sm2,sm3,sm4国密算法的纯c语言版本，使用于任何嵌入式平台

国密即国家密码局认定的国产密码算法。主要有SM1，SM2，SM3，SM4。密钥长度和分组长度均为128位。

SM1 为对称加密。其加密强度与AES相当。该算法不公开，调用该算法时，需要通过加密芯片的接口进行调用。

SM2为非对称加密，基于ECC。该算法已公开。由于该算法基于ECC，故其签名速度与秘钥生成速度都快于RSA。ECC 256位（SM2采用的就是ECC 256位的一种）安全强度比RSA 2048位高，但运算速度快于RSA。

SM3 消息摘要。可以用MD5作为对比理解。该算法已公开。校验结果为256位。

SM4 无线局域网标准的分组数据算法。对称加密，密钥长度和分组长度均为128位。

由于SM1、SM4加解密的分组大小为128bit，故对消息进行加解密时，若消息长度过长，需要进行分组，要消息长度不足，则要进行填充。

SM2，SM3，SM4的相关文档可以参考如下链接：

http://218.241.108.63/wiki/index.php/首页

SM2，SM3，SM4的C代码如下：使用了openssl开源库。

http://files.cnblogs.com/files/TaiYangXiManYouZhe/Sm2_sm3_sm4_c%E8%AF%AD%E8%A8%80%E5%AE%9E%E7%8E%B0.zip

当使用特定的芯片进行SM1或其他国密算法加密时，若用多个线程调用加密卡的API时，要考虑芯片对于多线程的支持情况。

以下为不使用openssl库的另一种实现方案，基于Miracl大数运算库，可移植。

主要难点就是移植Miracl库，裁剪配置，测试加解密算法。针对不同平台如32位或64位，以及平台的大小端进行配置。

如果Miracl库移植ok了，那么基于Miracl库的sm2算法应没多大问题。

Miracl库里文件较多，且从官网下载的代码，在linux系统上是很容易编译。

但是想用在单片机上，需要一些移植和配置。

只需要包含需要的文件就行了。

以下是编译过程。

然后需要新建一个sm2.c文件、sm2.h，用于实现sm2功能函数；一个sm3.c文件、一个sm3.h文件，用于实现sm3功能函数（之所以要增加sm3的功能是因为sm2算法中需要sm3计算hash值功能。下面给出生成密钥对的示例:

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#include <memory.h>
#include <time.h>
#include "sm2.h"

#define SM2_PAD_ZERO TRUE
#define SM2_DEBUG   0
struct FPECC{
char *p;
char *a;
char *b;
char *n;
char *x;
char *y;
};
/*SM2*/
struct FPECC Ecc256 = {
"8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
"8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
};
unsigned char radom1[] = { 0x4C,0x62,0xEE,0xFD,0x6E,0xCF,0xC2,0xB9,0x5B,0x92,0xFD,0x6C,0x3D,0x95,0x75,0x14,0x8A,0xFA,0x17,0x42,0x55,0x46,0xD4,0x90,0x18,0xE5,0x38,0x8D,0x49,0xDD,0x7B,0x4F };
void PrintBuf(unsigned char *buf, int	buflen)
{
	int i;
	for (i = 0; i < buflen; i++) {
		if (i % 32 != 31)
			printf("%02x", buf[i]);
		else
			printf("%02xn", buf[i]);
	}
	printf("n");
	//return 0;
}
void Printch(unsigned char *buf, int	buflen)
{
	int i;
	for (i = 0; i < buflen; i++) {
		if (i % 32 != 31)
			printf("%c", buf[i]);
		else
			printf("%cn", buf[i]);
	}
	printf("n");
	//return 0;
}

void sm2_keygen(unsigned char *wx, int *wxlen, unsigned char *wy, int *wylen,unsigned char *privkey, int *privkeylen)
{

	struct FPECC *cfig = &Ecc256;
	epoint *g;
    big a,b,p,n,x,y,key1;
    miracl *mip = mirsys(20,0);
    mip->IOBASE = 16;
    p = mirvar(0);
	a = mirvar(0);
    b = mirvar(0);
    n = mirvar(0);
    x = mirvar(0);
    y = mirvar(0);
    key1 = mirvar(0);
    cinstr(p,cfig->p);
	cinstr(a,cfig->a);
    cinstr(b,cfig->b);
	cinstr(n,cfig->n);
	cinstr(x,cfig->x);
    cinstr(y,cfig->y);
	ecurve_init(a,b,p,MR_PROJECTIVE);
    g = epoint_init();
    epoint_set(x,y,0,g); 
    irand(time(NULL));
    bigrand(n,key1);   ////私钥db
    ecurve_mult(key1,g,g); //计算Pb
    epoint_get(g,x,y);
    *wxlen = big_to_bytes(32, x, (char *)wx, TRUE);
   	*wylen = big_to_bytes(32, y, (char *)wy, TRUE);
	*privkeylen = big_to_bytes(32, key1, (char *)privkey, TRUE);
	mirkill(key1);
	mirkill(p);
	mirkill(a);
	mirkill(b);
	mirkill(n);
	mirkill(x);
	mirkill(y);
	epoint_free(g);
	mirexit();
}
int kdf(unsigned char *zl, unsigned char *zr, int klen, unsigned char *kbuf)
{
	/*
	return 0: kbuf = 0, 不可
		   1: kbuf 可
	*/
	unsigned char buf[70];
	unsigned char digest[32];
	unsigned int ct = 0x00000001; //初始化一个32比特构成的计数器ct=0x00000001
	int i, m, n;
	unsigned char *p;
	memcpy(buf, zl, 32);
	memcpy(buf+32, zr, 32);
	m = klen / 32;
	n = klen % 32;
	p = kbuf;
	for(i = 0; i < m; i++)
	{
		buf[64] = (ct >> 24) & 0xFF;
		buf[65] = (ct >> 16) & 0xFF;
		buf[66] = (ct >> 8) & 0xFF;
		buf[67] = ct & 0xFF;
		sm3(buf, 68, p);
		p += 32;
		ct++;
	}
	/*对i从1到?klen/v?执行：b.1)计算Hai=Hv(Z ∥ ct)；b.2) ct++*/
	if(n != 0)
	{
		buf[64] = (ct >> 24) & 0xFF;
		buf[65] = (ct >> 16) & 0xFF;
		buf[66] = (ct >> 8) & 0xFF;
		buf[67] = ct & 0xFF;
		sm3(buf, 68, digest);
	}
	/*若klen/v是整数，令Ha!?klen/v? = Ha?klen/v?，否则令Ha!?klen/v?为Ha?klen/v?最左边的(klen ?
(v × ?klen/v?))比特*/
	memcpy(p, digest, n);
	/*令K = Ha1||Ha2||  ||*/
	for(i = 0; i < klen; i++)
	{
		if(kbuf[i] != 0)
			break;
	}

	if(i < klen)
		return 1;
	else
		return 0;

}

int sm2_encrypt(unsigned char *msg,int msglen, unsigned char *wx,int wxlen, unsigned char *wy,int wylen, unsigned char *outmsg)
{

	struct FPECC *cfig = &Ecc256;
    big x2, y2, c1, c2, k;
    big a,b,p,n,x,y;
    epoint *g, *w;
	int ret = -1;
	int i;
	unsigned char zl[32], zr[32];
	unsigned char *tmp;
    miracl *mip;
	tmp = malloc(msglen+64);
	if(tmp == NULL)
		return -1;
	mip = mirsys(20, 0);
	mip->IOBASE = 16;
    p=mirvar(0);
	a=mirvar(0);
    b=mirvar(0);
    n=mirvar(0);
    x=mirvar(0);
    y=mirvar(0);
	k=mirvar(0);
	x2=mirvar(0); 
	y2=mirvar(0); 
	c1=mirvar(0); 
	c2=mirvar(0); 
    cinstr(p,cfig->p);
	cinstr(a,cfig->a);
    cinstr(b,cfig->b);
	cinstr(n,cfig->n);
	cinstr(x,cfig->x);
    cinstr(y,cfig->y);
	ecurve_init(a,b,p,MR_PROJECTIVE);
    g=epoint_init();
	w=epoint_init();
    epoint_set(x,y,0,g);
	bytes_to_big(wxlen,(char *)wx,x);
	bytes_to_big(wylen,(char *)wy,y);
	epoint_set(x,y,0,w);
    irand(time(NULL));
sm2_encrypt_again:
#if SM2_DEBUG
	bytes_to_big(32, (char *)radom1, k);
#else
	do
	{
		bigrand(n, k);
	} 
	while (k->len == 0);
#endif
	ecurve_mult(k, g, g);
	epoint_get(g, c1, c2);
	big_to_bytes(32, c1, (char *)outmsg, TRUE);
	big_to_bytes(32, c2, (char *)outmsg+32, TRUE);
	//计算椭圆曲线点C1
	if(point_at_infinity(w))
		goto exit_sm2_encrypt;
	//计算椭圆曲线点S
	ecurve_mult(k, w, w);
	epoint_get(w, x2, y2);
	big_to_bytes(32, x2, (char *)zl, TRUE);
	big_to_bytes(32, y2, (char *)zr, TRUE);
	//计算椭圆曲线点[k]PB
	if (kdf(zl, zr, msglen, outmsg+64) == 0)
		goto sm2_encrypt_again;
	//计算t = KDF,如果t全零,返回A1
	for(i = 0; i < msglen; i++)
	{
		outmsg[64+i] ^= msg[i];
	}
	//计算C2
	memcpy(tmp, zl, 32);
	memcpy(tmp+32, msg, msglen);
	memcpy(tmp+32+msglen, zr, 32);
	sm3(tmp, 64+msglen, &outmsg[64+msglen]);
	//计算C3
	ret = msglen+64+32;
	printf("key:");
	cotnum(k, stdout);
	//输出C,C在outmsg
exit_sm2_encrypt:
	mirkill(x2);  
	mirkill(y2);  
	mirkill(c1);  
	mirkill(c2);  
	mirkill(k);
	mirkill(a);  
	mirkill(b);
    mirkill(p);  
	mirkill(n);  
	mirkill(x);
	mirkill(y);
    epoint_free(g); 
	epoint_free(w);
	mirexit();
	free(tmp);
	return ret;
}


int sm2_decrypt(unsigned char *msg,int msglen, unsigned char *privkey, int privkeylen, unsigned char *outmsg)
{

	struct FPECC *cfig = &Ecc256;
    big x2, y2, c, k;
    big a,b,p,n,x,y,key1;
    epoint *g;
	unsigned char c3[32];
	unsigned char zl[32], zr[32];
	int i, ret = -1;
	unsigned char *tmp;
    miracl *mip;
	if(msglen < 96)
		return 0;
	msglen -= 96;
	tmp = malloc(msglen+64);
	if(tmp == NULL)
		return 0;
	mip = mirsys(20, 0);
	mip->IOBASE = 16;
	x2=mirvar(0); 
	y2=mirvar(0); 
	c=mirvar(0); 
	k = mirvar(0);
    p = mirvar(0);
	a = mirvar(0);
    b = mirvar(0);
    n = mirvar(0);
    x = mirvar(0);
    y = mirvar(0);
    key1 = mirvar(0);
    bytes_to_big(privkeylen,(char *)privkey,key1);
    cinstr(p,cfig->p);
	cinstr(a,cfig->a);
    cinstr(b,cfig->b);
	cinstr(n,cfig->n);
	cinstr(x,cfig->x);
    cinstr(y,cfig->y);
	ecurve_init(a,b,p,MR_PROJECTIVE);
    g = epoint_init();
	bytes_to_big(32, (char *)msg, x);
	bytes_to_big(32, (char *)msg+32, y);
    if(!epoint_set(x,y,0,g))
		goto exit_sm2_decrypt;  //检验是否为椭圆曲线
	if(point_at_infinity(g))
		goto exit_sm2_decrypt;  //计算S
	ecurve_mult(key1, g, g);
	epoint_get(g, x2, y2);	
	big_to_bytes(32, x2, (char *)zl, TRUE);
	big_to_bytes(32, y2, (char *)zr, TRUE); //计算[db]c1
	if (kdf(zl, zr, msglen, outmsg) == 0)
		goto exit_sm2_decrypt;    //计算t
	for(i = 0; i < msglen; i++)
	{
		outmsg[i] ^= msg[i+64];
	}   //计算M到outsmg
	memcpy(tmp, zl, 32);
	memcpy(tmp+32, outmsg, msglen);
	memcpy(tmp+32+msglen, zr, 32);
	sm3(tmp, 64+msglen, c3);//计算u
	if(memcmp(c3, msg+64+msglen, 32) != 0)
		goto exit_sm2_decrypt;
	ret =  msglen;
exit_sm2_decrypt:
	mirkill(x2);  
	mirkill(y2);  
	mirkill(c);  
	mirkill(k);
	mirkill(p);
	mirkill(a); 
	mirkill(b); 
	mirkill(n); 
	mirkill(x); 
	mirkill(y); 
	mirkill(key1);
    epoint_free(g);
	mirexit();
	free(tmp);
	return ret;
}
int main()
{
	printf("sm2 test....n");
	
	
	unsigned char dB[] = { 0x16,0x49,0xAB,0x77,0xA0,0x06,0x37,0xBD,0x5E,0x2E,0xFE,0x28,0x3F,0xBF,0x35,0x35,0x34,0xAA,0x7F,0x7C,0xB8,0x94,0x63,0xF2,0x08,0xDD,0xBC,0x29,0x20,0xBB,0x0D,0xA0 };
	unsigned char xB[] = { 0x43,0x5B,0x39,0xCC,0xA8,0xF3,0xB5,0x08,0xC1,0x48,0x8A,0xFC,0x67,0xBE,0x49,0x1A,0x0F,0x7B,0xA0,0x7E,0x58,0x1A,0x0E,0x48,0x49,0xA5,0xCF,0x70,0x62,0x8A,0x7E,0x0A };
	unsigned char yB[] = { 0x75,0xDD,0xBA,0x78,0xF1,0x5F,0xEE,0xCB,0x4C,0x78,0x95,0xE2,0xC1,0xCD,0xF5,0xFE,0x01,0xDE,0xBB,0x2C,0xDB,0xAD,0xF4,0x53,0x99,0xCC,0xF7,0x7B,0xBA,0x07,0x6A,0x42 };
	unsigned char tx[256];
	unsigned char etx[256];
	unsigned char mtx[256];
	FILE *fp=0;
	int wxlen, wylen, privkeylen,len;
	//fopen(&fp, "5.txt", "r");
	//len=fread_s(tx, 256,sizeof(unsigned char), 256, fp);
	fp = fopen("5.txt","r");
	len=fread(tx,1,256,fp);
	tx[len] = "";
	sm2_keygen(xB, &wxlen, yB, &wylen, dB, &privkeylen);
	printf("dB: ");
	PrintBuf(dB, 32);
	printf("xB: ");
	PrintBuf(xB, 32);
	printf("yB: ");
	PrintBuf(yB, 32);
	sm2_encrypt(tx,len,xB,32,yB,32,etx);
	printf("n``````````````````this is encrypt```````````````````n");
	PrintBuf(etx, 64 +len + 32);
	printf("n``````````````````this is decrypt```````````````````n");
	sm2_decrypt(etx,64+len+32,dB,32,mtx);
	if(sm2_decrypt(etx,64+len+32,dB,32,mtx) < 0)
		printf("sm2_decrypt error!n");
	else
	{
		PrintBuf(mtx, len);
		Printch(mtx, len);
	}

	printf("n``````````````````this is end```````````````````````n");
	return 0;
}

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

#include "sm3.h"

#define nl2c(l,c)	(*((c)++) = (unsigned char)(((l) >> 24) & 0xff), 
					 *((c)++) = (unsigned char)(((l) >> 16) & 0xff), 
					 *((c)++) = (unsigned char)(((l) >> 8)  & 0xff), 
					 *((c)++) = (unsigned char)(((l)    )   & 0xff))

#define c_2_nl(c)	((*(c) << 24) | (*(c+1) << 16) | (*(c+2) << 8) | *(c+3))
#define ROTATE(X, C) (((X) << (C)) | ((X) >> (32 - (C))))

#define TH 0x79cc4519
#define TL 0x7a879d8a
#define FFH(X, Y, Z) ((X) ^ (Y) ^ (Z))
#define FFL(X, Y, Z) (((X) & (Y)) | ((X) & (Z)) | ((Y) & (Z)))
#define GGH(X, Y, Z) ((X) ^ (Y) ^ (Z))
#define GGL(X, Y, Z) (((X) & (Y)) | ((~X) & (Z)))
#define P0(X)  ((X) ^ (((X) << 9) | ((X) >> 23)) ^ (((X) << 17) | ((X) >> 15)))
#define P1(X)  ((X) ^ (((X) << 15) | ((X) >> 17)) ^ (((X) << 23) | ((X) >> 9)))

#define DEBUG_SM3 0


void sm3_block(SM3_CTX *ctx)
{
	register int j, k;
	register unsigned long t;
	register unsigned long ss1, ss2, tt1, tt2;
	register unsigned long a, b, c, d, e, f, g, h;
	unsigned long w[132];


	for(j = 0; j < 16; j++)
		w[j] = ctx->data[j];

	for(j = 16; j < 68; j++)
	{
		t = w[j-16] ^ w[j-9] ^ ROTATE(w[j-3], 15);
		w[j] = P1(t) ^ ROTATE(w[j-13], 7) ^ w[j-6];
	}


	for(j = 0, k = 68; j < 64; j++, k++)
	{
		w[k] = w[j] ^ w[j+4];
	}


	a = ctx->h[0];
	b = ctx->h[1];
	c = ctx->h[2];
	d = ctx->h[3];
	e = ctx->h[4];
	f = ctx->h[5];
	g = ctx->h[6];
	h = ctx->h[7];

	for(j = 0; j < 16; j++)
	{
		ss1 = ROTATE(ROTATE(a, 12) +  e + ROTATE(TH, j), 7);
		ss2 = ss1 ^ ROTATE(a, 12);
		tt1 = FFH(a, b, c) + d + ss2 + w[68 + j];
		tt2 = GGH(e, f, g) + h + ss1 + w[j];

		d = c; 
		c = ROTATE(b, 9);
		b = a;
		a = tt1;

		h = g;
		g = ROTATE(f, 19);
		f = e;
		e = P0(tt2);
	}


	for(j = 16; j < 33; j++)
	{
		ss1 = ROTATE(ROTATE(a, 12) +  e + ROTATE(TL, j), 7);
		ss2 = ss1 ^ ROTATE(a, 12);
		tt1 = FFL(a, b, c) + d + ss2 + w[68 + j];
		tt2 = GGL(e, f, g) + h + ss1 + w[j];

		d = c;
		c = ROTATE(b, 9);
		b = a;
		a = tt1;

		h = g;
		g = ROTATE(f, 19);
		f = e;
		e = P0(tt2);
	}

	for(j = 33; j < 64; j++)
	{
		ss1 = ROTATE(ROTATE(a, 12) +  e + ROTATE(TL, (j-32)), 7);
		ss2 = ss1 ^ ROTATE(a, 12);
		tt1 = FFL(a, b, c) + d + ss2 + w[68 + j];
		tt2 = GGL(e, f, g) + h + ss1 + w[j];

		d = c;
		c = ROTATE(b, 9);
		b = a;
		a = tt1;

		h = g;
		g = ROTATE(f, 19);
		f = e;
		e = P0(tt2);
	}

	ctx->h[0]  ^=  a ;
	ctx->h[1]  ^=  b ;
	ctx->h[2]  ^=  c ;
	ctx->h[3]  ^=  d ;
	ctx->h[4]  ^=  e ;
	ctx->h[5]  ^=  f ;
	ctx->h[6]  ^=  g ;
	ctx->h[7]  ^=  h ;

}


void SM3_Init (SM3_CTX *ctx)
{
	ctx->h[0] = 0x7380166fUL;
	ctx->h[1] = 0x4914b2b9UL;
	ctx->h[2] = 0x172442d7UL;
	ctx->h[3] = 0xda8a0600UL;
	ctx->h[4] = 0xa96f30bcUL;
	ctx->h[5] = 0x163138aaUL;
	ctx->h[6] = 0xe38dee4dUL;
	ctx->h[7] = 0xb0fb0e4eUL;
	ctx->Nl   = 0;
	ctx->Nh   = 0;
	ctx->num  = 0;
}

void SM3_Update(SM3_CTX *ctx, const void *data, unsigned int len)
{
	unsigned char *d;
	unsigned long l;
	int i, sw, sc;


	if (len == 0)
		return;

	l = (ctx->Nl + (len << 3)) & 0xffffffffL;
	if (l < ctx->Nl) /* overflow */
		ctx->Nh++;
	ctx->Nh += (len >> 29);
	ctx->Nl = l;

	d = (unsigned char *)data;

	while (len >= SM3_CBLOCK)
	{
		ctx->data[0] = c_2_nl(d);
		d += 4;
		ctx->data[1] = c_2_nl(d);
		d += 4;
		ctx->data[2] = c_2_nl(d);
		d += 4;
		ctx->data[3] = c_2_nl(d);
		d += 4;
		ctx->data[4] = c_2_nl(d);
		d += 4;
		ctx->data[5] = c_2_nl(d);
		d += 4;
		ctx->data[6] = c_2_nl(d);
		d += 4;
		ctx->data[7] = c_2_nl(d);
		d += 4;
		ctx->data[8] = c_2_nl(d);
		d += 4;
		ctx->data[9] = c_2_nl(d);
		d += 4;
		ctx->data[10] = c_2_nl(d);
		d += 4;
		ctx->data[11] = c_2_nl(d);
		d += 4;
		ctx->data[12] = c_2_nl(d);
		d += 4;
		ctx->data[13] = c_2_nl(d);
		d += 4;
		ctx->data[14] = c_2_nl(d);
		d += 4;
		ctx->data[15] = c_2_nl(d);
		d += 4;

		sm3_block(ctx);
		len -= SM3_CBLOCK;
	}

	if(len > 0)
	{
		memset(ctx->data, 0, 64);
		ctx->num = len + 1;
		sw = len >> 2;
		sc = len & 0x3;

		for(i = 0; i < sw; i++)
		{
			ctx->data[i] = c_2_nl(d);
			d += 4;
		}

		switch(sc)
		{
			case 0:
				ctx->data[i] = 0x80000000;
				break;
			case 1:
				ctx->data[i] = (d[0] << 24) | 0x800000;
				break;
			case 2:
				ctx->data[i] = (d[0] << 24) | (d[1] << 16) | 0x8000;
				break;
			case 3:
				ctx->data[i] = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | 0x80;
				break;
		}

	}


}

void SM3_Final(unsigned char *md, SM3_CTX *ctx)
{

	if(ctx->num == 0)
	{
		memset(ctx->data, 0, 64);
		ctx->data[0] = 0x80000000;
		ctx->data[14] = ctx->Nh;
		ctx->data[15] = ctx->Nl;
	}
	else
	{
		if(ctx->num <= SM3_LAST_BLOCK)
		{
			ctx->data[14] = ctx->Nh;
			ctx->data[15] = ctx->Nl;
		}
		else
		{
			sm3_block(ctx);
			memset(ctx->data, 0, 56);
			ctx->data[14] = ctx->Nh;
			ctx->data[15] = ctx->Nl;
		}
	}

	sm3_block(ctx);
	nl2c(ctx->h[0], md);
	nl2c(ctx->h[1], md);
	nl2c(ctx->h[2], md);
	nl2c(ctx->h[3], md);
	nl2c(ctx->h[4], md);
	nl2c(ctx->h[5], md);
	nl2c(ctx->h[6], md);
	nl2c(ctx->h[7], md);
}

unsigned char *sm3(const unsigned char *d, unsigned int n, unsigned char *md)
{
	SM3_CTX ctx;

	SM3_Init(&ctx);
	SM3_Update(&ctx, d, n);
	SM3_Final(md, &ctx);
	memset(&ctx, 0, sizeof(ctx));
	return(md);
}

makefile文件：

############################################################################
#makefile
############################################################################

#****************************************************************************
# Cross complie path
#****************************************************************************
#GCC_PATH=D:msysgitmingw
#CHAIN_ROOT=/home/yang/imax283/ctools/gcc-4.4.4-glibc-2.11.1-multilib-1.0/arm-fsl-linux-gnueabi/bin

#CROSS_COMPILE=$(CHAIN_ROOT)/arm-none-linux-gnueabi-

#CHAIN_ROOT= /home/yang/b503/ctools/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin
#CROSS_COMPILE=$(CHAIN_ROOT)/arm-linux-gnueabihf-
CROSS_COMPILE = 

CC     := $(CROSS_COMPILE)gcc
CXX    := $(CROSS_COMPILE)g++
AS       := $(CROSS_COMPILE)as
AR     := $(CROSS_COMPILE)ar 
LD     := $(CROSS_COMPILE)ld
RANLIB := $(CROSS_COMPILE)ranlib
OBJDUMP:= $(CROSS_COMPILE)objdump
OBJCOPY:= $(CROSS_COMPILE)objcopy
STRIP  := $(CROSS_COMPILE)strip

#****************************************************************************
# Flags
#****************************************************************************

CFLAGS= 
LDSCRIPT= -L./ -lsm2
LDFLAGS= 


#****************************************************************************
# Source files
#****************************************************************************
SRC_C=$(shell find . -name "*.c")

OBJ_C=$(patsubst %.c, %.o, $(SRC_C))

SRCS := $(SRC_C) $(SRC_C)

OBJS := $(OBJ_C) 


#****************************************************************************
# Targets of the build
#****************************************************************************
TARGET       := test

.PHONY: clean
all:  prebuild  $(TARGET)

#****************************************************************************
# TARGET
#****************************************************************************
prebuild:
    @echo Building exe...

$(TARGET) : $(OBJS)
    @echo Generating exe...
    $(CC) -o  $(TARGET)  $(OBJS) $(LDSCRIPT)
    @echo OK!

%.o : %.c
    $(CC) -c  $(CFLAGS) $< -o  $@
    
clean:
    @echo The following files:
    rm  -f  $(TARGET) *.so
    find . -name "*.[od]" |xargs rm
    @echo Removed!

测试结果：