(meid转pesn.docVIP

最近应产线的要求，需要我们将meid转换成为pesn来使用。 首先，我们来看下meid，这个东西就是以前我们所说的32bit的ESN的扩展版，因为手机越来越多，32bit的ESN已经不能满足需求了，这就出来了一个meid，meid为56bit，我们可以通过sha1算法将meid转换成为pesn.其中pesn也是32bit，成为伪esn。 总共给过来大概有20000万多个meid，需要我们转换成为pesn，其中涉及到了C的memory和file。实现如下： #includeiostream#include memory.husing namespace std; typedef? unsigned char???? byte;???????? /* Unsigned 8? bit value type. */typedef? unsigned short??? word;???????? /* Unsinged 16 bit value type. */typedef? unsigned long???? dword;??????? /* Unsigned 32 bit value type. */typedef? unsigned long??? qword[2]; /* ------------------------------------------------------------ *//* Constants and definitions for SHA-1????????????????????????? *//* ------------------------------------------------------------ */typedef union{? unsigned long l[16];? unsigned char c[64];} CHAR64LONG16; /* Optimizations */unsigned long rol30( unsigned long value){? return (value 30) | ((value 2) 0x3fffffff);} unsigned long rol24( unsigned long value){? return (value 24) | ((value 8) 0x00ffffff);} unsigned long rol8( unsigned long value){? return (value 8) | ((value 24) 0x000000ff);} unsigned long rol5( unsigned long value){? return (value 5) | ((value 27) 0x0000001f);} unsigned long rol1( unsigned long value){? return (value 1) | ((value 31) 0;} /* blk0() and blk() perform the initial expand */ //#if defined(__BIG_ENDIAN)//#define blk0(block, i)????? (block-l[i])//#else#define blk0(block, i)????? (block-l[i]??????? = (rol24(block-l[i]) 0xff00ff00UL) | (rol8(block-l[i]) 0x00ff00ffUL))//#endif#define blk(block, i)?????? (block-l[i 0x0f] = rol1(block-l[(i + 13) 0x0f] ^ block-l[(i +? 8) 0x0f] ^ block-l[(i +? 2) 0x0f] ^ block-l[(i +? 0) 0x0f])) /* R0, R1, R2, R3, R4 are the different operations used in SHA1 */ #define R0(block, work, v, w, x, y, z, i) \??? (work[z] += ((work[w](work[x]^work[y]))^work[y])?????????? + blk0(block, i) + 0x5a827999UL + rol5(work[v]), work[w] = rol30(work[w])) #define R1(block,