You've already forked img-proxy-url-generator
39 lines
824 B
Go
39 lines
824 B
Go
package generator
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"io"
|
|
)
|
|
|
|
func pkcs7pad(data []byte, blockSize int) []byte {
|
|
padLen := blockSize - len(data)%blockSize
|
|
padding := bytes.Repeat([]byte{byte(padLen)}, padLen)
|
|
return append(data, padding...)
|
|
}
|
|
|
|
func (g *Generator) generateBaseAesEncUrl(file []byte) (string, error) {
|
|
c, err := aes.NewCipher(g.config.encryptionKeyBin)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
data := pkcs7pad(file, aes.BlockSize)
|
|
|
|
ciphertext := make([]byte, aes.BlockSize+len(data))
|
|
iv := ciphertext[:aes.BlockSize]
|
|
|
|
if _, err = io.ReadFull(rand.Reader, iv); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
mode := cipher.NewCBCEncrypter(c, iv)
|
|
mode.CryptBlocks(ciphertext[aes.BlockSize:], data)
|
|
|
|
encryptedURL := g.generateBase64Url(ciphertext)
|
|
|
|
return "enc/" + encryptedURL, nil
|
|
}
|