159 lines
5.4 KiB
C++
159 lines
5.4 KiB
C++
#include "Kernel\Sys.h"
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#include "Security\Crc.h"
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static const uint DataBuffer[] =
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{
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0x00001021, 0x20423063, 0x408450a5, 0x60c670e7, 0x9129a14a, 0xb16bc18c,
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0xd1ade1ce, 0xf1ef1231, 0x32732252, 0x52b54294, 0x72f762d6, 0x93398318,
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0xa35ad3bd, 0xc39cf3ff, 0xe3de2462, 0x34430420, 0x64e674c7, 0x44a45485,
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0xa56ab54b, 0x85289509, 0xf5cfc5ac, 0xd58d3653, 0x26721611, 0x063076d7,
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0x569546b4, 0xb75ba77a, 0x97198738, 0xf7dfe7fe, 0xc7bc48c4, 0x58e56886,
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0x78a70840, 0x18612802, 0xc9ccd9ed, 0xe98ef9af, 0x89489969, 0xa90ab92b,
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0x4ad47ab7, 0x6a961a71, 0x0a503a33, 0x2a12dbfd, 0xfbbfeb9e, 0x9b798b58,
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0xbb3bab1a, 0x6ca67c87, 0x5cc52c22, 0x3c030c60, 0x1c41edae, 0xfd8fcdec,
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0xad2abd0b, 0x8d689d49, 0x7e976eb6, 0x5ed54ef4, 0x2e321e51, 0x0e70ff9f,
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0xefbedfdd, 0xcffcbf1b, 0x9f598f78, 0x918881a9, 0xb1caa1eb, 0xd10cc12d,
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0xe16f1080, 0x00a130c2, 0x20e35004, 0x40257046, 0x83b99398, 0xa3fbb3da,
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0xc33dd31c, 0xe37ff35e, 0x129022f3, 0x32d24235, 0x52146277, 0x7256b5ea,
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0x95a88589, 0xf56ee54f, 0xd52cc50d, 0x34e224c3, 0x04817466, 0x64475424,
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0x4405a7db, 0xb7fa8799, 0xe75ff77e, 0xc71dd73c, 0x26d336f2, 0x069116b0,
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0x76764615, 0x5634d94c, 0xc96df90e, 0xe92f99c8, 0xb98aa9ab, 0x58444865,
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0x78066827, 0x18c008e1, 0x28a3cb7d, 0xdb5ceb3f, 0xfb1e8bf9, 0x9bd8abbb,
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0x4a755a54, 0x6a377a16, 0x0af11ad0, 0x2ab33a92, 0xed0fdd6c, 0xcd4dbdaa,
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0xad8b9de8, 0x8dc97c26, 0x5c644c45, 0x3ca22c83, 0x1ce00cc1, 0xef1fff3e,
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0xdf7caf9b, 0xbfba8fd9, 0x9ff86e17, 0x7e364e55, 0x2e933eb2, 0x0ed11ef0
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};
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/*bool inited = false;
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void Init()
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{
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#ifdef STM32F4
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_CRC, ENABLE);
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#else
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RCC->AHBENR |= RCC_AHBPeriph_CRC;
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#endif
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inited = true;
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}
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// 硬件实现的Crc
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uint HardCrc(const Buffer& bs, uint crc)
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{
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if (!inited) Init();
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CRC_ResetDR();
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// STM32的初值是0xFFFFFFFF，而软Crc初值是0
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CRC->DR = _REV(crc ^ 0xFFFFFFFF);
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//CRC->DR = 0xFFFFFFFF;
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uint* ptr = (uint*)bs.GetBuffer();
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uint len = bs.Length();
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len >>= 2;
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while(len-- > 0)
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{
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CRC->DR =_REV(*ptr++); // 字节顺序倒过来,注意不是位序,不是用__RBIT指令
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}
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return CRC->DR;
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}*/
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void TestCrc()
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{
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debug_printf("\r\n\r\n");
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debug_printf("TestCrc Start......\r\n");
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debug_printf("\r\n");
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uint size = ArrayLength(DataBuffer);
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// Sys.Crc是软校验，HardCrc是硬件实现，要求硬件实现的结果跟软件实现一致
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uint data = 0x12345678;
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ByteArray bs(&data, 4);
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uint crc = Crc::Hash(bs, 0);
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uint crc2 = Crc::Hash(bs, 4);
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bs.Show();
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debug_printf("\r\n\tSoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 无初值时，两者一样
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uint temp = crc;
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// 试试二次计算Crc
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crc = Crc::Hash(Buffer(&crc, 4), 0);
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crc2 = Crc::Hash(Buffer(&crc2, 4));
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ByteArray(&temp, 4).Show();
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debug_printf("\r\n\t");
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 结果相同，但都不是0
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// 连续测试。构建8字节，前面是data，后面是前面的crc
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UInt64 data2 = temp;
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data2 <<= 32;
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data2 += data;
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ByteArray bs2(&data2, 8);
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crc = Crc::Hash(bs2, 0);
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crc2 = Crc::Hash(bs2);
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bs2.Show();
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debug_printf("\r\n\t");
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 结果相同，但都不是0
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// 实际应用中，先计算数据的校验，然后接着附加校验码部分，跟直接连续计算效果应该一致
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// 实际上就是数字为初值，对它自身进行校验码计算
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ByteArray bs3(&temp, 4);
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crc = Crc::Hash(bs3, data);
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//crc2 = HardCrc(bs3, data);
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bs3.Show();
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debug_printf(" <= %p\r\n\t", data);
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 结果不同，HardCrc结果跟8字节测试相同
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ByteArray bs4(&temp, 4);
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crc = Crc::Hash(bs4, temp);
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//crc2 = HardCrc(bs4, temp);
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bs4.Show();
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debug_printf(" <= %p\r\n\t", temp);
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 结果不同，SoftCrc结果跟8字节测试相同
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// 对大数据块进行校验
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debug_printf("\r\n");
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ByteArray bs5(DataBuffer, size*4);
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crc = Crc::Hash(bs5, 0);
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crc2 = Crc::Hash(bs5);
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bs5.Show();
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debug_printf("\r\n\t");
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 无初值时，两者一样
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temp = crc;
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// 实际应用中，先计算数据的校验，然后接着附加校验码部分
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ByteArray bs6(&temp, 4);
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crc = Crc::Hash(bs6, temp);
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//crc2 = HardCrc(bs6, temp);
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bs6.Show();
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debug_printf(" <= %p\r\n\t", temp);
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 有初值时，两者不一样
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// 增量计算CRC
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ByteArray bs7(DataBuffer, size*4);
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crc = Crc::Hash(bs7, 0);
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temp = crc;
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crc = Crc::Hash(Buffer(&crc, 4), crc);
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//crc2 = HardCrc(bs7, 0);
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//crc2 = HardCrc(Buffer(&crc2, 4), crc2);
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bs7.Show();
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debug_printf(" <= %p\r\n\t", temp);
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debug_printf("SoftCrc:%p HardCrc:%p \r\n", crc, crc2);
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// 测试Crc16，数据和crc部分一起计算crc16，结果为0
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debug_printf("\r\n");
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byte data16[] = { 0x01, 0x08, 0x00, 0x00};
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ushort crc16 = Crc::Hash16(Buffer(data16, 4));
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debug_printf("Crc::Hash16(#%08x) = 0x%04x\r\n", _REV(*(uint*)data16), crc16);
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ushort crc17 = Crc::Hash16(Buffer(&crc16, 2), crc16);
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debug_printf("Crc::Hash16(#%08x, 0x%04x) = 0x%04x\r\n", _REV(*(uint*)data16), crc16, crc17);
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debug_printf("\r\n");
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debug_printf("TestCrc Finish!\r\n");
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}
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