78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
package tkcrypto
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import (
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"crypto/aes"
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"crypto/md5"
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"encoding/hex"
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"errors"
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"strings"
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)
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// key字节长度16
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type Aes struct {
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key []byte
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}
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// NewAes
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func NewAes(key string) *Aes {
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return &Aes{key: generateKey(key)}
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}
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func (a Aes) EncryptECB(src string) string {
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origData := []byte(src)
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cipher, _ := aes.NewCipher(a.key)
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length := (len(origData) + aes.BlockSize) / aes.BlockSize
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plain := make([]byte, length*aes.BlockSize)
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copy(plain, origData)
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pad := byte(len(plain) - len(origData))
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for i := len(origData); i < len(plain); i++ {
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plain[i] = pad
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}
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encrypted := make([]byte, len(plain))
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for bs, be := 0, cipher.BlockSize(); bs <= len(origData); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
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cipher.Encrypt(encrypted[bs:be], plain[bs:be])
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}
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return hex.EncodeToString(encrypted)
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}
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func (a Aes) DecryptECB(src string) (string, error) {
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encrypted, err := hex.DecodeString(src)
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if err != nil {
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return "", err
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}
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cipher, _ := aes.NewCipher(a.key)
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decrypted := make([]byte, len(encrypted))
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for bs, be := 0, cipher.BlockSize(); bs < len(encrypted); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
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cipher.Decrypt(decrypted[bs:be], encrypted[bs:be])
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}
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trim := 0
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if len(decrypted) > 0 {
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trim = len(decrypted) - int(decrypted[len(decrypted)-1])
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}
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if trim < 0 {
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return "", errors.New("decrypt error")
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}
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return string(decrypted[:trim]), nil
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}
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func generateKey(key string) (genKey []byte) {
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hash := md5.New()
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hash.Write([]byte(key))
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md5Hash := hex.EncodeToString(hash.Sum(nil))
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fileName := strings.ToUpper(md5Hash)
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//需要兼容Nodejs
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return generateMd5Key(fileName)
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}
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func generateMd5Key(str string) []byte {
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checksum := md5.Sum([]byte(str))
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return checksum[0:]
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}
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