?????, ???? ??? ???! ?? ???? ??? ??? ??? ????? ?? ??? ??? ?? ???? ??????. ? ????? ??? ? ?? ??? ???? ?????. ?? ???? Go? ??? ?? ??? ???? ? ??? ??? ??? ???????!

?? ??: ?? ??

?? ?? ??? ????. ?? ??? ??? ?? ??? ????. ?, ??? ??? ??? ????? ?????. ?? ?? ???? AES(Advanced Encryption Standard)???.

AES: ??? ???

AES? ???? ??? ?? ?? ????. ????? ???? ?? ?????. Go?? ???? ??? ??? ????.

import (
    "crypto/aes"
    "crypto/rand"
    "fmt"
)

func main() {
    // Let's create a 256-bit key (32 bytes)
    key := make([]byte, 32)
    if _, err := rand.Read(key); err != nil {
        panic("Oops, the universe's randomness machine broke!")
    }

    block, err := aes.NewCipher(key)
    if err != nil {
        panic("AES threw a tantrum!")
    }

    fmt.Printf("Our AES block size: %d bytes\n", block.BlockSize())
}

??? ?? AES? ?????, ?? ?? ??? ?? ?? ???? ????. ?????? ?? ??? ????? ????. ??? ?? ?? ??? ??? ????? ?? ???? ?? ?? ???????.

??? ??: ??? ???? ?

???? ??? ??? ????. ?? ????? ?? ???? XOR? ???? ???? ??? ??? ?? ?? ???? ????. Go? ????? ?? ??? ??? ChaCha20? ?????.

ChaCha20: ? ? ?? ? ? ??

ChaCha20? ???? ??? ??? ????.

import (
    "fmt"
    "golang.org/x/crypto/chacha20"
)

func main() {
    key := make([]byte, chacha20.KeySize)
    nonce := make([]byte, chacha20.NonceSize)

    cipher, err := chacha20.NewUnauthenticatedCipher(key, nonce)
    if err != nil {
        panic("ChaCha20 isn't feeling chatty today!")
    }

    secretMessage := []byte("ChaCha20 is my new dance move!")
    encrypted := make([]byte, len(secretMessage))
    cipher.XORKeyStream(encrypted, secretMessage)

    fmt.Printf("Our secret dance move, encrypted: %x\n", encrypted)
}

ChaCha20? ??? ??? ?, ?? AES ???? ??? ?? ????? ?????.

?? ??: ?? ?? ??? ???

?? ?? ??? ?? ???? ?????. ?? ??? ??? ????. ?? ??? ???? ???? ???? ????? ??? ?????.

GCM(???/??? ??): ??? ?? ?

GCM? ??? ??? ??? ?? ?? ????. ?? ???? ???? ?? ????? ???? ?? ??? ?? ?????. ?? ??? ??? ????.

import (
    "crypto/aes"
    "crypto/cipher"
    "crypto/rand"
    "fmt"
)

func main() {
    key := make([]byte, 32)
    if _, err := rand.Read(key); err != nil {
        panic("The random number generator went on strike!")
    }

    block, err := aes.NewCipher(key)
    if err != nil {
        panic("AES is having an existential crisis!")
    }

    nonce := make([]byte, 12)
    if _, err := rand.Read(nonce); err != nil {
        panic("Nonce generator is feeling noncommittal!")
    }

    aesgcm, err := cipher.NewGCM(block)
    if err != nil {
        panic("GCM mode is feeling moody!")
    }

    secretMessage := []byte("AES-GCM: Making encryption great again!")
    encrypted := aesgcm.Seal(nil, nonce, secretMessage, nil)

    fmt.Printf("Our encrypted message: %x\n", encrypted)

    // Let's decrypt it to make sure it worked
    decrypted, err := aesgcm.Open(nil, nonce, encrypted, nil)
    if err != nil {
        panic("Decryption failed! Did someone tamper with our message?")
    }

    fmt.Printf("Decrypted message: %s\n", decrypted)
}

CTR(??? ??): Streamifier

CTR ??? ?? ??? ??? ??? ??? ?? ???? ????. ??? ???? ???? ????? ?? ??? ????? ???? ?? ? ?????.

import (
    "crypto/aes"
    "crypto/cipher"
    "crypto/rand"
    "fmt"
)

func main() {
    key := make([]byte, 32)
    if _, err := rand.Read(key); err != nil {
        panic("Random number generator is feeling random about its job!")
    }

    block, err := aes.NewCipher(key)
    if err != nil {
        panic("AES is having a block party, and we're not invited!")
    }

    iv := make([]byte, aes.BlockSize)
    if _, err := rand.Read(iv); err != nil {
        panic("IV generator is feeling too independent!")
    }

    stream := cipher.NewCTR(block, iv)

    secretMessage := []byte("CTR mode: Turning blocks into streams since 1979!")
    encrypted := make([]byte, len(secretMessage))
    stream.XORKeyStream(encrypted, secretMessage)

    fmt.Printf("Our streamed secret: %x\n", encrypted)

    // Let's decrypt it
    decrypted := make([]byte, len(encrypted))
    stream = cipher.NewCTR(block, iv) // Reset the stream
    stream.XORKeyStream(decrypted, encrypted)

    fmt.Printf("Decrypted message: %s\n", decrypted)
}

?? ???? ???

?? ??? ? ??? ??? ???? ???? ? ? ?? ???? ??? ????.

1. GCM? ??? ?????: ???? ?? AES-GCM? ?????. ?? ???? ???? ????. ??? ???? ?? ?????.

2. Nonce? ?? ??????: ? ??? ???? ?? ??? nonce(? ? ???? ??)? ?????. ?? ? ?? ???? ?? ???? ????.

3. ???? ?????: crypto/rand? ???? ?? ?????. ??? ?? ???? ?? ?? ??? "password123"? ???? ?? ????.

4. CTR?? ??? ?????: CTR ??? ???? ?? ???? ???? ???? ?? ?????. ??? ??? ??? ?? MAC? ????? ?? ??????.

5. ?? ??? ?? ??? ????: ?? ? ?? ? ??? ?? ?? ??? ?????. ??? ??? ??? ???? ?? ???? "?? ??" ???? ???? ?? ????.

6. ??? ??? ?????: ??? ?? ??? ?? ?? ???? ???. ?? ? ??? ?? ?? ?? ??? ?? ????. ???? ?? ?? ?? ? ????!

??? ??????

?????! ?? ??? ??? ?? ???? ??????. ??? ??? ??? ?? ?? ??? ? ???? ???? ? ?????.

??? ? ?? ?? ?? ?? ??? ?? ??? ???? ??? ??? ?? ???? ??? ?? ?? ? ???? ??? ????, ?? ???? ?? ???? ???????. ?? ?? ??? ?? ??? ??? ????. ? ? ????? ????? ?? ????.

??? ????? ??? ?? ??? ???? ?? ?????. ??? ?? ?? ?? ?? ??? ?? ??? ?? ????. ??? ??? ??? Go?? ???? ??? ??????? ??? ? ? ??? ? ????.

?? ???? ??? ???? ???? ?? ?? ????? ??? AES-GCM? ???? ??? ?? ?? ?? ?? ????????? ??? ??? ??? ???? ??? ????! ??? ?? ???, ??? ???!

? ??? ?? ???: ???? ?? ??, Go Crypto 4? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!