今天终于搞定更改过密钥的php-screw解密问题,乐呵一下!
改进下
这样就可以解密任何加密过的PHP源码(包括更改过密钥的),解密的原理稍后具体列出,先说下如何加密
列出之前写使用php screw加密PHP的自动加密代码
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#include <stdio.h>#include <stdlib.h>#include <stdarg.h>#include <sys/types.h>#include <sys/stat.h>#include <unistd.h>#include "php_screw.h"#include "my_screw.h"main(int argc, char**argv){ FILE *fp; struct stat stat_buf; char *datap, *newdatap; int datalen, newdatalen; int cryptkey_len = sizeof pm9screw_mycryptkey / 2; char newfilename[256]; int i; if (argc != 2) { fprintf(stderr, "Usage: filename. "); exit(0); } fp = fopen(argv[1], "r"); if (fp == NULL) { fprintf(stderr, "File not found(%s) ", argv[1]); exit(0); } fstat(fileno(fp), &stat_buf); datalen = stat_buf.st_size; datap = (char*)malloc(datalen + PM9SCREW_LEN); fread(datap, datalen, 1, fp); fclose(fp); if (memcmp(datap, PM9SCREW, PM9SCREW_LEN) == 0) { fprintf(stderr, "Already Crypted(%s) ", argv[1]); exit(0); } sprintf(newfilename, "%s.screw", argv[1]); fp = fopen(newfilename, "w"); if (fp == NULL) { fprintf(stderr, "Can not create file(%s) ", newfilename); exit(0); } newdatap = zencode(datap, datalen, &newdatalen); for(i=0; i<newdatalen; i++) { newdatap[i] = (char)pm9screw_mycryptkey[(newdatalen - i) % cryptkey_len] ^ (~(newdatap[i])); } fwrite(PM9SCREW, PM9SCREW_LEN, 1, fp); fwrite(newdatap, newdatalen, 1, fp); fclose(fp); fprintf(stderr, "Success Crypting(%s) ", argv[1]); free(newdatap); free(datap);} |
原文：http://www.cnblogs.com/wangluochong/p/4890850.html