1 /*
2 * Copyright (c) 2023-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "pkcs7_generator.h"
17
18 #include "errcode.h"
19 #include "log.h"
20 #include "openssl_utils.h"
21 #include "pkcs7_data.h"
22 #include "securec.h"
23
24 namespace OHOS {
25 namespace Security {
26 namespace CodeSign {
GenerateSignature(const std::string & ownerID,SignKey & key,const char * hashAlg,const ByteBuffer & contentData,ByteBuffer & out)27 int32_t PKCS7Generator::GenerateSignature(const std::string &ownerID, SignKey &key, const char *hashAlg,
28 const ByteBuffer &contentData, ByteBuffer &out)
29 {
30 LOG_INFO("GenerateSignature called.");
31 int32_t ret = CS_ERR_OPENSSL_PKCS7;
32 X509 *cert = nullptr;
33 do {
34 const ByteBuffer *certBuffer = key.GetSignCert();
35 if (certBuffer == nullptr) {
36 ret = CS_ERR_HUKS_OBTAIN_CERT;
37 break;
38 }
39 cert = LoadCertFromBuffer(certBuffer->GetBuffer(), certBuffer->GetSize());
40 if (cert == nullptr) {
41 ret = CS_ERR_OPENSSL_LOAD_CERT;
42 break;
43 }
44 const EVP_MD *md = EVP_get_digestbyname(hashAlg);
45 if (md == nullptr) {
46 break;
47 }
48 PKCS7Data pkcs7(md, cert);
49 if (!pkcs7.InitPKCS7Data(key.GetCarriedCerts())) {
50 break;
51 }
52 SignerInfo signerInfo;
53 if (!signerInfo.InitSignerInfo(ownerID, cert, md, contentData)) {
54 break;
55 }
56 if (!pkcs7.AddSignerInfo(signerInfo.GetSignerInfo())) {
57 break;
58 }
59 ret = SignData(key, signerInfo);
60 if (ret != CS_SUCCESS) {
61 break;
62 }
63 if (!pkcs7.GetPKCS7Data(out)) {
64 ret = CS_ERR_OPENSSL_PKCS7;
65 break;
66 }
67 ret = CS_SUCCESS;
68 } while (0);
69 X509_free(cert);
70 if (ret != CS_SUCCESS) {
71 LOG_ERROR("Generate signature failed, ret = %{public}d", ret);
72 }
73 return ret;
74 }
75
SignData(SignKey & key,SignerInfo & signerInfo)76 int32_t PKCS7Generator::SignData(SignKey &key, SignerInfo &signerInfo)
77 {
78 uint32_t dataSize = 0;
79 uint8_t *data = signerInfo.GetDataToSign(dataSize);
80 if (data == nullptr) {
81 LOG_ERROR("GetDataToSign fail");
82 return CS_ERR_OPENSSL_PKCS7;
83 }
84 ByteBuffer unsignedData;
85 if (!unsignedData.CopyFrom(data, dataSize)) {
86 return CS_ERR_MEMORY;
87 }
88 ByteBuffer rawSignature;
89 if (!key.Sign(unsignedData, rawSignature)) {
90 return CS_ERR_HUKS_SIGN;
91 }
92 if (!signerInfo.AddSignatureInSignerInfo(rawSignature)) {
93 LOG_ERROR("AddSignatureInSignerInfo fail");
94 return CS_ERR_OPENSSL_PKCS7;
95 }
96 return CS_SUCCESS;
97 }
98 }
99 }
100 }