/**
 * 验证GM/T 0003.5--2012 附录A 数字签名与验证示例
 * GmSSL： https://github.com/guanzhi/GmSSL
 * git版本：95c0dba
 */
void testSM2Prestreat() {

	BIGNUM *a, *b, *xG, *yG, *xA, *yA, *zA;
	a = BN_new();
	b = BN_new();
	xG = BN_new();
	yG = BN_new();
	xA = BN_new();
	yA = BN_new();
	zA = BN_new();

	BN_hex2bn(&a,
			"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC");
	BN_hex2bn(&b,
			"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93");
	BN_hex2bn(&xG,
			"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7");
	BN_hex2bn(&yG,
			"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0");
	BN_hex2bn(&xA,
			"09F9DF311E5421A150DD7D161E4BC5C672179FAD1833FC076BB08FF356F35020 ");
	BN_hex2bn(&yA,
			"CCEA490CE26775A52DC6EA718CC1AA600AED05FBF35E084A6632F6072DA9AD13");

	unsigned char ENTL[2];
	unsigned char id[] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x31,
			0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38 };
	int idLen = sizeof(id) * 8;
	unsigned char aBin[32] = { 0 };
	unsigned char bBin[32] = { 0 };
	unsigned char xGBin[32] = { 0 };
	unsigned char yGBin[32] = { 0 };
	unsigned char xABin[32] = { 0 };
	unsigned char yABin[32] = { 0 };

	//内存中数据存储均采用大端存储
	BN_bn2bin(a, aBin);
	BN_bn2bin(b, bBin);
	BN_bn2bin(xG, xGBin);
	BN_bn2bin(yG, yGBin);
	BN_bn2bin(xA, xABin);
	BN_bn2bin(yA, yABin);
	ENTL[0] = 0;
	ENTL[1] = idLen;

	FILE *fp = fopen("/tmp/sm2Prestrest1.bin", "wb");
	fwrite(ENTL, 2, 1, fp);
	fwrite(id, sizeof(id), 1, fp);
	fwrite(aBin, sizeof(aBin), 1, fp);
	fwrite(bBin, sizeof(bBin), 1, fp);
	fwrite(xGBin, sizeof(xGBin), 1, fp);
	fwrite(yGBin, sizeof(yGBin), 1, fp);
	fwrite(xABin, sizeof(xABin), 1, fp);
	fwrite(yABin, sizeof(yABin), 1, fp);
	fclose(fp);
	/*
	 [yeqiang@localhost exampleProgram]$ hexdump -C /tmp/sm2Prestrest1.bin
	 00000000  00 80 31 32 33 34 35 36  37 38 31 32 33 34 35 36  |..12345678123456|
	 00000010  37 38 ff ff ff fe ff ff  ff ff ff ff ff ff ff ff  |78..............|
	 00000020  ff ff ff ff ff ff 00 00  00 00 ff ff ff ff ff ff  |................|
	 00000030  ff fc 28 e9 fa 9e 9d 9f  5e 34 4d 5a 9e 4b cf 65  |..(.....^4MZ.K.e|
	 00000040  09 a7 f3 97 89 f5 15 ab  8f 92 dd bc bd 41 4d 94  |.............AM.|
	 00000050  0e 93 32 c4 ae 2c 1f 19  81 19 5f 99 04 46 6a 39  |..2..,...._..Fj9|
	 00000060  c9 94 8f e3 0b bf f2 66  0b e1 71 5a 45 89 33 4c  |.......f..qZE.3L|
	 00000070  74 c7 bc 37 36 a2 f4 f6  77 9c 59 bd ce e3 6b 69  |t..76...w.Y...ki|
	 00000080  21 53 d0 a9 87 7c c6 2a  47 40 02 df 32 e5 21 39  |!S...|.*G@..2.!9|
	 00000090  f0 a0 09 f9 df 31 1e 54  21 a1 50 dd 7d 16 1e 4b  |.....1.T!.P.}..K|
	 000000a0  c5 c6 72 17 9f ad 18 33  fc 07 6b b0 8f f3 56 f3  |..r....3..k...V.|
	 000000b0  50 20 cc ea 49 0c e2 67  75 a5 2d c6 ea 71 8c c1  |P ..I..gu.-..q..|
	 000000c0  aa 60 0a ed 05 fb f3 5e  08 4a 66 32 f6 07 2d a9  |.`.....^.Jf2..-.|
	 000000d0  ad 13                                             |..|
	 000000d2
	 [yeqiang@localhost exampleProgram]$ /usr/local/gmssl/bin/gmssl dgst -sm3 -hex /tmp/sm2Prestrest1.bin
	 SM3(/tmp/sm2Prestrest1.bin)= b2e14c5c79c6df5b85f4fe7ed8db7a262b9da7e07ccb0ea9f4747b8ccda8a4f3
	 */

	//计算预处理2
	unsigned char m[] = { 0x6D, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x20, 0x64,
			0x69, 0x67, 0x65, 0x73, 0x74 };
	BN_hex2bn(&zA,
			"b2e14c5c79c6df5b85f4fe7ed8db7a262b9da7e07ccb0ea9f4747b8ccda8a4f3");
	unsigned char zAm[32 + sizeof(m)];
	BN_bn2bin(zA, zAm);
	memcpy(zAm + 32, m, sizeof(m));
	fp = fopen("/tmp/zAm.bin", "wb");
	fwrite(zAm, sizeof(zAm), 1, fp);
	fclose(fp);

	/**
	 [yeqiang@localhost exampleProgram]$ hexdump -C /tmp/zAm.bin
	 00000000  b2 e1 4c 5c 79 c6 df 5b  85 f4 fe 7e d8 db 7a 26  |..L\y..[...~..z&|
	 00000010  2b 9d a7 e0 7c cb 0e a9  f4 74 7b 8c cd a8 a4 f3  |+...|....t{.....|
	 00000020  6d 65 73 73 61 67 65 20  64 69 67 65 73 74        |message digest|
	 0000002e
	 [yeqiang@localhost exampleProgram]$ /usr/local/gmssl/bin/gmssl dgst -sm3 -hex /tmp/zAm.bin
	 SM3(/tmp/zAm.bin)= f0b43e94ba45accaace692ed534382eb17e6ab5a19ce7b31f4486fdfc0d28640
	 */
}

注意大整数在内存中采用大端存储方式

GM/T 0003.5 部分原文：

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