This topic describes the steps to create a signed request. This means that you must generate a key pair that is used to verify your signature.

Summary of steps

To create a signed request, you must complete the following steps.

  1. Configure an API key in nOps through the nOps app.

  2. Create a public/private key pair. Configure nOps with the public key to validate the signature.

  3. Compose your request.

Create a public/private key pair.

Create a key in the nOps application.

  1. Log into the nOps console and from the Settings pane click the API Key option

  2. Click on Let’s Generate Your API Key

  3. You will see a confirmation dialog that contains your newly generated key.

  4. Click the copy button on the right of the key, and save the key.
    You must download a copy of the key when it is generated as you will not be able to access it again.

  5. Click Okay.

Next you will generate a PEM certificate and extract the public key.

Create a Signature Verification Key pair

The following instructions are for Unix-based OS machines. For Windows platforms/OS we suggest using either OpenSSL or PuTTYgen.

Begin by opening a command window.

  1. Generate a PEM Certificate using the following command:
    $ openssl genpkey -out rsakey.pem -algorithm RSA -pkeyopt rsa_keygen_bits:1024

  2. Extract a public key from the PEM certificate by using the following command.
    $ openssl rsa -in privkey.pem -pubout >

  3. Copy and paste this information into the nOps API Key Signature Verification field.

  4. Click Save.
    You now have a fully configured API Client and can use this key when you send a request to nOps.

Compose your request

Once you have the key, you can compose a signature string and sign it and send your request.

Signing your Request

The format for the signature is:

The information for the signature request contains the following:

  • client_id: The Client ID is contained in the first part of API_Key that is returned.
    In this example key: api_key=123.aaaa4432454ccccb5a2280e755fdzzzz
    the api_key is 123

  • date_str: Use the yyyy-MM-dd format, such as 2022-11-07

  • url: Use a request url that does not include the domain name. Ensure that the url contains a trailing slash (/) or the signature will not be verified, and your request will fail. The signature must match exactly before it can be verified.

  • API key: Use the format ?api_key=xxx

For example:


The example signature shown above can only be used:

on the date: 2022-01-10
for the API URL of: /nops_api/v1/billingGetTotal/
for the client (123) indicated within the api_key request:

The signature must match exactly for the signature to be verified.

To sign and encode your signature string using your private key.

Following is an example of how to create a key pair using Python instead of the prior instructions to create a key pair. However, in order to use the Python script you may first need to install pycryptodomex by using this command:

pip install pycryptodomex

import binascii 
from Cryptodome.Hash import SHA256
from Cryptodome.PublicKey import RSA
from Cryptodome.Signature import pkcs1_15

key = RSA.generate(1024)
encrypt_key = key.export_key(pkcs=8)
public_key = key.publickey().export_key().decode()

message = "123.2022-01-10./nops_api/v1/billingGetTotal/?api_key=123.aaaa4432454ccccb5a2280e755fdzzzz"
encoded_string = message.encode()
byte_array= bytearray(encoded_string)
sha_bytes =
signature =
signature = binascii.b2a_base64(signature)[:-1].decode("utf-8")

To send an API request

Include the encoded signature in the x-nops-signature header.

API requests should use the following format. <enter_REST-URI>?api_key=<Client_key>

<enter_REST-URI> is the location of the endpoint for example: /c/admin/projectaws/

<Client_key> is the API key you generated within nOps in the Create a public/private key pair procedure earlier in this document.

See also:

nOps Public API documentation

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