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65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
/*
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* Copyright 2017-2019 Kopano and its licensors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package encryption
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import (
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"fmt"
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"golang.org/x/crypto/nacl/secretbox"
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)
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const (
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// KeySize is the size of the keys created by GenerateKey()
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KeySize = 32
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// NonceSize is the size of the nonces created by GenerateNonce()
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NonceSize = 24
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)
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// Encrypt generates a random nonce and encrypts the input using nacl.secretbox
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// package. We store the nonce in the first 24 bytes of the encrypted text.
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func Encrypt(msg []byte, key *[KeySize]byte) ([]byte, error) {
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nonce, err := GenerateNonce()
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if err != nil {
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return nil, err
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}
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return encryptWithNonce(msg, nonce, key)
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}
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func encryptWithNonce(msg []byte, nonce *[NonceSize]byte, key *[KeySize]byte) ([]byte, error) {
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encrypted := secretbox.Seal(nonce[:], msg, nonce, key)
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return encrypted, nil
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}
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// Decrypt extracts the nonce from the encrypted text, and attempts to decrypt
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// with nacl.box.
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func Decrypt(msg []byte, key *[KeySize]byte) ([]byte, error) {
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if len(msg) < (NonceSize + secretbox.Overhead) {
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return nil, fmt.Errorf("wrong length of ciphertext")
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}
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var nonce [NonceSize]byte
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copy(nonce[:], msg[:NonceSize])
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decrypted, ok := secretbox.Open(nil, msg[NonceSize:], &nonce, key)
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if !ok {
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return nil, fmt.Errorf("decryption failed")
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}
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return decrypted, nil
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}
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