?????, ???? ??? ???! Go? ???? ???? ??? ??? ????? Go? ?? ??? ??? ?? ????? ??? ???? ??? ?????. ?? ?? ?????? ???? ??? ??? ???? ?? ??? ??? ??? ??? ???????(??? ? ??? ? ??? ???? ?? ??????!).

?3? ???? ????

Go? ?3? ???? ?????? ????? ???? ????. ?? ?? ? ??? ??? ???.

1. golang.org/x/crypto: ?? ???

??? Go ???? ???? ?? DLC? ????. ?? ?? ? ???? ???:

• ??? ?? ??? ????(?? ???? ??? ??? ?????? ? ? ??)
• ChaCha20-Poly1305 (?? ???)
• bcrypt ? scrypt? ?? ???? ?? ??(?? ????? ??? ??? ?? ??)

ChaCha20-Poly1305? ??:

import (
    "golang.org/x/crypto/chacha20poly1305"
    "crypto/rand"
)

func encryptWithChaCha20Poly1305(key, plaintext, additionalData []byte) ([]byte, error) {
    aead, err := chacha20poly1305.New(key)
    if err != nil {
        return nil, err
    }

    nonce := make([]byte, aead.NonceSize())
    if _, err := rand.Read(nonce); err != nil {
        return nil, err
    }

    return aead.Seal(nonce, nonce, plaintext, additionalData), nil
}

?? ??? ? ? ?? ?? ? ???? ???? ?? ????!

2. github.com/cloudflare/cfssl: PKI? ??? ?? ?

CFSSL? PKI ??? ??? ??? ?? ?? ?? ?? ????. ??? ??? ???? ?? ? ? ?????.

import (
    "github.com/cloudflare/cfssl/csr"
    "github.com/cloudflare/cfssl/initca"
)

func generateCA() ([]byte, []byte, error) {
    req := &csr.CertificateRequest{
        CN: "My Awesome Custom CA",
        KeyRequest: &csr.KeyRequest{
            A: "rsa",
            S: 2048,
        },
    }

    return initca.New(req)
}

??? ??? ?? ??? ? ?? ?? ????!

3. github.com/square/go-jose: JOSE ???

? ?????? JOSE(JSON ?? ?? ? ???)? ?? ?? ?? ?????. JWT ? ???? ?? ???? ? ? ?????.

import (
    "github.com/square/go-jose/v3"
    "github.com/square/go-jose/v3/jwt"
)

func createSignedJWT(privateKey interface{}, claims map[string]interface{}) (string, error) {
    signer, err := jose.NewSigner(jose.SigningKey{Algorithm: jose.RS256, Key: privateKey}, nil)
    if err != nil {
        return "", err
    }

    return jwt.Signed(signer).Claims(claims).CompactSerialize()
}

??? ??? ???? ?? ?? ????!

??? ??? ?? ???

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

??? ???(??? ?? ???? ??) XOR ??? ????.

type XORCipher struct {
    key []byte
}

func NewXORCipher(key []byte) *XORCipher {
    return &XORCipher{key: key}
}

func (c *XORCipher) Encrypt(plaintext []byte) []byte {
    ciphertext := make([]byte, len(plaintext))
    for i := 0; i < len(plaintext); i++ {
        ciphertext[i] = plaintext[i] ^ c.key[i%len(c.key)]
    }
    return ciphertext
}

func (c *XORCipher) Decrypt(ciphertext []byte) []byte {
    return c.Encrypt(ciphertext) // XOR is symmetric
}

Go? ?? ?????? ? ????? ??? cipher.Block ?????? ??? ? ????.

import "crypto/cipher"

type XORBlock struct {
    key []byte
}

func NewXORBlock(key []byte) (cipher.Block, error) {
    return &XORBlock{key: key}, nil
}

func (b *XORBlock) BlockSize() int {
    return len(b.key)
}

func (b *XORBlock) Encrypt(dst, src []byte) {
    for i := 0; i < len(src); i++ {
        dst[i] = src[i] ^ b.key[i%len(b.key)]
    }
}

func (b *XORBlock) Decrypt(dst, src []byte) {
    b.Encrypt(dst, src)
}

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

block, _ := NewXORBlock([]byte("mysupersecretkey"))
mode := cipher.NewCBCEncrypter(block, iv)
mode.CryptBlocks(ciphertext, plaintext)

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

Go? ???? ??? ?? ???? ??

1. ??? ?? ?? ???: ???? ?? ?????? ?????. ??? ???? ???? ?? ????? ??? ??? ?? ?????.

2. ???? ???? ?? ??? ?????: ???? ?????? ????? ???????. ???? ??? ??? ? ????!

3. ????? ??: ??? ????? ???? ???(?? ???), ??? ?? ?? ?? ??, ??? ???? ??? ?????. ???? ???? ??? ????.

4. ?? ???? ? ?????: Go? ????? ??? ? ?? ??? ?????? ???? ?????. ?? ??? ?? ? ?????.

5. ????? ?? ??? ?? ?? ????: ???? ?????! ??? ???? ??? ? ??? ???? ?????.

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

??? ?

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

?? ???? ??? ???? ?? ??? ???? ????! ???? ??? ??, ???? ???!

? ??? Go&#? ???? ??? ??: ?? ????? ? ??? ???, Go Crypto 12? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!