55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
package encryption
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"io"
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)
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type Encryption struct {
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Key []byte
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}
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func (e *Encryption) Encrypt(text string) (string, error) {
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plaintext := []byte(text)
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block, err := aes.NewCipher(e.Key)
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if err != nil {
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return "", err
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}
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cipherText := make([]byte, aes.BlockSize+len(plaintext))
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iv := cipherText[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return "", err
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}
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(cipherText[aes.BlockSize:], plaintext)
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return base64.URLEncoding.EncodeToString(cipherText), nil
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}
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func (e *Encryption) Decrypt(cryptoText string) (string, error) {
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cipherText, _ := base64.URLEncoding.DecodeString(cryptoText)
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block, err := aes.NewCipher(e.Key)
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if err != nil {
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return "", err
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}
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if len(cipherText) < aes.BlockSize {
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return "", err
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}
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iv := cipherText[:aes.BlockSize]
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cipherText = cipherText[aes.BlockSize:]
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(cipherText, cipherText)
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return string(cipherText), nil
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}
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