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OSS客戶端加密是在數(shù)據(jù)上傳至OSS之前，由用戶在本地對(duì)數(shù)據(jù)進(jìn)行加密處理，確保只有密鑰持有者才能解密數(shù)據(jù)，增強(qiáng)數(shù)據(jù)在傳輸和存儲(chǔ)過程中的安全性。

免責(zé)聲明

使用客戶端加密功能時(shí)，您需要對(duì)主密鑰的完整性和正確性負(fù)責(zé)。因您維護(hù)不當(dāng)導(dǎo)致主密鑰用錯(cuò)或丟失，從而導(dǎo)致加密數(shù)據(jù)無法解密所引起的一切損失和后果均由您自行承擔(dān)。
在對(duì)加密數(shù)據(jù)進(jìn)行復(fù)制或者遷移時(shí)，您需要對(duì)加密元數(shù)據(jù)的完整性和正確性負(fù)責(zé)。因您維護(hù)不當(dāng)導(dǎo)致加密元數(shù)據(jù)出錯(cuò)或丟失，從而導(dǎo)致加密數(shù)據(jù)無法解密所引起的一切損失和后果均由您自行承擔(dān)。

使用場景

高度敏感數(shù)據(jù)：對(duì)于包含極高敏感度信息的數(shù)據(jù)，如個(gè)人身份信息（PII）、金融交易記錄、醫(yī)療健康數(shù)據(jù)等，用戶可能希望在數(shù)據(jù)離開本地環(huán)境之前就對(duì)其進(jìn)行加密處理，確保即使數(shù)據(jù)在傳輸過程中被截獲，原始數(shù)據(jù)仍能得到有效保護(hù)。
合規(guī)要求：某些行業(yè)和法規(guī)（例如HIPAA、GDPR等）要求對(duì)存儲(chǔ)在第三方平臺(tái)上的數(shù)據(jù)進(jìn)行嚴(yán)格的加密控制，客戶端加密能夠滿足這些合規(guī)性要求，因?yàn)槊荑€由用戶自己管理，不通過網(wǎng)絡(luò)傳遞，也不由云服務(wù)商直接掌握。
更強(qiáng)的自主控制權(quán)：企業(yè)或者開發(fā)者可能希望對(duì)加密過程有完全的控制權(quán)，包括選擇加密算法、管理和輪換密鑰。通過客戶端加密，可以實(shí)現(xiàn)這一目標(biāo)，確保只有合法授權(quán)的用戶才能解密和訪問數(shù)據(jù)。
跨區(qū)域數(shù)據(jù)遷移安全性：在將數(shù)據(jù)從一個(gè)地區(qū)遷移到另一個(gè)地區(qū)的過程中，使用客戶端加密可以在數(shù)據(jù)遷移前后保持?jǐn)?shù)據(jù)始終處于加密狀態(tài)，增強(qiáng)了數(shù)據(jù)在公網(wǎng)傳輸?shù)陌踩浴?/p>

注意事項(xiàng)

本文以華東1（杭州）外網(wǎng)Endpoint為例。如果您希望通過與OSS同地域的其他阿里云產(chǎn)品訪問OSS，請(qǐng)使用內(nèi)網(wǎng)Endpoint。關(guān)于OSS支持的Region與Endpoint的對(duì)應(yīng)關(guān)系，請(qǐng)參見OSS地域和訪問域名。
本文以OSS域名新建OSSClient為例。如果您希望通過自定義域名、STS等方式新建OSSClient，請(qǐng)參見新建OssClient。

背景信息

使用客戶端加密時(shí)，會(huì)為每個(gè)Object生成一個(gè)隨機(jī)數(shù)據(jù)加密密鑰，用該隨機(jī)數(shù)據(jù)加密密鑰明文對(duì)Object的數(shù)據(jù)進(jìn)行對(duì)稱加密。主密鑰用于生成隨機(jī)的數(shù)據(jù)加密密鑰，加密后的內(nèi)容會(huì)作為Object的meta信息保存在服務(wù)端。解密時(shí)先用主密鑰將加密后的隨機(jī)密鑰解密出來，再用解密出來的隨機(jī)數(shù)據(jù)加密密鑰明文解密Object的數(shù)據(jù)。主密鑰只參與客戶端本地計(jì)算，不會(huì)在網(wǎng)絡(luò)上進(jìn)行傳輸或保存在服務(wù)端，以保證主密鑰的數(shù)據(jù)安全。

重要

客戶端加密支持分片上傳超過5 GB的文件。在使用分片方式上傳文件時(shí)，需要指定上傳文件的總大小和分片大小，除了最后一個(gè)分片外，每個(gè)分片的大小要一致，且分片大小目前必須是16的整數(shù)倍。
調(diào)用客戶端加密上傳文件后，加密元數(shù)據(jù)會(huì)被保護(hù)，無法通過CopyObject修改Object meta信息。

加密方式

對(duì)于主密鑰的使用，目前支持如下兩種方式：

使用KMS托管用戶主密鑰
當(dāng)使用KMS托管用戶主密鑰用于客戶端數(shù)據(jù)加密時(shí)，需要將KMS用戶主密鑰ID（即CMK ID）傳遞給SDK。
使用用戶自主管理的主密鑰（RSA）
主密鑰信息由用戶提供，需要用戶將主密鑰的公鑰、私鑰信息作為參數(shù)傳遞給SDK。

使用以上兩種加密方式能夠有效地避免數(shù)據(jù)泄漏，保護(hù)客戶端數(shù)據(jù)安全。即使數(shù)據(jù)泄漏，其他人也無法解密得到原始數(shù)據(jù)。

加密元數(shù)據(jù)

參數(shù)	描述	是否必需
x-oss-meta-client-side-encryption-key	加密后的密鑰。經(jīng)過主密鑰加密后再經(jīng)過base64編碼的字符串。	是
x-oss-meta-client-side-encryption-start	隨機(jī)產(chǎn)生的加密數(shù)據(jù)的初始值。經(jīng)過主密鑰加密后再經(jīng)過base64編碼的字符串。	是
x-oss-meta-client-side-encryption-cek-alg	數(shù)據(jù)的加密算法。	是
x-oss-meta-client-side-encryption-wrap-alg	數(shù)據(jù)密鑰的加密算法。	是
x-oss-meta-client-side-encryption-matdesc	主密鑰的描述信息。JSON格式。警告強(qiáng)烈建議為每個(gè)主密鑰都配置描述信息，并保存好主密鑰和描述信息之間的對(duì)應(yīng)關(guān)系。否則不支持更換主密鑰進(jìn)行加密。	否
x-oss-meta-client-side-encryption-unencrypted-content-length	加密前的數(shù)據(jù)長度。如未指定content-length則不生成該參數(shù)。	否
x-oss-meta-client-side-encryption-unencrypted-content-md5	加密前數(shù)據(jù)的MD5。如未指定MD5，則不生成該參數(shù)。	否
x-oss-meta-client-side-encryption-data-size	若加密Multipart文件需要在init_multipart時(shí)傳入整個(gè)大文件的總大小。	是（分片上傳）
x-oss-meta-client-side-encryption-part-size	若加密Multipart文件需要在init_multipart時(shí)傳入分片大小。說明目前分片大小必須是16的整數(shù)倍。	是（分片上傳）

以下提供了如何使用用戶自主管理的主密鑰（RSA）方式從內(nèi)存中上傳文件、上傳本地文件、斷點(diǎn)續(xù)傳上傳、分片上傳、下載到本地文件等場景的完整示例代碼。

從內(nèi)存中上傳文件

以下代碼用于使用主密鑰RSA加密內(nèi)存中上傳的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
    
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);
    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);
    std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
    *content << "Thank you for using Aliyun Object Storage Service!";
    PutObjectRequest request(BucketName, ObjectName, content);
    /* 上傳文件。*/
    auto outcome = client.PutObject(request);
    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "PutObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

上傳本地文件

以下代碼用于使用主密鑰RSA加密本地上傳的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
    
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);
    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);
    /* 上傳文件。*/
    auto outcome = client.PutObject(BucketName, ObjectName, "yourLocalFilename");
    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "PutObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

斷點(diǎn)續(xù)傳上傳

以下代碼用于使用主密鑰RSA加密斷點(diǎn)續(xù)傳上傳的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object的完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";
    /* 填寫本地文件的完整路徑，例如D:\\localpath\\examplefile.txt。如果未指定本地路徑，則默認(rèn)從示例程序所屬項(xiàng)目對(duì)應(yīng)本地路徑中上傳文件。*/
    std::string UploadFilePath = "D:\\localpath\\examplefile.txt";
    /* 記錄本地分片上傳結(jié)果的文件。上傳過程中的進(jìn)度信息會(huì)保存在該文件中，如果某一分片上傳失敗，再次上傳時(shí)會(huì)根據(jù)文件中記錄的點(diǎn)繼續(xù)上傳。上傳完成后，該文件會(huì)被刪除。*/
    /* 如果未設(shè)置該值，默認(rèn)與待上傳的本地文件同路徑。*/
    std::string CheckpointFilePath = "yourCheckpointFilepath"

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk(); 
  
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);
    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);

    /* 斷點(diǎn)續(xù)傳上傳。*/
    UploadObjectRequest request(BucketName, ObjectName, UploadFilePath, CheckpointFilePath);
    auto outcome = client.ResumableUploadObject(request);

    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "ResumableUploadObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

分片上傳

以下代碼用于使用主密鑰RSA加密分片上傳的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
#include <fstream>
using namespace AlibabaCloud::OSS;

static int64_t getFileSize(const std::string& file)
{
    std::fstream f(file, std::ios::in | std::ios::binary);
    f.seekg(0, f.end);
    int64_t size = f.tellg();
    f.close();
    return size;
}

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object的完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";
    std::string fileToUpload = "yourLocalFilename";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
    
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);
    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);

    /* 初始化分片加密上下文。*/
    /* 需要16字節(jié)對(duì)齊。*/
    int64_t partSize = 100 * 1024;
    auto fileSize = getFileSize(fileToUpload);
    MultipartUploadCryptoContext cryptoCtx;
    cryptoCtx.setPartSize(partSize);
    cryptoCtx.setDataSize(fileSize);

    /* 初始化分片上傳事件。*/
    InitiateMultipartUploadRequest initUploadRequest(BucketName, ObjectName);
    auto uploadIdResult = client.InitiateMultipartUpload(initUploadRequest, cryptoCtx);
    auto uploadId = uploadIdResult.result().UploadId();
    PartList partETagList;
    int partCount = static_cast<int> (fileSize / partSize);
    /* 計(jì)算分片個(gè)數(shù)。*/
    if (fileSize % partSize != 0)  {
        partCount++;
    }
    /* 對(duì)每一個(gè)分片進(jìn)行上傳。*/
    for (int i = 1; i <= partCount; i++) {
        auto skipBytes = partSize * (i - 1);
        auto size = (partSize < fileSize - skipBytes) ? partSize : (fileSize - skipBytes);
        std::shared_ptr<std::iostream> content = std::make_shared<std::fstream>(fileToUpload, std::ios::in|std::ios::binary);
        content->seekg(skipBytes, std::ios::beg);
        UploadPartRequest uploadPartRequest(BucketName, ObjectName, content);
        uploadPartRequest.setContentLength(size);
        uploadPartRequest.setUploadId(uploadId);
        uploadPartRequest.setPartNumber(i);
        auto uploadPartOutcome = client.UploadPart(uploadPartRequest, cryptoCtx);
        if (uploadPartOutcome.isSuccess()) {
            Part part(i, uploadPartOutcome.result().ETag());
            partETagList.push_back(part);
        }
        else {
            std::cout << "uploadPart fail" <<
            ",code:" << uploadPartOutcome.error().Code() <<
            ",message:" << uploadPartOutcome.error().Message() <<
            ",requestId:" << uploadPartOutcome.error().RequestId() << std::endl;
        }
    }
    /* 完成分片上傳。*/
    CompleteMultipartUploadRequest request(BucketName, ObjectName);
    request.setUploadId(uploadId);
    request.setPartList(partETagList);
    auto outcome = client.CompleteMultipartUpload(request, cryptoCtx);
    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "CompleteMultipartUpload fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

下載到本地文件

以下代碼用于使用主密鑰RSA解密下載到本地的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
#include <fstream>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";
    /* 下載Object到本地文件examplefile.txt，并保存到指定的本地路徑中（D:\\localpath）。如果指定的本地文件存在會(huì)覆蓋，不存在則新建。*/
    /* 如果未指定本地路徑，則下載后的文件默認(rèn)保存到示例程序所屬項(xiàng)目對(duì)應(yīng)本地路徑中。*/
    std::string FileNametoSave = "D:\\localpath\\examplefile.txt";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
  
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);

    /* 如果需要解密不同主密鑰加密的內(nèi)容, 需要傳對(duì)應(yīng)的密鑰信息。*/
    //std::string RSAPublicKey2 =  "your rsa public key";
    //std::string RSAPrivateKey2 = "your rsa private key";
    //std::map<std::string, std::string> desc2;
    //desc2["comment"] = "your comment";
    //materials.addEncryptionMaterial(RSAPublicKey2, RSAPrivateKey2, desc2);

    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);

    /* 獲取文件到本地文件。*/
    GetObjectRequest request(BucketName, ObjectName);
    request.setResponseStreamFactory([=]() {return std::make_shared<std::fstream>(FileNametoSave, std::ios_base::out | std::ios_base::in | std::ios_base::trunc| std::ios_base::binary); });
    auto outcome = client.GetObject(request);
    if (outcome.isSuccess()) {    
        std::cout << "GetObjectToFile success" << outcome.result().Metadata().ContentLength() << std::endl;
    }
    else {
        /* 異常處理。*/
        std::cout << "GetObjectToFile fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

下載到本地內(nèi)存

以下代碼用于使用主密鑰RSA解密下載到本地內(nèi)存的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫不包含Bucket名稱在內(nèi)的Object的完整路徑，例如desrfolder/exampleobject.txt。*/
    std::string ObjectName = "yourObjectName";
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
    
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);

    /* 如果需要解密不同主密鑰加密的內(nèi)容, 需要傳對(duì)應(yīng)的密鑰信息。*/
    //std::string RSAPublicKey2 =  "your rsa public key";
    //std::string RSAPrivateKey2 = "your rsa private key";
    //std::map<std::string, std::string> desc2;
    //desc2["comment"] = "your comment";
    //materials.addEncryptionMaterial(RSAPublicKey2, RSAPrivateKey2, desc2);

    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);

    /* 獲取文件到本地內(nèi)存。*/
    GetObjectRequest request(BucketName, ObjectName);
    auto outcome = client.GetObject(request);
    if (outcome.isSuccess()) {    
      std::cout << "getObjectToBuffer" << " success, Content-Length:" << outcome.result().Metadata().ContentLength() << std::endl;
        /* 打印下載內(nèi)容。*/
        std::string content;
        *(outcome.result().Content()) >> content;
        std::cout << "getObjectToBuffer" << "content:" << content << std::endl; 
    }
    else {
        /* 異常處理。*/
        std::cout << "getObjectToBuffer fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /*釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

范圍下載

以下代碼用于使用主密鑰RSA解密范圍下載的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息。*/
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫不包含Bucket名稱在內(nèi)的Object的完整路徑，例如desrfolder/exampleobject.txt。*/
    std::string ObjectName = "yourObjectName";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
    
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);

    /* 如果需要解密不同主密鑰加密的內(nèi)容, 需要傳對(duì)應(yīng)的密鑰信息。*/
    //std::string RSAPublicKey2 =  "your rsa public key";
    //std::string RSAPrivateKey2 = "your rsa private key";
    //std::map<std::string, std::string> desc2;
    //desc2["comment"] = "your comment";
    //materials.addEncryptionMaterial(RSAPublicKey2, RSAPrivateKey2, desc2);

    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);

    /* 設(shè)置下載范圍。*/
    GetObjectRequest request(BucketName,  ObjectName);
    request.setRange(0, 1);
    auto outcome = client.GetObject(request);
    if (!outcome.isSuccess ()) {    
        /* 異常處理。*/
        std::cout << "getObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
         return -1;  
    }

    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

斷點(diǎn)續(xù)傳下載

以下代碼用于使用主密鑰RSA解密斷點(diǎn)續(xù)傳下載的文件：

#include <alibabacloud/oss/OssEncryptionClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號(hào)信息 */
    
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)?yīng)的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫B(tài)ucket所在地域?qū)?yīng)的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";
    /* 下載Object到本地文件examplefile.txt，并保存到指定的本地路徑中（D:\\localpath）。如果指定的本地文件存在會(huì)覆蓋，不存在則新建。*/
    /* 如果未指定本地路徑，則下載后的文件默認(rèn)保存到示例程序所屬項(xiàng)目對(duì)應(yīng)本地路徑中。*/
    std::string DownloadFilePath = "D:\\localpath\\examplefile.txt";
    /* 設(shè)置斷點(diǎn)記錄文件的完整路徑，例如D:\\localpath\\examplefile.txt.dcp。*/
    /* 只有當(dāng)Object下載中斷產(chǎn)生了斷點(diǎn)記錄文件后，如果需要繼續(xù)下載該Object，才需要設(shè)置對(duì)應(yīng)的斷點(diǎn)記錄文件。下載完成后，該文件會(huì)被刪除。*/
    std::string CheckpointFilePath = "D:\\localpath\\examplefile.txt.dcp";

    /* 主密鑰及描述信息。*/
    std::string RSAPublicKey = "your rsa public key";
    std::string RSAPrivateKey = "your rsa private key";
    std::map<std::string, std::string> desc;
    desc["comment"] = "your comment";

    /* 初始化網(wǎng)絡(luò)等資源。*/
    InitializeSdk();
  
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運(yùn)行本代碼示例之前，請(qǐng)確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
    CryptoConfiguration cryptoConf;
    auto materials = std::make_shared<SimpleRSAEncryptionMaterials>(RSAPublicKey, RSAPrivateKey, desc);

    /* 如果需要解密不同主密鑰加密的內(nèi)容, 需要傳對(duì)應(yīng)的密鑰信息。*/
    //std::string RSAPublicKey2 =  "your rsa public key";
    //std::string RSAPrivateKey2 = "your rsa private key";
    //std::map<std::string, std::string> desc2;
    //desc2["comment"] = "your comment";
    //materials.addEncryptionMaterial(RSAPublicKey2, RSAPrivateKey2, desc2);

    OssEncryptionClient client(Endpoint, credentialsProvider, conf, materials, cryptoConf);

    /* 斷點(diǎn)續(xù)傳下載。*/
    DownloadObjectRequest request(BucketName, ObjectName, DownloadFilePath, CheckpointFilePath);
    auto outcome = client.ResumableDownloadObject(request);

    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "ResumableDownloadObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
    /* 釋放網(wǎng)絡(luò)等資源。*/
    ShutdownSdk();
    return 0;
}

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