工作笔记

通过go语言进行加密，可利用php openssl扩展进行解密。

package encrypt

import (
	"bytes"
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"fmt"
)

type ecb struct {
	b         cipher.Block
	blockSize int
}

func newECB(b cipher.Block) *ecb {
	return &ecb{
		b:         b,
		blockSize: b.BlockSize(),
	}
}

type ecbEncrypter ecb

// NewECBEncrypter returns a BlockMode which encrypts in electronic code book
// mode, using the given Block.
func NewECBEncrypter(b cipher.Block) cipher.BlockMode {
	return (*ecbEncrypter)(newECB(b))
}

func (x *ecbEncrypter) BlockSize() int { return x.blockSize }

func (x *ecbEncrypter) CryptBlocks(dst, src []byte) {
	if len(src)%x.blockSize != 0 {
		panic("crypto/cipher: input not full blocks")
	}
	if len(dst) < len(src) {
		panic("crypto/cipher: output smaller than input")
	}
	for len(src) > 0 {
		x.b.Encrypt(dst, src[:x.blockSize])
		src = src[x.blockSize:]
		dst = dst[x.blockSize:]
	}
}

type ecbDecrypter ecb

// NewECBDecrypter returns a BlockMode which decrypts in electronic code book
// mode, using the given Block.
func NewECBDecrypter(b cipher.Block) cipher.BlockMode {
	return (*ecbDecrypter)(newECB(b))
}

func (x *ecbDecrypter) BlockSize() int { return x.blockSize }

func (x *ecbDecrypter) CryptBlocks(dst, src []byte) {
	if len(src)%x.blockSize != 0 {
		panic("crypto/cipher: input not full blocks")
	}
	if len(dst) < len(src) {
		panic("crypto/cipher: output smaller than input")
	}
	for len(src) > 0 {
		x.b.Decrypt(dst, src[:x.blockSize])
		src = src[x.blockSize:]
		dst = dst[x.blockSize:]
	}
}

func encodeBase64(b []byte) string {
	return base64.StdEncoding.EncodeToString(b)
}

func decodeBase64(s string) []byte {
	data, err := base64.StdEncoding.DecodeString(s)
	if err != nil {
		panic(err)
	}
	return data
}

func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padtext...)
}
func PKCS5UnPadding(origData []byte) []byte {
	length := len(origData)
	// 去掉最后一个字节 unpadding 次
	unpadding := int(origData[length-1])
	return origData[:(length - unpadding)]
}
func EncryptECB(src string, hexKey string) string {
	var hasError = false
	block, err := aes.NewCipher([]byte(hexKey))
	if err != nil {
		fmt.Println("key error")
		hasError = true
	}

	if src == "" {
		fmt.Println("plain content empty")
		hasError = true
	}

	if hasError {
		return ""
	}
	ecbn := NewECBEncrypter(block)
	content := []byte(src)
	content = PKCS5Padding(content, block.BlockSize())
	crypted := make([]byte, len(content))
	ecbn.CryptBlocks(crypted, content)
	return base64.StdEncoding.EncodeToString(crypted)
}
func DecryptECB(src string, hexKey string) string {
	var hasError = false
	block, err := aes.NewCipher([]byte(hexKey))
	if err != nil {
		fmt.Println("key error")
		hasError = true
	}

	if src == "" {
		fmt.Println("plain content empty")
		hasError = true
	}

	if hasError {
		return ""
	}
	ecbn := NewECBDecrypter(block)
	content := decodeBase64(src)
	//fmt.Println(content)
	//content = PKCS5Padding(content, block.BlockSize())
	crypted := make([]byte, len(content))
	ecbn.CryptBlocks(crypted, content)
	return string(PKCS5UnPadding(crypted))
}

package main
import "fmt"
import "sync"
import "runtime"

var counter int = 0
func Count(lock *sync.Mutex) { lock.Lock()
        counter++
        fmt.Println(z)
        lock.Unlock()
}
func main() {
lock := &sync.Mutex{}
   for i := 0; i < 10; i++ { go Count(lock)
}
for { lock.Lock()
c := counter
    lock.Unlock()
runtime.Gosched()
 if c >= 10 {
  } }
}

在上面的例子中,我们在10个goroutine中共享了变量counter。每个goroutine执行完成后, 将counter的值加1。因为10个goroutine是并发执行的,所以我们还引入了锁,也就是代码中的 lock变量。每次对n的操作,都要先将锁锁住,操作完成后,再将锁打开。在主函数中,使用for 循环来不断检查counter的值(同样需要加锁)。当其值达到10时,说明所有goroutine都执行完 毕了,这时主函数返回,程序退出。
继续阅读Go并发编程