<<Network programming with Go>> Security

Security_Blowfish.go

package main

import (
	"github.com/crypto/blowfish"
	"fmt"
	"bytes"
)

func main_Blowfish() {
	key := []byte("my key")
	cipher, err := blowfish.NewCipher(key)
	if hasErr(err) {
		fmt.Println(err.Error())
	}
	src := []byte("hello\n\n\n")
	var enc [512]byte

	cipher.Encrypt(enc[0:], src)

	var descrypt [8]byte
	cipher.Decrypt(descrypt[0:], enc[0:])
	result := bytes.NewBuffer(nil)
	result.Write(descrypt[0:8])
	fmt.Println(string(result.Bytes()))

}

func hasErr(err error) bool {
	return err != nil
}

Security_MD5Hash.go

package main

import (
	"crypto/md5"
	"fmt"
)

func main_MD5Hash() {
	hash := md5.New()
	bytes := []byte("hello\n")
	hash.Write(bytes)
	hashValue := hash.Sum(nil)
	hashSize := hash.Size()
	for n := 0; n < hashSize; n += 4 {
		var val uint32
		val = uint32(hashValue[n]) << 24 +
			uint32(hashValue[n+1]) << 16 +
			uint32(hashValue[n+2]) << 8 +
			uint32(hashValue[n+3])
		fmt.Printf("%x ", val)
	}
	fmt.Println()
}

Security_Security.iml

<?xml version="1.0" encoding="UTF-8"?>
<module type="GO_MODULE" version="4">
  <component name="NewModuleRootManager" inherit-compiler-output="true">
    <exclude-output />
    <content url="file://$MODULE_DIR$" />
    <orderEntry type="inheritedJdk" />
    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="GOPATH &lt;Security&gt;" level="project" />
  </component>
</module>