者解密到底是加密还是解密主要是根据第二个参数Mode来进行决定。
6. CBC工作模式
/*** \brief SM4-CBC buffer encryption/decryption* \param ctx SM4 context* \param mode SM4_ENCRYPT or SM4_DECRYPT* \param length length of the input data* \param iv initialization vector (updated after use)* \param input buffer holding the input data* \param output buffer holding the output data*/
void sm4_crypt_cbc( sm4_context *ctx, int mode, int length,unsigned char iv[16],unsigned char *input,unsigned char *output );
以上就是SM4加密算法的函数简介具体的代码实现可不用掌握下面是完整代码
7.sm4.h头文件
/*** \file sm4.h*/
#ifndef XYSSL_SM4_H
#define XYSSL_SM4_H#define SM4_ENCRYPT 1
#define SM4_DECRYPT 0/*** \brief SM4 context structure*/
typedef struct
{int mode; /*! encrypt/decrypt */unsigned long sk[32]; /*! SM4 subkeys */
}
sm4_context;#ifdef __cplusplus
extern C {
#endif/*** \brief SM4 key schedule (128-bit, encryption)** \param ctx SM4 context to be initialized* \param key 16-byte secret key*/
void sm4_setkey_enc( sm4_context *ctx, unsigned char key[16] );/*** \brief SM4 key schedule (128-bit, decryption)** \param ctx SM4 context to be initialized* \param key 16-byte secret key*/
void sm4_setkey_dec( sm4_context *ctx, unsigned char key[16] );/*** \brief SM4-ECB block encryption/decryption* \param ctx SM4 context* \param mode SM4_ENCRYPT or SM4_DECRYPT* \param length length of the input data* \param input input block* \param output output block*/
void sm4_crypt_ecb( sm4_context *ctx,int mode,int length,unsigned char *input,unsigned char *output);/*** \brief SM4-CBC buffer encryption/decryption* \param ctx SM4 context* \param mode SM4_ENCRYPT or SM4_DECRYPT* \param length length of the input data* \param iv initialization vector (updated after use)* \param input buffer holding the input data* \param output buffer holding the output data*/
void sm4_crypt_cbc( sm4_context *ctx,int mode,int length,unsigned char iv[16],unsigned char *input,unsigned char *output );#ifdef __cplusplus
}
#endif#endif /* sm4.h */8.sm4.c源文件
/** SM4 Encryption alogrithm (SMS4 algorithm)* GM/T 0002-2012 Chinese National Standard ref:http://www.oscca.gov.cn/ * thanks to Xyssl* thnaks and refers to http://hi.baidu.com/numax/blog/item/80addfefddfb93e4cf1b3e61.html* author:goldboar* email:goldboar163.com* 2012-4-20*/// Test vector 1
// plain: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
// key: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
// round key and temp computing result:
// rk[ 0] f12186f9 X[ 0] 27fad345
// rk[ 1] 41662b61 X[ 1] a18b4cb2
// rk[ 2] 5a6ab19a X[ 2] 11c1e22a
// rk[ 3] 7ba92077 X[ 3] cc13e2ee
// rk[ 4] 367360f4 X[ 4] f87c5bd5
// rk[ 5] 776a0c61 X[ 5] 33220757
// rk[ 6] b6bb89b3 X[ 6] 77f4c297
// rk[ 7] 24763151 X[ 7] 7a96f2eb
// rk[ 8] a520307c X[ 8] 27dac07f
// rk[ 9] b7584dbd X[ 9] 42dd0f19
// rk[10] c30753ed X[10] b8a5da02
// rk[11] 7ee55b57 X[11] 907127fa
// rk[12] 6988608c X[12] 8b952b83
// rk[13] 30d895b7 X[13] d42b7c59
// rk[14] 44ba14af X[14] 2ffc5831
// rk[15] 104495a1 X[15] f69e6888
// rk[16] d120b428 X[16] af2432c4
// rk[17] 73b55fa3 X[17] ed1ec85e
// rk[18] cc874966 X[18] 55a3ba22
// rk[19] 92244439 X[19] 124b18aa
// rk[20] e89e641f X[20] 6ae7725f
// rk[21] 98ca015a X[21] f4cba1f9
// rk[22] c7159060 X[22] 1dcdfa10
// rk[23] 99e1fd2e X[23] 2ff60603
// rk[24] b79bd80c X[24] eff24fdc
// rk[25] 1d2115b0 X[25] 6fe46b75
// rk[26] 0e228aeb X[26] 893450ad
// rk[27] f1780c81 X[27] 7b938f4c
// rk[28] 428d3654 X[28] 536e4246
// rk[29] 62293496 X[29] 86b3e94f
// rk[30] 01cf72e5 X[30] d206965e
// rk[31] 9124a012 X[31] 681edf34
// cypher: 68 1e df 34 d2 06 96 5e 86 b3 e9 4f 53 6e 42 46
//
// test vector 2
// the same key and plain 1000000 times coumpting
// plain: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
// key: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10
// cypher: 59 52 98 c7 c6 fd 27 1f 04 02 f8 04 c3 3d 3f 66#include sm4.h
#include string.h
#include stdio.h/** 32-bit integer manipulation macros (big endian)*/
#ifndef GET_ULONG_BE
#define GET_ULONG_BE(n,b,i) \
{ \(n) ( (unsigned long) (b)[(i) ] 24 ) \| ( (unsigned long) (b)[(i) 1] 16 ) \| ( (unsigned long) (b)[(i) 2] 8 ) \| ( (unsigned long) (b)[(i) 3] ); \
}
#endif#ifndef PUT_ULONG_BE
#define PUT_ULONG_BE(n,b,i) \
{ \(b)[(i) ] (unsigned char) ( (n) 24 ); \(b)[(i) 1] (unsigned char) ( (n) 16 ); \(b)[(i) 2] (unsigned char) ( (n) 8 ); \(b)[(i) 3] (unsigned char) ( (n) ); \
}
#endif/**rotate shift left marco definition**/
#define SHL(x,n) (((x) 0xFFFFFFFF) n)
#define ROTL(x,n) (SHL((x),n) | ((x) (32 - n)))#define SWAP(a,b) { unsigned long t a; a b; b t; t 0; }/** Expanded SM4 S-boxes/* Sbox table: 8bits input convert to 8 bits output*/static const unsigned char SboxTable[16][16]
{
{0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05},
{0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99},
{0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62},
{0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6},
{0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8},
{0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35},
{0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87},
{0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e},
{0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1},
{0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3},
{0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f},
{0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51},
{0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8},
{0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0},
{0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84},
{0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48}
};/* System parameter */
static const unsigned long FK[4] {0xa3b1bac6,0x56aa3350,0x677d9197,0xb27022dc};/* fixed parameter */
static const unsigned long CK[32]
{
0x00070e15,0x1c232a31,0x383f464d,0x545b6269,
0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,
0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,
0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,
0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,
0x30373e45,0x4c535a61,0x686f767d,0x848b9299,
0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,
0x10171e25,0x2c333a41,0x484f565d,0x646b7279
};/** private function:* look up in SboxTable and get the related value.* args: [in] inch: 0x00~0xFF (8 bits unsigned value).*/
static unsigned char sm4Sbox(unsigned char inch)
{unsigned char *pTable (unsigned char *)SboxTable;unsigned char retVal (unsigned char)(pTable[inch]);return retVal;
}/** private F(Lt) function:* T algorithm L algorithm t algorithm.* args: [in] a: a is a 32 bits unsigned value;* return: c: c is calculated with line algorithm L and nonline algorithm t*/
static unsigned long sm4Lt(unsigned long ka)
{unsigned long bb 0;unsigned long c 0;unsigned char a[4];unsigned char b[4];PUT_ULONG_BE(ka,a,0)b[0] sm4Sbox(a[0]);b[1] sm4Sbox(a[1]);b[2] sm4Sbox(a[2]);b[3] sm4Sbox(a[3]);GET_ULONG_BE(bb,b,0)c bb^(ROTL(bb, 2))^(ROTL(bb, 10))^(ROTL(bb, 18))^(ROTL(bb, 24));return c;
}/** private F function:* Calculating and getting encryption/decryption contents.* args: [in] x0: original contents;* args: [in] x1: original contents;* args: [in] x2: original contents;* args: [in] x3: original contents;* args: [in] rk: encryption/decryption key;* return the contents of encryption/decryption contents.*/
static unsigned long sm4F(unsigned long x0, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long rk)
{return (x0^sm4Lt(x1^x2^x3^rk));
}/* private function:* Calculating round encryption key.* args: [in] a: a is a 32 bits unsigned value;* return: sk[i]: i{0,1,2,3,...31}.*/
static unsigned long sm4CalciRK(unsigned long ka)
{unsigned long bb 0;unsigned long rk 0;unsigned char a[4];unsigned char b[4];PUT_ULONG_BE(ka,a,0)b[0] sm4Sbox(a[0]);b[1] sm4Sbox(a[1]);b[2] sm4Sbox(a[2]);b[3] sm4Sbox(a[3]);GET_ULONG_BE(bb,b,0)rk bb^(ROTL(bb, 13))^(ROTL(bb, 23));return rk;
}static void sm4_setkey( unsigned long SK[32], unsigned char key[16] )
{unsigned long MK[4];unsigned long k[36];unsigned long i 0;GET_ULONG_BE( MK[0], key, 0 );GET_ULONG_BE( MK[1], key, 4 );GET_ULONG_BE( MK[2], key, 8 );GET_ULONG_BE( MK[3], key, 12 );k[0] MK[0]^FK[0];k[1] MK[1]^FK[1];k[2] MK[2]^FK[2];k[3] MK[3]^FK[3];for(; i32; i){k[i4] k[i] ^ (sm4CalciRK(k[i1]^k[i2]^k[i3]^CK[i]));SK[i] k[i4];}}/** SM4 standard one round processing**/
static void sm4_one_round( unsigned long sk[32],unsigned char input[16],unsigned char output[16] )
{unsigned long i 0;unsigned long ulbuf[36];memset(ulbuf, 0, sizeof(ulbuf));GET_ULONG_BE( ulbuf[0], input, 0 )GET_ULONG_BE( ulbuf[1], input, 4 )GET_ULONG_BE( ulbuf[2], input, 8 )GET_ULONG_BE( ulbuf[3], input, 12 )while(i32){ulbuf[i4] sm4F(ulbuf[i], ulbuf[i1], ulbuf[i2], ulbuf[i3], sk[i]);
// #ifdef _DEBUG
// printf(rk(%02d) 0x%08x, X(%02d) 0x%08x \n,i,sk[i], i, ulbuf[i4] );
// #endifi;}PUT_ULONG_BE(ulbuf[35],output,0);PUT_ULONG_BE(ulbuf[34],output,4);PUT_ULONG_BE(ulbuf[33],output,8);PUT_ULONG_BE(ulbuf[32],output,12);
}/** SM4 key schedule (128-bit, encryption)*/
void sm4_setkey_enc( sm4_context *ctx, unsigned char key[16] )
{ctx-mode SM4_ENCRYPT;sm4_setkey( ctx-sk, key );
}/** SM4 key schedule (128-bit, decryption)*/
void sm4_setkey_dec( sm4_context *ctx, unsigned char key[16] )
{int i;ctx-mode SM4_ENCRYPT;sm4_setkey( ctx-sk, key );for( i 0; i 16; i ){SWAP( ctx-sk[ i ], ctx-sk[ 31-i] );}
}/** SM4-ECB block encryption/decryption*/void sm4_crypt_ecb( sm4_context *ctx,int mode,int length,unsigned char *input,unsigned char *output)
{while( length 0 ){sm4_one_round( ctx-sk, input, output );input 16;output 16;length - 16;}}/** SM4-CBC buffer encryption/decryption*/
void sm4_crypt_cbc( sm4_context *ctx,int mode,int length,unsigned char iv[16],unsigned char *input,unsigned char *output )
{int i;unsigned char temp[16];if( mode SM4_ENCRYPT ){while( length 0 ){for( i 0; i 16; i )output[i] (unsigned char)( input[i] ^ iv[i] );sm4_one_round( ctx-sk, output, output );memcpy( iv, output, 16 );input 16;output 16;length - 16;}}else /* SM4_DECRYPT */{while( length 0 ){memcpy( temp, input, 16 );sm4_one_round( ctx-sk, input, output );for( i 0; i 16; i )output[i] (unsigned char)( output[i] ^ iv[i] );memcpy( iv, temp, 16 );input 16;output 16;length - 16;}}
}9.测试文件
/** SM4/SMS4 algorithm test programme* 2012-4-21*/#include string.h
#include stdio.h
#include sm4.hint main()
{unsigned char key[16] {0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10};unsigned char input[16] {0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10};unsigned char output[16];sm4_context ctx;unsigned long i;//encrypt standard testing vectorsm4_setkey_enc(ctx,key);sm4_crypt_ecb(ctx,1,16,input,output);for(i0;i16;i)printf(%02x , output[i]);printf(\n);//decrypt testingsm4_setkey_dec(ctx,key);sm4_crypt_ecb(ctx,0,16,output,output);for(i0;i16;i)printf(%02x , output[i]);printf(\n);//decrypt 1M times testing vector based on standards.i 0;sm4_setkey_enc(ctx,key);while (i1000000) {sm4_crypt_ecb(ctx,1,16,input,input);i;}for(i0;i16;i)printf(%02x , input[i]);printf(\n);return 0;
}
