47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
package common
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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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"fmt"
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)
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func DecryptAESGCM(data, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, fmt.Errorf("failed to create cipher: %v", err)
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, fmt.Errorf("failed to create gcm: %v", err)
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}
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nonceSize := gcm.NonceSize()
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if len(data) < nonceSize {
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return nil, fmt.Errorf("data is too short")
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}
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nonce, data := data[:nonceSize], data[nonceSize:]
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out, err := gcm.Open(nil, nonce, data, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to decrypt: %v", err)
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}
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return out, nil
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}
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func EncryptAESGCM(plaintext, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, fmt.Errorf("failed to create cipher: %v", err)
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, fmt.Errorf("failed to create gcm: %v", err)
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err = rand.Read(nonce); err != nil {
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return nil, fmt.Errorf("failed to read random data: %v", err)
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}
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out := gcm.Seal(nil, nonce, plaintext, nil)
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return append(nonce, out...), nil
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}
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