package cipher import ( "crypto/cipher" "github.com/lestrrat-go/jwx/jwe/internal/keygen" ) const ( TagSize = 16 ) // ContentCipher knows how to encrypt/decrypt the content given a content // encryption key and other data type ContentCipher interface { KeySize() int Encrypt(cek, aad, plaintext []byte) ([]byte, []byte, []byte, error) Decrypt(cek, iv, aad, ciphertext, tag []byte) ([]byte, error) } type Fetcher interface { Fetch([]byte) (cipher.AEAD, error) } type gcmFetcher struct{} type cbcFetcher struct{} // AesContentCipher represents a cipher based on AES type AesContentCipher struct { NonceGenerator keygen.Generator fetch Fetcher keysize int tagsize int }