67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
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package xcrypto
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import (
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"crypto/aes"
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"encoding/base64"
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"errors"
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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 []byte) *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 base64.StdEncoding.EncodeToString(encrypted)
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}
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func (a Aes) DecryptECB(src string) (string, error) {
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encrypted, err := base64.StdEncoding.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 []byte) (genKey []byte) {
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genKey = make([]byte, 16)
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copy(genKey, key)
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for i := 16; i < len(key); {
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for j := 0; j < 16 && i < len(key); j, i = j+1, i+1 {
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genKey[j] ^= key[i]
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}
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}
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return genKey
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}
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