2017-04-18 03:45
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I want to generate rsa key pair(public and private), and then use them for AES encryption and decryption.e.g. Public key for Encryption and private key for Decryption.I wrote a simple code for this, but the problem is that when i run this code i get this error:

crypto/aes: invalid key size 1639

How can i resove this problem ?? My Encryption code is given bellow:

//genrarting private key
privateKey, err := rsa.GenerateKey(rand.Reader, 2014)
if err != nil {
privateKeyDer := x509.MarshalPKCS1PrivateKey(privateKey)
privateKeyBlock := pem.Block{
    Type:    "RSA PRIVATE KEY",
    Headers: nil,
    Bytes:   privateKeyDer,
privateKeyPem := string(pem.EncodeToMemory(&privateKeyBlock))

//using privateKeyPem for encryption
text := []byte("My name is Astaxie")
ciphertext, err := encrypt(text, []byte(privateKeyPem))
if err != nil {
    // TODO: Properly handle error
fmt.Printf("%s => %x
", text, ciphertext)

//Definition of encrypt()
func encrypt(plaintext []byte, key []byte) ([]byte, error) {
c, err := aes.NewCipher(key)
if err != nil {
    return nil, err

gcm, err := cipher.NewGCM(c)
if err != nil {
    return nil, err

nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
    return nil, err

return gcm.Seal(nonce, nonce, plaintext, nil), nil
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1条回答 默认 最新

  • doufang1889 2017-04-18 12:34

    As suggested in comments, i searched "hybrid cryptography" . And this example has solved my problem.

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