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package util
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"encoding/base64"
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"fmt"
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)
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type AesEncrypter struct {
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key []byte
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iv []byte
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block cipher.Block
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}
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var AesEcpt AesEncrypter
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func init() {
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AesEcpt.key = []byte("bGcGfWb3Kg2s4gcG")
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AesEcpt.iv = []byte("aebksHkG4jAEk2Ag")
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var err error
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AesEcpt.block, err = aes.NewCipher(AesEcpt.key)
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if err != nil {
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panic(err)
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}
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}
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// 加密
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func (a *AesEncrypter) AesBase64Encrypt(in string) (string, error) {
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origData := []byte(in)
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origData = PKCS5Padding(origData, a.block.BlockSize())
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crypted := make([]byte, len(origData))
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// 根据CryptBlocks方法的说明，如下方式初始化crypted也可以
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bm := cipher.NewCBCEncrypter(a.block, a.iv)
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bm.CryptBlocks(crypted, origData)
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var b = base64.StdEncoding.EncodeToString(crypted)
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return b, nil
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}
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// 解密
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func (a *AesEncrypter) AesBase64Decrypt(b string) (string, error) {
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crypted, err := base64.StdEncoding.DecodeString(b)
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if err != nil {
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fmt.Printf("err: %v\n", err)
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}
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origData := make([]byte, len(crypted))
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bm := cipher.NewCBCDecrypter(a.block, a.iv)
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bm.CryptBlocks(origData, crypted)
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origData = PKCS5UnPadding(origData)
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var out = string(origData)
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return out, nil
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}
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func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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func PKCS5UnPadding(origData []byte) []byte {
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length := len(origData)
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// 去掉最后一个字节 unpadding 次
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unpadding := int(origData[length-1])
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return origData[:(length - unpadding)]
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}
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