74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
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// Package secretbox is a config/secrets implementation that uses nacl/secretbox
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// to do symmetric encryption / verification
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package secretbox
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import (
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"github.com/micro/go-micro/v2/config/secrets"
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"github.com/pkg/errors"
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"golang.org/x/crypto/nacl/secretbox"
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"crypto/rand"
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)
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const keyLength = 32
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type secretBox struct {
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options secrets.Options
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secretKey [keyLength]byte
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}
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// NewCodec returns a secretbox codec
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func NewCodec(opts ...secrets.Option) secrets.Codec {
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sb := &secretBox{}
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for _, o := range opts {
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o(&sb.options)
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}
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return sb
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}
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func (s *secretBox) Init(opts ...secrets.Option) error {
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for _, o := range opts {
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o(&s.options)
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}
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if len(s.options.SecretKey) == 0 {
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return errors.New("no secret key is defined")
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}
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if len(s.options.SecretKey) != keyLength {
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return errors.Errorf("secret key must be %d bytes long", keyLength)
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}
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copy(s.secretKey[:], s.options.SecretKey)
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return nil
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}
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func (s *secretBox) Options() secrets.Options {
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return s.options
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}
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func (s *secretBox) String() string {
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return "nacl-secretbox"
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}
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func (s *secretBox) Encrypt(in []byte, opts ...secrets.EncryptOption) ([]byte, error) {
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// no opts are expected, so they are ignored
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// there must be a unique nonce for each message
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var nonce [24]byte
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if _, err := rand.Reader.Read(nonce[:]); err != nil {
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return []byte{}, errors.Wrap(err, "couldn't obtain a random nonce from crypto/rand")
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}
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return secretbox.Seal(nonce[:], in, &nonce, &s.secretKey), nil
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}
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func (s *secretBox) Decrypt(in []byte, opts ...secrets.DecryptOption) ([]byte, error) {
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// no options are expected, so they are ignored
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var decryptNonce [24]byte
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copy(decryptNonce[:], in[:24])
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decrypted, ok := secretbox.Open(nil, in[24:], &decryptNonce, &s.secretKey)
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if !ok {
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return []byte{}, errors.New("decryption failed (is the key set correctly?)")
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}
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return decrypted, nil
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}
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