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|
defmodule Hex.Crypto.Encryption do
@moduledoc false
alias Hex.Crypto
alias Hex.Crypto.ContentEncryptor
alias Hex.Crypto.KeyManager
def encrypt({tag, plain_text}, protected, opts) do
case KeyManager.encrypt(protected, opts) do
{:ok, protected, key, encrypted_key, content_encryptor} ->
iv = ContentEncryptor.generate_iv(content_encryptor)
protected = :erlang.term_to_binary(protected)
aad = tag <> protected
{cipher_text, cipher_tag} =
ContentEncryptor.encrypt(content_encryptor, key, iv, {aad, plain_text})
%{
protected: protected,
encrypted_key: encrypted_key,
iv: iv,
cipher_text: cipher_text,
cipher_tag: cipher_tag
}
|> :erlang.term_to_binary()
|> Crypto.base64url_encode()
encrypt_init_error ->
encrypt_init_error
end
end
def decrypt({tag, cipher_text}, opts) do
{:ok, cipher_text} = Crypto.base64url_decode(cipher_text)
%{
protected: protected,
encrypted_key: encrypted_key,
iv: iv,
cipher_text: cipher_text,
cipher_tag: cipher_tag
} = Hex.Utils.safe_binary_to_term!(cipher_text, [:safe])
aad = tag <> protected
protected = Hex.Utils.safe_binary_to_term!(protected, [:safe])
case KeyManager.decrypt(protected, encrypted_key, opts) do
{:ok, key, content_encryptor} ->
ContentEncryptor.decrypt(content_encryptor, key, iv, {aad, cipher_text, cipher_tag})
decrypt_init_error ->
decrypt_init_error
end
rescue
ArgumentError ->
:error
end
end
|
