Use C # To implement MD5 and sha1 hash algorithms

// Write to yourself or friends who have the same needs

/*
* Hash functions:
* The hash function maps a binary string of any length to a small binary string of a fixed length.
* The encryption hash function has the following attribute: it is unlikely that two hash columns with the same value are found in calculation.
* Different inputs. That is, the hash values of the two groups of data match only when the corresponding data matches.
* A small amount of data changes will generate unpredictable and massive changes in the hash value.
*
* The Hash Value of the MD5 algorithm is 128 bits.
* The sha1 algorithm's hash value is 160 bits.
*/

Using system;
Using system. Collections. Generic;
Using system. text;
Using system. Security. cryptography;

Namespace md5_app
{
Class Program
{
Static void main (string [] ARGs)
{
String strsrc = "how are you? ";
Console. writeline ("Original:" + strsrc );
Console. writeline ();

Console. writeline ("MD5 Hash Value:" + md5_hash (strsrc ));
Console. writeline ();

Console. writeline ("sha1 hash value:" + sha1_hash (strsrc ));
Console. writeline ();
}

// MD5
Static Public String md5_hash (string str_md5_in)
{
MD5 MD5 = new md5cryptoserviceprovider ();
Byte [] bytes_md5_in = utf8encoding. Default. getbytes (str_md5_in );
Byte [] bytes_md5_out = md5.computehash (bytes_md5_in );
String str_md5_out = bitconverter. tostring (bytes_md5_out );
Return str_md5_out;
}

// Sha1
Static Public String sha1_hash (string str_sha1_in)
{
Sha1 sha1 = new sha1cryptoserviceprovider ();
Byte [] bytes_sha1_in = utf8encoding. Default. getbytes (str_sha1_in );
Byte [] bytes_sha1_out = sha1.computehash (bytes_sha1_in );
String str_sha1_out = bitconverter. tostring (bytes_sha1_out );
Return str_sha1_out;
}
}
}