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GoLang Encrypt string to base64 and vice versa using AES encryption.
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| package main | |
| import ( | |
| "crypto/aes" | |
| "crypto/cipher" | |
| "crypto/rand" | |
| "encoding/base64" | |
| "fmt" | |
| "io" | |
| "log" | |
| ) | |
| func main() { | |
| // original text | |
| oText := "TEST TEXT TO TEST" | |
| fmt.Printf("Orig text:\t%v\n", oText) | |
| // key (only for test :)) | |
| key := []byte("SuperDuperKey_16") | |
| // encrypt string to base64 | |
| cText := encrypt(key, oText) | |
| fmt.Printf("Crypt text:\t%v\n", cText) | |
| // decrypt base64 to string | |
| dText := decrypt(key, cText) | |
| fmt.Printf("DeCrypt text:\t%v\n", dText) | |
| } | |
| /// | |
| /// encrypt string to base64 crypto using AES | |
| /// | |
| func encrypt(key []byte, text string) string { | |
| // Cast plain string to a slice of bytes | |
| plaintext := []byte(text) | |
| // Cipher obj that uses passed key as... key | |
| block, err := aes.NewCipher(key) | |
| if err != nil { | |
| log.Print(err) | |
| } | |
| // Prepare to store cipher text | |
| ciphertext := make([]byte, aes.BlockSize+len(plaintext)) | |
| // Fill with random numbers, using rand pkg, not math pkg | |
| iv := ciphertext[:aes.BlockSize] | |
| if _, err := io.ReadFull(rand.Reader, iv); err != nil { | |
| log.Print(err) | |
| } | |
| // ENCRYPTION | |
| stream := cipher.NewCFBEncrypter(block, iv) | |
| stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext) | |
| // Return as base64 | |
| return base64.URLEncoding.EncodeToString(ciphertext) | |
| } | |
| /// | |
| /// decrypt from base64 to decrypted string | |
| /// | |
| func decrypt(key []byte, cryptoText string) string { | |
| // Interpret the Base64 encode of a gived string as []byte | |
| ciphertext, err := base64.URLEncoding.DecodeString(cryptoText) | |
| if err != nil { | |
| log.Print(err) | |
| } | |
| if len(ciphertext) < aes.BlockSize { | |
| log.Print("Ciphertext is too short!") | |
| } | |
| // Cipher obj that uses passed key as... key | |
| block, err := aes.NewCipher(key) | |
| if err != nil { | |
| log.Print(err) | |
| } | |
| // Prepare slices for decryption process, notice the colons | |
| iv := ciphertext[:aes.BlockSize] //< Must be first, unmodified Rside | |
| ciphertext = ciphertext[aes.BlockSize:] //< Must be second, modify Lside | |
| // DECRYPTION | |
| stream := cipher.NewCFBDecrypter(block, iv) | |
| stream.XORKeyStream(ciphertext, ciphertext) | |
| // Return as string | |
| return fmt.Sprintf("%s", ciphertext) | |
| } |
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