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package content_crypt //nolint:golint
import (
"fmt"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwe/internal/cipher"
)
func (c Generic) Algorithm() jwa.ContentEncryptionAlgorithm {
return c.alg
}
func (c Generic) Encrypt(cek, plaintext, aad []byte) ([]byte, []byte, []byte, error) {
iv, encrypted, tag, err := c.cipher.Encrypt(cek, plaintext, aad)
if err != nil {
return nil, nil, nil, fmt.Errorf(`failed to crypt content: %w`, err)
}
return iv, encrypted, tag, nil
}
func (c Generic) Decrypt(cek, iv, ciphertext, tag, aad []byte) ([]byte, error) {
return c.cipher.Decrypt(cek, iv, ciphertext, tag, aad)
}
func NewGeneric(alg jwa.ContentEncryptionAlgorithm) (*Generic, error) {
c, err := cipher.NewAES(alg)
if err != nil {
return nil, fmt.Errorf(`aes crypt: failed to create content cipher: %w`, err)
}
return &Generic{
alg: alg,
cipher: c,
keysize: c.KeySize(),
tagsize: 16,
}, nil
}
func (c Generic) KeySize() int {
return c.keysize
}
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