forked from cloudfoundry/gorouter
/
crypto.go
73 lines (57 loc) · 1.36 KB
/
crypto.go
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package secure
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha256"
"golang.org/x/crypto/pbkdf2"
)
type Crypto interface {
Encrypt(plainText []byte) (cipherText []byte, nonce []byte, err error)
Decrypt(cipherText, nonce []byte) ([]byte, error)
}
type AesGCM struct {
cipher.AEAD
}
func NewAesGCM(key []byte) (*AesGCM, error) {
aes, err := aes.NewCipher(key)
if err != nil {
return &AesGCM{}, err
}
aead, err := cipher.NewGCM(aes)
if err != nil {
return &AesGCM{}, err
}
aesGCM := AesGCM{aead}
return &aesGCM, nil
}
func (gcm *AesGCM) Encrypt(plainText []byte) (cipherText, nonce []byte, err error) {
nonce, err = gcm.generateNonce()
if err != nil {
return nil, nil, err
}
cipherText = gcm.Seal(nil, nonce, plainText, []byte{})
return cipherText, nonce, nil
}
func (gcm *AesGCM) Decrypt(cipherText, nonce []byte) ([]byte, error) {
plainText, err := gcm.Open(nil, nonce, cipherText, []byte{})
if err != nil {
return nil, err
}
return plainText, nil
}
func NewPbkdf2(input []byte, keyLen int) []byte {
noSalt := []byte("")
return pbkdf2.Key(input, noSalt, 100001, keyLen, sha256.New)
}
func (gcm *AesGCM) generateNonce() ([]byte, error) {
return randomBytes(uint(gcm.NonceSize()))
}
func randomBytes(size uint) ([]byte, error) {
b := make([]byte, size)
_, err := rand.Read(b)
if err != nil {
return nil, err
}
return b, nil
}