常用加密

密码加密

package main

import (
    "errors"
    "fmt"
    "github.com/prometheus/common/log"
    "golang.org/x/crypto/bcrypt"
)

//GeneratePassword 加密明文密码
func GeneratePassword(pwd string) (string, error) {
    encryptedPwd, err := bcrypt.GenerateFromPassword([]byte(pwd), bcrypt.DefaultCost)
    return string(encryptedPwd), err
}

//ValidatePassword 验证密码
// pwd 明文密码
// encryptedPwd 加密的密码
func ValidatePassword(pwd string, encryptedPwd string) (bool, error) {
    if err := bcrypt.CompareHashAndPassword([]byte(encryptedPwd), []byte(pwd)); err != nil {
        return false, errors.New("wrong password")
    }
    return true, nil
}

func main() {
    p := "123456"
    pwd, err := GeneratePassword(p)
    if err != nil {
        log.Error(err)
    }
    fmt.Println("ciphertext:", pwd)

    isOk, _ := ValidatePassword(p, pwd)
    if !isOk {
        log.Error(err)
    }
    fmt.Println(isOk)
}

打印结果

ciphertext: $2a$10$mGB.ml/M/2A..NgIrFSk1ekl0Qi3gIvfk3n0sOFTje9ScZtxxpLfG
true

MD5

package main

import (
    "crypto/md5"
    "fmt"
    "io"
)

func Md5(str string) string {
    h := md5.New()
    _, _ = io.WriteString(h, str)
    return fmt.Sprintf("%x", h.Sum(nil))
}

func main() {
    fmt.Println(Md5("123456"))
}

打印结果

e10adc3949ba59abbe56e057f20f883e

SHA

package main

import (
    "crypto/sha1"
    "crypto/sha256"
    "fmt"
    "io"
)

func SHA1(str string) string {
    h := sha1.New()
    _, _ = io.WriteString(h, str)
    return fmt.Sprintf("%x", h.Sum(nil))
}

func SHA2(str string) string {
    h := sha256.New()
    _, _ = io.WriteString(h, str)
    return fmt.Sprintf("%x", h.Sum(nil))
}

func main() {
    msg := "https://golang.org"
    fmt.Println(SHA1(msg))
    fmt.Println(SHA2(msg))
}

打印结果

0a95b510a2e68b88ebc9bc09e76f7dbcfa1eb90e
bfd04cc20536303bd2c62bad327217f5c94f96578a5e95ca495f1d46c113016b

BASE64

package main

import (
    "encoding/base64"
    "fmt"
)

func Base64Encode(str string) string {
    encoded := base64.StdEncoding.EncodeToString([]byte(str))
    return encoded
}

func Base64Decode(str string) (string, error) {
    decoded, err := base64.StdEncoding.DecodeString(str)
    if err != nil {
        return "", err
    }
    return string(decoded), nil
}

func main() {
    msg := "https://golang.org"
    fmt.Println(Base64Encode(msg))
    fmt.Println(Base64Decode("aHR0cHM6Ly9nb2xhbmcub3Jn"))
}

AES加解密

package main

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

//高级加密标准(Adevanced Encryption Standard ,AES)

//16,24,32位字符串的话,分别对应AES-128,AES-192,AES-256 加密方法
//key不能泄露
var PwdKey = []byte("DIS**#KKKDJJSKDI")

//PKCS7 填充模式
func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
    padding := blockSize - len(ciphertext)%blockSize
    //Repeat()函数的功能是把切片[]byte{byte(padding)}复制padding个,然后合并成新的字节切片返回
    padtext := bytes.Repeat([]byte{byte(padding)}, padding)
    return append(ciphertext, padtext...)
}

//填充的反向操作,删除填充字符串
func PKCS7UnPadding(origData []byte) ([]byte, error) {
    //获取数据长度
    length := len(origData)
    if length == 0 {
        return nil, errors.New("加密字符串错误!")
    } else {
        //获取填充字符串长度
        unpadding := int(origData[length-1])
        //截取切片,删除填充字节,并且返回明文
        return origData[:(length - unpadding)], nil
    }
}

//实现加密
func AesEcrypt(origData []byte, key []byte) ([]byte, error) {
    //创建加密算法实例
    block, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }
    //获取块的大小
    blockSize := block.BlockSize()
    //对数据进行填充,让数据长度满足需求
    origData = PKCS7Padding(origData, blockSize)
    //采用AES加密方法中CBC加密模式
    blocMode := cipher.NewCBCEncrypter(block, key[:blockSize])
    crypted := make([]byte, len(origData))
    //执行加密
    blocMode.CryptBlocks(crypted, origData)
    return crypted, nil
}

//实现解密
func AesDeCrypt(cypted []byte, key []byte) ([]byte, error) {
    //创建加密算法实例
    block, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }
    //获取块大小
    blockSize := block.BlockSize()
    //创建加密客户端实例
    blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
    origData := make([]byte, len(cypted))
    //这个函数也可以用来解密
    blockMode.CryptBlocks(origData, cypted)
    //去除填充字符串
    origData, err = PKCS7UnPadding(origData)
    if err != nil {
        return nil, err
    }
    return origData, err
}

//加密base64
func EnPwdCode(pwd []byte) (string, error) {
    result, err := AesEcrypt(pwd, PwdKey)
    if err != nil {
        return "", err
    }
    return base64.StdEncoding.EncodeToString(result), err
}

//解密
func DePwdCode(pwd string) ([]byte, error) {
    //解密base64字符串
    pwdByte, err := base64.StdEncoding.DecodeString(pwd)
    if err != nil {
        return nil, err
    }
    //执行AES解密
    return AesDeCrypt(pwdByte, PwdKey)

}
func main() {
    str := []byte("12fff我是ww.topgoer.com的站长枯藤")
    pwd, _ := EnPwdCode(str)
    bytes, _ := DePwdCode(pwd)
    fmt.Println(string(bytes))
}

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