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sm3_signer.go
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sm3_signer.go
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// Copyright 2023 Huawei Technologies Co.,Ltd.
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package signer
import (
"encoding/hex"
"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/request"
)
const (
sdkHmacSm3 = "SDK-HMAC-SM3"
xSdkContentSm3 = "X-Sdk-Content-Sm3"
)
type SM3Signer struct {
}
func (s SM3Signer) Sign(req *request.DefaultHttpRequest, ak, sk string) (map[string]string, error) {
err := checkAKSK(ak, sk)
if err != nil {
return nil, err
}
processContentHeader(req, xSdkContentSm3)
originalHeaders := req.GetHeaderParams()
t := extractTime(originalHeaders)
headerDate := t.UTC().Format(BasicDateFormat)
originalHeaders[HeaderXDate] = headerDate
additionalHeaders := map[string]string{HeaderXDate: headerDate}
signedHeaders := extractSignedHeaders(originalHeaders)
cr, err := canonicalRequest(req, signedHeaders, xSdkContentSm3, sm3HasherInst)
if err != nil {
return nil, err
}
sts, err := stringToSign(sdkHmacSm3, cr, t, sm3HasherInst)
if err != nil {
return nil, err
}
sig, err := s.signStringToSign(sts, []byte(sk))
if err != nil {
return nil, err
}
additionalHeaders[HeaderAuthorization] = authHeaderValue(sdkHmacSm3, sig, ak, signedHeaders)
return additionalHeaders, nil
}
func (s SM3Signer) signStringToSign(stringToSign string, signingKey []byte) (string, error) {
hmac, err := sm3HasherInst.hmac([]byte(stringToSign), signingKey)
if err != nil {
return "", err
}
return hex.EncodeToString(hmac), nil
}