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43 lines
948 B
Go
43 lines
948 B
Go
package main
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import (
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"crypto/aes"
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"crypto/cipher"
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"math/rand"
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)
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// If math/rand.Seed() is not called, the generator behaves as if seeded by rand.Seed(1),
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// so the generator is deterministic.
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// genAesKey generates a 128bit AES Key
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func genAesKey() []byte {
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return genRandBytes(16)
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}
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// genAesKey generates a 128bit nonce
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func genNonce() []byte {
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return genRandBytes(12)
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}
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// genRandBytes return a random []byte with the length of size
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func genRandBytes(size int) []byte {
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buffer := make([]byte, size)
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rand.Read(buffer) // error is always nil so save to ignore
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return buffer
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}
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// encAes encrypt data with AesKey in AES gcm mode
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func encAes(data []byte, AesKey []byte) ([]byte, error) {
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block, _ := aes.NewCipher(AesKey)
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nonce := genNonce()
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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ciphertext := aesgcm.Seal(nil, nonce, data, nil)
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encData := append(nonce, ciphertext...)
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return encData, nil
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}
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