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aead.go
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/
aead.go
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package jwk
import (
"encoding/base64"
"github.com/gtank/cryptopasta"
"github.com/pkg/errors"
)
type AEAD struct {
Key []byte
}
func (c *AEAD) Encrypt(plaintext []byte) (string, error) {
if len(c.Key) < 32 {
return "", errors.Errorf("Key must be 32 bytes, got %d bytes", len(c.Key))
}
var key [32]byte
copy(key[:], c.Key[:32])
ciphertext, err := cryptopasta.Encrypt(plaintext, &key)
if err != nil {
return "", errors.WithStack(err)
}
return base64.URLEncoding.EncodeToString(ciphertext), nil
}
func (c *AEAD) Decrypt(ciphertext string) ([]byte, error) {
if len(c.Key) < 32 {
return []byte{}, errors.Errorf("Key must be longer 32 bytes, got %d bytes", len(c.Key))
}
var key [32]byte
copy(key[:], c.Key[:32])
raw, err := base64.URLEncoding.DecodeString(ciphertext)
if err != nil {
return []byte{}, errors.WithStack(err)
}
plaintext, err := cryptopasta.Decrypt(raw, &key)
return plaintext, nil
}