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- What's New
- Function Overview
- Service Overview
- Billing
- Getting Started
-
User Guide
- Key Management Service
- Cloud Secret Management Service
- Key Pair Service
- Dedicated HSM
- Tag Management
- Auditing Logs
- Activating a Dedicated HSM Instance Using a Shared VPC
- Updating a Resource Share
- Leaving a Resource Share
- Permission Control
-
Best Practices
- Key Management Service
- Cloud Secret Management Service
- General
-
API Reference
- Before You Start
- Calling APIs
- API Overview
-
APIs
-
Key Management APIs
- Key Lifecycle Management
- DEK Management
- Small-Size Data Encryption and Decryption
- Signature and Verification
- Key Tag Management
- Key API Version Query
- Querying Key API Versions
- Key Import Management
- Querying Keys
- Key Grant Management
- Key Rotation Management
- Dedicated Keystore Management
- Signature Verification
- Key Pair Management APIs
- Secret Management APIs
-
Key Management APIs
- Historical APIs
- Application Examples
- Permissions Policies and Supported Actions
- Appendix
- SDK Reference
-
FAQs
-
KMS Related
- What Is Key Management Service?
- What Is a Customer Master Key?
- What Is a Default Key?
- What Are the Differences Between a Custom Key and a Default Key?
- What Is a Data Encryption Key?
- Why Cannot I Delete a CMK Immediately?
- Which Cloud Services Can Use KMS for Encryption?
- How Do Huawei Cloud Services Use KMS to Encrypt Data?
- What Are the Benefits of Envelope Encryption?
- Is There a Limit on the Number of Custom Keys That I Can Create on KMS?
- Can I Export a CMK from KMS?
- Can I Decrypt My Data if I Permanently Delete My Custom Key?
- How Do I Use the Online Tool to Encrypt or Decrypt Small Volumes of Data?
- Can I Update CMKs Created by KMS-Generated Key Materials?
- When Should I Use a CMK Created with Imported Key Materials?
- What Should I Do When I Accidentally Delete Key Materials?
- How Are Default Keys Generated?
- What Should I Do If I Do Not Have the Permissions to Perform Operations on KMS?
- Why Can't I Wrap Asymmetric Keys by Using -id-aes256-wrap-pad in OpenSSL?
- Key Algorithms Supported by KMS
- What Should I Do If KMS Failed to Be Requested and Error Code 401 Is Displayed?
- What Is the Relationship Between the Ciphertext and Plaintext Returned by the encrypt-data API?
- CSMS Related
-
KPS Related
- How Do I Create a Key Pair?
- What Are a Private Key Pair and an Account Key Pair?
- How Do I Handle an Import Failure of a Key Pair Created Using PuTTYgen?
- What Should I Do When I Fail to Import a Key Pair Using Internet Explorer 9?
- How Do I Log In to a Linux ECS with a Private Key?
- How Do I Use a Private Key to Obtain the Password to Log In to a Windows ECS?
- How Do I Handle the Failure in Binding a Key Pair?
- How Do I Handle the Failure in Replacing a Key Pair?
- How Do I Handle the Failure in Resetting a Key Pair?
- How Do I Handle the Failure in Unbinding a Key Pair?
- Do I Need to Restart Servers After Replacing Its Key Pair?
- How Do I Enable the Password Login Mode for an ECS?
- How Do I Handle the Failure in Logging In to ECS After Unbinding the Key Pair?
- What Should I Do If My Private Key Is Lost?
- How Do I Convert the Format of a Private Key File?
- Can I Change the Key Pair of a Server?
- Can a Key Pair Be Shared by Multiple Users?
- How Do I Obtain the Public or Private Key File of a Key Pair?
- What Can I Do If an Error Is Reported When an Account Key Is Created or Upgraded for the First Time?
- Will the Account Key Pair Quota Be Occupied After a Private Key Pair Is Upgraded to an Account Key Pair?
-
Dedicated HSM Related
- What Is Dedicated HSM?
- How Does Dedicated HSM Ensure the Security for Key Generation?
- Do Equipment Room Personnel Has the Super Administrator Role to Steal Information by Using a Privileged UKey?
- What HSMs Are Used for Dedicated HSM?
- What APIs Does Dedicated HSM Support?
- How Do I Enable Public Access to a Dedicated HSM Instance?
- Pricing
- General
- Change History
-
KMS Related
- Videos
-
More Documents
- User Guide (ME-Abu Dhabi Region)
- User Guide (Paris and Amsterdam Regions)
-
User Guide (Kuala Lumpur Region)
- Service Overview
-
User Guide
- Key Management Service
- Cloud Secret Management Service
- Auditing Logs
- Permission Control
-
FAQs
-
KMS Related
- What Is Key Management Service?
- What Is a Customer Master Key?
- What Is a Default Key?
- What Are the Differences Between a Custom Key and a Default Key?
- What Is a Data Encryption Key?
- Why Cannot I Delete a CMK Immediately?
- Which Cloud Services Can Use KMS for Encryption?
- How Do Cloud Services Use KMS to Encrypt Data?
- What Are the Benefits of Envelope Encryption?
- Is There a Limit on the Number of Custom Keys That I Can Create on KMS?
- Can I Export a CMK from KMS?
- Can I Decrypt My Data if I Permanently Delete My Custom Key?
- How Do I Use the Online Tool to Encrypt or Decrypt Small Volumes of Data?
- Can I Update CMKs Created by KMS-Generated Key Materials?
- When Should I Use a CMK Created with Imported Key Materials?
- What Types of Keys Can I Import?
- What Should I Do When I Accidentally Delete Key Materials?
- How Are Default Keys Generated?
- What Should I Do If I Do Not Have the Permissions to Perform Operations on KMS?
- Why Can't I Wrap Asymmetric Keys by Using -id-aes256-wrap-pad in OpenSSL?
- Key Algorithms Supported by KMS
- What Should I Do If KMS Failed to Be Requested and Error Code 401 Is Displayed?
- What Is the Relationship Between the Ciphertext and Plaintext Returned by the encrypt-data API?
- How Does KMS Protect My Keys?
- Credential Related
-
KMS Related
- Change History
-
API Reference (ME-Abu Dhabi Region)
- Before You Start
- Calling APIs
- API Overview
-
APIs
- Creating a CMK
- Enabling a CMK
- Disabling a CMK
- Scheduling the Deletion of a CMK
- Canceling the Scheduled Deletion of a CMK
- Querying the List of CMKs
- Querying the Information About a CMK
- Creating a Random Number
- Creating a DEK
- Creating a Plaintext-Free DEK
- Encrypting a DEK
- Decrypting a DEK
- Querying the Number of Instances
- Querying the Quota of a User
- Changing the Alias of a CMK
- Changing the Description of a CMK
- Encrypting Data
- Decrypting Data
- Obtaining CMK Import Parameters
- Importing CMK Material
- Deleting CMK Material
- Querying CMK Instances
- Querying CMK Tags
- Querying Project Tags
- Adding or Deleting CMK Tags in Batches
- Adding a CMK Tag
- Deleting a CMK Tag
- Permissions Policies and Supported Actions
- Appendix
- Change History
-
API Reference (Paris and Amsterdam Regions)
- Before You Start
- Calling APIs
- API Overview
-
APIs
- Creating a CMK
- Enabling a CMK
- Disabling a CMK
- Scheduling the Deletion of a CMK
- Canceling the Scheduled Deletion of a CMK
- Querying the List of CMKs
- Querying the Information About a CMK
- Creating a Random Number
- Creating a DEK
- Creating a Plaintext-Free DEK
- Encrypting a DEK
- Decrypting a DEK
- Querying the Number of Instances
- Querying the Quota of a User
- Changing the Alias of a CMK
- Changing the Description of a CMK
- Creating a Grant
- Revoking a Grant
- Retiring a Grant
- Querying Grants on a CMK
- Querying Grants That Can Be Retired
- Encrypting Data
- Decrypting Data
- Obtaining CMK Import Parameters
- Importing CMK Material
- Deleting CMK Material
- Enabling Rotation for a CMK
- Changing the Rotation Interval for a CMK
- Disabling Rotation for a CMK
- Querying the Rotation Status of a CMK
- Appendix
- Change History
-
API Reference (Kuala Lumpur Region)
- Before You Start
- Calling APIs
- API Overview
-
APIs
- Creating a CMK
- Enabling a CMK
- Disabling a CMK
- Scheduling the Deletion of a CMK
- Canceling the Scheduled Deletion of a CMK
- Querying the List of CMKs
- Querying the Information About a CMK
- Creating a Random Number
- Creating a DEK
- Creating a Plaintext-Free DEK
- Encrypting a DEK
- Decrypting a DEK
- Querying the Number of Instances
- Querying the Quota of a User
- Changing the Alias of a CMK
- Changing the Description of a CMK
- Creating a Grant
- Revoking a Grant
- Retiring a Grant
- Querying Grants on a CMK
- Querying Grants That Can Be Retired
- Encrypting Data
- Decrypting Data
- Obtaining CMK Import Parameters
- Importing CMK Material
- Deleting CMK Material
- Enabling Rotation for a CMK
- Changing the Rotation Interval for a CMK
- Disabling Rotation for a CMK
- Querying the Rotation Status of a CMK
- Appendix
- Change History
- General Reference
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Application Scenarios
Prerequisites
All the custom keys mentioned in this section are symmetric keys. For details about symmetric keys and asymmetric keys, see Keys Types.
Small Data Encryption and Decryption
You can use the online tool on the KMS console or call KMS APIs to directly encrypt or decrypt a small amount of data, such as passwords, certificates, or phone numbers. Currently, a maximum of 4 KB of data can be encrypted or decrypted in this way.
Figure 1 shows an example about how to call the APIs to encrypt and decrypt an HTTPS certificate.
- Create a CMK on KMS.
- Call the encrypt-data API of KMS and use the CMK to encrypt the plaintext certificate.
- Deploy the certificate onto a server.
- The server calls the decrypt-data API of KMS to decrypt the ciphertext certificate.
Large Data Encryption and Decryption
If you want to encrypt or decrypt large volumes of data, such as pictures, videos, and database files, you can use the envelope encryption method, where the data does not need to be transferred over the network.
- Figure 2 illustrates the process for encrypting a local file.
The procedure is as follows:
- Create a CMK on KMS.
- Call the create-datakey API of KMS to create a DEK. Then you get a plaintext DEK and a ciphertext DEK. The ciphertext DEK was generated by using a custom key to encrypt the plaintext DEK.
- Use the plaintext DEK to encrypt the file. A ciphertext file is generated.
- Save the ciphertext DEK and the ciphertext file together in a persistent storage device or a storage service.
- Figure 3 illustrates the process for decrypting a local file.
The procedure is as follows:
- Obtain the ciphertext DEK and file from the persistent storage device or the storage service.
- Call the decrypt-datakey API of KMS and use the corresponding CMK (the one used for encrypting the DEK) to decrypt the ciphertext DEK. Then you get the plaintext DEK.
If the CMK is deleted, the decryption fails. Therefore, properly keep your CMKs.
- Use the plaintext DEK to decrypt the ciphertext file.
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