mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
121 lines
4.0 KiB
Go
121 lines
4.0 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"bytes"
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"crypto/cipher"
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"crypto/ecdsa"
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"crypto/rand"
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"fmt"
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"github.com/emmansun/gmsm/padding"
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"github.com/emmansun/gmsm/sm2"
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"github.com/emmansun/gmsm/sm3"
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"github.com/emmansun/gmsm/sm4"
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"github.com/emmansun/gmsm/smx509"
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)
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// GMCryptoProvider 使用纯Go国密实现，可在原生环境和WASM使用
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type GMCryptoProvider struct{}
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// EncryptSM4 使用SM4-CBC及PKCS#7填充加密
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// 入参: key 密钥, iv 初始向量, plaintext 明文
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// 返回: []byte 密文, error 错误信息
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func (GMCryptoProvider) EncryptSM4(key, iv, plaintext []byte) ([]byte, error) {
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block, err := sm4.NewCipher(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(iv) != block.BlockSize() {
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return nil, fmt.Errorf("invalid SM4 IV length")
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}
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out := padding.NewPKCS7Padding(sm4.BlockSize).Pad(bytes.Clone(plaintext))
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cipher.NewCBCEncrypter(block, iv).CryptBlocks(out, out)
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return out, nil
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}
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// DecryptSM4 解密SM4-CBC并校验PKCS#7填充
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// 入参: key 密钥, iv 初始向量, ciphertext 密文
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// 返回: []byte 明文, error 错误信息
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func (GMCryptoProvider) DecryptSM4(key, iv, ciphertext []byte) ([]byte, error) {
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block, err := sm4.NewCipher(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(iv) != block.BlockSize() || len(ciphertext) == 0 || len(ciphertext)%block.BlockSize() != 0 {
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return nil, ErrInvalidCredentials
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}
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out := make([]byte, len(ciphertext))
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cipher.NewCBCDecrypter(block, iv).CryptBlocks(out, ciphertext)
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plain, err := padding.NewPKCS7Padding(sm4.BlockSize).ConstantTimeUnpad(out)
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if err != nil {
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clear(out)
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return nil, ErrInvalidCredentials
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}
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return plain, nil
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}
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// PasswordKey 按GB/T32918派生16字节口令密钥
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// 入参: password UTF-8口令
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// 返回: []byte 密钥, error 错误信息
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func (GMCryptoProvider) PasswordKey(password []byte) ([]byte, error) {
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if len(password) == 0 {
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return nil, ErrCredentialsRequired
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}
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return sm3.Kdf(password, sm4.BlockSize), nil
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}
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// EncryptKey 使用SM2公钥证书封装文件密钥
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// 入参: certificate DER证书, key 文件密钥
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// 返回: []byte ASN.1密文, error 错误信息
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func (GMCryptoProvider) EncryptKey(certificate, key []byte) ([]byte, error) {
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cert, err := parseEncryptionCertificate(certificate)
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if err != nil {
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return nil, err
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}
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return sm2.EncryptASN1(rand.Reader, cert.PublicKey.(*ecdsa.PublicKey), key)
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}
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// ParseEncryptionCertificate 解析单张SM2加密证书并返回DER副本
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// 仅检查格式、算法和密钥用途，接收者身份及信任应由调用方确认
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// 入参: certificate PEM或DER证书
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// 返回: []byte DER证书, error 错误信息
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func ParseEncryptionCertificate(certificate []byte) ([]byte, error) {
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cert, err := parseEncryptionCertificate(certificate)
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if err != nil {
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return nil, err
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}
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return bytes.Clone(cert.Raw), nil
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}
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// parseEncryptionCertificate 解析并检查加密证书
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// 入参: certificate PEM或DER证书
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// 返回: *smx509.Certificate 证书, error 错误信息
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func parseEncryptionCertificate(certificate []byte) (*smx509.Certificate, error) {
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cert, err := parseSignatureCertificate(certificate)
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if err != nil {
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return nil, err
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}
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public, ok := cert.PublicKey.(*ecdsa.PublicKey)
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if !ok || !sm2.IsSM2PublicKey(public) {
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return nil, fmt.Errorf("SM2 encryption certificate required")
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}
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if cert.KeyUsage != 0 && cert.KeyUsage&(smx509.KeyUsageKeyEncipherment|smx509.KeyUsageDataEncipherment|smx509.KeyUsageKeyAgreement) == 0 {
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return nil, fmt.Errorf("certificate does not permit encryption")
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}
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return cert, nil
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}
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