aes-ecb.go

package main

import (
	"crypto/aes"
	"encoding/hex"
	_ "github.com/jinzhu/gorm/dialects/mysql"
	"log"
	"time"
)

func main()  {
	// 加密的密钥
	key := []byte("key")

	// 加密
	origData := []byte("张三")
	encrypted := AesEncryptECB(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))

	// 解密
	encrypted, _ = hex.DecodeString("0b5aee2ebd31bb57da7af8a47f1c0f06")
	decrypted := AesDecryptECB(encrypted, key)
	log.Println("解密结果：", string(decrypted))
}

func AesEncryptECB(origData []byte, key []byte) (encrypted []byte) {
	cipher, _ := aes.NewCipher(generateKey(key))
	length := (len(origData) + aes.BlockSize) / aes.BlockSize
	plain := make([]byte, length*aes.BlockSize)
	copy(plain, origData)
	pad := byte(len(plain) - len(origData))
	for i := len(origData); i < len(plain); i++ {
		plain[i] = pad
	}
	encrypted = make([]byte, len(plain))
	for bs, be := 0, cipher.BlockSize(); bs <= len(origData); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
		cipher.Encrypt(encrypted[bs:be], plain[bs:be])
	}

	return encrypted
}

func AesDecryptECB(encrypted []byte, key []byte) (decrypted []byte) {
	cipher, _ := aes.NewCipher(generateKey(key))
	decrypted = make([]byte, len(encrypted))
	for bs, be := 0, cipher.BlockSize(); bs < len(encrypted); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
		cipher.Decrypt(decrypted[bs:be], encrypted[bs:be])
	}

	trim := 0
	if len(decrypted) > 0 {
		trim = len(decrypted) - int(decrypted[len(decrypted)-1])
	}

	return decrypted[:trim]
}

func generateKey(key []byte) (genKey []byte) {
	genKey = make([]byte, 16)
	copy(genKey, key)
	for i := 16; i < len(key); {
		for j := 0; j < 16 && i < len(key); j, i = j+1, i+1 {
			genKey[j] ^= key[i]
		}
	}
	return genKey
}