Unbewohnte
4 years ago
9 changed files with 212 additions and 46 deletions
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package encryption |
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import ( |
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"crypto/aes" |
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"crypto/cipher" |
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"fmt" |
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) |
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// Decrypts encrypted aes data with given key.
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// https://www.melvinvivas.com/how-to-encrypt-and-decrypt-data-using-aes/ - very grateful to the author, THANK YOU.
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func Decrypt(key, dataToDecrypt []byte) ([]byte, error) { |
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block, err := aes.NewCipher(key) |
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if err != nil { |
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return nil, fmt.Errorf("could not create new AES cipher: %s", err) |
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} |
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aesGCM, err := cipher.NewGCM(block) |
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if err != nil { |
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return nil, fmt.Errorf("could not create new GCM: %s", err) |
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} |
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nonce, encryptedBytes := dataToDecrypt[:aesGCM.NonceSize()], dataToDecrypt[aesGCM.NonceSize():] |
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decryptedData, err := aesGCM.Open(nil, nonce, encryptedBytes, nil) |
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if err != nil { |
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return nil, fmt.Errorf("could not decrypt given data: %s", err) |
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} |
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return decryptedData, nil |
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} |
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@ -0,0 +1,24 @@
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package encryption |
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import ( |
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"crypto/aes" |
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"crypto/cipher" |
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"fmt" |
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) |
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// Encrypts given data using aes encryption.
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// https://www.melvinvivas.com/how-to-encrypt-and-decrypt-data-using-aes/ - very grateful to the author, THANK YOU.
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func Encrypt(key, dataToEncrypt []byte) ([]byte, error) { |
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block, err := aes.NewCipher(key) |
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if err != nil { |
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return nil, fmt.Errorf("could not create new AES cipher: %s", err) |
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} |
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aesGCM, err := cipher.NewGCM(block) |
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if err != nil { |
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return nil, fmt.Errorf("could not create new GCM: %s", err) |
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} |
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nonce := make([]byte, aesGCM.NonceSize()) |
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encryptedData := aesGCM.Seal(nonce, nonce, dataToEncrypt, nil) |
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return encryptedData, nil |
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} |
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@ -0,0 +1,27 @@
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package encryption |
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import ( |
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"math/rand" |
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"time" |
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) |
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// using aes256, so 32 bytes-long key
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const KEYLEN uint = 32 |
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const CHARS string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" |
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// Generates 32 pseudo-random bytes to use as a key
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func Generate32AESkey() []byte { |
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var generatedKey []byte |
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rand.Seed(time.Now().UTC().UnixNano()) |
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// choosing "random" 32 bytes from CHARS
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for { |
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if len(generatedKey) == int(KEYLEN) { |
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break |
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} |
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randomIndex := rand.Intn(len(CHARS)) |
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generatedKey = append(generatedKey, CHARS[randomIndex]) |
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} |
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return generatedKey |
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} |
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