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1 file changed, 43 insertions
aes.go(file creato)
| @@ -0,0 +1,43 @@ | |||
| 1 | + | package utils | |
| 2 | + | ||
| 3 | + | import ( | |
| 4 | + | "bytes" | |
| 5 | + | "crypto/aes" | |
| 6 | + | "crypto/cipher" | |
| 7 | + | ) | |
| 8 | + | ||
| 9 | + | func encrypt(aesKey, plaintextMsg []byte) ([]byte, error) { | |
| 10 | + | block, err := aes.NewCipher(aesKey) | |
| 11 | + | if err != nil { | |
| 12 | + | return []byte{}, err | |
| 13 | + | } | |
| 14 | + | plaintextMsg = pkcs5Padding(plaintextMsg, block.BlockSize()) | |
| 15 | + | cipherText := make([]byte, len(plaintextMsg)) | |
| 16 | + | cipher.NewCBCEncrypter(block, aesKey[:block.BlockSize()]). | |
| 17 | + | CryptBlocks(cipherText, plaintextMsg) | |
| 18 | + | return cipherText, nil | |
| 19 | + | } | |
| 20 | + | ||
| 21 | + | func decrypt(aesKey, encryptMsg []byte) ([]byte, error) { | |
| 22 | + | block, err := aes.NewCipher(aesKey) | |
| 23 | + | if err != nil { | |
| 24 | + | return []byte{}, err | |
| 25 | + | } | |
| 26 | + | decryptedMsg := make([]byte, len(encryptMsg)) | |
| 27 | + | cipher.NewCBCDecrypter(block, aesKey[:block.BlockSize()]). | |
| 28 | + | CryptBlocks(decryptedMsg, encryptMsg) | |
| 29 | + | decryptedMsg = pkcs5UnPadding(decryptedMsg) | |
| 30 | + | return encryptMsg, nil | |
| 31 | + | } | |
| 32 | + | ||
| 33 | + | func pkcs5Padding(ciphertext []byte, blockSize int) []byte { | |
| 34 | + | padding := blockSize - len(ciphertext)%blockSize | |
| 35 | + | padtext := bytes.Repeat([]byte{byte(padding)}, padding) | |
| 36 | + | return append(ciphertext, padtext...) | |
| 37 | + | } | |
| 38 | + | ||
| 39 | + | func pkcs5UnPadding(origData []byte) []byte { | |
| 40 | + | length := len(origData) | |
| 41 | + | unpadding := int(origData[length-1]) | |
| 42 | + | return origData[:(length - unpadding)] | |
| 43 | + | } | |
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