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86 lines
1.7 KiB
Go
86 lines
1.7 KiB
Go
package multiplex
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"golang.org/x/crypto/chacha20poly1305"
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)
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type Crypto interface {
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encrypt([]byte, []byte) ([]byte, error)
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decrypt([]byte, []byte) ([]byte, error)
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}
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type Plain struct{}
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func (p *Plain) encrypt(plaintext []byte, nonce []byte) ([]byte, error) {
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salt := make([]byte, 16)
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rand.Read(salt)
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return append(plaintext, salt...), nil
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}
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func (p *Plain) decrypt(buf []byte, nonce []byte) ([]byte, error) {
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return buf[:len(buf)-16], nil
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}
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type AESGCM struct {
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cipher cipher.AEAD
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}
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func MakeAESGCMCipher(key []byte) (*AESGCM, error) {
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c, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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g, err := cipher.NewGCM(c)
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if err != nil {
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return nil, err
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}
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ret := AESGCM{
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g,
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}
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return &ret, nil
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}
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func (a *AESGCM) encrypt(plaintext []byte, nonce []byte) ([]byte, error) {
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ciphertext := a.cipher.Seal(nil, nonce, plaintext, nil)
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return ciphertext, nil
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}
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func (a *AESGCM) decrypt(ciphertext []byte, nonce []byte) ([]byte, error) {
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plain, err := a.cipher.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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return plain, nil
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}
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type C20P1305 struct {
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cipher cipher.AEAD
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}
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func MakeCPCipher(key []byte) (*C20P1305, error) {
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c, err := chacha20poly1305.New(key)
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if err != nil {
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return nil, err
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}
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ret := C20P1305{
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c,
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}
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return &ret, nil
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}
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func (c *C20P1305) encrypt(plaintext []byte, nonce []byte) ([]byte, error) {
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ciphertext := c.cipher.Seal(nil, nonce, plaintext, nil)
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return ciphertext, nil
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}
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func (c *C20P1305) decrypt(ciphertext []byte, nonce []byte) ([]byte, error) {
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plain, err := c.cipher.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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return plain, nil
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}
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