//go:build amd64 || arm64
// +build amd64 arm64

package sm4

import "crypto/cipher"

/*TODO use aesni to improve performance */

type sm4CipherGCM struct {
	sm4CipherAsm
}

// NewGCM returns the SM4 cipher wrapped in Galois Counter Mode. This is only
// called by crypto/cipher.NewGCM via the gcmAble interface.
//
// 调用crypto/cipher.NewGCM的时候在回调sm4CipherGCM.NewGCM
func (c *sm4CipherGCM) NewGCM(nonceSize, tagSize int) (cipher.AEAD, error) {
	// TODO 判断size，先返回错误

	// 现在是默认实现-sm4CipherAsm没有gcmAble接口
	return cipher.NewGCM(&c.sm4CipherAsm)
}