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package keyring
import (
"crypto/rand"
"crypto/x509"
"encoding/pem"
"github.com/pkg/errors"
)
// Keys represents a set of encryption/decryption keys.
type Keys [][]byte
// Encrypt will encrypt and then encode data into PEM-format.
func (k Keys) Encrypt(label string, data []byte) ([]byte, error) {
if len(k) == 0 {
k = Keys{[]byte{}}
}
//nolint:all SA1019 TODO migrate off deprecated method; usage is secure for at-rest data
block, err := x509.EncryptPEMBlock(rand.Reader, label, data, k[0], x509.PEMCipherAES256)
if err != nil {
return nil, err
}
data = pem.EncodeToMemory(block)
return data, err
}
// Decrypt will decrypt PEM-encoded data using the first successful key. The index of
// the used key is returned as n.
func (k Keys) Decrypt(pemData []byte) (data []byte, label string, err error) {
if len(k) == 0 {
k = Keys{[]byte{}}
}
block, _ := pem.Decode(pemData)
for _, key := range k {
//nolint:all SA1019 TODO migrate off deprecated method; usage is secure for at-rest data
data, err = x509.DecryptPEMBlock(block, key)
if err == nil {
return data, block.Type, nil
}
}
return nil, "", errors.New("invalid decryption key")
}
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