68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package utils
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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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"errors"
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"io"
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)
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func EncryptAES(data string, key string) (string, error) {
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encrypted, err := EncryptBytesAES([]byte(data), key)
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if err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(encrypted), nil
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}
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func EncryptBytesAES(plainText []byte, key string) ([]byte, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return nil, 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 nil, 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 cipherText, nil
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}
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func DecryptAES(data string, key string) (string, error) {
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text, err := base64.RawURLEncoding.DecodeString(data)
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if err != nil {
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return "", err
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}
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decrypted, err := DecryptBytesAES(text, key)
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if err != nil {
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return "", err
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}
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return string(decrypted), nil
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}
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func DecryptBytesAES(cipherText []byte, key string) ([]byte, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return nil, err
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}
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if len(cipherText) < aes.BlockSize {
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err = errors.New("Ciphertext block size is too short!")
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return nil, 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 cipherText, err
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}
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