mirror of https://github.com/ehang-io/nps
81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
package crypt
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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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"crypto/md5"
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"encoding/hex"
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"errors"
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"math/rand"
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"time"
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)
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//en
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func AesEncrypt(origData, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockSize := block.BlockSize()
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origData = PKCS5Padding(origData, blockSize)
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// origData = ZeroPadding(origData, block.BlockSize())
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blockMode := cipher.NewCBCEncrypter(block, key[: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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// crypted := origData
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blockMode.CryptBlocks(crypted, origData)
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return crypted, nil
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}
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//de
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func AesDecrypt(crypted, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockSize := block.BlockSize()
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blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
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origData := make([]byte, len(crypted))
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blockMode.CryptBlocks(origData, crypted)
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err, origData = PKCS5UnPadding(origData)
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return origData, err
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}
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//Completion when the length is insufficient
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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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//Remove excess
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func PKCS5UnPadding(origData []byte) (error, []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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if (length - unpadding) < 0 {
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return errors.New("len error"), nil
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}
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return nil, origData[:(length - unpadding)]
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}
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//Generate 32-bit MD5 strings
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func Md5(s string) string {
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h := md5.New()
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h.Write([]byte(s))
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return hex.EncodeToString(h.Sum(nil))
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}
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//Generating Random Verification Key
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func GetRandomString(l int) string {
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str := "0123456789abcdefghijklmnopqrstuvwxyz"
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bytes := []byte(str)
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result := []byte{}
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r := rand.New(rand.NewSource(time.Now().UnixNano()))
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for i := 0; i < l; i++ {
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result = append(result, bytes[r.Intn(len(bytes))])
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}
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return string(result)
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}
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