Certificate Management Service:DescribeCertificatePrivateKey

Usage notes

You can call the DescribeCertificatePrivateKey operation to obtain the encrypted private key of a client certificate or a server certificate. The certificate is issued based on a system-generated certificate signing request (CSR). Before you call this operation, make sure that you have issued a client certificate or a server certificate by calling the following operation:

• CreateClientCertificate
• CreateServerCertificate

To ensure the security of private key transmission, the DescribeCertificatePrivateKey operation encrypts the private key by using the private key password that you specify and returns the encrypted private key. The private key password is a string that is used to encrypt the private key. After you obtain the encrypted private key of the certificate, you can use the following methods to decrypt the private key:

• If the encryption algorithm of the certificate is RSA, you must run the openssl rsa -in <Encrypted private key file> -passin pass:<Private key password> -out <Decrypted private key file> command in the computer on which OpenSSL or BabaSSL is installed.
• If the encryption algorithm of the certificate is ECC, you must run the openssl ec -in <Encrypted private key file> -passin pass:<Private key password> -out <Decrypted private key file> command in the computer on which OpenSSL or BabaSSL is installed.
• If the encryption algorithm of the certificate is SM2, you must run the openssl ec -in <Encrypted private key file> -passin pass:<Private key password> -out <Decrypted private key file> command in the computer on which BabaSSL is installed.

Limits

You can call this operation up to 100 times per second per account. If the number of the calls per second exceeds the limit, throttling is triggered. As a result, your business may be affected. We recommend that you take note of the limit when you call this operation.