61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package crypt
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import (
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"crypto/cipher"
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"crypto/rand"
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"log"
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"golang.org/x/crypto/chacha20poly1305"
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)
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type Crypt struct {
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key []byte
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ads []byte
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aead cipher.AEAD
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}
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func NewChacha20poly1305Key() []byte {
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k := make([]byte, chacha20poly1305.KeySize)
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if _, err := rand.Read(k); err != nil {
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panic(err)
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}
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return k
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}
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func NewCrypt(key []byte, ads []byte) *Crypt {
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if len(key) == 0 {
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// log.Printf(" == GENERATE NEW KEY ==\n")
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key = NewChacha20poly1305Key()
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}
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aead, err := chacha20poly1305.New(key)
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if err != nil {
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panic(err)
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}
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return &Crypt{key: key, ads: ads, aead: aead}
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}
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func (c *Crypt) GenNonce(length int) []byte {
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nonce := make([]byte, c.aead.NonceSize(), c.aead.NonceSize()+length+c.aead.Overhead())
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if _, err := rand.Read(nonce); err != nil {
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panic(err)
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}
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return nonce
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}
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func (c *Crypt) Encrypt(msg []byte) []byte {
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nonce := c.GenNonce(len(msg))
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encryptedMsg := c.aead.Seal(nonce, nonce, msg, c.ads)
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return encryptedMsg
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}
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func (c *Crypt) Decrypt(encrypted []byte) ([]byte, bool) {
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done := true
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nonce, ciphertext := encrypted[:c.aead.NonceSize()], encrypted[c.aead.NonceSize():]
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plaintext, err := c.aead.Open(nil, nonce, ciphertext, c.ads)
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if err != nil {
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done = false
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log.Printf(" error decrypt data : %v\n", err)
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}
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return plaintext, done
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}
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