apply encryption and hash algorithm of RSA, DES and MD5 etc.

c语言编写可对文件加密-c language of the document can be encrypted

rsa加密算法，VC环境，基于对画框的演示rsa算法的程序。-rsa encryption algorithm, VC environment, based on a demonstration of frame rsa algorithm procedure.

This software calculates the crc32 polynomial of a string. There is one class cCrc32.

MD5 算法描述 对 MD5 算法简要的叙述可以为：MD5 以 512 位分组来处理输入的信 息，且每一分组又被划分为 16 个 32 位子分组，经过了一系列的处理后， 算法的输出由四个 32 位分组组成， 将这四个 32 位分组级联后将生成一个 128 位散列值。 在 MD5 算法中，首先需要对信息进行填充，使其字节长度对 512 求 余的结果等于 448。因此，信息的字节长度（Bits Length）将被扩展至 N*512+448，即 N*64+56 个字节（Bytes） ，N 为一个正整数。填充的方 法如下，在信息的后面填充一个 1 和无数个 0，直到满足上面的条件时才 停止用 0 对信息的填充。 请点击左侧文件开始预览 ！预览只提供20%的代码片段，完整代码需下载后查看 加载中 侵权举报

应用背景基于java的自定义文件加压解压，拥有比普通压缩包密码更方便更保险的加密程度关键技术通过更改了文件数据写入顺序起到加密效果，如果不用相应的解压程序解压的话会使得文件无法读取

This program is free software you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.-This program is free software you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

ASP写的MD5加密算法。-ASP write MD5 encryption algorithm.

MD5加密单元及DEMO-MD5 encryption modules and DEMO

Base64 加密算法（Author 蒋柏良 Jerry Jiang)-* * DESCRIPTION * Base64 processes input in 24bit chunks by converting each chunk into 4 * bytes of output. It does so by splitting input into four 6bit groups and * using these as indexes in the following substitution table- * const char base64_map[] = * "ABCDEFGHIJKLMNOPQRSTUVWXYZ" * "abcdefghijklmnopqrstuvwxyz" * "0123456789+/" * If an input is not a multiple of 3 bytes, it s padded with zeros. In * this case the output bytes that consist entirely of the pad data are * replaced with = . * * Example * An input of 0x00 0x45 0xF2 is equivalent to 00000000 01000101 11110010 * bit sequence, which s then split into 000000 000100 010111 110010 * and these are substituted to produce the following base64 encoding * A E X y * * RETURN VALUE * b64_length() should return output length for the input of len bytes. * b64_encode() should encode len bytes from src int

(C++)语言下文件输入输出函数的一些局限性 数据加密算法原理、实现-(C) language input and output file under some limitations function of data encryption algorithm theory, realization