37 lines
779 B
Go
37 lines
779 B
Go
package main
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import (
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"crypto/rand"
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"fmt"
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"golang.org/x/crypto/chacha20poly1305"
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)
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func EncryptSym(key []byte, plaintext []byte) ([]byte, error) {
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aead, err := chacha20poly1305.NewX(key)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, chacha20poly1305.NonceSizeX)
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if _, err := rand.Read(nonce); err != nil {
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return nil, err
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}
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return aead.Seal(nonce, nonce, plaintext, nil), nil
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}
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func DecryptSym(key []byte, ciphertext []byte) ([]byte, error) {
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aead, err := chacha20poly1305.NewX(key)
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if err != nil {
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return nil, err
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}
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if len(ciphertext) < aead.NonceSize() {
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return nil, fmt.Errorf("ciphertext too short")
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}
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nonce, ciphertext := ciphertext[:aead.NonceSize()], ciphertext[aead.NonceSize():]
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return aead.Open(nil, nonce, ciphertext, nil)
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}
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