update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/reference/apis/Readme-EN.md

@@ -125,6 +125,8 @@
 - Security
   - [@ohos.abilityAccessCtrl](js-apis-abilityAccessCtrl.md)
   - [@ohos.privacyManager](js-apis-privacyManager.md)
+  - [@ohos.security.cert](js-apis-cert.md)
+  - [@ohos.security.cryptoFramework]js-apis-cryptoFramework.md)
   - [@ohos.security.huks ](js-apis-huks.md)
   - [@ohos.userIAM.faceAuth](js-apis-useriam-faceauth.md)
   - [@ohos.userIAM.userAuth ](js-apis-useriam-userauth.md)

en/application-dev/reference/errorcodes/errorcode-cert.md

+#  Certificate Error Codes
+
+## 19020001 Memory Error
+
+**Error Message**
+
+Memory error.
+
+**Possible Causes**
+
+The memory allocation failed.
+
+**Solution**
+
+1. Check whether the system is running properly.
+2. Check whether the service data is too long. 
+
+## 19020002 Runtime Error
+
+**Error Message**
+
+Runtime error.
+
+**Possible Causes**
+
+An unexpected error occurs.
+
+**Solution**
+
+Check whether the system is running properly.
+
+## 19030001 Crypto Operation Error
+
+**Error Message**
+
+Crypto operation error.
+
+**Possible Causes**
+
+An error occurs when the cryptography framework interacts with a third-party algorithm library.
+
+**Solution**
+
+1. Check whether the input parameters are correct.
+2. Check whether the third-party algorithm library functions properly.
+
+## 19030002 Certificate Signature Verification Failed
+
+**Error Message**
+
+The certificate signature verification failed.
+
+**Possible Causes**
+
+Incorrect certificate signature information is found during the signature verification.
+
+**Solution**
+
+Check whether the certificate is correct.
+
+## 19030003 Certificate Has Not Taken Effect
+
+**Error Message**
+
+The certificate has not taken effect.
+
+**Possible Causes**
+
+The certificate has not taken effect. The effective time of the certificate is later than the current system time or the time specified by the service.
+
+**Solution**
+
+1. Check whether the certificate is correct.
+2. Check whether the system time is correct.
+3. Compare the certificate effective time with the current system time to determine whether the certificate has taken effect.
+
+## 19030004 Certificate Expired
+
+**Error Message**
+
+The certificate has expired.
+
+**Possible Causes**
+
+The certificate has expired. The certificate expiration time is earlier than the current system time or the time specified by the service.
+
+**Solution**
+
+1. Check whether the certificate is correct.
+2. Check whether the system time is correct.
+3. Compare the certificate expiration time time with the current system time to determine whether the certificate has expired.
+
+## 19030005 Failed to Obtain the Certificate Issuer
+
+**Error Message**
+
+Failed to obtain the certificate issuer.
+
+**Possible Causes**
+
+The certificate issuer cannot be obtained during certificate verification.
+
+**Solution**
+
+Check whether the certificate is correct.
+
+## 19030006 Key Cannot be Used for Signing a Certificate
+
+**Error Message**
+
+The key cannot be used for signing a certificate.
+
+**Possible Causes**
+
+The key cannot be used to sign certificates.
+
+**Solution**
+
+Check whether the certificate is correct.
+
+## 19030007 Key Cannot be Used for Digital Signature
+
+**Error Message**
+
+The key cannot be used for digital signature.
+
+**Possible Causes**
+
+The key cannot be used for digital signature.
+
+**Solution**
+
+Check whether the certificate is correct.

en/application-dev/reference/errorcodes/errorcode-crypto-framework.md

+#  Crypto Framework Error Codes
+
+## 17620001 Memory Error
+
+**Error Message**
+
+Memory error.
+
+**Possible Causes**
+
+The memory allocation failed.
+
+**Solution**
+
+1. Check whether the system is running properly.
+2. Check whether the service data is too long. 
+
+## 17620002 Runtime Error
+
+**Error Message**
+
+Runtime error.
+
+**Possible Causes**
+
+An unexpected error occurs.
+
+**Solution**
+
+Check whether the system is running properly.
+
+## 19030001 Crypto Operation Error
+
+**Error Message**
+
+Crypto operation error.
+
+**Possible Causes**
+
+An error occurs when the cryptography framework interacts with a third-party algorithm library.
+
+**Solution**
+
+1. Check whether the input parameters are correct.
+2. Check whether the third-party algorithm library functions properly.

en/application-dev/security/Readme-EN.md

@@ -11,6 +11,12 @@
 - Key Management
   - [HUKS Overview](huks-overview.md)
   - [HUKS Development](huks-guidelines.md)
+- Crypto Framework
+  - [Crypto Framework Overview](cryptoFramework-overview.md)
+  - [Crypto Framework Development](cryptoFramework-guidelines.md)
+- Certificate
+  - [Certificate Overview](cert-overview.md)
+  - [Certificate Development](cert-guidelines.md)
 - hapsigner  
   - [hapsigner Overview](hapsigntool-overview.md)
   - [hapsigner Guide](hapsigntool-guidelines.md)

en/application-dev/security/cert-overview.md

+# Certificate Overview
+The **Certificate** module provides APIs for X.509 certificate operations. You can use the APIs to implement quick development.
+
+## Basic Concepts
+
+A digital certificate provides a method of digitally verifying the identity of a user, device, or service. X.509 is an international standard format public key certificates that securely associate cryptographic key pairs with identifies such as websites, individuals, or organizations. The crypto framework provides the following capabilities:
+
+- X.509 certificate capabilities: parsing and serializing X.509 certificates, verifying X.509 certificate signatures, and querying certificate information.
+- X.509 certificate revocation list (CRL) capabilities: parsing, serializing, and querying the X.509 CRL.
+- Certificate chain validator capabilities: verifying the certificate chain (excluding the certificate validity period) and querying certificate chain algorithms.
+
+## Constraints
+
+- Multi-thread concurrent operations are not supported.
+
+### Certificate Specifications
+
+- Certificate chain verification
+
+  The certificate chain validator does not verify the certificate validity period because the system time on the device is untrusted. To check the validity period of a certificate, use **checkValidityWithDate()** of the **X509Cert** class.
+
+- Certificate formats
+  
+  Currently, only the certificates in DER and PEM formats are supported.