58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
package crypto
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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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"fmt"
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"io"
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)
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// Base64AESEncode AES encode
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func Base64AESEncode(key []byte, text string) (string, error) {
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plaintext := []byte(text)
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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// The IV needs to be unique, but not secure. Therefore it's common to
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// include it at the beginning of the ciphertext.
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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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// convert to base64
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// Base64AESDecode AES decode
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func Base64AESDecode(key []byte, cryptoText string) (string, error) {
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ciphertext, _ := base64.StdEncoding.DecodeString(cryptoText)
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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// The IV needs to be unique, but not secure. Therefore it's common to
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// include it at the beginning of the ciphertext.
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if len(ciphertext) < aes.BlockSize {
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return "", fmt.Errorf("ciphertext too short")
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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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// XORKeyStream can work in-place if the two arguments are the same.
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stream.XORKeyStream(ciphertext, ciphertext)
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return fmt.Sprintf("%s", ciphertext), nil
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}
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