Cloudimage - Documentation

URL signature

To prevent URL tampering and protect your token, every Cloudimage URL can be secured with an SHA-1 HMAC signature.

The signature is calculated as follows:

Signature = sha1('Salt' + 'Query String') where Query String = /operation/size/filters/original_image_url

The syntax to process an image is:


Because the Salt is a shared secret between you and Cloudimage, only you will be able to calculate the signature of your images.

Contact us to enable the signature and set up the Salt for your company token.