解密算法一

一、ICCID 解密算法

//函数: static u8 HuaweiGenPICPSW(ascii *sSrc, u8 nSrcLen, ascii *sDec, u8 nDecLen)
//变量说明:
//函数返回值：-1，失败；TRUE，成功。
// ascii *sSrc: 源数据，待解密的ICCID码内容
// u8 nSrcLen: 源数据长度，待解密的ICCID码长度
// ascii *sDec: 目标数据，生成的解密码内容
// u8 nDecLen:目标数据长度，生成的解密码长度

//常量:
//HUAWEI_SPE_ICCID_LEN： ICCID码长度为15位
// HUAWEI_SPE_PIC_PSW_LEN： 解密码长度为14位


#define HUAWEI_SPE_ICCID_LEN 15
#define HUAWEI_SPE_PIC_PSW_LEN 14

static u8 HuaweiGenPICPSW(ascii *sSrc, u8 nSrcLen, ascii *sDec, u8 nDecLen)
{
u8 i = 0;
u8 l = 0;
u8 tmp = 0;
u8 vPSW[HUAWEI_SPE_PIC_PSW_LEN+1] = {0};
u32 data1 = 0, data2 = 0, decData1 = 0, decData2;
static u8 seed[] = ""; //密钥字符串，正式生成系统时，通过电话知会。
if ((!sSrc) || (!sDec)||
(HUAWEI_SPE_ICCID_LEN > nSrcLen) || ((HUAWEI_SPE_PIC_PSW_LEN+1) > nDecLen))
{
return -1;
}
i = 1;/*前1 位跳过*/
while(i<HUAWEI_SPE_ICCID_LEN)
{
vPSW[l] = sSrc[i]^seed[l];
if ((sSrc[i] > '9') || (sSrc[i] < '0'))
{
/*把非数字字符转换成数字*/
vPSW[l] = sSrc[i]&0x07;
}
else
{
/*与seed进行异或*/
vPSW[l] = sSrc[i]^seed[l];
}
/*转换成数值前,保证最高位非0*/
if (vPSW[0] == '0')
{
vPSW[0] = '2';
}
if (vPSW[(HUAWEI_SPE_PIC_PSW_LEN/2)] == '0')
{
vPSW[(HUAWEI_SPE_PIC_PSW_LEN/2)] = '6';
}
i++;l++;
}
Cal4_509output_uart2("vPSW = %s\n", vPSW);
i = 0;
/*把14位字符串转换成两个数值*/
while(i<(HUAWEI_SPE_PIC_PSW_LEN/2))
{
data2 = data2*10+(vPSW[i] - '0');
data1 = data1*10+(vPSW[i+(HUAWEI_SPE_PIC_PSW_LEN/2)] - '0');
i++;
}
/*对数值进行与，异或*/
decData1 = data1&data2;
decData2 = data1^data2;
Cal4_509output_uart2("data1 = %d, data2 = %d\n", data1, data2);
Cal4_509output_uart2("decData1 = %d, decData2 = %d\n", decData1, decData2);
i= 0;
/*再把数值转换成字符串*/
while(i<(HUAWEI_SPE_PIC_PSW_LEN/2))
{
tmp = (u8)(decData1%10);
sDec[i] = tmp + '0';
decData1 = decData1/10;

tmp = (u8)(decData2%10);
sDec[i+(HUAWEI_SPE_PIC_PSW_LEN/2)] = tmp + '0';
decData2 = decData2/10;

i++;
}

sDec[HUAWEI_SPE_PIC_PSW_LEN] = '\0';
Cal4_509output_uart2("----sDec = %s\n", sDec);
return TRUE;
}