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70 lines
1.8 KiB
70 lines
1.8 KiB
// Copyright (c) 2022 Proton AG |
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// |
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// This file is part of Proton Mail Bridge. |
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// |
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// Proton Mail Bridge is free software: you can redistribute it and/or modify |
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// it under the terms of the GNU General Public License as published by |
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// the Free Software Foundation, either version 3 of the License, or |
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// (at your option) any later version. |
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// |
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// Proton Mail Bridge is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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// |
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// You should have received a copy of the GNU General Public License |
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>. |
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//go:build !imaptest |
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// +build !imaptest |
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package credentials |
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import ( |
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"crypto/rand" |
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"encoding/base64" |
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"io" |
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"golang.org/x/crypto/nacl/secretbox" |
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) |
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func GenerateKey(size uint) []byte { |
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key := make([]byte, size) |
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if _, err := io.ReadFull(rand.Reader, key); err != nil { |
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panic(err) |
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} |
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return key |
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} |
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func generatePassword() string { |
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return base64.RawURLEncoding.EncodeToString(GenerateKey(16)) |
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} |
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func Decrypt(msg []byte, key [32]byte) ([]byte, error) { |
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if len(msg) < 24 { |
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return nil, ErrDecryptionFailed |
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} |
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// Read the nonce |
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var nonce [24]byte |
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copy(nonce[:], msg[:24]) |
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// Decrypt |
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decrypted, ok := secretbox.Open(nil, msg[24:], &nonce, &key) |
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if !ok { |
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return nil, ErrDecryptionFailed |
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} |
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return decrypted, nil |
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} |
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func Encrypt(msg []byte, key [32]byte) ([]byte, error) { |
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// Nonce must be different for each message |
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var nonce [24]byte |
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if _, err := io.ReadFull(rand.Reader, nonce[:]); err != nil { |
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return nil, err |
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} |
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// Encrypt the secret and append the result to the nonce |
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return secretbox.Seal(nonce[:], msg, &nonce, &key), nil |
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}
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