Demo:用有微软的cryptoAPI ＣＳＰ加密ＡＰＩ函数，对文件（Ｆile）进行Encrypt和Decrypt.产生数字签名．对使用CryptEncrypt（）等函数是一个很好的例子，程序测试通过．-Demo : Microsoft's cryptoAPI CSP Cryptographic API function, the document (File) Encrypt and Decrypt. Creating a digital signature. The use Cryp

API获取文件哈希值（sha1、sha256、sha384、sha512）及MD5等-API to get the file hash value and MD5 etc.

利用CryptoAPI实现的加密解密程序，过程很中规中矩，可以参考改写。-Encryption and decryption using CryptoAPI implementation process, the process is quite satisfactory, can refer to the rewrite.