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/
decrypt.go
106 lines (87 loc) · 2.26 KB
/
decrypt.go
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package nacl
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"golang.org/x/crypto/nacl/box"
kclient "sigs.k8s.io/controller-runtime/pkg/client"
)
const (
EncPrefix = "ACORNENC:"
EncSuffix = "::"
)
func IsAcornEncryptedData(data []byte) bool {
return strings.HasPrefix(string(data), EncPrefix)
}
func DecryptNamespacedDataMap(ctx context.Context, c kclient.Reader, data map[string][]byte, ownerNamespace string) (map[string][]byte, error) {
to := map[string][]byte{}
for k, v := range data {
if IsAcornEncryptedData(v) {
decryptedData, err := DecryptNamespacedData(ctx, c, v, ownerNamespace)
if err != nil {
return data, err
}
to[k] = decryptedData
continue
}
to[k] = v
}
return to, nil
}
func DecryptNamespacedData(ctx context.Context, c kclient.Reader, data []byte, namespace string) ([]byte, error) {
keys, err := GetAllNaclKeys(ctx, c, namespace)
if err != nil {
return nil, err
}
var errs []error
for _, key := range keys {
data, err := key.Decrypt(data)
if err == nil {
return data, nil
} else {
errs = append(errs, fmt.Errorf("pubkey %s: %w", KeyBytesToB64String(key.PublicKey), err))
}
}
return nil, &ErrUnableToDecrypt{
Errs: errs,
}
}
func (k *NaclKey) Decrypt(encData []byte) ([]byte, error) {
pubKeyString := KeyBytesToB64String(k.PublicKey)
preppedData, err := unwrapForDecryption(encData)
if err != nil {
return nil, err
}
encryptedData, ok := preppedData[pubKeyString]
if !ok {
return nil, &ErrDecryptionKeyNotAvailable{}
}
decryptedBytes, ok := box.OpenAnonymous(nil, encryptedData, k.PublicKey, k.privateKey)
if !ok {
return nil, &ErrUnableToDecrypt{}
}
return decryptedBytes, nil
}
func unwrapForDecryption(data []byte) (map[string][]byte, error) {
trimmedData := strings.TrimPrefix(string(data), EncPrefix)
trimmedData = strings.TrimSuffix(trimmedData, EncSuffix)
data, err := base64.RawURLEncoding.DecodeString(trimmedData)
if err != nil {
return nil, err
}
mappedData := &map[string]string{}
err = json.Unmarshal(data, mappedData)
if err != nil {
return nil, err
}
returnData := map[string][]byte{}
for k, v := range *mappedData {
returnData[k], err = base64.RawURLEncoding.DecodeString(v)
if err != nil {
return nil, err
}
}
return returnData, err
}