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31 lines
817 B
31 lines
817 B
3 years ago
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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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